CWD Series
Gas-Fired Direct Vent Hot Water Boilers
INSTALLATION INSTRUCTIONS
These instructions must be affixed on or adjacent to the boiler
Models:
• CWD060
WARNING: Improper installation,
adjustment, alteration, service or
maintenance can cause property
damage, injury, or loss of life. For
assistance or additional information,
consult a qualified installer, service
agency or the gas supplier. Read
these instructions carefully before
installing.
• CWD083
• CWD110
• CWD138
• CWD165
• CWD193
• CWD220
• CWD245
Manufacturer of Hydronic Heating Products
P.O. Box 14818 3633 I. Street
Philadelphia, PA 19134
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I Product Description
The CWD series boiler is a cast iron gas fired boiler designed for use in forced hot water heating systems. It is is a low
pressure boiler intended for use in closed heating systems with water temperatures under 240F. This boiler may be vented either
vertically or horizontally with combustion air supplied from either outdoors or (under certain conditions) indoors. It is ideal for
use in installations where a reliable source of clean indoor combustion air cannot be guaranteed.
II Specifications
FIGURE 1: GENERAL CONFIGURATION
TABLE 1: SPECIFICATIONS
WATER
INPUT
(MBH)
DOE HTG.
CAPY (MBH)
I=B=R NET
RATING (MBH)
AFUE
(%)
FIG 1
VENT
CONTENT
(Gal.)
MODEL
SECTIONS
DIM. “A” (in.) DIA. (in.)
CWD060
3
60
51
71
94
44
62
82
85.1
85.1
85.2
16-1/8
19-3/4
23-3/8
3
3
3
2.0
2.6
3.1
CWD083
CWD110
4
5
82.5
110
CWD138
CWD165
CWD193
CWD220
6
7
8
9
137.5
165
118
142
165
189
103
123
143
164
85.2
85.2
85.2
85.2
27
3
3.6
4.2
4.7
5.2
30-5/8
34-1/8
37-3/4
3 OR 4
3 OR 4
3 OR 4
192.5
220
CWD245
10
245
211
183
85.3
41-3/8
3 OR 4
5.8
1
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III Before Installing
1) Safe, reliable operation of this boiler depends upon installation by a professional heating contractor in strict accordance
with this manual and the authority having jurisdiction.
• In the absence of an authority having jurisdiction, installation must be in accordance with this manual and the National
Fuel Gas Code, ANSI Z223.1.
• Where required by the authority having jurisdiction, this installation must conform to the Standard for Controls and
Safety Devices for Automatically Fired Boilers (ANSI/ASME CSD-1).
2) Read Section VI to verify that the maximum combustion air and exhaust pipe lengths will not be exceeded in the planned
installation. Also verify that the vent terminal can be located in accordance with Section VI.
3) Make sure that the boiler is correctly sized:
• For heating systems employing convection radiation (baseboard or radiators), use an industry accepted sizing method
such as the I=B=R Heat Loss Calculation Guide (Pub. #H21 or #H22) published by the Hydronics Institute in Berkely
Heights, NJ.
• For new radiant heating systems, refer to the radiant tubing manufacturer’s boiler sizing guidelines.
• For systems including a Crown Mega-Stor indirect water heater, size the boiler to have either the DOE Heating Capacity
required for the Mega-Stor or the net rating required for the heating system, whichever results in the larger boiler.
• For systems that incorporate other indirect water heaters, refer to the indirect water heater manufacturer’s instructions for
boiler output requirements.
4) Make sure that the boiler received is configured for the correct gas (natural or LP).
5) This boiler is not designed for use with return temperatures under 120F for a sustained period of time. Some systems, such
as those having large water contents, may require a return water bypass or other special provisions to protect the boiler
against low return temperatures. Failure to provide such provisions if needed could result in severe corrosion damage to the
boiler. For more information on when low water temperatures protection is required, and appropriate protection, see Part
VIII.
6) For installations at altitudes above 2000ft, special orifice and pressure switches are required. Make sure that the boiler is
configured for use at the correct altitude.
NOTICE
This product must be installed by a licensed plumber or gas fitter when installed within the Commonwealth of Massachusetts.
See Appendix A for additional important information about installing this product within the Commonwealth of Massachusetts.
IV Locating the Boiler
1) Boiler clearances are shown in Figure 2. Figure 2a shows clearances from the boiler when outdoor combustion air is
used. Figure 2b shows clearances from the boiler when combustion air is obtained from the boiler room. These minimum
clearances apply to all types of combustible construction as well as noncombustible walls, ceilings and doors. At least 24”
must be provided for servicing at the front of the boiler. This front clearance may be provided through a door, such as a
closet door. Boiler will be much easier to service if at least 12” is provided from the sides and rear of the boiler to walls.
2) Clearances from venting to combustible material depends upon the type of venting, whether the vent pipe is enclosed, and
whether the venting is vertical or horizontal. See Table 2 for vent clearance information.
3) Boiler may be installed on a non-carpeted combustible surface.
4) The relief valve must not be moved from the location shown in Figure 1.
5) When combustion air is obtained from the boiler room, a 10” clearance is required from the side of the boiler having the air
inlet collar to combustible or non-combustible obstruction (Figure 2b).
6) The boiler should be located so as to minimize the length of the vent system.
7) Do not install this boiler in a location where gasoline or other flammable vapors or liquids will be stored or used. Do
not install this boiler in an area where large amounts of airborne dust will be present, such as a workshop. When indoor
combustion air is used, do not install in a location where sources of hydrocarbons will be stored or used. Some common
sources of hydrocarbons include bleaches, fabric softeners, paints, cleaners, refrigerants, and cat boxes. Traces of these
substances can be drawn into the boiler causing severe corrosion damage to the boiler and /or objectionable odors.
2
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FIGURE 2a: CLEARANCES WHEN BOILER IS DIRECT VENTED (OUTDOOR COMBUSTION AIR IS USED)
FIGURE 2b: CLEARANCES WHEN COMBUSTION AIR IS OBTAINED FROM BOILER ROOM
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TABLE 2: CLEARANCES FROM VENT PIPING TO COMBUSTIBLE CONSTRUCTION
MINIMUM CLEARANCE
TO COMBUSTIBLE
MATERIAL
TYPE OF VENT PIPE
PIPE DIRECTION
ENCLOSURE
HEAT FAB SAF-T VENT
PROTECH FASNSEAL
PROTECH FASNSEAL W2
METAL-FAB CORR/GUARD
AT LEAST ONE SIDE OPEN,
COMBUSTIBLE MATERIAL ON A
MAXIMUM OF THREE SIDES
VERTICAL OR
HORIZONTAL
1”
HEAT FAB SAF-T VENT
PROTECH FASNSEAL
Z-FLEX Z-VENT III
HORIZONTAL OR VERTICAL
WITH OFFSETS
8”
6”
ENCLOSED ON ALL FOUR SIDES
METAL-FAB CORR/GUARD
HEAT FAB SAF-T VENT
PROTECH FASNSEAL
Z-FLEX Z-VENT III
VERTICAL WITH NO OFFSETS
ENCLOSED ON ALL FOUR SIDES
ENCLOSED ON ALL FOUR SIDES
METAL-FAB CORR/GUARD
PROTECH FASNSEAL W2
VERTICAL OR HORIZONTAL
VERTICAL OR HORIZONTAL
3”
0”
UNENCLOSED OR ENCLOSED ON
ALL SIDES
HEAT FAB SAF-T VENT SC
REFER TO “B” VENT
MANUFACTURER’S
INSTRUCTIONS
“B” VENT CHASE USED AS PART OF
CROWN COAXIAL VENT SYSTEM*
PER “B” VENT MANFACTUER’S
INSTRUCTIONS
VERTICAL
* “B” Vent is used as a chase to carry combustion air in this system - never attempt to vent a CWD boiler using “B” vent
V Air for Combustion and Ventilation
Sufficient fresh air must be supplied for both combustion and ventilation. In general, combustion air is obtained in one of
two ways:
• Direct Vent Installations – Combustion air is piped directly to the boiler inlet collar from the outdoors. This is also
sometimes called a “sealed combustion” installation.
• Direct Exhaust Installations – Combustion air is obtained from the boiler room. In some cases, openings or duct work
may be run from the outdoors to the boiler room, however the ducting is not connected directly to the boiler.
Air for ventilation is required to keep various boiler components from overheating and is always obtained from indoors. To
ensure an adequate combustion and ventilation air supply, perform the following steps:
Step 1: Determine whether the boiler is to be installed in a building of unusually tight construction
A good definition of “unusually tight construction” is construction having all of the following features:
• Walls and ceilings exposed to outside atmosphere have a continuous water vapor retarder with a rating of 1 perm or less
with openings gasketed and sealed.
• Weather stripping has been added on openable windows and doors.
• Caulking and sealants are applied to areas such as joints around window and door frames, between sole plates and floors,
between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other
openings.
4
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Step 2: Determine whether the boiler is to be installed in a confined space
A confined space is defined by the National Fuel Gas Code as having a volume less than 50 cubic feet per 1000 BTU/hr
input of all appliances installed in that space. To determine whether the boiler room is a confined space:
1) Total the input of all appliances in the boiler room in thousands of BTU/hr. Round the result to the next highest 1000 BTU/
hr.
2) Find the volume of the room in cubic feet. The volume of the room in cubic feet is:
Length (ft) x width (ft) x ceiling height (ft)
In calculating the volume of the boiler room, consider the volume of adjoining spaces only if no doors are installed between
them. If doors are installed between the boiler room and an adjoining space, do not consider the volume of the adjoining
space, even if the door is normally left open.
3) Divide the volume of the boiler room by the input in thousands of BTU/hr. If the result is less than 50, the boiler room is a
confined space.
Example:
A CWD245 and a water heater are to be installed in a room measuring 6ft – 3 in x 7ft with an 8 ft ceiling. The water heater
has an input of 30000 BTU/hr:
Total input in thousands of BTU/hr = (245000 BTU/hr + 30000 BTU/hr) / 1000 = 275
Volume of room = 6.25 ft x 7 ft x 8 ft = 350 ft3
350/275 = 1.27. Since 1.27 is less than 50, the boiler room is a confined space.
Step 3: Decide whether the boiler will be direct vented or direct exhausted
The boiler must be direct vented (combustion air piped directly to the boiler) if:
• The boiler is to be installed in a laundry room
• The building in which the boiler is installed has an indoor pool.
• The boiler is located in an area having any of the contaminants described in Section IV.
It is also strongly recommended that combustion air be piped from outside when the boiler is installed in a building of
unusually tight construction.
Step 4: If the boiler is Direct Vented, Provide Air as Follows (If Indoor Combustion Air is used,
Skip to Step 5):
1) Combustion air piping must not exceed the maximum lengths called for in Section VI.
2) Although combustion air is obtained directly from outdoors, openings may be required into the boiler room to allow for
adequate equipment ventilation. The following guidelines apply regardless of whether or not the building is of unusually
tight construction:
Unconfined Space– Natural infiltration into the boiler room will provide adequate air for ventilation without additional
openings into boiler room.
Confined Space – Provide two openings into the boiler room, one near the floor and one near the ceiling. The top edge of
the upper opening must be within 12” of the ceiling and the bottom edge of the lower opening must be within 12” of the
floor (Fig 3). The minimum opening dimension is 3 inches.
• If the CWD boiler is the only gas-burning appliance in the boiler room, these openings must each have a free area of 100
square inches.
• If other gas-burning appliances are in the boiler room, size the openings in accordance with the appliance manufacturer’s
instructions or the National Fuel Gas Code. Minimum opening free area is 100 square inches regardless of opening
requirements for other appliances.
• If the total volume of both the boiler room and the room to which the openings connect is less than 50 cubic feet per 1000
BTU/hr of total appliance input, install a pair of identical openings into a third room. Connect additional rooms with
openings until the total volume of all rooms is at least 50 cubic feet per 1000 BTU/hr of input.
• The “free area” of an opening takes into account the blocking effect of mesh, grills, and louvers. Where screens are used,
they must be no finer than ¼” (4 x 4) mesh.
5
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Step 5: If Indoor Combustion Air is Used, Provide Air as Follows:
1) Buildings of other than unusually tight construction:
Unconfined Space– Natural infiltration into the boiler room will normally provide adequate air for combustion and
ventilation without additional louvers or openings into boiler room.
Confined Space – Provide two openings into the boiler room, one near the floor and one near the ceiling. The top edge of
the upper opening must be within 12” of the ceiling and the bottom edge of the lower opening must be within 12” of the
floor (Fig 3).
• Each opening must have a free area of 1 square inch per 1000 BTU/hr input of all gas burning appliances in the boiler
room. The minimum opening dimension is 3 inches. Minimum opening free area is 100 square inches per opening.
• If the total volume of both the boiler room and the room to which the openings connect is less than 50 cubic feet per 1000
BTU/hr of total appliance input, install a pair of identical openings into a third room. Connect additional rooms with
openings until the total volume of all rooms is at least 50 cubic feet per 1000 BTU/hr of input.
• The “free area” of an opening takes into account the blocking effect of mesh, grills, and louvers. Where screens are used,
they must be no finer than ¼” (4 x 4) mesh.
2) Buildings of unusually tight construction:
If at all possible, direct vent the boiler. Where the boiler must be installed in unusually tight construction and cannot be
direct vented, openings must be installed between the boiler room and the outdoors or a ventilated space, such as an attic
or crawl space, which communicates directly with the outdoors. Two openings are required. The top edge of the upper
opening must be within 12 inches of the ceiling. The bottom edge of the lower opening must be within 12 inches of the
floor. Size openings and ducts as follows:
• Vertical ducts or openings directly outdoors (Fig 4, Fig 5, Fig 6) – Each opening must have a free cross sectional area of
1 square inch per 4000 BTU/hr of the total input of all gas-fired appliances in the boiler room but not less than 100 square
inches. Minimum opening size is 3 inches.
• Openings to outdoors via horizontal ducts (Fig 7) - Each opening must have a free cross sectional area of 1 square inch
per 2000 BTU/hr of the total input of all gas fired appliances in the boiler room but not less than 100 square inches.
Minimum opening size is 3 inches.
• The “free area” of an opening takes into account the blocking effect of mesh, grills, and louvers. Where screens are used,
they must be no finer than ¼” (4 x 4) mesh.
FIGURE 3: BOILER INSTALLED IN A CONFINED SPACE - VENTILATION OR
COMBUSTION / VENTILATION AIR FROM INSIDE
6
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FIGURE 4: ALLAIR FROM OUTSIDE USING VENTILATED CRAWL SPACE AND ATTIC
FIGURE 5: ALLAIR FROM OUTSIDE USING VENTILATED ATTIC
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FIGURE 6: ALLAIR FROM OUTSIDE USING OPENINGS INTO BOILER ROOM
FIGURE 7: ALLAIR FROM OUTSIDE USING HORIZONTAL DUCTS INTO BOILER ROOM
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VI Venting
WARNING
Failure to vent this boiler in accordance with these instructions could result in unreliable boiler
operation, severe damage to the boiler or property, or unsafe operation:
* Do not attampt to vent this boiler with galvanized, PVC, or any other vent system not listed in Table 4.
* Do not attempt to mix components from different approved vent systems.
* Do not install a barometric damper or drafthood on this boiler.
* Do not attempt to use the vent system for this boiler with any other appliance.
* Moisture and ice may form on the surfaces around the vent termination. To prevent deterioration,
surfaces should be in good repair (sealed, painted, etc.)
A. Vent System Design
There are three basic ways to vent the CWD boiler:
• Horizontal (“side wall”) Venting - Vent system exits the building through an outside wall. Combustion air is either
obtained through a separate pipe from outside (a “direct vent” installation) or obtained from the boiler room (a “direct
exhaust” installation).
• Vertical Non-Coaxial Venting - Vent system exits the building through a roof. Combustion air is either obtained
through a separate pipe from outside (a “direct vent” installation) or obtained from the boiler room (a “direct exhaust”
installation).
• Vertical Coaxial Venting - Vent system exits the building through a roof. A portion of the vent system is coaxial, meaning
that it consists of a “pipe within a pipe”. Flue gasses exit the building through the inner pipe and combustion air is drawn
through the space between the two pipes.
For each of the above three basic methods, there are several variations, resulting in a total of 13 options for venting
the CWD boiler. A description of each of these venting options is listed in Tables 3a - 3c. For clarity, these vent options are
numbered from 1 to 13 in Table 3. One of the vent option columns in Table 3 must match the planned vent and air intake
system exactly. In addition, observe the following guidelines:
1) Approved vent systems - Use only one of the approved vent systems shown in Table 4. These systems are made of a special
stainless steel alloy (AL29-4C) for protection against corrosive flue gas condensate. They are also designed to provide a gas
tight seal at all joints and seams so that flue gas does not enter the building. Each approved vent system has unique method
for installation - do not attempt to mix components from different vent systems. The only exceptions are:
• Heat Fab Saf-T Vent SC may be combined with Saf-T Vent EZ Seal.
• Protech FasNSeal W2 may be combined with Protech FasNSeal.
See the vent installation section of this manual for information on how this can be done.
Heat Fab Saf-T Vent SC is a double wall vent system which can be used in two ways on CWD installations. In vertical
coaxial vent systems (Vent Options 12 and 13), the space between the inner and outer pipes is used as a conduit to bring
combustion air to the boiler. In Horizontal (Vent Options 1 to 5) and Vertical (Option 6 to 10) vent systems, Saf-T Vent SC
can be used to obtain a 0” clearance to combustible construction. When this is done, the space between the inner and outer
pipes is used for ventilation, but boiler combustion air comes from elsewhere.
Protech FasNSeal W2 is also a double wall vent system. In some cases, it can used to obtain closer clearances to
combustible construction than are possible using Protech FasNSeal (see Table 2). The space between the inner and outer
pipes on FasNSeal W2 cannot be used as a combustion air conduit.
The Crown Vertical coaxial vent system (Vent Option 11) is similar to that constructed using Heat Fab Saf-T Vent SC
except it is constructed by running one of the 3” single wall vent systems shown in Table 4 inside 5” type “B” vent. The
space between the 3” vent and the “B” vent forms a conduit to bring combustion air to the boiler. The advantage of this
system is that it can be constructed using any of the vent systems shown in Table 4 except for Heat Fab Saf-T Vent SC and
Protech FasNSeal W2. No turns are permitted in the coaxial section of this system.
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TABLE 3a: SUMMARY OF HORIZONTAL VENTING OPTIONS
VENT OPTION #
1
2
3
4
5
(RESERVED
FOR FUTURE
USE)
HORIZONTAL
DIRECT
EXHAUST
HORIZONTAL
DIRECT
EXHAUST
CLASSIFICATION USED IN THIS
MANUAL
HORIZONTAL
DIRECT VENT
HORIZONTAL
DIRECT VENT
ILLUSTRATED IN FIGURE
8a OR 8b
WALL
8a OR 8b
WALL
9
9
VENT PIPE STRUCTURE
PENETRATION
WALL
N.A.
WALL
N.A.
AIR INTAKE PIPE STRUCTURE
PENETRATION
WALL
WALL
VENT PIPE SIZE
3”
4”
4”
4”
3”
4”
AIR INTAKE PIPE SIZE
CWD060 - CWD138
N.A.
55 FT
N.A.
55 FT
55 FT
55 FT
CWD165
CWD193
CWD220
CWD245
35 FT
25 FT
15 FT
N.R.
55 FT
55 FT
55 FT
35 FT
25 FT
15 FT
55 FT
55 FT
55 FT
55FT
60 FT
60 FT
60 FT
60 FT
60 FT
10 FT
N.A.
N.A.
N.A.
N.A.
N.A.
55 FT
N.A.
N.A.
N.A.
N.A.
N.A.
CWD060 - CWD138
CWD165
60 FT
40 FT
30 FT
20 FT
N.R.
CWD193
CWD220
CWD245
3” 90 ELBOW,
TEE, OR
4” 90 ELBOW,
TEE, OR
CROWN
CROWN
3” 90 ELBOW
OR TEE
4” 90 ELBOW
OR TEE
EXHAUST TERMINAL
AIR INTAKE TERMINAL
COAXIAL
TERMINAL
#50-003
COAXIAL
TERMINAL
#50-004
4” 90 ELBOW
OR CROWN
COAXIAL
TERMINAL
#50-003
4” 90 ELBOW
OR CROWN
COAXIAL
TERMINAL
#50-004
N.A.
N.A.
N.A.
VENT MATERIAL
APPROVED VENT SYSTEM SHOWN IN TABLE 4
GALVANIZED OR PVC N.A.
AIR INTAKE MATERIAL
“N.R” - Not recommended “N.A.” - Not applicable
10
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FIGURE 8a: HORIZONTAL DIRECT VENTING USING SEPARATE TERMINALS (VENT OPTIONS 1-2)
FIGURE 8b: HORIZONTAL DIRECT VENTING USING COAXIAL TERMINAL (VENT OPTIONS 1-2)
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FIGURE 9: HORIZONTAL DIRECT EXHAUST VENT SYSTEM (VENT OPTIONS 4,5)
2) Maximum Vent and Air Intake Lengths - The maximum length of the vent air intake piping depends upon the vent option
selected, the vent pipe size, and the boiler size. See Table 3 for the maximum vent length. In addition to the maximum
length of piping shown in Table 3, the following fittings may also be used:
• Horizontal Vent Systems: One 90 deg. elbow
• Vertical Vent Systems: Two 90 deg. elbows
• Vertical Coaxial Vent Systems: Two 90 deg. elbows
• Air Intake Systems: Two 90 deg. elbows
If additional elbows are desired, the maximum allowable vent length must be reduced by the amount shown in Table 5 for
each additional elbow used. Note: Termination fittings do not need to be counted when counting additional elbows.
Example:
A 3” vent system is planned for a horizontal direct vented CWD165 which has the following components:
2 ft vertical pipe
1 90 elbow
5 ft horizontal pipe
1 90 elbow
3 ft horizontal pipe
1 45 elbow
4 ft horizontal pipe
1 termination elbow
The Vent Option #1 column in Table 3a describes a horizontal direct vent system using 3” vent pipe. From this column, we
see that a CWD165 may vent length of up to 35ft. The first 90 elbow and the termination elbow are not considered. From
Table 5, the equivalent length of the 3” 45 elbow is 4ft and the equivalent length of the 3” 90 degree elbow is 5.5ft. The
maximum allowable run of straight pipe on this system is therefore:
35ft – 4 ft – 5.5ft = 25.5ft
Since the planned installation has only 14 ft of straight pipe, the planned vent length is acceptable.
3) Minimum Vent / Exhaust Pipe Length - Minimum vent length is 2ft. Minimum air inlet length is 0ft.
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3) Permitted Terminals for Horizontal Venting (Vent Options 1 - 5) - Table 3a shows permitted types of terminals for both the
vent and air inlet systems. On horizontal direct vent systems using 4” air inlet pipe (Vent Options 1 and 2), the following
Crown co-axial terminals may be used. These terminals have the advantage of requiring only one wall penetration. Part
numbers for the Crown coaxial terminals are as follows:
• 3” Vent - 50-003
• 4” Vent - 50-004
When separate vent and air intake terminals are used, or when the boiler uses indoor combustion air, the vent terminal
is either a tee or an elbow supplied by the vent system manufacturer and equipped with a rodent screen. Vent system
manufacturer’s part numbers for these fittings are shown in Table 4. In some cases, the elbows and tees shown in Table 4
require separate adaptors and/or rodent screens. When this is the case, vent manufacturer part numbers for these additional
parts are shown in Table 4 along with the termination fitting.
When Heat Fab Saf-T Vent SC is used, the Heat Fab 5300CI or 5400CI fitting is used between the last piece of Saf-T
Vent CI and the terminal. These fittings physically adapt from the CI pipe to the terminal and also provide ventilation
openings which must remain open for the Saf-T Vent CI to maintain its clearance rating.
Except when the Crown 50-003 or 50-004 coaxial terminals are used, the air intake fitting on a horizontal direct vent
system (Options 1 - 2) is always a 90 degree elbow with a rodent screen. This elbow is made out of the same material as the
rest of the air inlet system (either galvanized or PVC) and is installed as shown in Figure 8a.
4) Horizontal vent terminal location - Observe the following limitations on the vent terminal location (also see Fig 15a - d):
• Direct exhaust installations (installations using indoor combustion air) - Exhaust terminal must be at least 4 feet below or
4 feet horizontally from any window, door, or gravity air inlet into the building.
• Direct vent installations – Exhaust elbow or coaxial terminal must be at least 1 foot from any door, window, or gravity
inlet into the building.
• Direct vent installations using termination elbows – Maintain the correct clearance and orientation between the inlet and
exhaust elbows. The elbows must be at the same level and their center lines must be between 12 and 36 inches apart.
• The bottom of the exhaust elbow, tee, or coaxial terminal must be at least 12” above the normal snow line. In no case
should it be less than 12” above grade level.
• The bottom of the exhaust elbow, tee, or coaxial terminal must be at least 7 feet above a public walkway.
• The bottom of the exhaust elbow, tee, or coaxial terminal must be at least 3 feet above any forced air inlet located within
10 feet.
• A clearance of at least 4 feet horizontally or 4 feet vertically must be maintained between the exhaust terminal and gas
meters, electric meters, regulators, and relief equipment.
• Do not locate the terminal under decks or similar structures.
• Top of exhaust elbow, tee, or coaxial terminal must be at least 4 feet below eves, soffits, or overhangs. Overhang may not
exceed 3 feet (Figure 15d).
• Terminal must be at least 3 feet from an inside corner.
• Under certain conditions, water in the flue gas may condense on the structure in areas around the terminal. If these areas
are made of materials subject to damage by flue gas condensate, they should be protected.
• If possible, install the terminal on a wall away from the prevailing wind. Reliable operation of this boiler cannot be
guaranteed if the terminal is subjected to winds in excess of 40 mph.
• The noise level in the vicinity of the terminal is approximately 65 dB (roughly the level of a normal conversation). Avoid
positioning the terminal in areas where this might be objectionable.
5) Horizontal air intake terminal location - Horizontal air intake terminal must be at least 12” above the normal snow line.
6) Permitted Terminals for Vertical Venting (Vent Options 6 - 10) - Terminals used on these systems are caps. Vent
manufacturer part numbers for these caps are shown in Table 4. When Heat Fab Saf-T Vent SC is used, the 5300CI or
5400CI fitting is used between the highest piece of Saf-T Vent CI and the cap. These fittings physically adapt from the
CI pipe to the cap and also provide ventilation openings which must remain open for the Saf-T Vent CI to maintain its
clearance rating.
Vertical direct vent systems (Vent Options 6 - 8) can have combustion air obtained from either a vertical or horizontal air
intake system. When combustion air is obtained from the roof, the air inlet terminal consists of a 180 degree elbow (or two
90 degree elbows) with a rodent screen as shown in Figure 10. When combustion air is obtained through a horizontal vent
system, the air inlet termination is a 90 degree elbow with a rodent screen as shown in Figure 8a.
7) Permitted terminals for Vertical Coaxial Venting (Options 11 - 13) - When the Crown vertical coaxial vent kit is used (Vent
Option 11), a cap compatible with the vent system is used (Figure 12, Table 4). The concentric air intake hood supplied in
the Crown kit is the air inlet terminal (Figure 12).
When vertical coaxial venting is done using Heat Fab Saf-T Vent SC (Options 12, 13), the vent terminal is a SC03VT or
SC04VT terminal installed with a 5300CI or 5400CI adaptor. The openings in this adaptor are used for combustion air.
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TABLE 3b: SUMMARY OF VERTICAL VENTING OPTIONS
VENT OPTION #
6
7
8
9
10
(RESERVED
FOR FUTURE
USE)
VERTICAL
DIRECT
EXHAUST
VERTICAL
DIRECT
EXHAUST
CLASSIFICATION USED IN THIS
MANUAL
VERTICAL
DIRECT VENT
VERTICAL
DIRECT VENT
ILLUSTRATED IN FIGURE
10
10
11
11
VENT PIPE STRUCTURE
PENETRATION
ROOF
ROOF
ROOF
N.A.
ROOF
N.A.
AIR INTAKE PIPE STRUCTURE
PENETRATION
ROOF OR WALL
ROOF OR WALL
VENT PIPE SIZE
3”
4”
4”
4”
3”
4”
AIR INTAKE PIPE SIZE
CWD060 - CWD138
N.A.
47 FT
N.A.
47 FT
47 FT
47 FT
CWD165
CWD193
CWD220
CWD245
27 FT
17 FT
N.R.
47 FT
47 FT
47 FT
27 FT
17 FT
N.R.
47 FT
47 FT
47 FT
N.R.
47 FT
50 FT
50 FT
50 FT
50 FT
50 FT
N.R.
N.A.
N.A.
N.A.
N.A.
N.A.
47 FT
N.A.
N.A.
N.A.
N.A.
N.A.
CWD060 - CWD138
CWD165
52 FT
32 FT
22 FT
N.R.
CWD193
CWD220
CWD245
N.R.
EXHAUST TERMINAL
BY VENT SYSTEM MANUFACTURER. SAME DIAMETER AS VENT SYSTEM. SEE TABLE 4.
AIR INTAKE TERMINAL
(ROOF PENETRATION)
4” 180 ELBOW
4” 90 ELBOW
4” 180 ELBOW
4” 90 ELBOW
N.A.
N.A.
N.A.
N.A.
AIR INTAKE TERMINAL
(WALL PENETRATION)
VENT MATERIAL
APPROVED VENT SYSTEM SHOWN IN TABLE 4
GALVANIZED OR PVC N.A.
AIR INTAKE MATERIAL
N.A.
“N.R” - Not recommended “N.A.” - Not applicable
8) Vertical Vent Terminal Locations (Vent Options 6 - 13) - Observe the following limitations on the location of all vertical
vent terminals (see Figs. 10, 11, 12, 13):
• The lowest discharge opening on the cap must be at least 2 feet above any object located within 10 feet.
• If outside air is used for combustion (Options 6-7, 11-13), the vertical distance between vent and air inlet terminal
openings must be at least 12”.
• The bottom of the air inlet terminal must be at least 12” above the normal snow accumulation that can be expected on the
roof.
9) Terminal offsets - Horizontal elbow or tee terminals may be offset by as much as 5 ft as shown in Figure 14. This sometimes
helps maintain the 12” minimum clearance required above the snow line. The extra two elbows and the section of vertical
pipe on the outside of the building must be counted when checking that the maximum vent / intake pipe length is not
exceeded. On horizontal direct vent systems, both terminals must be offset by the same amount so that their relationship to
one another is the same as shown in Figure 8a. When this offset is used, the horizontal section of vent pipe must be pitched
away from the outside so that condensate cannot collect in the lower offset elbow.
10) Wall thimbles – Wall thimbles are required where the vent pipe passes through combustible walls with less than the
required clearance shown in Table 2 or as required by local codes. Vent manufacturer’s wall thimble part numbers are
shown in Table 4.
11) Condensate Traps and Pitch of Horizontal piping – All horizontal vent piping must be pitched ¼” per foot so that any
condensate which forms in this piping will run towards either the outdoors or into a condensate trap. Vent manufacturer’s
part numbers for suitable condensate traps are shown in Table 4.
All vertical vent systems must include at least one condensate trap as shown in Figures 10-13. This will collect any
condensate that forms in the vent system as well as any rain water that gets around the vent cap.
The maximum allowable vertical run directly off of the boiler without a condensate trap is 7.5 ft (Figure 16). Install a
condensate trap in longer vertical runs so that condensate which might form in this first vertical section will not run into the
boiler fan.
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FIGURE 10: VERTICAL NON-COAXIAL DIRECT VENT SYSTEM (VENT OPTIONS 6, 7)
FIGURE 11: VERTICAL DIRECT EXHAUST SYSTEM (VENT OPTIONS 9, 10)
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TABLE 3c : SUMMARY OF VERTICAL COAXIAL VENTING OPTIONS
VENT OPTION #
11
12
13
VERTICAL
COAXIAL
DIRECT VENT
VERTICAL
COAXIAL
DIRECT VENT
VERTICAL
COAXIAL
DIRECT VENT
CLASSIFICATION USED IN THIS
MANUAL
VENT PIPE STRUCTURE
PENETRATION
ROOF
ROOF
ROOF
ROOF
ROOF
ROOF
AIR INTAKE PIPE STRUCTURE
PENETRATION
VENT PIPE SIZE
3”
4”
3”
4”
4”
4”
AIR INTAKE PIPE SIZE
(NON-COAXIAL SECTION)
AIR INTAKE PIPE SIZE
(COAXIAL SECTION)
CWD060 - CWD138
5”
5”
7”
47 FT
47 FT
27 FT
N.R.
47 FT
CWD165
CWD193
CWD220
CWD245
27 FT
N.R.
N.R.
N.R.
CONSULT
FACTORY
N.R.
N.R.
30 FT OR AS
LIMITED BY MAX
VENT LENGTH,
WHICHEVER IS
LESS
AS LIMITED
BY MAX VENT
LENGTH
MAXIMUM LENGTH
COAXIAL SECTION
CONSULT
FACTORY
CWD060 - CWD138
CWD165
52 FT
32 FT
N.R.
50 FT
32 FT
N.R.
50 FT
CWD193
CONSULT
FACTORY
CWD220
N.R.
N.R.
CWD245
N.R.
N.R.
BY VENT
SYSTEM
MANUFAC-
HEAT FAB
#SC03RC
HEAT FAB
#SC04RC
EXHAUST TERMINAL
AIR INTAKE TERMINAL
TURER. SAME
DIAMETER AS
VENT SYSTEM.
SEE TABLE 4.
SUPPLIED WITH
CROWN #500005
COAXIAL VENT
KIT
HEAT FAB
#SC03VT
HEAT FAB
#SC04VT
5” “B” VENT
TEE + SUPPORT
SUPPLIED WITH
CROWN #500005
COAXIAL VENT
KIT
ADAPTOR FROM NON-COAXIAL
TO COAXIAL SECTIONS
HEAT FAB
#SC03TAD4
HEAT FAB
#SC04TAD4
APPROVED
VENT SYSTEM
SHOWN IN
TABLE 4
VENT MATERIAL
(NON-COAXIAL SECTION)
HEAT FAB
SAF-T VENT
HEAT FAB
SAF-T VENT
APPROVED
VENT SYSTEM
SHOWN IN
TABLE 4
VENT MATERIAL
(COAXIAL SECTION)
HEAT FAB
SAF-T VENT SC
HEAT FAB
SAF-T VENT SC
AIR INTAKE MATERIAL
(NON-COAXIAL SECTION)
GALVANIZED OR PVC
AIR INTAKE MATERIAL
(COAXIAL SECTION)
5” TYPE “B”
VENT
HEAT FAB
SAF-T VENT SC
HEAT FAB
SAF-T VENT SC
“N.R” - Not recommended “N.A.” - Not applicable
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FIGURE 12: VERTICAL COAXIAL DIRECT VENT USING CROWN #500005 VENT KIT (VENT OPTION 11)
FIGURE 13: VERTICAL COAXIAL DIRECT VENT USING HEAT FAB SAF-T VENT SC (VENT OPTIONS 12, 13)
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TABLE 4: PERMISSIBLE VENT SYSTEMS AND PRINCIPLE VENT COMPONENTS
CONDENSATE
TRAP
WALL
THIMBLES
HORIZONTAL
TERMINATION
VERTICAL
TERMINATION
MANUFACTURER VENT SYSTEM SIZE
7393GC
7393GCS
5391CI
ELBOW: 7314TERM
TEE: 7390TEE
9321
(NOTE 3)
3
5300CI
5400CI
SAF-T VENT
EZ SEAL
7493GC
7493GCS
5491CI
9421
(NOTE 3)
ELBOW: 7414TERM
TEE: 7490TEE
4
HEAT FAB
ELBOW (NOTE 5):
SC03HT + 7314TERM
TEE (NOTE 5):
5300CI + SC03VT
(NOTE 6)
SC03DRN
(NOTE 3)
SC03FS
SC03FSA
3
SC03HT + 7390TEE
SAF-T VENT SC
4
ELBOW (NOTE 5):
SC04HT + 7414TERM
TEE (NOTE 5):
5400CI
+ SC04VT
(NOTE 6)
SC04DRN
(NOTE 3)
SC04FS
SC04FSA
SC04HT + 7490TEE
ELBOW: FSELB9003 + FSBS3
TEE: FSTT3
3
FSHDT3
FSWT3
FSWT4
FSRC3
FSRC4
FASNSEAL
4
FSHDT4
OR FSCD4
(NOTE 4)
ELBOW: FSELB9004 + FSBS4
TEE: FSTT4
PROTECH
SYSTEMS
ELBOW: FSA-SWDW3
+ FSELB9003 + FSBS3
TEE: FSA-SWDW3 + FSTT3
W2-T3
+W2-DF3
INC.
3
W2-WT3
W2-RC3
FASNSEAL W2
ELBOW: FSA-DWSW4
+ FSELB9004 + FSBS4
TEE: FSA-SWDW4 + FSTT4
W2-T4
+ W2-DF4
4
3
4
W2-WT4
W2-RC4
ELBOW: 2SVSTEX0390
TEE: 2SVSTTF03
SVEDWCF03
SVEDWCF04
2SVSWTEF03
2SVSWTEF04
2SVSRCF03
2SVSRCF04
SVE
SERIES III
(“Z-VENT III”)
Z-FLEX
ELBOW:
2SVEEWCF0490 + 2SVSTPF
TEE: 2SVSTTF04
ELBOW: CGSW90LTM(3”)
TEE: CGSWTTM(3”)
3
4
CGSWDS(3”)
CGSWDS(4”)
CGSWWPK(3”)
CGSWWPK(4”)
CGSWC(3”)
CGSWC(4”)
METAL-FAB
CORR/GUARD
ELBOW: CGSW90LTM(4”)
TEE: CGSWTTM(4”)
NOTES:
1) See vent system manufacturer’s literature for other part numbers that are required such as straight pipe, elbows, firestops and
vent supports.
2) In addition to terminals shown, Crown coaxial terminals may be used in some cases. See Table 3 for applications and Crown
part numbers.
3) All Heat Fab condensate traps shown may be installed in vertical or horizontal run.
4) Protech FSCD4 condensate trap may be installed in a vertical or horizontal run. All other Protech traps must be installed in a
horizontal run only.
5) Heat Fab Saf-T Vent SC may not be used for horizontal coaxial venting - a separate air inlet pipe must be provided for hori-
zontal direct vent systems. SC03HT or SC04HT adapters are used to adapt from SC pipe to terminal. Use of SC pipe in horizon-
tal systems does allow for reduced clearances to combustibles in some applications. See Table 2.
6) Heat Fab SC03VT or SC04VT adapters are required on any vertical vent system using Saf-T Vent SC even when combustion
air is obtained through a separate pipe or from the boiler room.
7) Metal-Fab CGSWDS condensate traps may only be installed in a horizontal run.
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12) Vertical and horizontal sections of piping must be properly supported. See vent system manufacturer’s instructions for more
information.
13) Non-coaxial vent piping must be accessible for periodic inspection.
14) Fire stops and wall thimbles – Use fire stops where required by code or by the vent system manufacturer. Consult vent
system manufacturer’s literature for information on suitable fire stops.
15) Supports - Vertical and horizontal sections of vent pipe must be properly supported. See the Vent System assembly section
of this manual for more information.
B. Removing an Existing Boiler From a Common Chimney
Read this only if the CWD boiler is replacing an existing boiler that is being removed from a common chimney. This
section does not apply to the installation of a CWD boiler.
In some cases, when an existing boiler is removed from a common chimney, the common venting system may be too
large for the remaining appliances. At the time of removal of an existing boiler, the following steps shall be followed with
each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining
connected to the common venting system are not in operation.
(a) Seal any unused openings in the common venting system.
(b) Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction,
leakage, corrosion and other deficiencies which could cause an unsafe condition.
(c) Insofar as practical, close all building doors and windows and all doors between the space in which all the appliances
remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and
any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
(d) Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so the appliance will
operate continuously.
(e) Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or
candle, or smoke from a cigarette, cigar, or pipe.
(f) After it has been determined that each appliance remaining connected to the common venting system properly vents when
tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliances to
their previous condition of use.
(g) Any improper operation of the common venting system should be corrected so the installation conforms with the National
Fuel Gas Code, ANSI Z223.1. When resizing any portion of the common venting system, the common venting system
should be resized to approach the minimum size as determined using the appropriate tables in Part 11 of the National Fuel
Gas Code, ANSI Z223.1.
WARNING
NEVER COMMON VENT A CWD BOILER WITH OTHER APPLIANCES
TABLE 5a: VENT FITTING
EQUIVALENT LENGTH
TABLE 5b: AIR INTAKE FITTING
EQUIVALENT LENGTH
VENT FITTING
EQUIVALENT
LENGTH (ft)
INTAKE FITTING
EQUIVALENT
LENGTH (ft)
3” 90 ELBOW
3” 45 ELBOW
5.5
4.0
4” 90 ELBOW
4” 45 ELBOW
8.0
4.5
HEAT FAB SC03E90
5.5
HEAT FAB SC03E90
(3” COAXIAL 90 ELBOW)
(3” COAXIAL 90 ELBOW)
HEAT FAB SC03E45
4.0
HEAT FAB SC03E45
(3” COAXIAL 45 ELBOW)
(3” COAXIAL 45 ELBOW)
CONSULT CROWN
4” 90 ELBOW
4” 45 ELBOW
8.0
4.5
8.0
HEAT FAB SC04E90
(4” COAXIAL 90 ELBOW)
HEAT FAB SC04E45
(4” COAXIAL 45 ELBOW)
HEAT FAB SC04E90
(4” COAXIAL 90 ELBOW)
HEAT FAB SC04E45
4.5
(4” COAXIAL 45 ELBOW
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FIGURE 14: HORIZONTAL TERMINAL OFFSETS
FIGURE 15a: LOCATION OF DIRECT VENT TERMINAL RELATIVE TO WINDOWS, DOORS, GRADE
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FIGURE 15b: LOCATION OF DIRECT EXHAUST TERMINAL RELATIVE TO WINDOWS, DOORS, GRADE
FIGURE 15c: LOCATION OF VENT TERMINAL RELATIVE TO METERS AND FORCED AIR INLETS
FIGURE 15d: POSITIONING VENT TERMINAL UNDER OVERHANGS
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FIGURE 16: USE OF CONDENSATE TRAPS
C. Vent / Intake System Assembly
1) General Assembly Notes:
a) Where the use of “silicone” is called for in the following instructions, use GE RTV 106 for the vent collar and coaxial
terminal. Air inlet piping sections are sealed with any general-purpose silicone sealant such as GE RTV102. PVC air inlet
piping sections are connected with PVC cement.
b) Longitudinal welded seams should not be placed at the bottom of horizontal sections of exhaust pipe.
c) Do not drill holes in vent pipe.
d) Do not attempt to mix vent components of different vent system manufacturers.
e) In some cases, there are differences between the vent system installation instructions in this manual and those in the
vent system manufacturer’s manual. Where such differences exist, this manual takes precedence over the vent system
manufacturer’s manual.
CAUTION
Vent systems made by Heat Fab, Protech, and Z-Flex rely on gaskets for proper sealing. When these vent systems are
used, take the following precautions:
• Make sure that gasket is in position and undamaged in the female end of the pipe.
• Make sure that both the male and female pipes are free of damage prior to assembly.
• Only cut vent pipe as permitted by the vent manufacturer in accordance with their instructions. When pipe is cut,
cut end must be square and carefully deburred prior to assembly.
2) Vent Collar Installation – The vent collar is shipped loose in the accessory bag along with two collar gaskets, the outlet
orifice, and four 10-32 mounting screws. Verify that the 6 digit part number model number marked on the outlet exhaust
orifice matches that shown in Table 6. Mount the collar and orifice as shown in Figure 17. If desired, the first piece of
exhaust pipe can be connected to the collar before mounting the collar on the boiler.
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TABLE 6: FAN OUTLET
ORIFICE
ORIFICE
BOILER MODEL
PART #
CWD060
CWD083
CWD110
CWD138
CWD165
CWD193
CWD220
CWD245
620133
650136
620135
620136
620137
620138
620139
650138
FIGURE 17: INSTALLATION OF FAN OUTLET ORIFICE
3) Optional Coaxial Terminal Installation – If the optional coaxial terminal is used, it should be installed in the wall before vent
assembly is started. Install the terminal in accordance with the following procedure (Figures 18a & 18b):
NOTE
• Coaxial portion of inside terminal section may be installed in direct contact with combustible construction.
• Maximum wall thickness through which this terminal can be installed is 10”
a) Position the wall face plate on the outside wall in the desired terminal location. Verify that this location will permit the
terminal, and connected venting, to clear any obstructions on the inside of the wall with the appropriate clearances. Mark
the location of the round opening on the wall.
b) For 3” terminals, cut a 5 ¼” Diameter hole through the wall at this location. For 4” terminals, cut a 7 1/4” opening.
c) Attach the mounting plate to the outside wall with suitable fasteners.
d) Attach the intake terminal to the straight coaxial section. To do this, clean the male and female ends of the inner pipes
with an alcohol pad. Lubricate the gasket in the female end of the straight section with a package of the silicone lubricant
provided and then push the intake terminal firmly onto the straight section until the intake terminal makes contact with
the bead on the straight section. Secure the two fittings together with the self-drilling screws provided. Use a low torque
setting to install these screws so as not to strip out the holes.
e) Pass the assembled intake terminal and straight section through the wall from the outside. Bend the four Tabs in the wall
face plate towards the outside when doing this. Do not attach the pipe to the plate yet.
f) Adjust the position of the terminal in the wall so that the edge of the intake skirt is 2-3” from the wall plate (Figure 18b).
Also verify that the terminal is pitched in the same direction as the rest of the vent system.
g) Attach the intake/straight section to the wall face plate using the self drilling screws provided.
h) Loosen the hose clamp on the end of the exhaust terminal. Mount the exhaust terminal onto the intake terminal with the
“V” horizontal (flue gas openings on top and bottom) as shown in Figure 18b. Slip the hose clamp over the “fingers” on
the intake terminal and tighten the clamp.
i) Seal all exposed exterior joints, including the joint between the wall face plate and the wall and between the wall face
plate and the straight section with an exterior grade silicone sealant.
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FIGURE 18a: CROWN COAXIAL TERMINAL EXPLODED VIEW
FIGURE 18b: CROWN COAXIAL TERMINALASSEMBLY
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j) Attach the intake tee to the end of the straight section protruding from the inside wall. Use the procedure described in (d)
to clean and assemble these parts.
k) If the inside terminal section is not supported by the wall through which it passes, install additional supports or bracing
to support the terminal. Bracing in contact with the coaxial section of the terminal may be combustible.
4) Assembly of Metal-Fab Corr/Guard Vent System:
a) Corr/Guard General Notes:
• Do not cut Corr/Guard vent components.
• Refer to Corr/Guard installation instructions for proper methods of support.
• Orient Corr/Guard components so that the males ends of all fittings point in the direction of the boiler.
b) Start assembly of the vent system at the boiler. Remove the hose clamp shipped on the BWC vent collar. Bend the three
hose clamp tabs on this collar outward slightly.
c) Clean the exterior of the male end of the first piece of pipe and the inside of the vent collar on the boiler. Remove dirt,
grease, and moisture from the surfaces to be sealed. Dry surfaces or allow to dry thoroughly.
d) On the male end of the pipe, apply a ¼” wide bead of silicone approximately 1/2” from the end of the pipe (Fig 7.47).
e) Insert the male end of the pipe into the boiler vent collar until it bottoms out.
f) Apply an additional bead of silicone over the outside of the joint and smooth out.
g) Replace and tighten the clamp on the vent collar.
h) Assemble remaining Corr/Guard components in accordance with the Corr/Guard installation instructions.
i) Allow the silicone to cure per the silicone manufacturer’s instructions before operating the boiler.
Note: To join Corr/Guard to a Crown coaxial terminal, leave the Corr/Guard gasket in place. Apply a ¼” bead of silicone
to the terminal connection about ¼” from its end. Slip the Corr/Guard female end over the terminal end so that there is
an overlap of approximatley 1 ¾ inches. Apply and smooth silicone over the outside of the joint including the tabs in the
female end of the Corr/Guard pipe. Tighten the terminal hose clamp to mechanically lock the pipe onto the terminal.
FIGURE 19: CORR/GUARD CONNECTION TO VENT COLLAR
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5) Assembly of Z-Flex Z-Vent III:
a) General Notes:
• Non-expanded ends of SVE Series III piping sections may be cut using aviation snips or a 24 thread per inch hacksaw.
File or sand the cut end smooth before assembling. Expanded ends may be cut to adapt the SVE series III to the vent
collar or Crown coaxial terminal. See the following instructions.
• Support horizontal piping sections at intervals of 48” or less.
• Vertical venting systems must be supported by at least one Z-Flex fire stop. An additional vertical support is required after
any offset and as required by the Z-Vent III installation instructions.
b) Start assembly of the vent system at the boiler. Remove the hose clamp shipped on the CWD vent collar. Bend the three
hose clamp tabs on this collar outward slightly.
c) Clean the exterior of the male end of the first piece of pipe and the inside of the vent collar on the boiler. Remove dirt,
grease, and moisture from the surfaces to be sealed. Dry surfaces or allow to dry thoroughly.
d) On the male end of the pipe, apply a ¼” wide bead of high temperature silicone approximately ½ inch from the male end
of the pipe. Apply ¼” beads of silicone along both sides of the longitudinal seam (Fig. 20).
e) Insert the male end of the pipe into the boiler vent collar until it bottoms out.
f) Apply an additional bead of silicone over the outside of the joint and smooth out. Also apply silicone over the seams in
the collar (Fig 20).
g) Replace and tighten the clamp on the vent collar.
h) The female end of each Z-Vent III component has a silicone sealing gasket. Examine all vent components to insure that
the gasket integrity has remained during shipping. Gaskets must be in the proper position or flue gas could leak resulting
in carbon monoxide poisoning.
i) Align the second piece of pipe with the first and push them together as far as they will go, but not less than 1 3/4”.
j) Tighten gear clamp to a minimum torque of 40 in-lbs and a maximum of 50 in-lbs.
k) Repeat Steps (h) – (j) for the remaining Z-Vent III components. If a termination elbow is used, use this procedure to
complete the vent system.
l) If a termination elbow or tee is used, a locking band or gear clamp must be used at either side of the wall penetration to
prevent shifting of the vent system in and out of the wall. This applies to both combustible and non-combustible walls.
m) To join Z-Vent III to a Crown coaxial terminal, a male end must be present at the end of the piping to be joined to the
terminal. It will therefore be necessary to cut off the expanded end of the pipe before it can be joined to the terminal.
This male end of the pipe must be inserted into the terminal connection with at least a 1” overlap. It may be necessary to
crimp the end of the vent pipe before it can be inserted into the terminal. Apply silicone to the male end of the pipe as in
(d) above, insert into the terminal, and apply an additional bead of silicone over the outside of the joint. Smooth out the
excess silicone and tighten the hose clamp on the terminal.
n) Allow the silicone to cure per the silicone manufacturer’s instructions before operating the boiler.
FIGURE 20: Z-VENT III CONNECTION TO VENT COLLAR
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6) Assembly of Heat Fab Saf-T Vent EZ Seal:
a) Saf-T Vent General Notes:
These instructions cover the installation of Saf-T Vent EZ Seal. Saf-T Vent EZ Seal piping has integral gaskets installed in
the female ends of the pipe which seal the joints.
• In general, Saf-T Vent pipe sections may not be cut. Exceptions to this are the Saf-T Vent slip connector and connections
to the boiler vent collar and Crown coaxial terminal. In these cases, use a sharp pair of aviation snips, an abrasive cut-off,
or a plasma cutter. See the Saf-T Vent instructions for information on cutting the slip connector.
• Orient Saf-T Vent components so that the arrows on the piping labels are in the direction of flue gas flow.
• Support horizontal piping sections at intervals of 6 feet or less.
• Vertical venting systems must be supported by at least one Heat Fab support. An additional vertical support is required
after any offset.
b) Connection to Boiler – Start assembly of the vent system at the boiler. Remove the hose clamp shipped on the CWD vent
collar. Bend the three hose clamp tabs on this collar outward slightly. Cut the male “spigot” off of the first piece of pipe
(Fig 21). If necessary, crimp the cut end of the pipe so that it can be inserted at least 1” into the collar. Clean the exterior
of the male end of the first piece of pipe and the inside of the vent collar on the boiler with an alcohol pad. On the male
end of the pipe, apply a ¼” wide bead of high temperature silicone approximately ½ inch from the male end of the pipe.
Also apply a ¼” bead of silicone along the first 2 ½” of the longitudinal weld. Insert the male end of the pipe into the
boiler vent collar until it bottoms out. Apply an additional bead of silicone over the outside of the joint and smooth out
(Fig 21). Apply silicone over the seams in the vent collar. Replace and tighten the clamp on the vent collar.
c) Assembly of Saf-T Vent EZ Seal Vent Components - Clean the male end of the next piece of pipe with an alcohol pad and
make sure that it is free of burrs. Check the female end of the first piece of pipe to make sure that the gasket is in place
and is undamaged. Using a slight twisting motion, insert the male end of the second fitting into the female end of the first
fitting, taking care not to dislodge or cut the factory gasket. In extremely arid conditions, it may be easier to assemble
these fittings if the gasket is moistened with water prior to assembly. Bend the locking tabs over the locking ring on the
adjacent piece of pipe. Repeat these steps for the remaining Saf-T-Vent components. If a termination elbow is used, use
this procedure to complete the exhaust system.
d) Connection of Saf-T Vent to Crown coaxial terminal - Cut the locking tabs off of the female end of the Saf-T Vent
pipe to be joined to the co-axial terminal. Apply a ¼” bead of silicone around the terminal connection about ¼” from
the end. Slip the Saf-T Vent pipe over the terminal and apply a second bead of silicone over the joint. Silicone must be
applied even though there is a gasket on the female end of the pipe. Smooth the excess silicone over the joint, making
sure that there are no visible voids in the silicone. Tighten the terminal clamp. Allow the silicone to cure per the silicone
FIGURE 21: SAF-T VENT EZSEAL CONNECTION TO VENT COLLAR
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manufacturer’s instructions before operating the boiler.
7) Assembly of Heat Fab Saf-T Vent SC - On CWD Boiler installations where Saf-T Vent SC is used, some Saf-T Vent EZ
Seal (single wall pipe) will always be required between the boiler and the Saf-T Vent SC. Install this pipe as described
above. On all systems except vertical coaxial systems (Options 12, 13), the following Heat Fab adapters will be needed to
adapt from Saf-T Vent EZ Seal to Saf-T Vent SC:
Vent Size
3”
4”
Heat Fab Part Number
SC03ADEZ
SC04ADEZ
On vertical coaxial vent systems employing Saf-T Vent SC, the transition from Saf-T Vent to Saf-T Vent SC is made with
one of the following Air Intake Tees:
Vent Size
3”
4”
Heat Fab Part Number
SC03TAD4
SC04TAD4
Assemble the Saf-T Vent EZ Seal to the boiler and the adapter as described in (6) above. Proceed as follows to assemble the
Saf-T Vent SC:
a) Clean both ends of the inner pipes to be joined with an alcohol pad. This will remove any foreign matter which may effect
the integrity of the seal. Insert the male end of the first piece of pipe into the adaptor. In extremely dry conditions it may
be helpful to moisten the gasket with clean water prior to assembly.
b) Push the first Saf-T Vent SC section into the adaptor until the outer jacket has made contact with the snap ring located
inside the female end of the adaptor. When fully assembled the outer female end will overlap the male end by 1”.
c) Use the three self tapping screws provided with the vent to attach the first piece of pipe to the adapter. No pre drilling is
required. If using a variable torque screw gun, use the low torque setting to install the screws so as not to strip out the
holes. If a hole does become stripped due to over tightening, a larger (1/2” long max.) screw or short pop rivet may be
used.
d) Seal all the joints in the outer jacket with foil tape or exterior grade silicone sealant.
e) Repeat steps (a - d) to assemble the remaining sections of Saf-T Vent SC.
f) Support the Saf-T Vent SC as called for in Heat Fab’s installation instructions. Also make sure that fire stops are provided
as called for in Heat Fab’s instructions and local codes.
g) After the Saf-T Vent SC exits the building, one of the following adaptors will be needed to install the terminal:
Vent Size
3”
4”
Heat Fab Part Number
5300CI
5400CI
On vertical coaxial vent systems (Vent Options 12, 13) this adapter also acts as the combustion air intake terminal. In other
installations, the openings in this adapter provide ventilation between the inner and outer walls.
FIGURE 22: FASNSEAL CONNECTION TO VENT COLLAR
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8) Assembly of Protech FasNSeal
a) FasNSeal General Notes:
• Do not cut 4” FasNSeal pipe. Consult FasNSeal instructions for method of cutting other 3” pipe.
• Orient FasNSeal vent components so that the arrows on the piping labels are in the direction of flue gas flow.
• Support horizontal piping sections at intervals of 6 feet or less.
• Vertical venting systems must be supported by at least one FasNSeal support. An additional vertical support is required
after any offset.
a) Remove the hose clamp shipped on the CWD vent collar. Bend the three hose clamp tabs on this collar outward slightly.
Clean the exterior of the male end of the first piece of pipe and the inside of the vent collar on the boiler. Remove dirt,
grease, and moisture from the surfaces to be sealed. Dry surfaces or allow to dry thoroughly. On the male end of the pipe,
apply a ¼” wide bead of high temperature silicone approximately 1/4 inch from the male end of the pipe. Insert the male
end of the pipe into the boiler vent collar until it bottoms out. Apply an additional bead of silicone over the outside of the
joint and the seams on the vent collar and smooth out (Fig 22). Replace and tighten the clamp on the vent collar.
b) All other joints in the FasNSeal venting system rely on a gasket in the female end of the pipe for a proper seal.
c) Align the longitudinal seam of both pipes. Insert the male end of the second pipe into the female end of the first pipe until
the bead on the male end contacts the flare on the female end (Fig. 17b).
d) Tighten the locking band with a nut driver.
e) Repeat (c) and (d) for the remaining FasNSeal components. If a termination elbow is used, use this procedure to complete
the exhaust system.
f) To join FasNSeal to a Crown coaxial terminal, remove the hose clamp from the female FasNSeal end to be joined to the
terminal. Leave the FasNSeal gasket in place. Apply a ¼” bead of silicone to the terminal connection about ¼” from its
end. Slip the FasNSeal female end over the terminal end so that there is an overlap of 1 ¾ inches. Apply and smooth
silicone over the outside of the joint including the rectangular hose clamp opening in the FasNSeal pipe. Tighten the
terminal hose clamp to mechanically lock the pipe onto the terminal.
g) Allow the silicone to cure per the silicone manufacturer’s instructions before operating the boiler.
9) Assembly of Protech FasNSeal W2 - On CWD Boiler installations where Protech FasNSeal W2 is used, some Protech
FasNSeal (single wall pipe) will always be required between the boiler and the FasNSeal W2. Install this pipe as described
above. On all systems, the following components will be needed to adapt from Protech FasNSeal to FasNSeal W2:
Vent Size
Protech Part Number
FSA-SWDW3
3”
4”
FAS-SWDW4
Follow the joint connection instructions provided with the FasNseal W2. In vertical vent systems, terminate the vent system
with the cap called for FasNSeal W2 in Table 4. In horizontal vent systems one of the following adapters will be required
between the FasNSeal W2 and the terminal:
Vent Size
3”
4”
Protech Part Number
FSA-DWSW3
FAS-DWSW4
10) Assembly of the air intake system:
a) Assemble the air intake system using either galvanized or PVC pipe.
b) If PVC piping is used, use PVC cement to assemble the PVC intake system components.
c) If galvanized piping is used, use at least two sheet metal screws per joint. Seal the outside of all joints.
d) A 4” galvanized smoke pipe will fit inside the inlet collar on the CWD boiler. Depending upon the exact OD of the
pipe used, it may be necessary to crimp this pipe. Secure with a single #10 sheet metal screw through the hole in the
inlet collar and seal the outside of the joint with silicone. If PVC is used for the intake system, use a short piece of 4”
galvanized pipe to connect the PVC to the boiler. Silicone the outside of the joint between the PVC and galvanized pipe.
e) Either PVC or galvanized pipe will fit over the combustion air connection on the Crown coaxial terminal. Secure the
pipe to the terminal with at least two #10 sheet metal screws. Seal the outside of the joint between the inlet pipe and the
coaxial terminal.
f) Two 90-degree elbows may be used to make the 180-degree air intake termination elbow used on vertical direct vent
installations.
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11) Assembly of Vertical Coaxial Vent System Using Crown #500005 Coaxial Vent Kit (Vent Option #11)
a) Start by installing the “B” vent piping. Install and assemble this piping in accordance with the “B” vent manufacturer’s
instructions. Seal the joints between sections of “B” vent with GE RTV 106 or Dow 732 RTV sealant. Consult the “B”
vent manufacturer’s instructions for the clearance to combustibles (typically 1”) as well as for fire stop and support
requirements.
Install a 5” “B” vent Tee on the bottom of the run of “B” vent as shown in Figure 12. Extend the run of “B” vent far
enough above the roof so that the bottom of the air intake hood will be at least one foot above the normal snow line that
can be expected on the roof. Seal the roof penetration with a “B” vent roof flashing and storm collar in accordance with
the “B” vent manufacturer’s instructions.
b) Assemble the vent piping that is to be run inside the “B” vent and drop it through the “B” vent. Join and seal the vent
piping in accordance with the instructions 4, 5,6 or 8 above. Use the longest sections of vent piping possible so as to
minimize the number of joints inside the “B” vent. Temporarily support the vertical section of vent pipe from underneath
so that the top of the vent pipe is at the correct height (Figure 12).
c) Slip the Crown concentric air intake hood over the vent pipe and seat it on the “B” vent. Secure the concentric air intake
hood to the “B” vent with at least three sheet metal screws. Install a storm collar compatible with the vent system over
the vent pipe. Secure and seal it in accordance with the vent manufacturer’s instructions. Note: this collar provides a
watertight seal between the vent piping and the concentric air intake hood and also supports the vent piping. Once the
storm collar is installed, remove the temporary vent support. Install a compatible rain cap on the top of the vent system
(Table 4).
d) Slip the Crown vent support over the vent pipe protruding from the bottom of the “B” vent. Orient the vent support so
that it will be possible to tighten the gear clamp by reaching through the side opening in the “B” vent Tee (Figure 23).
Attach the vent support to the “B” vent Tee with at least three sheet metal screws. Tighten the gear clamp. Seal all joints
in between the vent support, the vent pipe, and the “B” vent.
e) Install the vent piping between the boiler and the vertical section of “B” vent already installed. Observe the clearance and
support requirements in the installation manual.
f) Install a 5 x 4 single wall reducer in the side connection of the “B” vent Tee. Install 4” galvanized or PVC piping between
this reducer and the combustion air intake on the boiler. Seal all joints in the air intake piping.
12) Condensate Traps:
a) Trap should have the basic configuration shown in Figure 24. All tubing is 3/8 I.D.
b) All drain tubing must be acid resistant.
c) At least the first 6 inches of tubing must be silicone with a 300F temperature rating.
d) Pipe condensate to a drain or other suitable location. Make sure that condensate disposal method is in accordance with
local regulations. Ensure condensate is not subjected to freezing temperatures.
13) Rodent Screens:
a) A rodent screen is provided with the CWD boiler. On direct exhaust boilers, this screen is installed in the air inlet collar
on the boiler and held in place with screws or RTV sealant.
b) The Crown coaxial terminal has integral inlet and exhaust rodent screens. The rodent screen supplied with the boiler is not
used when the boiler is installed with the coaxial terminal.
c) In horizontal direct vent installations using termination elbows or tees, the rodent screen provided is mounted in the air
inlet elbow. A second screen is required for the exhaust elbow. This second screen can be any one of the following items:
•
•
•
A rodent screen provided by the vent system manufacturer.
A second Crown rodent screen (Crown #60-601).
A rodent screen made of stainless steel screen having a ½” (2 x 2) or greater mesh.
d) In vertical direct vent or direct exhaust systems, no rodent screen is required on the exhaust terminal. The rodent screen
is installed either on the 180-degree inlet elbow (direct vent installations) or on the boiler inlet collar (direct exhaust
installations).
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FIGURE 23: INSTALLATION OF VENT SUPPORT PROVIDED IN CROWN #500005 VERT. COAXIAL VENT KIT
FIGURE 24: CONDENSATE TRAP/DRAIN DETAIL
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VII Gas Piping
Gas piping to the boiler must be sized to deliver adequate gas for the boiler to fire at the nameplate input at a line pressure
between the minimum and maximum values shown on the rating plate. For more information on gas line sizing, consult the
utility or the National Fuel Gas Code.
Figure 25 shows typical gas piping connections to the CWD boiler. A sediment trap must be installed upstream of all gas
controls. Install a manual shutoff valve outside the jacket and ground joint union as shown.
The boiler and its gas connection must be leak tested before placing the boiler in operation. When doing this, the boiler and
its individual shut-off must be disconnected from the rest of the system during any pressure testing of that system at pressures in
excess of ½ psi. When pressure testing the gas system at pressures of ½ psi or less, isolate the boiler from the gas supply system
by closing its individual manual shut-off valve.
FIGURE 25: GAS CONNECTION TO BOILER
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VIII System Piping
CAUTION
• Install boiler so that the gas ignition system components are protected from water (dripping, spraying, rain, etc)
during appliance operation and service (circulator replacement, etc).
• Operation of this boiler with continuous return temperatures below 120F can cause severe heat exchanger corrosion
damage.
• Operation of this boiler in a system having significant amounts of dissolved oxygen can cause severe heat exchanger
corrosion damage.
• Do not use toxic additives, such as automotive antifreeze, in a hydronic system.
A. Standard Piping
Figure 26 shows typical boiler system connections on a single zone system. Additional information on hydronic system
design may be found in Installation of Residential Hydronic Systems (Pub. #200) published by the Hydronics Institute in
Berkely Heights, NJ. The components in this system and their purposes are as follows:
1) Relief valve (Required) – Install the relief valve in the 3/4” tapping on the left side of the boiler as shown in Figure 1. The
relief valve shipped with the boiler is set to open at 30 psi. This valve may be replaced with one having a setting of up to
the Maximum Allowable Working Pressure (MAWP) shown on the rating plate. If the valve is replaced, the replacement
must have a relief capacity in excess of the Minimum Relief Valve Capacity shown on the rating plate.
Pipe the discharge of the relief valve to a location where water or steam will not create a hazard or cause property damage
if the valve opens. The end of the discharge pipe must terminate in an unthreaded pipe. If the relief valve discharge is not
piped to a drain, it must terminate at least 6 inches above the floor. Do not run relief valve discharge piping through an area
that is prone to freezing. The termination of the relief valve discharge piping must be in an area where it is not likely to
become plugged by debris.
DANGER
•
•
•
•
Pipe relief valve discharge to a safe location.
Do not install a valve in the relief valve discharge line.
Do not move relief valve from factory location.
Do not plug relief valve discharge.
2) Circulator (Required) – Although the circulator is shipped on the boiler return, it can be installed on the boiler supply. If the
circulator is moved to the supply it should be positioned just downstream of the expansion tank as shown in Figure 26.
3) Expansion Tank (Required) – If this boiler is replacing an existing boiler with no other changes in the system, the old
expansion tank can generally be reused. If the expansion tank must be replaced, consult the expansion tank manufacturer’s
literature for proper sizing.
4) Fill Valve (Required) – Either a manual or automatic fill valve may be used. The ideal location for the fill is at the expansion
tank.
5) Automatic Air Vent (Required) – At least one automatic air vent is required. Manual vents will usually be required in other
parts of the system to remove air during initial fill.
6) Low Water Cut-Off (Required in some situations) – A low water cut-off is required when the boiler is installed above
radiation. In addition, some codes, such as ASME CSD-1, require low water cut-offs. Codes may also require that this low
water cut-off have a manual reset function. The low water cut-off may be a float type or probe type but must be designed
for use in a hot-water system. The low water cut-off should be piped into the boiler supply just above the boiler with no
intervening valve between it and the boiler.
Use a low water cut-off that breaks the 120 VAC supply to the boiler. Do not attempt to connect a 24-volt low water
cut-off into the boiler factory wiring.
7) Manual Reset High Limit (Required by some codes) – This control is required by ASME CSD-1 and some other codes.
Install the high limit in the boiler supply piping just beyond the boiler with no intervening valves. Set manual reset high
limit as far above the operating limit setting as possible, but not over 240F. Wire the control to break the 120 VAC electrical
supply to the boiler.
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8) Flow control valve (Required under some conditions) – The flow control valve prevents flow through the system unless the
circulator is operating. A flow control valve may be necessary on converted gravity systems to prevent gravity circulation.
Flow control valves are also used to prevent “ghost flows” in circulator zone systems through zones that are not calling for
heat.
9) Isolation Valves (Optional) – Isolation valves are useful if the boiler must be drained, as they will eliminate having to drain
and refill the entire system.
10) Drain Valve – The drain valve is shipped in the boiler parts bag. Install it in the location shown in Figure 1.
B. Piping for Special Situations
Certain types of heating systems have additional requirements. Some of the more common variations follow:
1) Indirect Water Heaters – Figure 27 shows typical indirect water heater piping. Boiler piping is the same as for any two-zone
system. Figure 27 shows circulator zoning, which is usually preferred for indirect water heaters. Size the circulator and
indirect water heater piping to obtain the boiler water flow through the indirect water heater called for by the indirect water
heater manufacturer. The standard CWD control system will operate two circulator zones. See the Wiring section of this
manual.
2) Gravity and “Large Water Volume” Systems – The piping shown in Figure 28 will minimize the amount of time that the
boiler operates with return temperatures below 120F on these systems. A bypass is installed as shown to divert some supply
water directly into the return water. The bypass pipe should be the same size as the supply. The two throttling valves shown
are adjusted so that the return temperature rises above 120F during the first few minutes of operation. A three-way valve
can be substituted for the two throttling valves shown. If the circulator is mounted on the supply, the bypass must be on the
discharge side of the circulator.
3) Low Temperature Systems – Some systems, such as radiant tubing systems, require the system water temperature to
be limited to a value below the temperature of the water leaving the CWD. These systems also typically have return
temperatures well below the 120F minimum.
Figure 29 illustrates the use of a heat exchanger to connect a CWD boiler to this type of system. The heat exchanger will
permit the transfer of heat from the boiler water to the low temperature system while holding the system supply and boiler
return temperatures within their limits. For this system to work properly, the heat exchanger must be properly sized and
the correct flow rates are required on either side of the heat exchanger. Consult the heat exchanger manufacturer for sizing
information. The water in the boiler is completely isolated from the water in the system. This means that separate fill and
expansion tanks are required for the heating system loop.
There are several other ways to connect low temperature systems to the non-condensing boilers like the CWD such as
four way mixing valve and variable speed injection pumping systems.
4) Systems containing oxygen – Many hydronic systems contain enough dissolved oxygen to cause severe corrosion damage
to a cast iron boiler such as the CWD. Some examples include:
• Radiant systems that employ tubing without an oxygen barrier.
• Systems with routine additions of fresh water.
• Systems which are open to the atmosphere.
If the boiler is to be used in such a system, it must be separated from the oxygenated water being heated with a heat
exchanger as shown in Figure 29.
Consult the heat exchanger manufacturer for proper heat exchanger sizing as well as flow and temperature requirements.
All components on the oxygenated side of the heat exchanger, such as the pump and expansion tank, must be designed for
use in oxygenated water.
5) Piping with a Chiller – If the boiler is used in conjunction with a chiller, pipe the boiler and chiller in parallel as shown in
Figure 30. Use isolation valves to prevent chilled water from entering the boiler.
6) Air Handlers – Where the boiler is connected to air handlers through which refrigerated air passes, use flow control valves
in the boiler piping or other automatic means to prevent gravity circulation during the cooling cycle.
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FIGURE 26: BASIC PIPING
FIGURE 27: INDIRECT WATER HEATER BOILER-SIDE PIPING
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FIGURE 28: BYPASS PIPING
FIGURE 29: ISOLATION OF BOILER FROM SYSTEM WITH HEAT EXCHANGER
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FIGURE 30: CHILLER PIPING
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IX Wiring
The CWD Series boiler is offered with two different types of control systems:
• CB502 Control System - Basic operation of the boiler is controlled with a “CB502 control” (Crown part #42-502) located
in the left side of the boiler vestibule. This device controls one or two circulator zones without the use of additional
controls and includes LEDs to show the status of the circulators, inducer, and other boiler controls.
• R8285 Control System - Basic operation of the boiler is controlled by a Honeywell R8285 fan center. This system
controls a single zone, although it can be used in a multiple zone system through the use of additional controls. No
diagnostic LEDs are included in this system.
Both of these control systems use the same gas valves, ignition system components, and pressure switches.
Separate wiring instructions are provided for each of these two control systems in the following two sections.
WARNING
• All wiring and grounding must be done in accordance with the authority having jurisdiction or, in the absence of
such requirements, with the National Electrical Code (ANSI/NFPA 70).
• If a low water cut-off is installed, wire it to break the 120VAC supply to the boiler. Attempting to wire a 24 volt
low water cut-off into the boiler, or otherwise modifying any of the 24 volt boiler wiring, will void the ANSI Z21.13
certification of this boiler and may cause unsafe boiler operation.
A. CB502 System - Single Zone Wiring
1) Line Voltage (120 VAC) Connections (Fig 31) – The line voltage connections are located in the junction box under the
transformer on the right side of the vestibule:
• Black – Line voltage “hot”
• White – “Neutral” for boiler and circulators
• Red – “Heating” circulator “hot”
• Blue – “Indirect Water Heater” circulator “hot” (This wire is not used in single zone installations)
• Green – Ground connection
2) Maximum circulator continuous current draw = 10A
3) Low Voltage (24 VAC) Connections (Fig 31) – These connections are screw terminals located on the front edge of the relay
board:
• T-T Heat 1 – “Heating” thermostat connections
• T-T DHW/H2 – “Indirect Water Heater” thermostat connections
• Heat anticipator setting for both thermostat connections is 0.03 A.
4) Priority Switch – When this switch is “on”, the “heating” circulator is turned off when a call for heat is present from
“indirect water heater” zone. It is used to ensure that the entire output of the boiler is available to the indirect water heater.
This switch should come from the factory in the “off” position and should be turned on only when absolutely necessary to
provide adequate domestic water.
5) Auxiliary Jumpers – Two jumpers are located on the relay board as shown in Figure 32. They are present for connection and
configuration of an auxiliary control. Unless instructions provided with the control call for these jumpers to be moved, they
should remain as shown in Figure 32.
CAUTION
A problem with the indirect water heater zone could result in a total lack of heat and freeze damage to the building if
this switch is in the priority “on” position.
•
•
•
Ensure that the priority switch is “off” when it is not to be used.
Set the priority switch “on” only when absolutely necessary.
Do not leave the priority switch “on” when the building will be empty for an extended period of time.
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FIGURE 31: CB502 CONTROL SYSTEM - SINGLE ZONE FIELD WIRING
FIGURE 32: CB502 CONTROL SYSTEM - FACTORY SWITCH / JUMPER CONFIGURATION
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B. CB502 System - Wiring Variations
1) Two Circulator Zones – Figure 33 shows wiring for two circulator zones. The second zone may be either an indirect water
heater or a heating zone. No additional electrical controls are required to operate two circulator zones with a standard CWD
boiler.
2) Hybrid Zone Valve/Circulator Zone System using Honeywell V8043Fs – The system shown in Figure 34 is useful when
zone valves are to be used for space heating zones but not the indirect water heater zone. Two circulators are wired into
the CWD boiler as shown in Figure 34. The zone valve end switches are connected in parallel and connected to the “T – T
Heat” thermostat connections. A separate transformer is required to power the zone valves – do not attempt to use the
transformer supplied with the boiler.
When a given heating thermostat calls, it opens the zone valve to which it is wired. When the zone valve opens, its end
switch makes, sending a call for heat to the CWD board. This starts the heating circulator and fires the boiler.
The indirect water heater thermostat is connected directly to T-T DHW/H2. Upon a call for heat, it starts the indirect
water heater circulator and fires the boiler. If the priority switch is “on”, a call from the indirect water thermostat also turns
off the heating circulator. CAUTION: Do not use the factory supplied transformer to power zone valves or other loads
external to the boiler.
C. CB502 Control System – Sequence of Operation
(Refer to Figures 35 and 36 for ladder and connection diagrams)
1) When no call for heat is present and 120 VAC power is supplied to the boiler, the transformer is energized. The “PWR” LED
connected across the transformer secondary glows.
2) Assuming that no call for heat is present from the “DHW/H2” thermostat connections, a call for heat from the “Heat 1”
thermostat will apply voltage across relay coil 1K and the “Heat” LED.
3) When the 1K relay coil is energized, contacts 1K1 make, starting the heating circulator. Contacts 1K2 also make, sending
power to the high limit.
4) Assuming that the high limit is made, voltage will appear across the “Limit” LED which will illuminate, verifying that the
high limit switch is closed.
5) At this point, the pressure switch should be open and continuity should be present between the COM” and “N.C.” contacts
on the pressure switch. If this is the case, relay coil 3K will be energized along with the “FAN” LED. In the event that
the pressure switch is stuck in “fan proven” position at the beginning of the operating sequence, the “NC” contact on the
pressure switch will be open at this point and the operating sequence will not proceed further. This prevents the boiler from
firing if the pressure switch is stuck in the “fan proven” position.
6) Once relay coil 3K1 is energized, contacts 3K1 and 3K2 make. Contacts 3K1 energize the fan. Contacts 3K2 provide a
“latch” for coil 3K, ensuring that coil 3K remains energized after the pressure switch “normally closed” contacts open.
7) Once the combustion fan has created an adequate pressure differential across the pressure switch, the pressure switch “NO”
contacts will make. Voltage is then applied across both the “PRESS” LED and the ignition module.
8) After 30 seconds has passed, the ignition module will initiate an ignition spark and apply 24 VAC across the pilot valve
(terminals “PV” and “MV/PV” on the gas valve).
9) If pilot flame is established before the 90 second trial for ignition period has ended, the spark will stop. Voltage is then
applied across the main valve (gas valve terminals “MV” and “MV/PV”) opening the valve and establishing main flame.
10) If no pilot flame is detected during the 90-second trial for ignition period, the pilot valve will close and the module will wait
30 seconds. It will then go through at least one more 90 second trial for ignition period, depending on the exact module
supplied with the boiler.
11) A call for heat from the DHW/H2 thermostat will energize relay coil 2K and the “DHW” LED. Relay contacts 2K1 make,
starting the domestic water circulator. SPDT contacts 2K2 also change position, breaking one current path to relay coil 1K
and energizing the high limit. The boiler will then start following the sequence outlined in Steps (4) - (10).
12) The “priority switch “SW1” is “on” when it is open and “off” when it is closed. If the priority switch is “off”, a current path
will still exist to relay coil 1K after the 2K2 N.C. contacts have opened. If the priority switch is “on” (as shown in Figure
35), relay coil 1K will be de-energized, causing contacts 1K1 and 1K2 to open. The “heat” circulator will be de-energized,
but the burner will continue to fire because the 2K2 “NO” contacts are made.
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FIGURE 33: CB502 CONTROL SYSTEM - FIELD WIRING FOR TWO CIRCULATOR ZONES
FIGURE 34: CB502 CONTROL SYSTEM - FIELD WIRING FOR HYBRID CIRCULATOR/ZONE VALVE SYSTEM
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FIGURE 35: CB502 CONTROL SYSTEM - INTERNAL LADDER DIAGRAM
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FIGURE 36: CB502 CONTROL SYSTEM - INTERNAL CONNECTION DIAGRAM
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D. R8285 Control System - Single Zone Wiring
1) Line Voltage (120 VAC) Connections (Fig 37) – The line voltage connections are located in the junction box under the
R8285 fan center on the right side of the boiler.
• Black – Line voltage “hot”
• White – “Neutral” for boiler and circulators
• Green – Ground connection
2) The circulator is factory wired. If a different circulator is wired to the boiler, its full load current draw must not exceed 12A.
3) Connect the 24-volt thermostat to terminals “R” and “G” on the R8285 fan center. Set the heat anticipator to 0.34 Amps.
E. R8285 Control System - Wiring Variations
1) Multiple Circulator Zones – Figure 38 shows wiring for two or more circulator zones using Honeywell R845As. One fewer
R845A is used than the total number of circulator zones. A DPST Honeywell RA832A may be substituted in place of the
R845A using the “X” and “X” terminals in place of the “5” and “6” terminals on a R845A.
A call for heat from the “zone #1” thermostat causes the zone #1 circulator to start and the boiler to fire exactly as in a
single zone system (see “Sequence of Operation”). A call for heat from any other thermostat will energize the DPST relay in
that zone’s R845A. When this relay is energized, electrical continuity is created between terminals 3 and 4, energizing the
circulator for that zone. At the same time, electrical continuity is created between terminals 5 and 6 on the R845A, creating
a current path from terminal “R” to “Y” on the R8285 fan center in the CWD. Assuming that the supply water temperature
is below the high limit setting, the normal ignition sequence will be initiated. If this happens when there is no call from the
zone #1 thermostat, the relay on the R8285A will not be energized and the zone #1 circulator will remain off.
2) Multiple Zones using Zone Valves – Figure 39 shows wiring for multiple zones using Honeywell V8043F zone valves. This
wiring diagram may be used for other 24-volt zone valves as long as they are equipped with end switches. Do not attempt
to use the transformer on the R8285 to power the zone valves; use a separate transformer. Up to five V8043Fs may be
powered by one 40VA transformer, such as the Honeywell AT87A.
A call for heat from a given thermostat will result in the application of 24 volts across the TH and TR terminals on the
corresponding zone valve, energizing the zone valve motor. The zone valve opens and the end switch contacts are then
made. The end switches are connected in parallel with each other and to the CWD “thermostat” connections so that any
zone valve that opens will also start the circulator and fire the boiler (assuming the high limit is not open). Zone valve
terminal TH/TR has no internal connection on the zone valve; it is merely a “binding post” used to connect two or more
wires.
F. R8285 Control System – Sequence of Operation
(Refer to Figures 40 and 41 for ladder and connection diagrams)
1) A call for heat from the thermostat energizes relay coil 1K (the relay on the R8285), causing contacts 1K1 and 1K2 to make.
Contact 1K1 starts the circulator. Contact 1K2 sends power to the high limit.
2) Assuming that the high limit is made, current will flow through the normally closed contacts on the pressure switch to relay
coil “2K” (the R8222 relay coil). Contacts 2K1 make, starting the combustion blower. Contacts 2K2 make, creating a
current path in parallel with the normally closed pressure switch contacts.
3) As the combustion fan comes up to full speed, the normally closed contacts on the vacuum switch break. Power remains
applied to the 2K coil, however, through the 2K2 contacts. Once the combustion fan has created adequate pressure across
the pressure switch, the normally open contacts on the pressure switch will make, sending power to the ignition module.
4) After 30 seconds has passed, the ignition module will initiate an ignition spark and apply 24 VAC across the pilot valve
(terminals “PV” and “MV/PV” on the gas valve).
5) If pilot flame is established before the 90 second trial for ignition period has ended, the spark will stop. Voltage is then
applied across the main valve (gas valve terminals “MV” and “MV/PV”) opening the valve and establishing main flame.
6) If no pilot flame is detected during the 90-second trial for ignition period, the pilot valve will close and the module will wait
30 seconds. It will then go through at least one more 90 second trial for ignition period, depending on the exact module
supplied with the boiler.
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FIGURE 37: R8285 CONTROL SYSTEM - SINGLE ZONE FIELD WIRING
FIGURE 38: R8285 CONTROL SYSTEM - FIELD WIRING FOR TWO CIRCULATOR ZONES
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FIGURE 39: R8285 CONTROL SYSTEM - ZONE VALVE FIELD WIRING
FIGURE 40: R8285 CONTROL SYSTEM - INTERNAL LADDER DIAGRAM
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FIGURE 41: R8285 CONTROL SYSTEM - INTERNAL CONNECTION DIAGRAM
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X Start-up and Checkout
WARNING
• Never attempt to fill a hot empty boiler.
• Never use a flame to check for gas leaks.
• Make sure that the area around the boiler is clear and free from combustible materials, gasoline, and other flam-
mable vapors and liquids.
• If antifreeze is used in the system, it must be a nontoxic type such as propylene glycol.
NOTE
Safe lighting and other performance criteria were met with the gas manifold and control assembly provided on the
boiler when the boiler underwent the tests specified in Z21.13.
Use the following procedure for initial start-up of the boiler:
1) Make sure that the boiler and system are filled with water.
2) Check all new gas piping for leaks and purge piping sections that are filled with air. See the National Fuel Gas Code for
additional information on testing and purging gas lines.
3) Verify that vent system is complete and free of obstructions before attempting to fire boiler. Make sure that the silicone cure
time called for in the vent assembly instructions has passed before firing boiler.
4) Inspect all wiring for loose or uninsulated connections.
5) Adjust thermostat to the highest setting.
6) Start the boiler using the lighting instructions on the opposite page.
7) Upon initial start-up, the gas train will be filled with air. Even if the gas line has been completely purged of air, it may take
several tries for ignition before a flame is established. Once a flame has been established for the first time, subsequent calls
for burner operation should result in a flame on the first try.
8) Observe pilot burner flame. Pilot burner produces three flames. The center one should be a steady medium blue flame
covering around 3/8” to ½” of spark electrode / flame rod (Figure 42).
9) Inspect the main burner flames visible through the observation port in burner access panel. The flame should be stable and
mostly blue. No yellow tipping should be present; however, intermittent flecks of yellow and orange in the flame are normal
(Figure 43).
10) Check entire gas train for leaks using soap and water or other approved leak detection method while boiler is firing. Fix any
leaks found immediately.
11) Run gas valve safety shutdown test. With main burners firing, disconnect ignition cable from ignition module. Both pilot
burner and main burners should stop firing.
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FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
A. This appliance is equipped with an ignition
device which automatically lights the pilot.
Do not try to light the pilot by hand.
If you cannot reach your gas supplier, call
the fire department.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob will
not push in or turn by hand, don’t try to repair it,
call a qualified service technician. Force or
attempted repair may result in a fire or explosion.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electric switch; do not
use any phone in your building.
Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to
replace any part of the control system and any
gas control which has been under water.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above on
this label.
5. Remove front access panel.
6. Rotate the gas control knob clockwise
to OFF.
2. Set the thermostat to lowest setting.
7. Wait five (5) minutes to clear out any gas. Then
smell for gas, including near the floor. If you then
smell gas, STOP! Follow “B” in the safety inform-
ation above on this label. If you don’t smell gas
go to the next step.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an ignition
device which automatically lights the pilot.
Do not try to light the pilot by hand.
8. Rotate the gas control knob counter clockwise
to “ON”.
GAS CONTROL KNOB
(SHOWN IN “ON” POSITION)
9. Replace front access panel.
10. Turn on all electric power to the appliance.
11. Set thermostat to desired setting.
GAS INLET
GAS OUTLET
12. If the appliance will not operate, follow the
instructions “To Turn Off Gas To Appliance” and
call your service technician or gas supplier.
GAS VALVE - TOP VIEW
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting.
3. Push in gas control knob slightly and turn
clockwise to “OFF”. Do not Force.
2. Turn off all electric power to the appliance if
service is to be performed.
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WARNING
Failure to follow the following procedure exactly could result in over-firing of the boiler and a carbon monoxide
hazard.
12) Check the manifold pressure and adjust if necessary. To do this, use the following procedure:
a) Connect a manometer to the line pressure tap on the gas valve (see Figure 44).
b) Check the line pressure with all gas appliances on and off. The line pressure at the boiler must be within the following
limits regardless of what combination of appliances is firing:
Line Press (inches w.c.)
Minimum
Maximum
Natural Gas
5.0
14.0
LP Gas
11.0
13.0
If the line pressure falls outside of these limits, find and correct the cause of the problem before proceeding further.
c) Disconnect the silicone regulator tube from the hose barb on the gas valve (Figure 45).
d) Connect a manometer to the manifold (outlet) pressure tap on the gas valve (Figure 44).
e) Read the manifold pressure. It should be set at:
Natural Gas
3.5
LP Gas
10.0
Manifold Press. (inches w.c.)
e) If a manifold pressure adjustment is needed, make the adjustment by turning the regulator screw (see Figure 44)
clockwise to raise the pressure and counter-clockwise to reduce the pressure. If a manifold pressure adjustment is made,
recheck the line pressure to be certain that it is still within acceptable limits. Replace the cover screw on the regulator.
f) Reconnect the silicone regulator tube disconnected in Step (c)
13) Test thermostat operation while the boiler is running. Turn the thermostat to the lowest setting. Circulator should stop
running. Raise the thermostat back to the highest setting. Circulator should restart. The pilot burner and main burners
should relight.
14) Verify high limit operation. Allow the boiler water temperature to increase to high limit setting. Circulator should continue
running and pilot burner and main burners should stop firing. When water temperature drops below the limit setting, the
pilot burner and main burners should relight.
15) After the boiler has operated for approximately 30 minutes, check the boiler and heating system piping for leaks. Repair any
leaks found at once.
16) Inspect the vent system for flue gas leaks. Repair any leaks found before leaving the boiler in operation.
FIGURE 43: MAIN BURNER FLAME
FIGURE 42: PILOT BURNER FLAME
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FIGURE 44: GAS VALVE
FIGURE 45: MEASURING MANIFOLD PRESSURE
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XI Service and Maintenance
The following routine maintenance should be performed on an annual basis:
1) Turn off electrical power and gas supply to the boiler.
2) Remove the burner tray. To do this:
a) Remove the intake cover.
b) Remove the four Allen head screws holding the elbow flange onto the gas valve.
c) Remove the three 10-32 screws holding the manifold gasket plate to the intake box.
d) Remove the four 5-16 nuts holding the burner tray in the boiler.
f) Carefully remove the burner assembly being careful not to damage the firedoor insulation or the manifold gasket.
3) Inspect the flue passages for signs of blockage. If there is any carbon in the combustion chamber or the flue passages, clean
the heat exchanger before proceeding further. See the cleaning procedure below.
4) Remove any debris found in the combustion chamber, being careful not to disturb combustion chamber insulation.
5) Inspect and clean the burners. Clean the burners by first brushing the ports with a soft bristle brush and then vacuuming out
any debris through the venturi opening. If burners show signs of deterioration, they should be replaced (some discoloration
around the burner ports is normal).
6) Inspect the pilot assembly. Clean any deposits found on the electrode and grounding strap. The ideal gap between the
electrode and the ground strap is 1/8”. Inspect the porcelain for cracks or other deterioration. Replace pilot assembly if
deterioration is found. Inspect the ignition cable insulation for cracks or other deterioration. If deterioration is found,
replace cable assembly.
7) Inspect the combustion chamber insulation for deterioration. Replace insulation if necessary.
8) Inspect all boiler wiring for loose connections or deterioration.
9) Inspect the vent system:
• Make sure that the vent system is free of obstructions.
• Make sure that all vent system supports are intact.
• Inspect joints for signs of condensate or flue gas leakage.
• Inspect venting components for corrosion or other deterioration. Replace any defective vent components.
10) Inspect the boiler and hydronic system for leaks.
11) Place the boiler back in operation using the procedure outlined in Part X. Check the pilot line and any other gas piping
disturbed during the inspection process for leaks.
CAUTION
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
CAUTION
Water leaks can cause severe corrosion damage to the boiler or other system components. Repair any leaks found
immediately.
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Heat Exchanger Cleaning Procedure
WARNING
Soot deposits in the flue passages are a sign that the boiler may be operating at high carbon monoxide (co) levels. After
cleaning the boiler of soot deposits, check the CO level in the flue gas to insure that the boiler is operating properly.
If it is necessary to check CO, use a combustion analyzer, or other instrument which is designed to measure CO in
flue gas. A CO “sniffer” designed for testing CO levels in ambient air cannot be used to check boiler combustion. Take
a flue gas sample by inserting a sample probe through the vent terminal. Do not take a sample until the boiler has
been firing for at least five minutes.
A normal CO reading for an CWD series boiler is less than 50ppm (0.005%). A reading of more than 100ppm
(0.01%) is indicative of a combustion problem.
Some causes of excessive CO include:
• Incorrectly sized or drilled burner orifice
• Partially plugged flue passages
• Improper manifold pressure
• Partial blockage of vent or intake system
• Foreign material in burner venturis or burner ports
• Missing regulator cover or disconnected regulator reference tube
• Damaged fan impeller or housing
• Damaged or missing fan gasket
• Leak in seal between flue collector and heat exchanger
• Distorted or missing combustion chamber floor
• Damaged base
• Flue gas leak in the concentric section of the coaxial terminal
1) Turn off electrical power and gas supply to the boiler.
2) Remove the burner tray. To do this:
a) Remove the intake cover.
b) Remove the four Allen head screws holding the elbow flange onto the gas valve.
c) Remove the three 10-32 screws holding the manifold gasket plate to the intake box.
d) Remove the four 5-16 nuts holding the burner tray in the boiler.
e) Carefully remove the burner assembly being careful not to damage the firedoor insulation or the manifold gasket.
3) Disconnect the vent system from the boiler by removing the four 10-32 screws holding the vent collar in place.
4) Remove the top jacket panel. If possible, remove the rear and left side jacket panels.
5) Unplug the fan and remove the fan cover plate.
6) Disconnect the pressure switch hoses.
7) Loosen the two ¼-20 nuts and washers in the flue collector lugs. Slide the flue collector lugs off of each flue collector flange.
8) Score the silicone seal around the flue collector with a utility knife or similar tool.
9) Pry the flue collector off of the heat exchanger, being careful not to damage the flue collector or fan.
10 Remove the stainless steel flue baffle from each flue passage.
11) Clean the flue passageways using a stiff bristle brush. Be certain that all foreign material is removed from the gaps between
the pins.
12) Clean the bottom surfaces of the heat exchanger.
13) Put a light in the combustion chamber and look through the flue passages from the top to verify that they have been
thoroughly cleaned.
14) Replace the flue baffles.
15) Apply a heavy (1/4”) bead of silicone with a temperature rating of at least 400F around the perimeter of the heat exchanger.
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16) Set the flue collector onto the block and press down so that the flue collector is set into the silicone applied in the previous
step.
17) Slide the flue collector lugs back into position and retighten the ¼-20 bolts. DO NOT OVER TIGHTEN.
18) Apply a bead of silicone around the outside of the joint between the heat exchanger and the flue collector.
19) Reattach all the jacket components.
20) Reconnect the pressure switch tubes (see Figure 46 for correct tubing orientation).
21) Reconnect the fan.
22) Reconnect the vent system.
23) Reinstall the burner tray.
Service Notes
1) Orifice Size – Sea level orifice sizes are:
Natural Gas – #50 Drill Size
LP Gas – Consult Factory
Consult your Crown representative for correct orifice sizes for use at altitudes above 2000 ft. Orifice for this boiler cannot
be drilled in the field.
2) Operating the Boiler with Intake Cover Removed – For inspection and troubleshooting purposes, this boiler may be started
and run with the intake cover removed. When this is done, a resonance (“hum”) may be observed. This is normal and
should disappear as soon as the intake cover is replaced.
WARNING
Do not leave the boiler in service with the intake cover removed.
3) Pressure Switch – This boiler is equipped with a differential pressure switch which makes when there is adequate flue gas
flow through the boiler. This switch measures the pressure drop across an orifice plate inside the flue collector - the higher
the flue gas flow through this plate, the higher the pressure drop. The N.O. contacts on the pressure switch make, allowing
the boiler to fire, when the pressure drop across the flue collector orifice plate switch exceeds the “make setting” shown in
Table 7. Once the switch is made, the boiler will fire as long as the pressure at the switch is above the “break setting” shown
in Table 7. The pressure at both pressure switch tappings is actually below atmospheric (“negative”) with the pressure at the
upper flue collector tap being the more negative of the two pressures. Figure 46a shows the pressure switch connections.
Figure 46b shows the correct method of reading the pressure across the pressure switch tappings. It is normal for the
pressure reading across the switch to drop as the boiler heats up.
4) Burner and Pilot Removal - If necessary, the pilot can be removed without removing the burner tray. To do so, remove the
screws holding the main burners on each side of the pilot bracket. The main burners will then be loose enough to allow the
pilot hood to slip between them.
Main burners cannot be removed without removing the burner tray from the boiler.
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TABLE 7: PRESSURE SWITCH SETTINGS
MAKE SETTING*
(inches w.c.)
BREAK SETTING*
ALTITUDE
SEA LEVEL - 5200 ft
ABOVE 5200 ft
CROWN PN
620009
(inches w.c.)
1.26
1.10
1.16
620010
1.00
*Settings shown are based on “plus tolerance” - actual setting may be lower.
FIGURE 46a: PRESSURE SWITCH CONNECTIONS
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FIGURE 46b: MEASURING PRESSURE ACROSS PRESSURE SWITCH
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XII Troubleshooting
The following pages contain troubleshooting charts for use in diagnosing control problems. If troubleshooting a CB502
control system, go to the box marked “Start” at the top of the chart on page 58 and follow the appropriate path though the chart
until a box with a list of possible causes is reached. If troubleshooting a R8285 control system, go to the box marked “Start”
at the top of the chart on page 62 and follow the appropriate path though the chart until a box with a list of possible causes is
reached.If the problem is known to be within the ignition system, go directly to the ingition system troubleshooting guide on
page 64. In using these charts, the following should be kept in mind:
1) These charts are only meant to be used by a professional heating technician as an aid in diagnosing control problems.
2) Where applicable, follow all precautions outlined in the appropriate lighting instructions on page 49.
3) In general, these charts assume that there are no loose or miswired electrical connections. Before using these charts, inspect
all electrical connections on the boiler to make sure that they are tight. Also, check the wiring on the boiler against the
appropriate wiring diagrams in the Wiring section.
4) The possible causes at the end of each branch in these charts are not listed in order of likelihood. All controls on the CWD
are tested at least once in the manufacturing process and a defective control or component is generally the least likely cause.
Before replacing a component, try to rule out all other possible causes.
5) If the charts indicate that the boiler transformer is defective, it is possible that this transformer has been destroyed by a short
circuit in the boiler wiring. Before replacing the transformer, carefully inspect all low voltage wiring on the boiler for places
where it is touching the frame of the boiler or wiring on the other side of the transformer.
6) If the charts indicate that one of the relays in the CB502 board or the R8285 are defective, it is possible that a second
transformer is present in the thermostat or zone valve circuit, resulting in the application of 48 volts across the relay coil. In
older buildings, this transformer may be hidden in a location far from the boiler. If this second transformer exists, it must be
found and removed before the relay is replaced.
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N
START
(No call for
heat from
Y
Call from
"HEAT 1"
zone
"HEAT 1"
Circulator
start?
"DHW/H2"
zone used?
PWR
LED On?
Y
Y
either zone)
N
N
Y
HEAT
LED On?
Y
24volts
transformer
secondary?
N
*Defective
transformer
harness
*Defective
CB502
120 volts
N
N
across red and
white circulator
leads?
N
24V across
"HEAT 1" T
and T
Y
120 volts across
black and white
transformer
Y
Y
primary leads ?
* Loose
N
"DHW
PRIORITY"
Switch on?
connection
between boiler
J-box circ.
* Defective
circulator
N
Y
* Power off
* Blown fuse or
tripped breaker
* Miswired or
loose electrical
connection in
120 volt line
* Loose connection in
t'stat or zone valve end
switch wiring
* Defective t'stat or zone
valve end switch
*Defective CB502
board
*Defective
"DHW/H2" relay
* T'stat or zone system
miswired-consult zone
valve or t'stat
* Defective
transformer.
manufacturer's
instructions.
*Defective CB502
board
* Defective "HEAT 1" relay
on CB502
* Relay not fully seated in
socket
TROUBLESHOOTING CHART FOR BOILERS WITH CB502 CONTROL SYSTEM (USING #42-502A BOARD)
PAGE 1 OF 4
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Call for heat
from
"DHW/H2"
zone
"DHW/H2"
circulator
start?
Y
Continued on
next page
N
N
Y
DHW
LED On?
Y
24V across
"DHW/H2" T
and T
N
Y
120 volts across
blue and white
circulator leads?
Defective
CB502 board
N
*Loose
connection
between boiler
J-box and circ
* Loose connection in
t'stat or zone valve end
switch wiring
* Defective t'stat or zone
valve end switch
* T'stat or zone system
miswired-consult zone
valve or t'stat
manufacturer's
instructions.
* Defective "DHW/H2"
relay on CB502
* Relay not fully seated
in socket
* Loose connection in
circulator wiring
TROUBLESHOOTING CHART FOR BOILERS WITH CB502 CONTROL SYSTEM (USING #42-502A BOARD)
PAGE 2 OF 4
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Continued
from previous
page
Y
Y
Y
Y
LIMIT
LED on?
PRESS
LED on?
Fan On?
N
N
N
FAN
LED on?
* Missing or loose
"RESET CONTROL"
jumper
*Missing or loose
"CN1" jumper
*Defective CB502
board
24V between
brown lead on
limit and yellow
lead on
N
N
transformer?
Y
* Boiler water
temp over L4080D
setpoint
*Defective L4080D
24 volts present
across yellow
transformer lead and
red lead on pressure
switch?
Y
24 volts present
across yellow
transformer lead and
purple lead on
N
pressure switch?
* Kinked or blocked
vacuum switch tubing
* Defective vacuum
switch
Unplug fan and
check for 120V
across H FAN
and N FAN on
CB502 board
N
Y
*Loose pressure
switch harness
*Defective CB502
board
Minimum
pressure at
switch called in
Table 7 present
across switch?
N
* Loose
Y
connection at
fan plug or fan
capacitor
120 volts
present?
Y
* Defective
*Tubes reversed on
pressure switch
*Leak in tubes at pressure
switch connection
capacitor
* Defective fan
N
*Loose pressure switch
harness connection
*Defective CB502 board
*Defective "FAN"
relay
*Defective CB502
board
TROUBLESHOOTING CHART FOR BOILERS WITH CB502 CONTROL SYSTEM (USING #42-502A BOARD)
PAGE 3 OF 4
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Do burners shut
down before
gauge temp
exceeds high limit
setting +15F?
Y
Wait 30
seconds
(prepurge)
Main
burners
light?
Y
Y
Pilot
light?
N
N
N
24 volts
between 24V
and
24V (GND) on
ign. module?
See "Intermittent
Ignition System
Troubleshooting
Chart" on page 64
Y
END
N
* Defective L4080D
* Sensing bulb not bottomed
out in well
Do burner,
circulator and
fan shut down at
end of call for
heat?
*Loose
harness
*Defective
CB502 board
Y
N
*Loose, leaking, blocked, or reversed
pressure switch tubes
*Leaks in flue collector joints
*Foreign object in fan or flue collector
* Blockage in venting system
* Vent system not installed in
accordance with installation manual
* Excessive silicone on I.D. of vent
system joints
Does boiler shut
down when t'stat
wire is removed from
t'sat terminal
N
* Damaged or missing fan gasket
* Defective fan
* Wind at horizontal vent terminal in
excess of 40 mph
Y
*Incorrect fan outlet orifice
* T'stat or zone system
calling for heat
* T'stat wires shorted
* Internal boiler wiring
problem, consult
Crown representative
TROUBLESHOOTING CHART FOR BOILERS WITH CB502 CONTROL SYSTEM (USING #42-502A BOARD)
PAGE 4 OF 4
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START
Induced
draft fan
start?
Wait 30
seconds
(prepurge)
Y
Y
Circulator
start?
N
N
Unplug fan and
check for 120 volts
across black and
white connections
on female half of
plug.
Thermostat
calls for heat
24volts across R
and C on R8285
fan center?
N
Y
Y
120 volts
present?
120 volts across
black and white
transformer
primary leads on
back of R8285 ?
24 volts across
G and C on
R8285 fan
center?
Y
N
N
* Loose
Y
Reconnect fan
connection at
fan plug or fan
capacitor
N
* Loose connection in
t'stat or zone valve end
switch wiring
* Power off
* Defective
capacitor
* Defective fan
* Defective t'stat or zone
valve end switch
* T'stat or zone system
miswired-consult zone
valve or t'stat
* Blown fuse or
tripped breaker
* Miswired or
loose electrical
connection in
120 volt line
24 volts
present across
yellow and
N
manufacturer's
instructions.
purple leads on
R8222?
* Defective
transformer.
Replace R8285.
24 volts present
across yellow
and orange
connections on
R8222?
N
Y
120 volts across
N
circulator
* Defective
R8222 relay
connections?
* Socket not fully
seated on relay
Y
* Defective relay on
R8285
* Relay not fully seated
in socket
* Loose connection in
circulator wiring
Y
* Kinked or blocked
pressure switch
tubing
* Defective pressure
switch
* Boiler off on
high limit
* Defective
L4080D
* Defective
circulator
TROUBLESHOOTING CHART FOR BOILERS WITH R8285 CONTROL SYSTEM - PAGE 1 OF 2
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END
Main
burners
light?
Y
Y
Do burners shut
down before
gauge temp
Pilot
light?
Y
exceeds high limit
setting +15F?
N
N
N
See "Intermittent
Ignition System
Troubleshooting
Chart" on page 64.
24 volts
between 24V
and
24V (GND) on
ign. module?
Y
Do burner,
circulator and
fan shut down at
end of call for
heat?
Y
* Defective L4080D
* Sensing bulb not bottomed
out in well
N
N
Does boiler shut
down when t'stat
wire is removed from
terminal R on
N
R8285?
Minimum
pressure at
switch called in
Table 7 present
across switch?
N
Y
* Blockage in venting system
* Vent system not installed in
accordance with installation manual
* Excessive silicone on I.D. of vent
system joints
Y
* Internal boiler wiring
problem, consult
Crown representative
* Blockage, condensate or leakage in
vacuum switch tubing
* Improperly sealed flue collector
* Damaged or missing fan gasket
* Defective fan
*Tubes reversed on
pressure switch
*Leak in tubes at pressure
switch connection
* T'stat or zone system
calling for heat
* T'stat wires shorted
*Loose pressure switch
harness connection
* Wind at horizontal vent terminal in
excess of 40 mph
TROUBLESHOOTING CHART FOR BOILERS WITH R8285 CONTROL SYSTEM - PAGE 2 OF 2
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START
IMPORTANT: ALL PILOT TROUBLESHOOTING
ON THIS CHART MUST BE PERFORMED AFTER
THE 30 SECOND PREPURGE HAS ENDED AND
BEFORE THE END OF THE 90 SECOND TRIAL
FOR IGNITION PERIOD.
(24 volts is present across 24V and 24V (GND) on
Ignition Module, 30 second prepurge period has
passed)
Pulsing
Spark
across
Does
Main
Y
Y
Y
Y
Pilot
lights?
spark stop
when pilot
lights?
burner
lights?
END
ignitor/sensor
gap?
N
N
N
N
24VAC
across
terminals MV
& MV/PV on
module?
N
24 volts
across
terminals PV
& MV/PV at
module?
N
Y
* Defective
module
Y
* Defective
module
* Module is in soft
lockout. Reset by
momentarily
interupting power to
boiler and waiting for
prepurge.
24 volts
between MV &
MV/PV on gas
valve?
24 volts
across PV &
MV/PV at gas
valve?
N
Y
* Break in spark
cable insulation
* Break in pilot
porcelain
N
Y
* Incorrect pilot
spark gap
* Loose connection
in spark cable
* Loose ground
connection
* Loose connection in
ignition cable or
ground wire
* Pilot electrode
porcelain cracked
* Pilot flame not
covering gap
* Defective EI
wiring harness.
*Defective EI
harness
* Defective Ignition
Module
between electrode
and grounding
strap
* Low inlet gas
pressure
* Low inlet gas pressure
* Plugged, kinked or leaking
pilot tubing
* Plugged pilot orifice
* Gas line not purged of air
* Defective pilot assembly
* Defective gas valve
* Defective
gas valve
* Defective module
TROUBLESHOOTING CHART FOR IGNITION SYSTEMS USING UT 1003-626A IGNITION MODULE
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XIII PARTS
The following parts may be obtained from any Crown distributor. To find the closest Crown distributor, consult the area
Crown representative or the factory at:
Crown Boiler Co.
Customer Service
P.O. Box 14818
Philadelphia Pa. 19134
Main burner orifice shown are for sea level configured boilers. For boilers installed at elevations above 2000 ft, consult the
local Crown representative or the factory for the correct main burner orifice.
In some cases, the following parts lists do not include Crown part numbers because they were not available at the time of
printing. Order these parts by their description, specifying the boiler model number on which they are to be used.
65
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BLOCK, BASE, FLUE COLLECTOR COMPONENTS
PART
# OR
QTY.
PART # OR QTY.
KEY DESCRIPTION
CWD060 CWD083 CWD110 CWD138 CWD165 CWD193 CWD220 CWD245
1
2
BASE
1
620113
4
620114
4
620115
4
620116
4
620117
4
620118
4
620119
4
620120
4
NYLON FEET (GLIDES)
700111
3
4
5
6
*
*
*
*
INTAKE BOX
1
620233
14
620234
14
620235
14
620236
14
620237
14
620238
14
620239
14
620240
14
1/4-20 X1/2 PAN HEAD SCREW
5/16-18 X 1 1/4 TAP BOLT
COMPLETE CAST IRON BLOCK ASSEMBLY
LEFT END SECTION
INTERMEDIATE SECTION
RIGHT END SECTION
900100
900101
1
620011
620006
620012
620008
2
2
2
2
2
2
2
2
620013
620014
620015
620016
620017
620018
620019
620020
1
1
1
4
1
2
1
6
1
3
1
8
1
4
1
1
5
1
1
6
1
1
7
1
1
8
1
PUSH NIPPLE
10
12
14
16
18
5/16-18 X 1 1/2 FULLY THREADED ZINC
PLATED STUDS
7
900425
4
4
4
4
4
4
4
4
8
9
10
5/16 USS FLAT WASHER
5/16-18 S,S HEX NUT
5/16-18 NYLON INSERT HEX NUT
3/4 X 1/4 BLACK IRON REDUCING
BUSHING
900102
90-010
900103
14
8
2
14
8
2
14
8
2
14
8
2
14
8
2
14
8
2
14
8
2
14
8
2
11
12
13
14
15
950017
1
1
1
1
1
1
1
1
3/4 IN BLACK IRON PLUG
95-048
35-
1010
1
2
2
2
2
2
2
2
2
3/4” HIGH LIMIT WELL
1
620143
1
1
620144
1
1
820145
1
1
620146
1
1
620147
1
1
620148
1
1
620149
1
1
620150
1
CWD DISTRIBUTOR PIPE
3/8-16 X 1 1/4 ZINC PLATED HEX HEAD
CAP SCREW
900452
16
17
18
19
20
21
22
23
24
25
26
27
28
29
*
30
31
32
33
34
35
36
FLUE BAFFLE
TINNERMAN NUT
10-32 X 1/8 I.D.HOSE BARB
10-32 HEX NUT
REAR FIREDOOR
REAR FIREDOOR INSULATION
1 1/4 CUP HEAD PIN
1 1/4 SELF LOCKING WASHER
1” CERAFELT SEALING STRIP
5/16-18 X 3/4 HEX CAP SCREW
FLUE COLLECTOR
FLUE COLLECTOR LUG
FAN GASKET
FAN ASSEMBLY
620100
90-217
90-222
90-219
1
2
10
3
3
620203
620533
4
3
10
3
3
620204
620534
4
4
12
3
3
620205
620535
6
5
12
3
3
620206
620536
6
6
12
3
3
620207
620537
6
7
12
3
3
620208
620538
6
8
12
3
3
620209
620539
6
9
12
3
3
620210
620540
6
1
900203
900200
4
4
6
6
6
6
6
6
900145 0.75 FT 1.05 FT 1.35 FT 1.65 FT 1.95 FT 2.25FT 2.55 FT 2.85 FT
900400
1
60-501
1
1
1
90-202
60-600
1
90-058
90-057
1
4
4
4
4
620126
2
650002
60-001
60-003
4
4
620127
2
650002
60-001
60-003
4
4
620128
2
650002
60-001
60-003
4
4
620129
2
650002
60-001
60-003
4
4
620130
2
650002
60-001
60-003
4
620123
2
620002
620001
620003
4
620124
2
620002
620001
620003
4
620125
2
620002
620001
620003
4
REPLACEMENT FAN CAPACITOR
1/4-20 HEX NUT
COLLAR GASKET
2
2
2
2
2
2
2
2
FAN OUTLET ORIFICE
10-32 X1/2 SLOTTED ROUND SCREW
#10 FLAT WASHER
COMB CHAMBER FLOOR
DISTRIBUT0R SCREEN
10-32 X1/2 SLOTTED HEX WASHER SCREW,
TYPE “F”, ZINC PLATED
INTAKE BOX INSULATION
INTAKE COVER
INTAKE COVER GASKET
SIGHT GLASS
SIGHT GLASS GASKET
SIGHT GLASS FRAME
#10 X 3/4 HEX HEAD TYPE “B” SCREW
3 “ VENT COLLAR
620133
6
650136
6
620135
6
620136
6
620137
6
620138
6
620139
6
650138
6
4
4
4
4
4
4
4
4
620223
620253
620224
620254
620225
620255
620226
620256
620227
620257
620228
620258
620229
620259
620230
620260
1
37
900155
25
31
37
43
49
55
61
67
38
39
40
41
42
43
44
45
45
*
1
1
1
620553
620213
620613
1
1
1
10
1
0
620554
620214
620614
1
1
1
10
1
0
620555
620215
620615
1
1
1
12
1
0
620556
620216
620616
1
1
1
12
1
0
620557
620217
620617
1
1
1
12
1
1
620558
620218
620618
1
1
1
12
1
1
620559
620219
620619
1
1
1
12
0
1
620560
620220
620620
1
1
1
12
0
1
60-052
60-056
60-055
90-054
60-603
60-604
90-045
4” VENT COLLAR
10.1 oz TUBE SILICONE SEALANT
1
1
1
1
1
1
1
1
* NOT PICTURED
66
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BURNER TRAY COMPONENTS
PART#
OR
PART # OR QTY.
KEY
DESCRIPTION
CWD060 CWD083 CWD110 CWD138 CWD165 CWD193 CWD220 CWD245
QTY.
1
50
51
52
53
54
55
56
56
56
56
57
58
59
FRONT FIREDOOR
620543
620523
620544
620524
620545
620525
620546
620547
620548
620528
620549
620529
620550
620530
FRONT FIREDOOR INSULATION
INSULATION SUPPORT BRACKET
MICA SIGHT GLASS
1/8 ALUMINUM POP RIVET
BURNER MANIFOLD
#49 ORIFICE (SEA LEVEL, NAT GAS)
#50 ORIFICE (SEA LEVEL, NAT GAS)
#56 ORIFICE (SEA LEVEL, LP GAS)
#57 ORIFICE (SEA LEVEL, LP GAS)
MANIFOLD GASKET
MANIFOLD GASKET PLATE
3/4” 90 DEGREE FLANGE
HONEYWELL VR8204C2328 GAS VALVE
(NAT GAS)
HONEYWELL VR8304P2342 GAS VALVE
(NAT GAS)
HONEYWELL VR8204P2294 GAS VALVE
(LP GAS)
HONEYWELL VR8304P3522 GAS VALVE
(LP GAS)
1
620526
620527
620101
60-050
90-068
1
950305
950306
950331
950332
60-151
60-150
35-1055
2
1
2
2
1
2
2
1
2
2
2
4
1
2
4
1
2
4
1
2
1
1
2
2
620153
620154
620155
620156
620157
620158
620159
620160
4
0
4
0
1
1
1
0
6
0
6
1
1
1
0
8
0
8
1
1
1
0
10
0
0
12
0
0
14
0
14
1
0
16
0
16
1
0
18
0
18
1
10
1
12
1
1
1
1
1
1
1
1
1
1
1
60
60
60
60
3507400
3507410
3507405
3507245
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
61
62
63
1/8” GAS VALVE HOSE BARB HW#394537 35-1060
1
4
1
1
6
1
1
8
1
1
10
1
1
12
1
1
14
1
1
16
1
1
18
1
BECKETT GAS BURNERS
PILOT BRACKET
150620
150625
Q3481B1131 PILOT ASSEMBLY (NAT GAS)
- INCLUDES IGNITION CABLE
Q3481B1149 PILOT ASSEMBLY (LP GAS)
- INCLUDES IGNITION CABLE
64
64
3504100
3504105
1
1
1
1
1
1
1
1
65
66
30” X 1/8” PILOT TUBING
IGNITION GROUND HARNESS
90-043
9601101
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
146-95-
301
67
68
69
70
70
10-32 X 3/16 HEX HEAD PILOT SCREW
1
1
1
1
1
1
1
1
1/8 SHORT FERRULE (INCLUDED WITH
GAS VALVE)
1/8 LONG FERRULE (INCLUDED WITH
PILOT ASSY.)
KF24 PILOT ORIFICE (NAT GAS) -
INCLUDED WITH PILOT ASSY.
K14 PILOT ORIFICE (LP GAS) -
INCLUDED WITH PILOT ASSY.
35-1600
35-1650
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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JACKET COMPONENTS
PART # OR QTY
PART#
OR
QTY
KEY DESCRIPTION
CWD060 CWD083 CWD110 CWD138 CWD165 CWD193 CWD220 CWD245
80
81
82
83
84
85
86
87
88
89
90
91
92
VESTIBULE PANEL
LARGE PLASTIC BUSHING
FAN COVER PLATE
#10 X 1/2 SHEET METAL SCREW
LH JACKET PANEL
RH JACKET PANEL
REAR JACKET PANEL
PLASTIC BUSHING
CONTROL PANEL
TOP JACKET PANEL
CWD FRONT JACKET PANEL
DOOR KNOB
1
620323
620324
620325
620326
620327
620328
620329 620330
960051
1
90-212
620301
620300
1
96-050
620350
1
1
1
1
1
1
1
1
1
620302
31
1
1
620303
2
1
620323
620323
2
620302
31
1
1
620304
2
1
620324
620324
2
620302
32
1
1
620305
2
1
620325
620325
2
60-300
31
1
1
620306
2
1
620326
620326
2
60-300
34
1
1
620307
2
1
620327
620327
2
60-300
36
1
1
620308
2
1
620328
620328
2
60-300
60-300
36
1
36
1
1
1
620309 620310
2
1
2
1
620329 620330
620329 620330
1
90-210
90-211
2
2
2
2
8-32 X 1/4 MACH. SCREWS
2
2
2
2
2
2
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COMMON CONTROLS & TRIM
PART#
OR
PART # OR QTY
KEY DESCRIPTION
CWD060 CWD083 CWD110 CWD138 CWD165 CWD193 CWD220 CWD245
QTY
14-008
35-3300
95-069
3503062
905000
9601100
96-055
*
1/8” SILICONE TUBING
HONEYWELL L4080D LIMIT
TRIDICATOR GAUGE
UT IGNITION MODULE 1003-626A
MODULE BRACKET
2.5 FT
2.5 FT
2.5 FT
2.5 FT
2.5 FT
2.5 FT
2.5 FT
2.5 FT
100
101
102
103
*
1
1
1
0
1
1
1
1
1
0
1
1
1
1
1
0
1
1
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
INTERMITTENT IGNITION HARNESS
4X4 JUNCTION BOX
104
SEA LEVEL PRESSURE SWITCH (ALL
SIZES)
PRESSURE SWITCH (AS NEEDED ABOVE
5200FT)
105
105
620009
620010
1
1
1
1
1
1
1
1
106
111
112
113
114
115
116
117
118
119
120
*
#8 X1/2 SHEETMETAL SCREWS
1 1/2 X 1 1/4 BLACK 90 DEGREE ELBOW
ISOLATION FLANGE SET
TACO 007 CIRCULATOR
3/4” X 5” NIPPLE
3/4” 90 DEGREE ELBOW
3/4” CLOSE NIPPLE
3/4” ASME RELIEF VALVE
3/4” X 4 1/2” NIPPLE
900130
950200
95-061
95-012
95-044
95-057
95-105
95-040
95-102
95-056
95-041
9601630
2
1
1
1
1
1
1
1
1
1
1
0
2
1
1
1
1
1
1
1
1
1
1
0
2
1
1
1
1
1
1
1
1
1
1
0
2
1
1
1
1
1
1
1
1
1
1
0
2
1
1
1
1
1
1
1
1
1
1
0
2
1
1
1
1
1
1
1
1
1
1
0
2
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
3/4” COUPLING
3/4” BOILER DRAIN
CWD FAN EXTENSION HARNESS
CONTROLS UNIQUE TO CB502 CONTROL SYSTEM
PART#
OR
PART # OR QTY
CWD060 CWD083 CWD110 CWD138 CWD165 CWD193 CWD220 CWD245
KEY DESCRIPTION
QTY
107
108
109
*
CB502A RELAY BOARD
REPLACEMENT RELAY FOR CB502A
RESET PLUG FOR CB502A
42-502A
42-503
42-504
1
1
3
1
1
3
1
1
3
1
1
3
1
1
3
1
1
3
1
1
3
1
1
3
1
HIGH VOLTAGE HARNESS
96-1005 96-1005 96-1005 96-1005 96-1006 96-1006 96-1006 96-1006
9601620 9601620 9601620 9601620 9601625 9601625 9601625 9601625
9601635 9601635 9601635 9601635 9601635 9601635 9601635 9601635
*
*
110
CWD/CB502 TRANSFORMER HARNESS
CWD LOW VOLTAGE HARNESS
TRANSFORMER-AT72D1006
1
1
35-2100
1
1
1
1
1
1
1
1
CONTROLS UNIQUE TO R8285 CONTROL SYSTEM
PART#
OR
PART # OR QTY
KEY
DESCRIPTION
CWD060 CWD083 CWD110 CWD138 CWD165 CWD193 CWD220 CWD245
QTY
1
*
*
*
CWD/R8285 HARNESS #1
CWD/R8285 HARNESS #2
BWF HARNESS #4
9601600 9601600 9601600 9601600 9601605 9601605 9601605 9601605
9601610 9601610 9601610 9601610 9601615 9601615 9601615 9601615
9601120 9601120 9601120 9601120 9601120 9601120 9601120 9601120
1
1
121
122
123
R8285D5001 FAN CENTER
R8222U1006 RELAY
R8222 MOUNTING PLATE
3505555
3505556
620102
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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Appendix A: Special Requirements For Side-Wall Vented Appliances
In The Commonwealth of Massachusetts
IMPORTANT
The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for
installation of side-wall vented gas appliances as follows:
1. For direct-vent appliances, mechanical-vent heating appliances or domestic hot water equipment, where
the bottom of the vent terminal and the air intake is installed below four feet above grade the following
requirements must be satisfied:
a. If there is not already one present, on each floor level where there are bedroom(s), a carbon
monoxide detector and alarm shall be placed in the living area outside the bedroom(s). The carbon
monoxide detector shall comply with NFPA 720 (2005 Edition).
b. A carbon monoxide detector shall be located in the room that houses the appliance or equipment
and shall:
i. Be powered by the same electrical circuit as the appliance or equipment such that only one
service switch services both the appliance and the carbon monoxide detector;
ii. Have battery back-up power;
iii. Meet ANSI/UL 2034 Standards and comply with NFPA 720 (2005 Edition); and
iv. Have been approved and listed by a Nationally Recognized Testing Laboratory as recognized
under 527 CMR.
c. A product-approved vent terminal must be used, and if applicable, a product-approved air intake
must be used. Installation shall be in strict compliance with the manufacturer’s instructions. A copy
of the installation instructions shall remain with the appliance or equipment at the completion of the
installation.
d. A metal or plastic identification plate shall be mounted at the exterior of the building, four feet
directly above the location of the vent terminal. The plate shall be of sufficient size to be easily read
from a distance of eight feet away, and read “Gas Vent Directly Below”.
2. For direct-vent appliances, mechanical-vent heating appliances or domestic hot water equipment, where
the bottom of the vent terminal and the air intake is installed above four feet above grade the following
requirements must be satisfied:
a. If there is not already one present, on each floor level where there are bedroom(s), a carbon
monoxide detector and alarm shall be placed in the living area outside the bedroom(s). The carbon
monoxide detector shall comply with NFPA 720 (2005 Edition).
b. A carbon monoxide detector shall :
i. Be located in the room that houses the appliance or equipment
ii. Be either hard-wired or battery powered or both; and
iii. Comply with NFPA 720 (2005 Edition)
c. A product-approved vent terminal must be used, and if applicable, a product-approved air intake
must be used. Installation shall be in strict compliance with the manufacturer’s instructions. A copy
of the installation instructions shall remain with the appliance or equipment at the completion of the
installation.
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CROWN
Manufacturer of Hydronic Heatings Products
P.O. Box 14818 3633 I. Street
PN 980060
CWDMANV4
04/09
Philadelphia, PA 19134
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