Form No. 7510
(Rev. 6/05)
Bryan “Flexible Water Tube”
AB Series
Steam & Water Boilers
900,000 to 3,000,000 BTUH
Forced draft gas, oil or dual fuel fired
Water Boiler
AB120-W-FDGO
Steam Boiler
AB250-S150-FDG
®
BRYAN BOILERS
Originators of the “Flexible Water Tube” design
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Guaranteed efficiency and easy
maintenance assure low cost operation
All Bryan AB Series boilers offer these operating and performance features
Guaranteed efficiency
per HP. Needing only 24" for tube removal, and on only
one side of the boiler, the AB Series boiler occupies very
littlespaceintheboilerroom. Thiscanresultinconsider-
able savings in building costs. Pressurized firing permits
minimum sized breaching and vent.
The breakthrough in water tube boiler design that pro-
duced the AB Series provides operating efficiency so
reliable, weguaranteeittobe83.5%forhotwaterboilers
and 82% - 15 PSI / 80% - 150 PSI or better for steam.
Multi-pass flue gas travel
The Bryan Flexible Tube
High velocity four-pass flue gas travel is obtained by a
uniquebafflingsystem.Thiscontributestomaximumfire
side heat transfer and overall high boiler efficiencies.
Bryan’s exclusive “Flexible Tube” design
eliminates the possibility of damage
from so-called “thermal
shock.”Tubesareeasilyre-
movable and replaceable,
without welding or rolling,
eliminatinglong,expensive
downtime should repairs
ever be required.
Thermal blend water return
Bryan’s unique “thermal blend” return blends cold or
cooler return water with warmer boiler water abridging it
todesignoperatingtemperatures.Aninjectortubedirects
the “mixed” water flow through the downcomer to the
lowerheaderandheatingsurfacesatatemperatureabove
possiblecondensingconditions.Thisreducesthepossi-
bilityof“coldspots”and
Water cooled furnace
The configuration of the
Water
Boiler
Steam
Boiler
damage from corrosive
condensation.
water tubes provides a
water cooled combustion
chamber. A high percent-
age of the heating surface is exposed to direct radiant
heat, increasing water velocities and heat transfer.
Positive internal
circulation
Each pass of the Bryan
Large steam drum
water tube slopes up-
ward.Thisconfiguration,
The steam drum has generous water volume and steam
release area. This design, along with effective drum
internal functions, results in a stable water level and
produces extremely dry steam at all load conditions.
along with the large
volume downcomer
water legs, provides the
extremely rapid natural
Accessibility of furnace and tube area
thermal internal circula-
tion, promoting both high
efficiency of heat transfer and
uniform temperature throughout the
boiler. Eliminating stress damage caused
Inner panel provides easy and complete access to fur-
nace and boiler tube area, as well as to burner head. All
panels are heavily insulated and sealed to boiler frame.
All access is from only one side.
Compact design, minimum floor space
by unequal temperature distribution is especially
important for heating systems, particularly where inter-
mittentorcontinuouslowtemperaturewaterreturnsmay
be encountered.
With our compact water tube design, the overall size
of the unit is less than most other types of boilers, yet
maintains a full five square feet of heating surface area
Hot water boiler
Bryan AB Series Boilers Standard and Optional Equipment
Optional construction to ASME
Power Boiler Code requirements for
temperaturesexceeding240°Fand/or
pressure exceeding 160 psi to maxi-
mum of 285° F operating and 300° F
design temperature and 250 psi.
STANDARD EQUIPMENT FURNISHED
OPTIONAL EQUIPMENT,
EXTRA COST
Water boiler
air safety switch, control panel, all
controls installed and wired.
1. Manual reset high limit control
2. Manual reset low water cutoff
3. Auxiliary low water cutoff
4. Combination low water cutoff
and feeder
Combination thermometer and alti-
tude gauge, ASME Code rated boiler
reliefvalve,watertemperaturecontrol
(240°F max std.), high limit control,
probe LWCO.
Straight oil fired unit
Electroniccombustionsafetycontrol,
dualoilvalvesoilignitiontransformer,
two-stage fuel unit, direct spark
ignition of oil, oil nozzle assembly,
control panel, all controls installed
and wired.
When ordering, please specify:
1. Boiler size
5. Alarm bells or horns
Steam boiler
6. UL, CUL, CSD-1, FM, IRI or
other insurance approved
control systems
2. Supply and return tempera-
Steam pressure gauge, steam pres-
sure control, combination low water
cutoff and pump control, auxiliary
low water cutoff, high limit pressure
control, ASME-rated safety valve,
water glass set.
tures required
3. Boiler relief valve setting
7. Indicating lights, as desired
8. Lead-lag systems for two or
more boilers with or without
outdoor reset control
Combination gas-oil unit
4. Type of fuel: natural, LP, or
other gas and/or No. 2 oil
Electroniccombustionsafetycontrol,
automaticoperatinggasvalve,safety
gas valve, pilot solenoid valve, pilot
ignition assembly, main manual gas
shut-off valve, pilot cock, pilot and
main gas pressure regulators, air
safety switch, manual fuel selector
switch, dual oil valves, gas pilot for
bothfuels,two-stagefuelunit,nozzle
assembly, control panel, all controls
installed and wired.
5. If gas, type, BTU content,
specific gravity and pressure
available
9. Draft control system
10. Low NOx package
Straight gas fired unit
6. Electric power voltage, phase
Electronic combustion safety con-
trol, automatic operating gas valve,
safety gas valve, pilot solenoid valve,
pilot ignition assembly, main manual
gas shut-off valve, pilot cock, pilot
and main gas pressure regulators,
and frequency
OPTIONAL CONSTRUCTION
7. Optional extra equipment or
construction
Steam boiler
OptionalconstructiontoASMEPower
BoilerCoderequirementsforpressure
exceeding150psitomaximumof300
psi design pressure.
8. Special approvals required
(UL, CUL, CSD-1, FM, or IRI)
9. Altitude
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Bryan AB Series Steam & Hot Water Boilers
STEAM BOILER DIMENSIONS — inches (cm)
A
B
C
D
E
F
G
H
I
J
K
L
Supply
Boiler
Model
Length Width Height
Gas Train
Connection
(Approx.)
Clearance for Min. Tube Floor to
Overall
Length
Return
Conn.
Flue
Size
Flue
Nozzle
of
Outside Over
Servicing
Burner
Removal
Flow
Location
Number
Jacket Jacket Jacket
15 psi
150 psi
Clearance Nozzle
4415/16
381/2
771/4
76
11/4
4 FLG
(10.16)
3 NPT
(7.62)
11/2 NPT
(3.81)
11/2 NPT
(3.81)
11/2 NPT
(3.81)
11/2 NPT
(3.81)
11/2 NPT
(3.81)
11/2 NPT
(3.81)
10
(25.4)
12
(30.5)
36
(91.4)
24
(60.9)
795/8
AB-90
AB-120
AB-150
AB-200
AB-250
AB-300
(114.1)
(97.79) (196.21) (193.0)
(3.2)
(202.24)
543/16
381/2
771/4
853/8
11/4
4 FLG
(10.16)
3 NPT
(7.62)
10
(25.4)
12
(30.5)
36
(91.4)
24
(60.9)
795/8
(137.6)
(97.79) (196.21) (216.8)
(3.2)
(202.24)
631/2
381/2
771/4
943/4
11/2
6 FLG
(15.24)
3 NPT
(7.62)
10
(25.4)
12
36
(91.4)
24
(60.9)
795/8
(161.3)
(97.79) (196.21) (260.7)
(3.8)
(30.5)
(202.24)
7815/16
381/2
771/4
110
2
(5.1)
6 FLG
(15.24)
3 NPT
(7.62)
10
(25.4)
161/2
36
(91.4)
24
(60.9)
795/8
(200.5)
(97.79) (196.21) (279.4)
(41.9)
(202.24)
947/16
381/2
771/4
1251/2
2
(5.1)
6 FLG
(15.24)
3 NPT
(7.62)
12
(30.5)
15
(38.1)
36
(91.4)
24
(60.9)
795/8
(239.9)
(97.79) (196.21) (318.8)
(202.24)
10813/16
(276.4)
381/2
771/4
14015/16
2
(5.1)
6 FLG
(15.24)
3 NPT
(7.62)
12
(30.5)
15
(38.1)
36
(91.4)
24
(60.9)
795/8
(97.79) (196.21) (358.0)
(202.24)
WATER BOILER DIMENSIONS — inches (cm)
A
B
C
D
E
F
G
H
I
J
K
L
Boiler
Model
Length
of
Width
Outside
Jacket
Height
Over
Gas Train
Connection
(Approx.)
Clearance for
Servicing
Burner
Min. Tube Floor to
Removal Flow
Overall
Length
Supply
Nozzle
Return
Nozzle
Flue
Size
Flue
Location
Number
Jacket
Jacket
Clearance Nozzle
4415/16
(114.1)
343/4
691/2
(176.5)
76
(193.0)
11/4
3-F
(7.6)
3-F
(7.6)
10
(25.4)
12
(30.5)
36
(91.4)
24
(60.9)
747/8
(190.2)
AB-90
AB-120
AB-150
AB-200
AB-250
AB-300
(88.3)
(3.2)
543/16
343/4
691/2
853/8
11/4
3-F
(7.6)
3-F
(7.6)
10
(25.4)
12
(30.5)
36
(91.4)
24
747/8
(137.6)
(88.3)
(176.5)
(216.8)
(3.2)
(60.9)
(190.2)
631/2
343/4
691/2
943/4
11/2
3-F
(7.6)
3-F
(7.6)
10
(25.4)
12
36
(91.4)
24
(60.9)
747/8
(161.3)
(88.3)
(176.5)
(260.7)
(3.8)
(30.5)
(190.2)
7815/16
343/4
691/2
110
2
(5.1)
3-F
(7.6)
3-F
(7.6)
10
(25.4)
161/2
36
(91.4)
24
(60.9)
747/8
(200.5)
(88.3)
(176.5)
(279.4)
(41.9)
(190.2)
947/16
343/4
691/2
1251/2
2
(5.1)
3-F
(7.6)
3-F
(7.6)
12
(30.5)
15
(38.1)
36
(91.4)
24
(60.9)
747/8
(239.9)
(88.3)
(176.5)
(318.8)
(190.2)
10813/16
(276.4)
343/4
(88.31)
691/2
(176.5)
14015/16
(353.0)
2
(5.1)
3-F
(7.6)
3-F
(7.6)
12
(30.5)
15
(38.1)
36
(91.4)
24
(60.9)
747/8
(190.2)
Specifications subject to change without notice. Consult factory to consult on other boiler options.
Bryan Steam LLC — Leaders Since 1916
783 N. Chili Ave., Peru, Indiana 46970 U.S.A.
Form No. 7510
©2005 Bryan Steam LLC
Printed in USA
65-7097
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