Energy Recovery Ventilator
Model ERV
• Commercial • Institutional
• 400 to 12,000 cfm
• 1.5 in. wg external
static pressure
June
2010
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Model ERV
How does an energy recovery wheel work?
The basic objectives for providing acceptable indoor air quality (IAQ) are to
control indoor contaminates levels while maintaining desired indoor air
temperature and humidity. Compliance with the prescribed ventilation rates
in ASHRAE Standard 62 appear to satisfy the contaminant issue. However,
simply increasing outdoor air (OA) requirements with “traditional” HVAC
systems may not address the humidity issue properly and often leads to
significant energy cost increases.
0.20
0.25
0.30
0.35
0.40
SENSIBLE HEAT RATIO = Qs / Qt
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
170
160
150
140
130
120
110
100
90
0.45
0.50
80
80
0.55
0.60
75
75
70
The best solution for most commercial and institutional facilities
will include an enthalpy wheel product. The enthalpy wheel
70
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.65
0.70
transfers temperature and moisture properties from one
65
65 0.75
0.80
airstream to another. The result is capturing the cooling and
heating energy before it leaves the HVAC system.
80
0.85
60
60
0.90
70
0.95
55
1.00
55
50
60
Moving through the unit, the return and supply airstreams
50
50
pass on opposite sides of a divider panel. The
45
45
40
enthalpy wheel rotates between the airstreams
transferring up to 75% of the energy
40
40
35
30
35
30
30
present in the exhaust airstream to
the supply.
25
20
25
20
20
15
10
10
10
0
5
0
-5
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
DRY BULB TEMPERATURE - °F
Enthalpy Wheel
Filters
Supply Air to Building
Outdoor Air Weatherhood
Outdoor Air
Utilizing an enthalpy wheel to precondition the outdoor air,
narrows the operational range of outdoor air conditions
which the building’s HVAC equipment is designed to
temper. It is this reduction in the outdoor air range that
allows for size reduction in heating and cooling equipment
and reduced energy costs.
Supply
Blower
Exhaust Blower
Return Air From Building
Filters
Exhaust Weatherhood
Exhaust Air
Certifications
ERV’s construction is matched with extensive in-house testing and third-party verification of
performance and safety.
Greenheck certifies that the ERV models shown herein are licensed
Licensed to bear the AMCA seal for
Air Performance
to bear the AMCA seal. The ratings shown are based on tests and
procedures performed in accordance with AMCA Publication 211 and
comply with the requirements of the AMCA Certified Ratings Program.
Unit is ETL Listed — all internal electrical
components are factory wired to a single-point
power connection
Every unit is tested at the factory before it is shipped to the job site.
Energy recovery wheels are certified by the ARI Air-to-Air Energy
Recovery Ventilation Equipment Certification Program in accordance
with ARI Standard 1060. Actual performance in packaged equipment
may vary. Certified ratings are available in the Certified Product
aspx
ARI Standard 1060 certified energy wheel
performance assures the ERV model will function
as required in demanding environments
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What is the Benefit with
Greenheck Energy Recovery?
For the Building Owner
• Improved Indoor Air Quality (IAQ)
Introducing fresh, outdoor air to a building is a key component to sustaining excellent indoor air quality.
Outdoor air can be very expensive to heat and cool, but the ERV unit can provide an economical approach to
delivering outdoor air into a building.
• Energy Savings = Quick Payback
The energy recovery unit provides energy savings throughout the year. In the summer, the energy recovery
unit removes heat and moisture out of the outdoor air, but in the winter, heat and moisture are added back into
the fresh airstream. When you combine the energy savings from summer and winter operation, they lead to a
very fast payback period. In most parts of the United States, the payback is less than 2 years!
Equipment Reduction Using Energy Recovery on 3000 cfm Outdoor Air
Cooling
Equipment
Reduction
(tons)
Annual
Summer
Cooling
Savings
Heating
Equipment
Reduction
(MBH)
Annual Winter
Heating
Approximate
Payback
Gas Price* Electric Cost**
Savings
(Years)***
Boston, MA
Minneapolis, MN
St. Louis, MO
Raleigh, NC
Houston, TX
Tampa, FL
1.68
1.14
1.34
1.48
1.10
1.59
1.21
1.13
0.1495
0.0712
0.0558
0.073
8.72
9.55
12.1
11.3
13.0
13.1
4.17
9.40
226
161
356
424
1701
1779
2
161
217
173
138
111
89
4544
3261
3088
2790
1089
988
0.78
0.88
0.35
0.57
0.22
0.21
2.34
1.95
0.1011
0.0974
0.071
Portland, OR
Phoenix AZ
123
161
2930
1478
0.0766
271
*
Average gas price (dollars per therm) per region in the first six months of 2007 (source: Energy Information Administration)
** Average electricity cost (dollars per kWh) in March of 2007 (source: Energy Information Administration)
*** Assumptions: $3/cfm energy recovery cost; $650/ton avoided cooling equipment cost; 75.6% effective energy wheel; 12 hrs/day 5 days/week operation
For the Maintenance Personnel
• Low Maintenance Equipment
Energy Wheel: The most important component in the ERV is the energy wheel.
This device should be inspected and cleaned as necessary, which will vary by
application and environment. Any cleaning that is required is simplified by the
easy accessible wheel with removable segments. Cleaning requires no special
equipment (light detergent and water) and can be performed in a location that is
convenient to you.
Fans: The blowers that are used in the ERV are centrifugal, forward-curved- type
fans. These fans come with easily adjustable pulleys, belt tension bolts and
permanently sealed bearings.
Filters: The 2-inch, 30% efficient MERV 8 filters that are included with the unit are
designed for easy access and removal.
• Quality Construction
Greenheck has focused on the manufacturing and unit designs to create well-
constructed equipment. Investments in automated manufacturing processes
provide accurate and repeatable results, giving excellent part fit and unit strength.
Incorporation of innovative designs add to the quality, while keeping maintenance
work simple to perform.
• Long-Lasting Equipment
Because of our high-quality construction, the equipment that goes to the field is made to last. As reassurance
to the customer, each ERV unit carries a 1-year warranty from the ship date and the wheel components
(segments, cassette, belt, and pulleys) carry a 5-year warranty.
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What is the Benefit with
Greenheck Energy Recovery?
For the Design Engineer
• Adhering to ASHRAE Guidelines
ASHRAE Standard 90.1 provides design guidelines regarding when it is most beneficial to use energy
recovery. Depending upon your geographic location and the percentage of outdoor air in the application,
ASHRAE recommends when to use energy recovery. An important part of this guideline is that when energy
recovery is recommended, the device should be a minimum of 50% total (sensible and latent) effectiveness
according to ARI 1060 testing procedure.
ASHRAE Standard 189.1 provides high performing building design guidelines. This requires even higher energy
recovery device performance than Standard 90.1. When energy recovery is recommended, the device shall be
a minimum 60% total (sensible and latent) effectiveness according to ARI 1060 testing procedure.
• LEED Certification Credits
For Green Building designs, the ERV offers an excellent way to acquire credits in both
Energy and Atmosphere (EA) and Indoor Environmental Quality (EQ) categories towards a
LEED certification.
Prepared to Support
Green Building Efforts
• CAPS Program
CAPS is Greenheck’s comprehensive product selection program. The CAPS program was
developed with ease of use and fast selections in mind. There is also useful information
available for making selections and educating people who are new to energy recovery
technology. CAPS also provides submittals which includes unit overview, electrical
information, fan charts, arrangements, engineering drawings, payback information, and
psychrometric processes.
• CSI Specifications
After a unit has been selected in CAPS, an accurate unit specification is available for use in the job
specification. These specifications have been recently updated to the CSI format.
• Industry Certification
To ensure performance on the job site, Greenheck emphasizes the need for the 3 major industry certifications
for energy recovery units: AMCA Licensed for Air Performance, ETL Listed for safety, and ARI Certification on
the energy recovery wheel.
For the Contractor
• Easy Installation
- Lifting Lugs
Lifting Lugs
- Single-Point Power
- Bolt-doors for limited clearance applications
These are just a few of the built-in features to make the installation process quick and easy. Our
comprehensive Installation, Operation, and Maintenance Manuals are also available online, so the information
you need is quick and easy to obtain.
• Product Approval
Form, fit and function, the ERV was designed to operate in commercial and institutional applications. With over
a decade of installations specific to the energy recovery market, Greenheck’s energy recovery product line is
well known and accepted throughout the industry.
• 1 — 5-Year Warranty
Our 1-year unit warranty and 5-year energy recovery wheel warranty lets you to rest easy knowing that we
stand behind our product.
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Accessories
Low-Leakage Dampers — Internally mounted for
Roof Curbs
both supply and exhaust
For a cohesive fit between
Where code requires low-leakage
the ERV and your building,
dampers they can be provided to keep
the cold weather out in the winter,
or hot and humid weather out during
the summer. Since the dampers are
wired to a single-point power source,
a simple run command sent to the
unit powers the dampers open. When your unit is off
during unoccupied hours, the dampers close to keep
the outdoor air out.
Greenheck offers a pre-
engineered curb design. They
are available with duct adaptors
to simplify field duct installation
and get the unit up and running more quickly.
Double Wall Construction
The supply and exhaust side are internally lined with
20 gauge galvanized steel.
Filters
Weatherhoods
Standard size 2-inch pleated, medium efficiency filters
and filter racks are available for supply and/or exhaust
airstreams.
A louvered intake hood with 2-inch aluminum mesh
filters and exhaust hood with an integral backdraft
damper are available.
Model
Filter Size Quantity
ERV-251
ERV-361
ERV-521
ERV-581
ERV-522
16 x 25
16 x 20
16 x 25
16 x 20
16 x 25
1
2
3
6
7
Hinged Access Doors
Panel side doors are a standard feature on all
units. Hinged access doors are available on models
ERV-361, -521, -581, -522, and -582. Access doors
are removable hinge type with lift and turn latches for
access to internal components.
All dimensions shown in inches.
Remote Panel
Air Filtration — High-Efficiency Filters
With the optional remote panel you have control and
the information you want. Monitoring lights, on/off
time-clock control, or on/off/auto switch are a few of
the available options. So whether you want to control
the unit operation via a 7-day time clock or simply
want to monitor unit performance, the remote panel is
the option that you’ll need.
Unit is standard with 2-inch, MERV 8,
30% efficient filters. Optional MERV 13,
85% efficient filters are available to help
meet additional LEED requirements or
simply improve indoor air quality.
Painted Exterior
For added aesthetics and a
long-lasting finish, Greenheck
offers many different paint
DESERT
SAND
PERMATECTOR™
options. Pre painted coatings
in either Gray or Desert Sand
offer economical options in customizing your unit. If
a more specific color is desired, we also offer a wide
variety of colors to meet your specific needs.
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Accessories
Dirty Filter Sensors
CO2 Sensor
Filters require scheduled maintenance to improve
air quality and system efficiency. A dirty filter sensor
A good indicator for building health is
carbon dioxide (CO2). Greenheck offers a
allows you to minimize maintenance frequency to only CO2 sensor, that can be used to engage
when it is needed. The dirty filter kit senses when
the filters are dirty and sends a signal to our built-in
control center. Greenheck offers an optional remote
control panel and a “clogged filter” light to tie the
signal into.
the unit based on CO2 levels, or it can
increase or decrease airflows through
the use of a variable frequency drive
(VFD) on the blowers. The CO2 sensor
can be unit mounted or space mounted
depending on your application.
Rotation Sensor
Service Outlet
Adding a wheel rotation sensor to the unit assures
you that the energy wheel is operating properly. The
sensor sends a signal to the control center of the
unit in the rare event that the wheel stops rotating.
While performing minimal maintenance on your ERV, a
service outlet can provide power when and where it’s
needed. Shipped loose, the outlet can be mounted in
Greenheck offers an optional remote control panel and the correct location for your building.
a “wheel rotation” light to tie the signal into.
Vapor-Tight Lights
Factory Mounted Sensors
Access doors provide natural lighting during the day,
Amp Draw, Pressure, Temperature: Greenheck offers
factory mounted sensors that are wired back to the
control center, so you can get the information you
need to know, exactly where you need to measure
it. These sensors can be used to simply monitor unit
operation or to actively control the unit with controls
by others.
but there may be times when more light is needed
to see properly inside the unit. To increase bulb life
and to also protect the bulb, Greenheck offers a
vapor-tight light.
Blower VFD’s
Variable frequency drives are a great
tool to control airflow to the space
or to maintain duct pressures. With
this optional feature, two VFD’s are
utilized, one per fan for independent
and flexible control.
Amp Monitor
Blower amp draw can be monitored
through the use of an amperage
sensor. These sensors allow for
either an analog or digital output
based on your system needs.
Wheel Pressure Sensors
In each airstream, a pressure
sensor is available to monitor
wheel operation. Wheel pressure
can be used to indicate a buildup
of frost during the cold winter
months or can be used as a CFM
gauge as the energy wheel is a
laminar flow device (i.e. a specific
pressure equals a specific CFM).
Temperature Sensors
Wheel performance can be
determined with factory mounted
temperature sensors. Every
compartment can be monitored to
know how your unit is operating.
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Accessories
Economizer Control (Free Cooling)
Take advantage of cool outdoor air to handle space loads. A call for cool air is sent to the unit’s control center
which triggers one of a few different options to bring in fresh cool air:
Energy Wheel On/Off
The wheel cycles off when it’s in the free cooling range (temperature or enthalpy), and
cycles on when outdoor air is too warm or too cold. This option is recommended when the
air is being supplied to an air handling unit or duct heater, and not directly to the space.
Energy Wheel Modulation
The wheel speed modulates to maintain a 55°F discharge temperature. Above 55°F,
the wheel is off up to a high-limit temperature setting (typically 70°F). This option is
recommended when the air is supplied directly to the space from the ERV or when more
precise temperature control is needed.
Frost Protection
Cold climates, in combination with higher indoor humidity levels, may cause frost to form on the energy wheel
during normal operation. To protect against frost, we measure the outdoor temperature and the energy wheel
pressure drop. When it’s cold enough and the wheel pressure is increasing, the wheel is frosting. Only then will
the frost methods described below engage. See the “Frost Control Strategy Recommendations” chart on this
page for which of the three Greenheck frost methods we recommend for your building.
Timed Exhaust Frost Control
The supply blower cycles on and off based on a
factory provided timer. With the supply blower
off, the warm exhaust air melts the frost. Once the
wheel pressure decreases, the supply blower turns
back on.
Frost Control Strategy Recommendations
Recommended
Winter Outside Air
Design
Winter Indoor Air
Design
Frost Control
Strategy
Modulating Wheel Frost Control
≥ 10°F (-12.2°C)
≤ 50% RH
≤ 35% RH
≤ 50% RH
≤ 35% RH
Any RH
None
≥ -5°F (-20.6°C) <
10°F (-12.2°C)
A factory installed variable frequency drive (VFD)
slows the wheel down making it less effective.
In other words, the slow rotating wheel spends
enough time in the warm exhaust airstream to melt
the frost. Once the wheel pressure decreases,
it returns to full speed. Both blowers operate
continuously during this frost mode. Modulating
wheel frost control is available on all sizes except
the ERV-251.
Timed Exhaust
≥ 10°F (-12.2°C)
≥ -5°F (-20.6°C) <
10°F (-12.2°C)
Electric Preheat
≥ -5°F (-20.6°C)
Preheat Frost Control
An electric preheater is built into the ERV outdoor air intake. When frost occurs, the heater engages, and
increases the outdoor air temperature above the frost threshold to melt the wheel. Once the pressure
decreases, the heater shuts off.
The map at left indicates the frost control
options, if any, that are appropriate based
on climactic conditions during typical
16 hour per day operation.
Preheat Frost Control Recommended*
Timed Exhaust Frost Control Recommended*
No Frost Control Needed
*Modulating Wheel Frost Control can also be used in these areas.
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Arrangements
Top View
Interior
Supply Air
This compact design is ideal for the space limitations
that routinely complicate interior installations.
Arrangement A
Specify Arrangement A for interior mounting. All ERV
sizes are available in this arrangement. Fig. 1 is typical
for ERV-251, -361, -521, and -581.
Exhaust Air
Fig. 1
Arrangement A - Interior Mounted
Exterior
Where roof mount or pad mount installations are
preferred, Greenheck offers three arrangements to
provide the flexibility to simplify system design and
installation. Louvered intake hood and an exhaust hood
are standard on Arrangements B, C and D. The housing
and hood design minimize re-entrainment of exhaust
air.
Top View
Arrangement B
Ideal for roof mount installations where both exhaust and
supply ducts penetrate the roof deck and attach to the
bottom of the energy recovery ventilator. Fig. 2 is typical
for ERV-251, -361, -521, and -581.
Supply
Air
Exhaust Air
Arrangement C
Ideal for roof mount installations where the supply
airstream is to be routed directly into a rooftop HVAC
Exhaust
Hood
Fig. 2
Intake Hood
unit. Exhaust air enters the ERV from below.
Arrangement B - Roof Mounted
Arrangement D
Suited for pad mounting, where both the exhaust and
supply ducts connect to the end of the ERV.
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Dimensions
ERV-251, ERV-361, ERV-521, ERV-581
Exterior Dimensions
Duct Dimensions
Weight
(lbs.)
340
860
1290
1470
Model
A
B
C
D
E
8
15
15
22
F
G
K
63⁄4
83⁄8
103⁄4
16
L
7
111⁄2
131⁄2
183⁄4
Q
P
ERV-251
ERV-361
ERV-521
ERV-581
46
62
67
75
34
51
67
70
27
34
44
67
12
18
16
16
10
18
24
22
16
18
24
27
10
19
26
28
16
18
26
48
All dimensions shown are in inches. Weight assumes outdoor unit with filters, weatherhoods, and supply damper.
Arrangement A
Arrangement B
Outdoor Air Discharge
L x K
Outdoor Air Discharge
L x K
B
A
Exhaust Air Inlet
F x G
Outdoor Air Inlet
Q x P
D
C
C
E
Exhaust Air Inlet
F x G
A
B
Exhaust Air Discharge
L x K
Intake Hood
Exhaust Hood
Arrangement C
Arrangement D
Outdoor Air Discharge
L x K
Outdoor Air Discharge
L x K
B
A
B
A
D
D
C
C
E
E
Exhaust Air Inlet
F x G
Exhaust Air Inlet
F x G
Intake Hood
Intake Hood
Exhaust Hood
Exhaust Hood
Service Clearance
Model
Exhaust Side
Supply Side
Installation must allow clearance for access to the energy
recovery wheel on the supply side. Minimum clearances
are shown in the table at right. Page 4 shows the side
panel that enables wheel access.
ERV-251
ERV-361
ERV-521
ERV-581
30
30
40
40
32
44
60
65
All dimensions shown are in inches.
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Dimensions
ERV-522 and ERV-582
Exterior Dimensions
Model
Duct Dimensions
Weight
(lbs.)
A
ERV-522S 124
ERV-522H 124
ERV-582H 146
B
C
D
16
E
19
F
G
H
J
K
L
185⁄8
22
Q
P
84
84
97
64
64
77
48
48
60
25
25
28
26
26
31
36
36
38
16
19
23
60
60
70
25
25
30
3230
3230
3700
16
171⁄2
19
263⁄4
25
All dimensions shown are in inches. Weight assumes outdoor unit with filters, weatherhoods, and supply damper.
Arrangement A
Arrangement B
Outdoor Air Discharge
L x K
Exhaust Air Inlet
H x J
Outdoor Air Discharge
L x K
Exhaust Air Inlet
Outdoor Air Inlet
Q x P
F x G
C
C
E
A
A
D
Exhaust Air Discharge
L x K
B
Intake Hood
B
Exhaust Hood
Arrangement C
Arrangement D
Outdoor Air Discharge
L x K
Exhaust Air Inlet
H x J
Outdoor Air Discharge
L x K
Exhaust Air Inlet
F x G
C
C
E
E
A
A
D
D
Intake Hood
Intake Hood
B
B
Exhaust Hood
Exhaust Hood
Service Clearance
Model
ERV-522
ERV-582
Exhaust Side
Supply Side
The installation must allow clearance for access to
the energy recovery wheels and servicing. Minimum
clearances are shown in the table at right. Model ERV-
522 and ERV-582 energy wheels are mounted in an
upright position, side by side. For servicing, the energy
wheels slide out of the ventilator at opposite corners.
38
42
38
42
All dimensions shown are in inches.
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Performance
Supply and Exhaust - Belt and Direct Drive
Greenheck Fan Corporation certifies that the
The airflow performance data shown
applies to arrangement A and is licensed to
bear the AMCA Seal for Air Performance.
Performance data for other arrangements
may differ slightly.
ERV models shown herein are licensed to bear
the Air Performance AMCA seal. The ratings
shown are based on tests and procedures
performed in accordance with AMCA Publication
211 and comply with the requirements of the
AMCA Certified Ratings Program.
For specific performance for all arrangements,
use Greenheck’s Computer Aided Product
Selection (CAPS) program.
NOTES:
All models are available in A, B, C, and
D arrangements.
1. Performance tables show EXTERNAL
static pressure capabilities.
2. Bhp, watt and amp values shown are for
one blower motor only.
ERV-251S (Standard Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
Nominal
RPM
Max Amps Max. Watts
115/230
(input)
0.25
0.375
0.50
0.625
0.75
1.00
1.25
950
1150
1350
3.0/1.5
300
563
536
498
450
378
CFM
5.3/2.7
8.6/4.3
530
855
700
834
680
818
658
801
634
783
597
762
513
711
642
ERV-251H (High Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
Nominal
RPM
Max Amps Max. Watts
115/230
(input)
0.25
0.375
0.50
0.625
0.75
1.00
1.25
1150
1340
1520
5.0/2.5
500
802
777
742
706
667
CFM
8.1/4.1
810
958
937
915
887
857
792
954
11.5/5.8
1150
1089
1070
1051
1032
1008
895
ERV-361S (Standard Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
CFM
1000
1200
1400
1600
OV
0.125
777
0.250
863
0.375
941
0.50
1015
0.33
1109
0.48
1212
0.68
1323
0.95
0.75
1147
0.41
1232
0.58
1324
0.80
1424
1.07
1.00
1277
0.49
1343
0.68
1429
0.92
1520
1.20
1.25
1397
0.58
1453
0.78
1527
1.03
1613
1.34
1.50
1515
0.69
1557
0.87
1618
1.14
1701
1.47
FRPM
BHP
1495
1794
2093
2392
0.21
899
0.25
974
0.29
1043
0.43
1153
0.64
1269
0.89
FRPM
BHP
0.34
1023
0.52
1149
0.75
0.39
1091
0.58
1212
0.82
FRPM
BHP
FRPM
BHP
ERV-361H (High Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
CFM
1600
1800
2000
2200
OV
0.125
1006
0.58
1119
0.82
1232
1.11
1347
1.46
0.250
1065
0.64
1172
0.88
1279
1.17
1389
1.53
0.375
1122
0.69
1223
0.93
1326
1.23
1433
1.60
0.50
1175
0.74
1272
0.99
1372
1.30
1474
1.67
0.75
1275
0.86
1365
1.12
1458
1.43
1555
1.81
1.00
1367
0.96
1452
1.25
1541
1.58
1633
1.97
1.25
1457
1.07
1533
1.36
1618
1.72
1.50
1542
1.19
1613
1.49
1692
1.85
FRPM
BHP
2392
2691
2990
3289
FRPM
BHP
FRPM
BHP
FRPM
BHP
Gross supply air performance ratings (airflow, pressure, and power) are at port 2 with port 1, port 3 and port 4 at 0.0 in. wg. Gross exhaust air
performance ratings (airflow, pressure, and power) are to port 3 with port 1, port 2 and port 4 at 0.0 in. wg. Power rating (Bhp) does not include drive
losses. Performance ratings do not include the effects of appurtenances in the airstream.
12
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Performance
Supply and Exhaust - Belt Drive
ERV-521S (Standard Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
CFM
2,200
2,700
3,200
OV
0.125
830
0.25
881
0.375
933
0.50
981
0.75
1072
1.09
1203
1.75
1345
2.65
1.00
1155
1.25
1278
1.93
1412
2.86
1.25
1238
1.41
1350
2.12
1477
3.08
1.50
1315
1.57
1416
2.30
FRPM
BHP
2,183
2,679
3,175
0.72
998
0.80
1040
1.38
1203
2.21
0.87
1081
1.47
1240
2.32
0.95
1124
1.57
1274
2.43
FRPM
BHP
1.29
1168
2.11
FRPM
BHP
ERV-521H (High Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
CFM
3,100
3,700
4,300
OV
0.125
980
0.25
1017
1.65
1187
2.72
1361
4.20
0.375
1054
1.73
0.50
1089
1.82
1249
2.92
1415
4.43
0.75
1159
1.99
1309
3.12
1467
4.65
1.00
1226
2.18
1367
3.33
1519
4.89
1.25
1290
2.36
1425
3.55
1569
5.13
1.50
1355
2.54
1480
3.77
FRPM
BHP
3,076
3,671
4,267
1.57
1156
2.62
1334
4.08
FRPM
BHP
1219
2.83
FRPM
BHP
1388
4.31
ERV-522S (Standard Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
CFM
5,000
5,750
6,500
OV
0.125
754
0.25
794
2.39
892
3.49
991
4.90
0.375
831
0.50
869
0.75
943
1.00
1011
3.54
1087
4.81
1164
6.33
1.25
1072
3.89
1146
5.26
1222
6.89
1.50
1134
4.30
1201
5.67
1276
7.41
FRPM
BHP
2,416
2,779
3,141
2.20
855
2.57
924
2.76
957
3.15
1022
4.33
1108
5.88
FRPM
BHP
3.28
956
3.70
1021
5.15
3.92
1049
5.39
FRPM
BHP
4.67
ERV-522H (High Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
CFM
6,000
7,500
9,000
OV
2,067
2,584
3,100
0.125
535
0.25
581
0.375
619
0.50
660
0.75
731
1.00
797
1.25
857
1.50
913
FRPM
BHP
1.57
646
1.79
686
1.96
722
2.16
753
2.55
818
2.94
877
3.33
930
3.72
983
FRPM
BHP
2.90
763
3.20
794
3.46
827
3.68
857
4.17
910
4.66
964
5.12
1016
7.60
5.62
1063
8.18
FRPM
BHP
4.90
5.20
5.57
5.89
6.42
7.01
ERV-581H (High Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
CFM
4,300
5,050
5,800
OV
0.125
637
0.25
687
1.35
774
2.05
866
2.99
0.375
733
0.50
772
1.61
855
2.39
939
3.38
0.75
850
1.00
923
1.25
988
1.50
1055
2.73
1111
3.65
1177
4.83
FRPM
BHP
2,064
2,424
2,784
1.20
731
1.49
817
1.88
922
2.16
989
2.42
1053
3.33
1120
4.44
FRPM
BHP
1.89
826
2.23
903
2.68
1004
3.74
3.00
1061
4.07
FRPM
BHP
2.79
3.18
ERV-582H (High Airflow)
EXTERNAL STATIC PRESSURE (in. wg)
CFM
9,000
OV
0.125
595
0.25
629
3.95
713
5.99
800
8.66
0.375
661
0.50
692
4.54
769
6.74
849
9.56
0.75
746
1.00
797
1.25
843
1.50
888
7.09
952
9.74
FRPM
BHP
2,254
2,630
3,005
3.61
685
4.26
741
5.25
820
5.89
867
6.48
911
FRPM
BHP
10,500
12,000
5.60
776
6.38
825
7.44
897
8.27
941
9.03
982
FRPM
BHP
8.24
9.12
10.36
11.19
12.13
Gross supply air performance ratings (airflow, pressure, and power) are at port 2 with port 1, port 3 and port 4 at 0.0 in. wg. Gross exhaust air
performance ratings (airflow, pressure, and power) are to port 3 with port 1, port 2 and port 4 at 0.0 in. wg. Power rating (Bhp) does not include drive
losses. Performance ratings do not include the effects of appurtenances in the airstream.
13
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Selection Guidelines
Motor Specifications
Blower motor information
must be specified to select
unit. The horsepower,
voltage, phase and enclosure
availability is presented
in the table on the right. If
exhaust and supply blower
horsepower are different,
consult the CAPS program.
Open
TE
Two Speed Open
Model
115/1 230/1 230/460/3 230/1 230/460/3 230/1 230/460/3
1
1
1
1
ERV-251S*
⁄
4
⁄
4
-
-
-
-
-
ERV-251H*
ERV-361*
ERV-521*
ERV-581*
ERV-522*
ERV-582*
⁄2
⁄2
-
-
-
-
-
1
1
1
1
1
1
1
1
1
1
-
-
-
-
-
⁄
4
- 2
- 3
-
⁄
4
- 2
- 5
⁄
4
- 2
- 11⁄2
⁄
4
- 2
- 5
⁄
2
2
- 1
- 1
-
⁄
1
2
- 11⁄2
1
⁄2
⁄
2
⁄2
⁄2
⁄
⁄
2
- 3
1 - 5
-
11⁄2
-
1 - 5
1 - 15
1 - 15
1 - 3
11⁄2 - 3 11⁄2 - 15
11⁄2 - 15
-
1 - 71⁄2
1 - 71⁄2
-
-
UL Listing is available on most open drip proof motors.
*Energy wheel drive motor is only available with open drip proof motors.
Minimum Circuit Amps (MCA) Calculations for ERV Units
Wheel drive, 24 volt internal control amp and standard electric preheat kW. Single or three phase ERV units
24v
Control
Amps
Wheel Drive Amps
115 208/230 460
Standard Electric Preheat kW
Model
115/1 208/1 230/1
208/3
230/3
460/3
NA
ERV-251 0.6
ERV-361 NA
0.6
1.2
NA
0.6
0.5
1
2.5 2.1, 4.1 2.5, 5
NA
NA
NA
NA
NA
NA
NA
NA
4.1, 8.2, 12.3 5, 10, 15
8.2, 12.3,
5, 10, 15
ERV-521 NA
2.8
1.4
1
10, 15, 19 10, 15, 20, 25, 30
15.5
ERV-581 NA
ERV-522 NA
1.6
5.6
3.2
0.8
2.8
1.6
1
1
1
NA
NA
NA
NA
NA
NA
NA
NA
NA
12.3, 15.5
15, 19
19
15, 20, 25, 30, 38
20, 25, 30, 45
20, 38, 50
15.5
ERV-582 NA
15.5, 24.5
19, 30
NA = not available
MCA Example Calculation
Greenheck ERV selected: ERV-361S-B, 2 hp
supply motor, 11⁄2 hp exhaust motor, 15kW
preheater operating at 460 volt, three phase.
Filter Pressure Drop
Intake Hood
Pleated
2-inch
filters
with 2-inch
aluminum
Model
CFM
Step 1: Consult NEC table (not shown) for 2 hp
supply motor amps = 3.4 A
Step 2: Consult NEC table (not shown) for 11⁄2 hp
filters
500
1,000
1,000
2,200
2,500
4,500
4,500
5,500
6,000
9,000
9,000
12,000
0.09
0.32
0.09
0.45
0.13
0.45
0.17
0.30
0.15
0.40
0.13
0.45
0.09
0.19
0.10
0.28
0.14
0.32
0.15
0.24
0.14
0.25
0.16
0.27
ERV-251
ERV-361
ERV-521
ERV-581
ERV-522
ERV-582
exhaust motor amps = 2.6 A
Step 3: Calculate 15kW preheater amp draw =
15,000W/ [460 * 3 ] = 18.8 A
If no preheater is used skip step 3
Step 4: Wheel drive amps for ERV-361 from
table above = 0.6 A
Step 5: 24v Control Amps for ERV-361 from
table above = 1.0 A
Step 6: MCA = Amperage total from steps
1 thru 5 x 1.25
MCA = (3.4 + 2.6 + 18.8 + 0.6 + 1.0)
1.25 = 33 A
Note: Calculations are approximate, use our Computer Aided Product Selection (CAPS) program for exact
MCA calculations.
14
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Typical Applications
The ERV unit can add to the benefit of a building design anywhere that outdoor air is required and the exhaust
air is considered “clean” (ASHRAE class 1 or class 2 air ratings). Some examples of commercial and institutional
applications where energy recovery units have been utilized are given below.
Animal Shelters
Locker Rooms
Restaurants
Bars and Clubs
Nursing Homes
Schools
Churches
Dormitories
Printing Shops
Casinos
Office Buildings
Function Halls
Veterinary Hospitals
With Ducted Air Handlers
The ERV unit may be combined with ducted air handling units or fan coil boxes. A single energy recovery
ventilator may provide fresh outdoor air for multiple air handling units or in a one-to-one ratio where a single
energy recovery ventilator and air handler serve one space.
SUPPLY AIR
OUTDOOR AIR UNIT (OA unit)
WITH ENERGY RECOVERY
AIR HANDLING
UNIT (AHU)
AHU
Heating
Coil
Heating
Coil
Energy
Wheel
Cooling
Coil
Cooling
Coil
OUTDOOR
AIR
72°F
50%
72°F
50%
Exhaust
Fan
ZONE 1
ZONE 2
EXHAUST AIR
RESTROOM
RELIEF AIR
With Packaged Rooftop Equipment
RESTROOM
This diagram illustrates how energy recovery
ventilators may be used in conjunction
with packaged rooftop equipment. Fresh,
outdoor air enters the energy recovery
ventilator and is pretreated before entering
the heating/cooling equipment. This
pretreating occurs because the energy
recovery wheel is transferring latent and
sensible energy between the outdoor air and
the building exhaust air.
ZONE 1
72°F
50%
EXHAUST
AIR
Exhaust
Fan
AIR HANDLING
UNIT (AHU)
Energy
Wheel
Supply
Fan
SUPPLY AIR
ENERGY RECOVERY
VENTILATOR (ERV)
Heating Cooling
Coil
Coil
15
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Greenheck’s Energy
Recovery Models
Model MiniVent - Energy Recovery Ventilator
The MiniVent-450 & 750 are energy recovery ventilators
used for commercial and institutional applications that
require 300 to 800 cfm of ventilation air. The compact
design provides an economical solution for individual
spaces, such as school classrooms and small offices.
Model ERH - Energy Recovery with Heating
With the ERH, you save money with the total energy wheel
and get the convenience of supplemental heating. The ERH
provides preconditioned air in the summer and space neutral
air in the winter, which is ideal if your climate has prominent
summer and winter seasons. The heating section further
tempers cold outdoor air to desired conditions. Four housing
sizes available with airflow capacities up to 10,000 cfm and
external static pressures up to 1.5 in. wg.
Model ERCH - Energy Recovery with Cooling and Heating
The model ERCH combines the benefits of the total energy wheel with
supplemental cooling and heating. The result is a product that is specifically
designed to process 100% outdoor air to desired supply conditions. Four housing
sizes provide airflow capacities from 1,000 to 10,000 cfm with external static
pressures up to 1.5 in. wg. A variety of tempering options are available. The coil
section of the ERCH accommodates a cooling coil, a heating coil, or both.
Model VER - Versatile Energy Recovery (VersiVent)
The Model VER is a fully featured, versatile energy recovery unit with a wide
range heating and cooling options available. The unit includes an
energy wheel to pre temper the outdoor air which reduces the heating
and cooling equipment needed, while also lowering operational costs.
In addition to the standard heating and cooling options, the VersiVent
has options such as environmentally friendly R410 refrigerant, a wrap-
around heat pipe for additional dehumidification and reheat capacity,
and a quiet, efficient, plenum supply fan. Capacities range from 2,000 to
10,000 cfm with external static pressures up to 3.0 in. wg.
Model APEX - Affordable, Practical, Energy Exchanger
The model APEX combines high airflow capacities with cost saving energy
recovery ventilation by providing centralized outdoor air distribution and
reducing the need for multiple unit installations. Fresh outdoor air is
preconditioned by the total enthalpy wheel, which recovers a majority of
the energy from the exhaust air. It saves 3-4 tons of cooling per 1,000 cfm
and saves 50-60 MBH of heating per 1,000 cfm. Easy to install and operate
with airflow capacities from 10,000 to 20,000 cfm and external static
pressures up to 2.5 in. wg.
Our Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one
year from the shipment date. The energy recovery wheel is warranted to be free from defects in material
and workmanship for a period of five years from the shipment date. Any units or parts which prove defective
during the warranty period will be replaced at our option when returned to our factory, transportation
prepaid. Motors are warranted by the motor manufacturer for a period of one year. Should motors furnished
by Greenheck prove defective during this period, they should be returned to the nearest authorized motor
service station. Greenheck will not be responsible for any removal or installation costs.
Prepared to Support
Green Building Efforts
As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specifications without notice.
00.TAP.1000 R7 6-2010 SN
P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck.com
Copyright © 2010 Greenheck Fan Corp.
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