Greenheck Fan Energy Recovery Ventilator Erv Users Manual

Energy Recovery Ventilator ERV ERV_catalog

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2015-02-09

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Energy Recovery Ventilator
Model ERV
• Commercial

• Institutional

• 400 to 12,000 cfm
• 1.5 in. wg external
static pressure

June

2010

Model ERV
Greenheck’s model ERV provides fresh outdoor air to your building and is designed for operation in all climates.
This unit incorporates innovative design features with options in energy wheel performance to provide a quality
constructed unit with performance flexibility. The flexibility and reliability of these units means the ERV will fit
seamlessly into your building to improve your indoor air quality while saving energy and costs.

Design Features:
1

Louvered intake
weatherhood lowers
supply air intake
velocities to prevent
rain and snow from
being pulled in to the
unit. Each hood has
washable aluminum
mesh prefilters blocking
debris or leaves.

3
4

2
1

2-inch outdoor and
return air filters with a
MERV 8 (30% efficiency)
rating and are set into
filter racks that permit
easy change out and
rigid support.

Pitched roof and
interlocked standing
seams eliminates
standing water
and provides
rigid construction.

18 gauge outer wall construction is available in
many alternate coatings. Optional double-wall
construction protects insulation from moisture
and prevents insulation fibers from entering the
airstream. Insulation is 3 lb/ft³ density.

Integral lifting lugs are included for easy
maneuvering and installation of the unit.

Slide out energy wheel design allows for easy
access to the energy wheel.

Multiple energy wheel options allow selection of a
unit by what is critical in the design or application:
• Effectiveness
• Recovery Efficiency Ratio (RER)
• Low blower horsepower

Additional Features
• Quiet running, forward-curved blowers

• Neoprene isolation on blower assembly to
minimize sound and vibration transmission

• Adjustable motor pulleys for final
system balancing

• Bolt-on door design allows for fit in tighter
spaces. Optional hinged access is available for
roof mount applications.

• Factory provided motor starters and
disconnect switch in a sealed control center

Model ERV
How does an energy recovery wheel work?
0.20

0.25
0.30
0.35
SENSIBLE HEAT RATIO = Qs / Qt
55

170

160

0.90

IDIT

ATIV

REL

70
55

50
50
45
40
40
30

35
30

MIDITY

2%
65

0
100

105

110

115

0.70
0.65
0.75
0.60
0.80
0.85
0.90

1.00

0.55
0.50
0.45

0.40
0.35
0.30

0.25
0.20
0.15

25
20

0.75

0.70

0.95

0.80
ENTHALPY - BTU PER POUND OF DRY AIR

DEW POINT TEMPERATURE - °F

0.65

VAPOR PRESSURE - INCHES OF MERCURY

LATIVE

HUMIDITY RATIO - GRAINS OF MOISTURE PER POUND OF DRY AIR

20%

0.10

35
0.05

120

DRY BULB TEMPERATURE - °F

Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com

30%

10% RE

%
80

0.60

°°FF

90
%
20

1.00

0.85

SENSIBLE HEAT RATIO = Qs / Qt

IR
YA
DR
OF
ND
OU
RP

We
W
ett B
Buulb
lb,,
SSaatu
turra
atitio
onn
TTeem
mpp
--

PE
TU
-B
PY

AIR

. DRY

R LB

T. PE

-5

CU.F

-10

12.0

-5

110

ME-

VOLU

-°

100

0.55

120

14.0

130

0.50

0.95

80
75

1.05

150

140

13.0

Moving through the unit, the return and supply airstreams
pass on opposite sides of a divider panel. The
enthalpy wheel rotates between the airstreams
transferring up to 75% of the energy
present in the exhaust airstream to
the supply.

1.10

0.45

85
80

The best solution for most commercial and institutional facilities
will include an enthalpy wheel product. The enthalpy wheel
transfers temperature and moisture properties from one
airstream to another. The result is capturing the cooling and
heating energy before it leaves the HVAC system.

0.40

1.15

15.0

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.

Enthalpy Wheel
Filters

Supply Air to Building

Outdoor Air Weatherhood

Outdoor Air

Supply
Blower

Return Air From Building

Exhaust Blower

Filters

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.

Exhaust Weatherhood

Exhaust Air

Certifications
ERV’s construction is matched with extensive in-house testing and third-party verification of
performance and safety.
Licensed to bear the AMCA seal for
Air Performance

Greenheck certifies that the ERV models shown herein are licensed
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.

ARI Standard 1060 certified energy wheel
performance assures the ERV model will function
as required in demanding environments

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
Directory at http://www.ahridirectory.org/ahridirectory/pages/home.
aspx

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!

Gas Price*
Boston, MA
Minneapolis, MN
St. Louis, MO
Raleigh, NC
Houston, TX
Tampa, FL
Portland, OR
Phoenix AZ

1.68
1.14
1.34
1.48
1.10
1.59
1.21
1.13

Equipment Reduction Using Energy Recovery on 3000 cfm Outdoor Air
Cooling
Annual
Heating
Annual Winter
Equipment
Summer
Equipment
Electric Cost**
Heating
Reduction
Cooling
Reduction
Savings
(tons)
Savings
(MBH)
0.1495
8.72
226
161
4544
0.0712
9.55
161
217
3261
0.0558
12.1
356
173
3088
0.073
11.3
424
138
2790
0.1011
13.0
1701
111
1089
0.0974
13.1
1779
89
988
0.071
4.17
2
123
2930
0.0766
9.40
271
161
1478

Approximate
Payback
(Years)***
0.78
0.88
0.35
0.57
0.22
0.21
2.34
1.95

* 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 wellconstructed 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.

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

- Single-Point Power

Lifting Lugs

- 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.

Accessories
Low-Leakage Dampers — Internally mounted for
both supply and exhaust

Roof Curbs
For a cohesive fit between
the ERV and your building,
Greenheck offers a preengineered curb design. They
are available with duct adaptors
to simplify field duct installation
and get the unit up and running more quickly.

Where code requires low-leakage
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.

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.
Model

Filter Size

Quantity

ERV-251

16 x 25

ERV-361

16 x 20

ERV-521

16 x 25

ERV-581

16 x 20

ERV-522

16 x 25

A louvered intake hood with 2-inch aluminum mesh
filters and exhaust hood with an integral backdraft
damper are available.
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.

Air Filtration — High-Efficiency Filters

Remote Panel

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.

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.

Painted Exterior
For added aesthetics and a
long-lasting finish, Greenheck
desert
Permatector™
offers many different paint
sand
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.

Accessories
Dirty Filter Sensors

CO2 Sensor

Filters require scheduled maintenance to improve
air quality and system efficiency. A dirty filter sensor
allows you to minimize maintenance frequency to only
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.

A good indicator for building health is
carbon dioxide (CO2). Greenheck offers a
CO2 sensor, that can be used to engage
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.
Greenheck offers an optional remote control panel and
a “wheel rotation” light to tie the signal into.

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
the correct location for your building.
Vapor-Tight Lights

Factory Mounted Sensors

Access doors provide natural lighting during the day,
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.

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.

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.

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

Modulating Wheel Frost Control
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.

Winter Outside Air
Design

Winter Indoor Air
Design

Recommended
Frost Control
Strategy

≥ 10°F (-12.2°C)

≤ 50% RH

None

≥ -5°F (-20.6°C) <
10°F (-12.2°C)

≤ 35% RH

Timed Exhaust

≥ 10°F (-12.2°C)

≤ 50% RH

≥ -5°F (-20.6°C) <
10°F (-12.2°C)

≤ 35% RH

≥ -5°F (-20.6°C)

Any RH

Electric Preheat

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.

Arrangements
Interior

Top View

This compact design is ideal for the space limitations
that routinely complicate interior installations.

Supply Air

Arrangement A
Specify Arrangement A for interior mounting. All ERV
ExhaustFig. 1
Air
sizes are available in this arrangement.
is typical
for ERV-251, -361, -521, and -581.

Exhaust Air

Supply
Air

Fig. 1

Exhaust
Hood

Arrangement A - Interior Mounted

Intake Hood

Top View

Duct

Exterior
Supply Air

Where roof mount or pad mount installations are
preferred, Greenheck offers three arrangements to
Exhaust Air
provide the flexibility to simplify system design and
installation. Louvered intake hood and an exhaust hood
Exhaust
are standard on Arrangements B, C and
HoodD. The housing
and hood design minimize re-entrainment of exhaust
Intake Hood
air.

Top View

Arrangement B

Duct

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.

Arrangement C

Exhaust Air

Ideal for roof mount installations where the supply
airstream is to be routed directlyExhaust
into a rooftop HVAC
unit. Exhaust air enters the ERV Hood
from below.

Fig. 2

Intake Hood

Supply
Air

Exhaust Air

Supply Air

Exhaust
Hood
Intake Hood

Arrangement B - Roof Mounted
Top View

Duct

Arrangement D
Suited for pad mounting, where both the exhaust and
supply ducts connect to the end of the ERV.
Supply Air
Exhaust Air
Exhaust
Hood
Intake Hood

Top View

Duct

Dimensions

ERV-251, ERV-361, ERV-521, ERV-581
Model

Exterior
B
34
51
67
70

A
46
62
67
75

ERV-251
ERV-361
ERV-521
ERV-581

Dimensions
C
D
27
12
34
18
44
16
67
16

E
8
15
15
22

F
10
18
24
22

G
16
18
24
27

Duct Dimensions
K
L
7
63⁄4
111⁄2
83⁄8
131⁄2
103⁄4
16
183⁄4

Q
10
19
26
28

P
16
18
26
48

Weight
(lbs.)
340
860
1290
1470

A assumes outdoor unit with filters, weatherhoods,
Arrangementand
B supply damper.
All dimensions shown Arrangement
are in inches. Weight

Arrangement A

Arrangement B
Outdoor Air Discharge
LxK

Outdoor Air Discharge
LxK

Exhaust Air Inlet
FxG

Outdoor Air Inlet
QxP

D
C

Exhaust Air Inlet
FxG

Exhaust Air Discharge
LxK

Intake Hood

Exhaust Hood

Arrangement C

Arrangement D

Outdoor Air Discharge
LxK

Exhaust Air Inlet
FxG

Exhaust Air Inlet
FxG
Exhaust Hood

Intake Hood

Exhaust Hood

Intake Hood

Arrangement D

Arrangement C
Service Clearance
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.

Model
ERV-251
ERV-361
ERV-521
ERV-581

Supply Side
32
44
60
65

All dimensions shown are in inches.

Exhaust Side
30
30
40
40

Dimensions

ERV-522 and ERV-582
Model
ERV-522S
ERV-522H
ERV-582H

Exterior
A
B
124
84
124
84
146
97

Dimensions
C
D
E
64
16
19
64
16
19
77
171⁄2 263⁄4

F
48
48
60

G
25
25
28

Duct Dimensions
H
J
K
L
26
36
16
185⁄8
26
36
19
22
31
38
23
25

Q
60
60
70

Weight
(lbs.)

P
25
25
30

3230
3230
3700

All dimensions shown are in inches. Weight assumes outdoor unit with filters, weatherhoods, and supply damper.

ArrangementA A
Arrangement

Arrangement
BB
Arrangement
Outdoor Air Discharge
LxK

Outdoor Air Discharge
LxK

Exhaust Air Inlet
HxJ

Exhaust Air Inlet
FxG

Outdoor Air Inlet
QxP

Exhaust Air Discharge
LxK

Intake Hood

Exhaust Hood

Arrangement
Arrangement
DD

Arrangement
C C
Arrangement

Outdoor Air Discharge
LxK

Exhaust Air Inlet
HxJ

Exhaust Air Inlet
FxG

Intake Hood

Exhaust Hood

A
Exhaust Hood

Service Clearance
Model
ERV-522
ERV-582

The installation must allow clearance for access to
the energy recovery wheels and servicing. Minimum
clearances are shown in the table at right. Model ERV522 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.

Supply Side
38
42

All dimensions shown are in inches.

Exhaust Side
38
42

Performance

Supply and Exhaust - Belt and Direct Drive
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.

Greenheck Fan Corporation certifies that the
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:
1. Performance tables show EXTERNAL
static pressure capabilities.

All models are available in A, B, C, and
D arrangements.

Model ERV-251 / Direct Drive

2. B
hp, watt and amp values shown are for
one blower motor only.

ERV-251S (Standard Airflow)
Nominal
RPM

Max Amps
115/230

Max. Watts
(input)

0.25

0.375

950

3.0/1.5

300

563

536

1150

5.3/2.7

530

700

1350

8.6/4.3

855

834

0.25

0.375

802

777

CFM

EXTERNAL STATIC PRESSURE (in. wg)
0.50
0.625
0.75

1.00

1.25

498

450

378

680

658

634

597

513

818

801

783

762

711

642

1.00

1.25

ERV-251H (High Airflow)
Nominal
RPM

Max Amps
115/230

Max. Watts
(input)

1150

5.0/2.5

500

CFM

EXTERNAL STATIC PRESSURE (in. wg)
0.50
0.625
0.75
742

706

667

1340

8.1/4.1

810

958

937

915

887

857

792

1520

11.5/5.8

1150

1089

1070

1051

1032

1008

954

0.125

0.250

0.375

0.50

0.75

1.00

1.25

1.50

FRPM

777

863

941

1015

1147

1277

1397

1515

BHP

0.21

0.25

0.29

0.33

0.41

0.49

0.58

0.69

FRPM

899

974

1043

1109

1232

1343

1453

1557

895

ERV-361S (Standard Airflow)
CFM
1000

Model ERV-361 / Belt Drive

1200

EXTERNAL STATIC PRESSURE (in. wg)

OV
1495
1794

1400

2093

1600

2392

BHP

0.34

0.39

0.43

0.48

0.58

0.68

0.78

0.87

FRPM

1023

1091

1153

1212

1324

1429

1527

1618

BHP

0.52

0.58

0.64

0.68

0.80

0.92

1.03

1.14

FRPM

1149

1212

1269

1323

1424

1520

1613

1701

BHP

0.75

0.82

0.89

0.95

1.07

1.20

1.34

1.47

0.125

0.250

0.375

0.50

0.75

1.00

1.25

1.50

1006

1065

1122

1175

1275

1367

1457

1542

ERV-361H (High Airflow)
CFM
1600
1800
2000
2200

EXTERNAL STATIC PRESSURE (in. wg)

OV
2392
2691
2990
3289

FRPM
BHP

0.58

0.64

0.69

0.74

0.86

0.96

1.07

1.19

FRPM

1119

1172

1223

1272

1365

1452

1533

1613

BHP

0.82

0.88

0.93

0.99

1.12

1.25

1.36

1.49

FRPM

1232

1279

1326

1372

1458

1541

1618

1692

1.72

1.85

BHP

1.11

1.17

1.23

1.30

1.43

1.58

FRPM

1347

1389

1433

1474

1555

1633

BHP

1.46

1.53

1.60

1.67

1.81

1.97

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.

Performance

Supply and Exhaust - Belt Drive
ERV-521S (Standard Airflow)
CFM

Model ERV-521

2,200
2,700
3,200

EXTERNAL STATIC PRESSURE (in. wg)

OV
2,183
2,679
3,175

0.125

0.25

0.375

0.50

0.75

1.00

1.25

1.50

FRPM

830

881

933

981

1072

1155

1238

1315

BHP

0.72

0.80

0.87

0.95

1.09

1.25

1.41

1.57

FRPM

998

1040

1081

1124

1203

1278

1350

1416
2.30

BHP

1.29

1.38

1.47

1.57

1.75

1.93

2.12

FRPM

1168

1203

1240

1274

1345

1412

1477

BHP

2.11

2.21

2.32

2.43

2.65

2.86

3.08

0.125

0.25

0.375

0.50

0.75

1.00

1.25

1.50

980

1017

1054

1089

1159

1226

1290

1355

ERV-521H (High Airflow)
CFM
3,100
3,700
4,300

EXTERNAL STATIC PRESSURE (in. wg)

OV
3,076
3,671
4,267

FRPM
BHP

1.57

1.65

1.73

1.82

1.99

2.18

2.36

2.54

FRPM

1156

1187

1219

1249

1309

1367

1425

1480
3.77

BHP

2.62

2.72

2.83

2.92

3.12

3.33

3.55

FRPM

1334

1361

1388

1415

1467

1519

1569

BHP

4.08

4.20

4.31

4.43

4.65

4.89

5.13

0.125

0.25

0.375

0.50

0.75

1.00

1.25

1.50

FRPM

754

794

831

869

943

1011

1072

1134

ERV-522S (Standard Airflow)
CFM

Model ERV-522

5,000
5,750
6,500

EXTERNAL STATIC PRESSURE (in. wg)

OV
2,416
2,779
3,141

BHP

2.20

2.39

2.57

2.76

3.15

3.54

3.89

4.30

FRPM

855

892

924

957

1022

1087

1146

1201

BHP

3.28

3.49

3.70

3.92

4.33

4.81

5.26

5.67

FRPM

956

991

1021

1049

1108

1164

1222

1276

BHP

4.67

4.90

5.15

5.39

5.88

6.33

6.89

7.41

0.125

0.25

0.375

0.50

0.75

1.00

1.25

1.50

FRPM

535

581

619

660

731

797

857

913
3.72

ERV-522H (High Airflow)
CFM
6,000

EXTERNAL STATIC PRESSURE (in. wg)

OV
2,067

7,500

2,584

9,000

3,100

BHP

1.57

1.79

1.96

2.16

2.55

2.94

3.33

FRPM

646

686

722

753

818

877

930

983

BHP

2.90

3.20

3.46

3.68

4.17

4.66

5.12

5.62

FRPM

763

794

827

857

910

964

1016

1063

BHP

4.90

5.20

5.57

5.89

6.42

7.01

7.60

8.18

0.125

0.25

0.375

0.50

0.75

1.00

1.25

1.50

FRPM

637

687

733

772

850

923

988

1055

Model ERV-581

ERV-581H (High Airflow)
CFM
4,300
5,050
5,800

EXTERNAL STATIC PRESSURE (in. wg)

OV
2,064
2,424
2,784

BHP

1.20

1.35

1.49

1.61

1.88

2.16

2.42

2.73

FRPM

731

774

817

855

922

989

1053

1111

BHP

1.89

2.05

2.23

2.39

2.68

3.00

3.33

3.65

FRPM

826

866

903

939

1004

1061

1120

1177

BHP

2.79

2.99

3.18

3.38

3.74

4.07

4.44

4.83

0.125

0.25

0.375

0.50

0.75

1.00

1.25

1.50

FRPM

595

629

661

692

746

797

843

888

BHP

3.61

3.95

4.26

4.54

5.25

5.89

6.48

7.09

Model ERV-582

ERV-582H (High Airflow)
CFM

EXTERNAL STATIC PRESSURE (in. wg)

9,000

2,254

10,500

2,630

12,000

3,005

FRPM

685

713

741

769

820

867

911

952

BHP

5.60

5.99

6.38

6.74

7.44

8.27

9.03

9.74

FRPM

776

800

825

849

897

941

982

BHP

8.24

8.66

9.12

9.56

10.36

11.19

12.13

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

Model

Two Speed Open

115/1 230/1 230/460/3 230/1 230/460/3 230/1 230/460/3

ERV-251S*

ERV-251H*

⁄4

⁄2

⁄4

⁄2

ERV-361*

ERV-521*

ERV-581*

1-5

1-3

ERV-522*

11⁄2 - 3

11⁄2 - 15

11⁄2

1 - 15

1 - 71⁄2

ERV-582*

11⁄2 - 15

1 - 15

1 - 71⁄2

⁄4 - 2

⁄2 - 3

⁄2 - 5

⁄4 - 2

⁄2 - 11⁄2

⁄4 - 2

⁄2 - 1

⁄2 - 5

⁄2 - 1

⁄2 - 11⁄2

⁄2 - 3

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
Model

Wheel Drive Amps
115

208/230 460

24v
Control
Amps 115/1

Standard Electric Preheat kW
208/1

230/1

208/3

230/3

460/3

ERV-251

0.6

0.5

2.5

ERV-361

1.2

0.6

4.1, 8.2, 12.3

5, 10, 15

ERV-521

2.8

1.4

8.2, 12.3,
15.5

10, 15, 19

10, 15, 20, 25, 30

ERV-581

1.6

0.8

12.3, 15.5

15, 19

15, 20, 25, 30, 38

ERV-522

5.6

2.8

15.5

20, 25, 30, 45

ERV-582

3.2

1.6

15.5, 24.5

19, 30

20, 38, 50

2.1, 4.1 2.5, 5

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.

Model

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
exhaust motor amps = 2.6 A

ERV-251

Step 3: Calculate 15kW preheater amp draw =
15,000W/ [460 * 3 ] = 18.8 A
If no preheater is used skip step 3

ERV-361
ERV-521

Step 4: Wheel drive amps for ERV-361 from
table above = 0.6 A

ERV-581

Step 5: 24v Control Amps for ERV-361 from
table above = 1.0 A

ERV-522

Step 6: MCA = Amperage total from steps
1 thru 5 x 1.25

ERV-582

MCA = (3.4 + 2.6 + 18.8 + 0.6 + 1.0)
1.25 = 33 A

Filter Pressure Drop
Intake Hood
with 2-inch
CFM
aluminum
filters
500
0.09
1,000
0.32
1,000
0.09
2,200
0.45
2,500
0.13
4,500
0.45
4,500
0.17
5,500
0.30
6,000
0.15
9,000
0.40
9,000
0.13
12,000
0.45

Pleated
2-inch
filters
0.09
0.19
0.10
0.28
0.14
0.32
0.15
0.24
0.14
0.25
0.16
0.27

Note: Calculations are approximate, use our Computer Aided Product Selection (CAPS) program for exact
MCA calculations.

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

Bars and Clubs

Churches

Dormitories

Locker Rooms

Nursing Homes

Office Buildings

Printing Shops

Restaurants

Schools

Function Halls

Casinos

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

Cooling
Coil

72°F

50%

ZONE 1

72°F

Energy
Wheel

OUTDOOR
AIR

50%

Exhaust
Fan

ZONE 2

EXHAUST AIR

RESTROOM

RELIEF AIR

With Packaged Rooftop Equipment
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.

RESTROOM
ZONE 1

Exhaust
Fan

EXHAUST
AIR

72°F

50%

AIR HANDLING
UNIT (AHU)
Energy
Wheel

Supply
Fan

ENERGY RECOVERY
VENTILATOR (ERV)

SUPPLY AIR
Heating
Coil

Cooling
Coil

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 wraparound 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.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specifications without notice.

P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck.com

Prepared to Support
Green Building Efforts

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History When                    : 2010:06:03 11:39:02-05:00, 2010:06:03 11:39:02-05:00, 2010:06:03 11:43:34-05:00, 2010:06:03 11:52:23-05:00, 2010:06:03 12:05:36-05:00, 2010:06:03 13:18:43-05:00, 2010:06:03 13:19:19-05:00, 2010:06:03 13:22:28-05:00, 2010:06:03 13:29:04-05:00, 2010:06:03 13:33:08-05:00, 2010:06:03 13:33:43-05:00, 2010:06:03 13:33:56-05:00, 2010:06:03 14:25:51-05:00, 2010:06:03 14:48:35-05:00, 2010:06:03 14:49:51-05:00, 2010:06:03 14:51:17-05:00, 2010:06:03 14:54:22-05:00, 2010:06:03 15:05:07-05:00, 2010:06:03 15:10:42-05:00, 2010:06:03 15:15:17-05:00, 2010:06:03 15:19:24-05:00, 2010:06:03 15:20:35-05:00, 2010:06:03 15:24:18-05:00, 2010:06:03 15:24:41-05:00, 2010:06:03 15:25:57-05:00, 2010:06:03 15:27:53-05:00, 2010:06:03 15:29:47-05:00, 2010:06:03 15:30:14-05:00, 2010:06:03 15:31:11-05:00, 2010:06:03 15:34:50-05:00, 2010:06:03 15:35:21-05:00, 2010:06:03 15:36:44-05:00, 2010:06:03 15:40:06-05:00, 2010:06:03 16:02:39-05:00, 2010:06:03 16:10:08-05:00, 2010:06:04 08:43:22-05:00, 2010:06:04 08:43:37-05:00, 2010:06:04 09:40:39-05:00, 2010:06:04 09:58:51-05:00, 2010:06:04 10:00:52-05:00, 2010:06:04 10:44:32-05:00, 2010:06:11 15:02:45-05:00, 2010:06:11 15:49:10-05:00, 2010:06:21 13:20:33-05:00, 2010:06:21 13:21:50-05:00, 2010:06:21 13:21:50-05:00
History Software Agent          : Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0, Adobe InDesign 6.0
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Create Date                     : 2010:06:21 13:34:01-05:00
Modify Date                     : 2010:06:30 13:56:48-05:00
Metadata Date                   : 2010:06:30 13:56:48-05:00
Creator Tool                    : Adobe InDesign CS4 (6.0.5)
Thumbnail Format                : JPEG
Thumbnail Width                 : 256
Thumbnail Height                : 256
Thumbnail Image                 : (Binary data 14004 bytes, use -b option to extract)
Doc Change Count                : 822
Format                          : application/pdf
Producer                        : Adobe PDF Library 9.0
Trapped                         : False
Page Count                      : 16
Creator                         : Adobe InDesign CS4 (6.0.5)

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Greenheck Fan Energy Recovery Ventilator Erv Users Manual

Energy Recovery Ventilator ERV ERV_catalog

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