Greenheck ERCH-45H User Manual

Energy Recovery with Cooling & Heating

Model ERCH

• Commercial • Institutional

• 10,000 cfm

• 1.5 in. wg external static pressure

February

2005

Product Features

Model ERCH

Energy Recovery Ventilator With Cooling & Heating

The model ERCH combines the benefits of the
total energy wheel with supplemental heating and
cooling. The result is a product that is specifically
designed to process 100% outdoor air to desired
supply conditions. Four housing sizes provide air flow
capacities from 1,000 cfm to 10,000 cfm with external
static pressures up to 1.5 in. wg (for requirements
above this performance, refer to Model ERT or APEX).

Product operation is simple:

• Fresh outdoor air is pre-conditioned by the total
enthalpy wheel, recovering a majority of the energy
from the exhaust air.

• The coil section further conditions the outdoor air to
desired conditions (typically near room conditions).

Standard Construction

Single Point
Wiring is standard.

A disconnect
switch and low
voltage terminal
strip are provided.

Hinged Access
Doors provide

easy access to
blowers, energy
wheel, filters, and
coil section for
inspection and
routine service.

Forward Curved
Blowers are

mounted on neoprene
vibration isolators.

Double Wall Housing is

constructed of heavy gauge
steel with 1-inch insulation.
The supply and exhaust
side are internally lined with
galvanized steel.

A Control Box is furnished

with motor starters for the
supply blower, exhaust
blower and wheel motors.
Also included is a 24 volt
control circuit.

Model ERCH shown with
optional chilled water coil
and indirect gas heater.

The Coil Section

provides supplemental
cooling or heating of
the outdoor air after
pre-conditioning by the
energy wheel. Tempering
options include chilled
water, direct expansion,
hot water, electric heat,
and indirect gas.

Greenheck Fan Corporation certifies
that the ERCH 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.

Energy recovery wheels certified by the ARI Air­to-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.airdirectory.org/ari/erv.php

Benefits

Healthy Buildings: Ventilate buildings adequately

without losing control of indoor humidity levels. The
ERCH is capable of conditioning summer air to room
design conditions. Also, it helps prevent overly dry
winter air that can contribute to respiratory irritation.

System Design Simplicity: The ERCH is designed

specifically to provide outdoor air to the space at
desired conditions. This effectively de-couples the
outdoor air load from the building load, enabling the
traditional VAV system to perform as it was intended
in response to building loads.

2

Load Reduction: The energy wheel saves 3 to 4 tons

of cooling AND 50-60 MBH of heating for every 1,000
cfm of outdoor air for many climates.

Low Maintenance:

Servicing is minimal. All components have a well
established history of reliable operation.

ASHRAE 62 Compliance: By assuring that minimum

outdoor air volumes are delivered to the room spaces,
compliance with the ASHRAE 62 Standard is clearly
demonstrated.

50

60

70

80

180

160

140

120

100

80

60

40

20

90%

70%

50%

30%

10%

Reheat

Room Air

Outdoor Air

Wheel

Cooling

Coil

Supply Air

W

e

t

B

u

l

b

T

e

m

p

.

Dry Bulb Te mp.

Specific Humidity

30

40

50

60

70

80

180

160

140

120

100

80

60

40

20

90%

70%

50%

30%

10%

Supply Air

Room Air

Outdoor Air

Wheel

Heating

Coil

10

W

e

t

B

u

l

b

T

e

m

p

.

Dry Bulb Te mp.

Specific Humidity

20 30 40 50 60 70 80 90 100 110

Cooling and Heating
Capabilities

To expand the cooling and heating capabilities
of the energy recovery wheel, a variety of
tempering options are available. The coil
section of the ERCH accommodates a cooling
coil, a heating coil, or both.

A description of the cooling and heating
processes along with a psychrometric
illustration is shown below. Cooling and heating
coil options are also listed.

Consult your Greenheck representative for coil
selections or for tempering options not listed.

COOLING

Supplemental cooling is
recommended when the
air conditions leaving
the energy recovery
wheel have not been
cooled or dehumidified
to the desired leaving
conditions.

Cooling Options

• ChilledWater

• DirectExpansion

Re-heat Options

• Electric

• HotWater

• IndirectGas

1. Outdoor air enters ERCH unit.

2. The energy recovery wheel cools and
dehumidifies outdoor air using energy
from the exhaust airstream. Load is
reduced by 3 to 4 tons per 1,000 cfm
for many climates.

3. The cooling coil provides
supplemental cooling to
further treat the outdoor
air to desired supply
conditions.

4. Optional reheat
available to provide
space neutral air.

1

2

3

4

1

2

3

4

HEATING

Supplemental heating is
recommended when the
air conditions leaving the
energy recovery wheel
have not been heated
to the desired leaving
conditions.

Heating Options

• Electric

• HotWater

• IndirectGas

1. Outdoor air enters ERCH unit.

2. The energy recovery wheel heats and humidifies

winter outdoor air using energy from the
exhaust airstream. Heating bills are
significantly reduced and overly dry
indoor conditions are eliminated.

3. The heating coil or furnace

1

provides supplemental heating
to further treat the outdoor
air to desired supply
conditions.

2

3

3

Air Performance

ERCH-20M

CFM OV

1000 1142

1300 1485

1600 1828

ERCH-20H

CFM OV

1600 1828

1900 2171

2200 2514

ERCH-45L

CFM OV

2200 2109

2700 2588

3200 3068

ERCH-45H

CFM OV

3200 2184

3800 2593

4400 3003

ERCH-55H

CFM OV

4200 1989

5100 2415

6000 2842

ERCH-90H

CFM OV

6000 2066

8000 2755

10000 3444

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.

4

RPM 1141 1344 1498

BHP 0.36 0.51 0.53

RPM 1265 1426 1578 1857

BHP 0.55 0.72 0.90 1.05

RPM 1418 1553 1684 1934 2189

BHP 0.87 1.03 1.21 1.67 2.17

RPM 1308 1446 1575 1816

BHP 0.74 0.89 1.04 1.37

RPM 1453 1574 1691 1907 2108 2306

BHP 1.10 1.27 1.45 1.80 2.19 2.65

RPM 1608 1717 1820 2020 2205 2375

BHP 1.57 1.77 1.96 2.39 2.79 3.20

RPM 797 892 986 1166 1329

BHP 0.68 0.81 0.96 1.29 1.65

RPM 900 977 1053 1209 1359 1494 1628

BHP 1.10 1.25 1.40 1.77 2.18 2.58 3.03

RPM 1010 1079 1143 1274 1406 1533 1655 1768

BHP 1.67 1.87 2.04 2.41 2.86 3.33 3.82 4.29

RPM 900 989 1071 1220 1360 1495

BHP 1.17 1.34 1.53 1.92 2.35 2.83

RPM 1004 1083 1157 1297 1422 1542 1654 1769

BHP 1.79 1.99 2.20 2.64 3.11 3.61 4.12 4.70

RPM 1114 1185 1252 1380 1499 1609 1713 1815

BHP 2.60 2.85 3.08 3.57 4.09 4.64 5.18 5.78

RPM 749 832 906 1038 1155

BHP 1.54 1.82 2.10 2.65 3.21

RPM 839 913 982 1107 1216 1318 1412 1520

BHP 2.43 2.77 3.11 3.80 4.45 5.15 5.81 6.73

RPM 940 1003 1065 1181 1287 1382 1472 1558

BHP 3.67 4.05 4.45 5.26 6.06 6.84 7.64 8.44

RPM 612 682 746 862 962 1058

BHP 1.99 2.37 2.75 3.52 4.33 5.21

RPM 723 783 841 941 1036 1122 1202 1275

BHP 3.91 4.41 495 5.94 6.97 7.98 9.08 10.14

RPM 845 897 946 1040 1124 1201 1277 1348

BHP 7.00 7.56 8.18 9.50 10.78 12.00 13.29 14.52

External Static Pressure in inches of wg.

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

External Static Pressure in inches of wg.

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

External Static Pressure in inches of wg.

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

External Static Pressure in inches of wg.

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

External Static Pressure in inches of wg.

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

External Static Pressure in inches of wg.

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

Greenheck Fan Corporation certifies that the
ERCH 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.

Air Performance

The air performance data on page 4 accounts for the pressure drop across the energy recovery wheel and the
internal housing losses, but does not include pressure drop for filters or tempering options. Add filter and/or
tempering option pressure drop (from tables below) to external static pressure to determine correct rpm and
horsepower.

Filter Pressure Drop (30% eff.)

Model CFM

ERCH-20

ERCH-45

ERCH-55

ERCH-90

1000 0.04

2200 0.22

2200 0.06

4400 0.24

4200 0.09

6000 0.18

6000 0.10

10000 0.27

Pressure Drop

(in. wg)

Intake & Discharge
Options

WiththeERCH,youhavemanyairintake

and discharge options available to simplify
duct layout for rooftop and equipment room
installations. Refer to the table below for the
intake and discharge locations available for
outdoor air (OA) and exhaust air (EA).

Tempering Options Pressure Drop

Model CFM

ERCH-20

ERCH-45

ERCH-55

ERCH-90

NOTE: Coil data assumes 6 row cooling coils and 1 row heating coils.

1000 0.17 0.02 0.03

2200 0.62 0.08 0.13

2200 0.31 0.04 0.09

4400 0.66 0.08 0.34

4200 0.38 0.04 0.10

6000 0.64 0.08 0.26

6000 0.28 0.03 0.24

10000 0.66 0.08 0.55

Outdoor Air

Intake

End

Cooling Coil

(in. wg)

Top

Heating Coil

(in. wg)

Top

Bottom

Indirect Gas

(in. wg)

Outdoor Air

Discharge

End

Side

Bottom Top Side End

OA Intake X X

OK Discharge X X X

EA Intake X X X

EA Discharge X X X

1

Side OA Discharge is ONLY available with

1

the Indirect Gas (IG) heater.

2

End OA Discharge is NOT available with
the Indirect Gas (IG) heater.

2

X

Top

Exhaust

Discharge

Side

Top

Exhaust

Intake

End

End

Bottom

5

Accessories

Weather Hoods

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

Dampers — Internally Mounted

A variety of motorized control
dampers are available. Intake
and exhaust dampers are
internally mounted at the
outdoor and exhaust air inlets.
Dampers are factory wired to a
single point power disconnect.

Filters

Standard size 2-inch, MERV 8, pleated, medium
efficiency filters and filter racks are available for
outdoor air and/or exhaust air streams.

Frost Control

In cold climates, the recovery wheel may develop
frost, which will decrease airflow. Three factory
mounted options are available to address frosting:

• Timed Exhaust Frost Control

The timed exhaust frost control turns the supply

blower off and on intermittently. Control is
triggered by an outdoor air temperature set point in
conjunction with an increased pressure drop across
the energy wheel.

• Modulating Wheel Frost Control

The modulating wheel frost control enables

continuous unit operation. A variable frequency
drive (VFD) reduces wheel speed when the outdoor
air temperature falls below the frost threshold
set point and upon an increase in the differential
pressure across the energy wheel. The temperature
and pressure differential set points are set at the
factory, but are field-adjustable. The VFD will be
fully programmed and wired at the factory.

• Preheat Frost Control

The preheat frost control enables continuous unit

operation. An electric heater warms the outdoor air
above the frost threshold before it enters the energy
recovery wheel. Control is triggered by the outdoor
air temperature set point in conjunction with
increased pressure drop across the energy wheel.

Rotation Sensor

Senses when a wheel rotation failure occurs and
sends a signal to an indicator light. The light is
available on a remote control panel from the factory.

Microprocessor Discharge
Temperature
Control

The microprocessor
controller is specifically designed and programmed
to optimize the performance of an ERCH unit with
supplemental heating and cooling. This option
ensures that the outdoor air is conditioned to
the desired discharge conditions. The controller
and accompanying sensors are factory mounted,
wired and programmed. Default settings are pre­programmed, but are easily field adjustable. The
microprocessor controller can be interfaced with
a Building Management System (BMS) through

LonWorks,BACNET,orModBus.

Economizer Control (Free Cooling)

Whencooloutdoorairisavailable,theenergywheel

may be controlled to provide free cooling. Economizer
operation can be initiated by the unit sensors alone or
in conjunction with a call for cooling (field wired). Two
factory installed options are available.

• Wheel Off: De-energizes the wheel when the

outdoor temperature is below the field adjustable
set point (enthalpy sensor also available). An
automatic economizer override is included to
engage the wheel for winter heating operation.

• Wheel Modulation: Modulates the energy recovery

wheel to maintain a 55°F discharge temperature
during economizer operation.

Note: Control centers in Greenheck energy recovery
ventilators enable the control of the energy wheel and
fans via 24-volt control signals (by others). Controls
by others may be preferred when air handling units
are equipped with an economizer section.

Variable Air Volume

Model ERCH utilizes variable
frequency drives (VFD’s) for
multi-speed or modulating
blower control to vary airflows.
This includes a separate VFD for
each blower.

Additional Accessories:

• Remote Panels

• GFCI Service Outlet (control power by others)

• Service Lights (control power by others)

• SpareWheelSegments

• Roof Curbs

• Painted Exteriors

• Factory Mounted Sensors

6

Typical
Specifications

General: Energy Recovery Ventilator shall be as manufactured

by Greenheck or approved equal provided all specifications
are met. Greenheck Model ERCH is used as the basis of
design. Units shall be listed per ANSI/UL 1995, Heating and
Cooling Equipment. Energy transfer ratings of the energy
recovery wheel shall be ARI Certified. Ventilators shall bear the
AMCA Certified Rating seal for Air Performance. Performance
shall be as scheduled on plans. Exhaust discharge and
outside air intake shall not be located on the same side on
roof top units.

Unit Casing and Frames: Unit shall be of internal frame

type construction of galvanized steel. Frame and panels shall
be G90 galvanized steel. All panels exposed to the weather
shall be a minimum of 18 gauge galvanized steel. Unit shall
be internally lined with galvanized sheet metal creating a

double wall. Where top panels are joined there shall be

an overlapping, standing seam to insure positive weather
protection. All metal-to-metal seams shall be factory sealed,
requiring no caulking at job site. Permatector™ exterior
finish is available for outdoor units. Unit base to be designed
for curb mounting. Unit base shall overhang the curb for a
positive seal against water run-off.

Weatherhoods: Weatherhoods shall be the same finish

as the unit. Outdoor air weatherhood shall incorporate a

louvered design and moisture eliminator. Weatherhoods

shall be tested in accordance with AMCA Standard 500-L to
prevent water penetration up to 3 in/hr at 29 mph.

Insulation: Unit casing to be insulated with 1-inch fiberglass.

Insulation shall meet requirements of NFPA 90A and tested to
meet UL 181 erosion requirements. Insulation to be enclosed
in double wall construction.

Energy Recovery Wheel: Wheelshallbeoftheenthalpytype

for both sensible and latent energy recovery and be designed
to insure laminar flow. Energy transfer ratings must be ARI
Certified to Standard 1060 and bear the ARI Certification
symbol for ARI Air-to-Air Energy Recovery Ventilation
Equipment Certification Program based on ARI 1060. Ratings
“in accordance with 1060” without certification are not
acceptable. Desiccant shall be silica gel for maximum latent

energy transfer. Wheel shall be constructed of lightweight

polymer media to minimize shaft and bearing loads. Polymer
media shall be mounted in a stainless steel rotor for corrosion
resistance.

Wheeldesignshall consist of removable segments for ease

of service and/or cleaning. Silica gel desiccant shall be
permanently bonded to wheel media to retain latent heat

capabilityaftercleaning.Wheelswithsprayedondesiccant
coatingsare not acceptable.Wheelswithdesiccantapplied

after wheel formation are not acceptable. Energy recovery
device shall transfer moisture entirely in the vapor phase.

Energy recovery drive belt material shall be high strength
urethane and shall be factory installed in a pre-stretched
state, eliminating the need for field belt tension adjustment.
Link style belts are not acceptable.

Hinged Access Doors: All components shall be easily

accessible through hinged access doors for exhaust, supply,
filter, and damper compartments. Energy recovery wheels
(smaller than 58 inches) shall be mounted in a slide-out track
for ease of inspection, removal, and cleaning.

Roof Curbs: Roof curb to be supplied by unit manufacturer

for field assembly. Curb shall consist of die formed galvanized
steel sections. Curb shall be full perimeter type with gasketing
provided for field installation between curb and unit base.

Fan Sections: Centrifugal fans to be double width, double

inlet, forward curved type. All blower wheels shall be statically
and dynamically balanced. Ground and polished steel fan
shafts shall be mounted in permanently lubricated, sealed
ball bearing pillow blocks. Bearings shall be selected for a
minimum (L10) life in excess of 100,000 hours at maximum
cataloged operating speeds. Separate motors for exhaust
and supply blowers shall be provided. Adjustable sheaves
on belt-driven fans with motors less than 10 hp shall allow
independent balancing of exhaust and supply airflow. Fan and
motor assemblies are mounted to unit base with neoprene
isolators as standard. Fans shall be located in draw-through
position in reference to the energy recovery wheel.

Motors and Drives: Motors shall be energy efficient,

complying with EPACT standards, for single speed ODP
and TE enclosures. Motors shall be permanently lubricated,
heavy-duty type, matched to the fan load and furnished at
the specified voltage, phase, and enclosure. Drives shall be
sized for a minimum of 150% of driven horsepower. Pulleys
shall be of the fully machined cast type, keyed and securely
attached to the fan wheel and motor shafts; 10 hp and less
shall be supplied with an adjustable drive pulley. Energy
wheel motors shall have integral overload protection.

Filters: Supply and exhaust air filters shall be 2-inch thick

pleated fiberglass, 30% efficient and tested to meet UL
Class 2. Filter racks shall be die-formed galvanized steel.

Electrical: All internal electrical components shall be factory

wired for single point power connection. Units with electric
reheat will be wired with independent power supply. All
electrical components shall be UL Listed, Approved, or
Classified where applicable and wired in compliance with the
National Electrical Code.

Weatherproof, integral doorinterlocking disconnect switch,

motor starters, control circuit fusing, control transformer
for 24 VAC circuit, and terminal strip shall be supplied as
standard components in the control center. Motor starters
consist of a contactor and Class 20 electronic adjustable
overload protection and shall be provided for all fan motors.

Cooling Coil: Direct expansion (DX) and chilled water coils

shall be factory tested and rated in accordance with ARI 410.
Coils shall have copper tubes with permanently expanded
aluminum fins, 12 fpi or less. DX coils shall be equipped
with distributors to receive expansion valves at the liquid
connections. DX coils shall include stainless steel drain pan.

Indirect Gas: Indirect fired gas furnace shall be 80%

efficient, UL Certified and Listed per ANSI Z83.8 - 2002,
C.G.A. approved per 2.6 - 2002 and have a blow through fan
design. Furnace shall be capable of operation with natural
or LP gas and have a power venting system. The burner and
heat exchanger shall be constructed of aluminized steel.
Standard furnace features shall include main gas pressure
regulator, main gas valve, electronic staged or electronic
modulating controls, direct spark ignition system, high limit
and a 24 volt control transformer.

Hot Water Coil: Hot water coil shall be factory tested and rated

in accordance with ARI 410. Coils shall have copper tubes with
permanently expanded aluminum fins, 12 fpi or less.

Electric Heat: Electric heat shall be UL listed and circuit

fused per NEC over 48 amps. Heater shall be multi-step
control, factory wired and installed. Control will be 24 volt
with class 2 transformer. Standard air flow switch to shut
down heater if air ceases to flow across heater.

7

Dimensional Data

Outdoor Air

Hood

Outdoor Air

Hood

Exhaust

Hood

2 in. filters

2 in. filters

2 in. filters

Wheel Cassette

Wheel Cassette

Coil

Section

Coil

Section

Optional

IG Heater

Optional

IG Heater

Electrical Box

DA

B

C

E

F

Model A B C D E F

ERCH-20 98 50 56 18 18 9

ERCH-45 106 69 66 16 20 11

ERCH-55 118 70 76 16 25 11

ERCH-90 131 85 96 16 27 11

All dimensions shown are in inches.

Model Approximate Weight (lbs)

ERCH-20 1500

ERCH-45 2300

ERCH-55 3000

ERCH-90 5000

Actual weight is dependent upon unit configuration.

Side
View

Top

View

OurWarranty

Greenheck warrants this equipment to be free from defects in material and workmanship for a period

of one year from the purchase 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.

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

Copyright©2005GreenheckFanCorp.•CatalogERCHSNRev.4February 2005

Prepared to Support

Green Building Efforts