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
• ChilledWater
• DirectExpansion
Re-heat Options
• Electric
• HotWater
• IndirectGas
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
• HotWater
• IndirectGas
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
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