Greenheck ERH-20 User Manual
Energy Recovery Ventilator with Heating
Model ERH
• Commercial • Institutional
• 10,000 cfm
• 1.5 in. wg external static pressure
April
2005
Product Features
Model ERH
Energy Recovery Ventilator 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. For applications requiring cooling,
refer to Model ERCH.
Model ERH shown with optional
indirect gas heater, supply
filters, and exhaust filters.
2
Total Energy Wheel recovers
energy from the exhaust air
stream and transfers it to the
supply air stream. The wheel is
constructed of a light-weight
polymer and a permanently
bonded silica gel desiccant.
Eight wheel segments are
easily removable for cleaning.
Optional Tempering Section provides supplemental
heating of the outdoor air after pre-conditioning by
the energy wheel. Tempering options include indirect
gas, hot water, and electric.
Standard Construction
With every ERH, you automatically receive:
✓ Forward Curved Blowers & Motor Assemblies
mounted on isolation bases with neoprene
vibration isolators for smooth, quiet operation.
✓ A Control Box furnished with motor starters for
the supply blower, exhaust blower, and energy
wheel motors.
✓ Double Wall Housing which provides a
galvanized steel-lined interior to prevent exposure
of the insulation to the airstream.
✓ Access Doors to blowers, filters, energy wheel,
and heater section to simplify inspection and
routine service.
✓ Single Point Wiring with a disconnect switch and
low voltage terminal strip.
❏
❏
❏
❏
❏
Hot Water
Indirect Gas
Electric
You Get a Product that is Simple to Operate:
• Fresh outdoor air is pre-conditioned by the total
enthalpy wheel, recovering a majority of the energy
from the exhaust air.
- Saves 3-4 tons of cooling per 1000 cfm
- Saves 50-60 MBH of heating per 1000 cfm
• The heating section further tempers cold outdoor
air to desired conditions.
You Get a Product that is Flexible:
• Four housing sizes
• Airflow capacities up to 10,000 cfm
• External static pressures up to 1.5 in. wg
Greenheck certifies that the ERH 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.ari.org/directories/erv
1. Outdoor air enters ERH unit.
2. The energy recovery wheel
cools and dehumidifies
outdoor air using energy
from the exhaust air stream.
Load is reduced by 3 to 4
tons per 1,000 cfm for
many climates.
20 30 40 50 60 70 80 90 100
30
40
50
60
70
80
180
160
140
120
100
80
60
40
20
Specific Humidity
Dry Bulb Temp.
Wet Bulb Temp.
9
0%
70%
50%
30%
10%
Supply Air
Room Air
Outdoor Air
The ERH preconditions
outdoor air for summer
operation. For winter
operation, a variety of
heating options are available
to expand the tempering
capabilities of the energy
recovery wheel.
See below for a description
of the summer and winter
processes along with a
psychrometric illustration.
The numbers on the drawing
at the right correspond to
the numbers on the
psychrometric charts.
Whether a design day or
part load day, the ERH
lowers the temperature
and moisture levels of
summer outdoor air
prior to entering the
ventilation system. This
means you can
downsize the cooling
equipment
and provide
better humidity control
to the space.
2
1
The ERH preconditions
winter outdoor air
typically to 45-65°F. If
your design requires
additional heating, three
heating options are
available:
• Electric
• Hot Water
• Indirect Gas
1. Outdoor air enters ERH unit.
2. The energy recovery wheel heats and
humidifies winter outdoor air using energy
from the exhaust air stream. Heating bills
are significantly reduced and overly dry
indoor conditions are eliminated.
3. The heating coil or furnace
provides supplemental heating
to further treat the outdoor
air to desired supply
conditions.
30
40
50
60
70
80
180
160
140
120
100
80
60
40
20
Specific Humidity
Dry Bulb Temp.
Wet Bulb T
emp.
90%
70%
50%
30%
10%
Supply Air
Room Air
Outdoor Air
Wheel
Heating
Coil
10 20 30 40 50 60 70 80 90 100
110
2
3
1
Tempering Capabilities
3
Winter
2
1
3
Typical Winter
operation.
Fresh Outdoor Air
Exhaust Air
from Space
Summer
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