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BASIC OPERATION
The ERH brings in fresh,
outdoor air and
removes stale, exhaust
air. Prior to discharging
the exhaust air, the
energy recovery wheel
transfers energy from
the exhaust air to the
outdoor air at an
efficiency of 70-80%.
Simply put, this unit
preconditions the
outdoor air to save
money on heating and
cooling costs. This
particular unit also has
a heater option
available after the
recovery wheel to
further increase the
fresh air temperature if
desired.
INSTALLATION
The system design and installation should follow accepted industry
practice, such as described in the ASHRAE Handbook.
Adequate space should be left around the unit for piping coils and
drains, filter replacement, and maintenance. Sufficient space should
be provided on the side of the unit for routine service and
component removal should that become necessary.
See page 6 for more detail on appropriate clearances.
LIFTING
Units must be lifted as it ships from the factory. All units are
equipped with lifting lugs. THE USE OF ALL LIFTING LUGS IS
MANDATORY WHEN LIFTING. Lifting should only be done with all
access doors closed to avoid damaging the unit. To prevent damage
to the unit cabinetry, use spreader bars. Spreader bars must be in
position to stop cables from rubbing the frame or panels. Before
hoisting into position, test lift to insure stability and balance. Avoid
twisting or uneven lifting of the unit. Never lift units by weatherhoods.
RECOMMENDED ROOF OPENING
TABLE 1
Model
U
ERH-20
46
ERH-45
54
ERH-55
65
ERH-90
85
Dimensions shown are in inches.
Exhaust Air
discharged outside
Outdoor Air
V
37
39
47
49
FIGURE 2
Energy
Recovery
Wheel
Preconditioned Air sent
to conditioning system
UNIT WEIGHTS (dry weights)
V
EXHAUST
INLET
U
SUPPLY
OUTLET
Exhaust Air
from building
Optional
Heater
Lift using lifting
lugs and
spreader bar
FIGURE 1
TABLE 2
Unit Size Approx. Weight (lbs)
ERH-20
1000
ERH-45
1800
ERH-55
2500
ERH-90
4500
3
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