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Typical Control Center Components
1. Main Disconnect (non-fusible, lockable)
2. Motor Starter – Exhaust Air Fan
3. Motor Starter – Outdoor Air Fan
4. Motor Contactor – Energy Wheel
5. 24 VAC Control Transformer
6. 24 VAC Terminal strip
7. Fuses for blower motors
5
1
7
2
3
4
ERV-251, 361, 521, 581
Exhaust
Hood
Access to Control Center Components
is gained through the access panel indicated.
ERV-522
Exhaust Hood
Intake
Hood
6
Exploded Detail
of Terminal Strip
Intake
Hood
ERV-582
Exhaust Hood
Intake
Hood
Electric Heater Application/Operation
Factory installed electric heaters can be provided for
preheat frost control. An electric preheater warms
the outdoor air prior to the energy recovery wheel
to prevent frosting on the wheel. Electric heaters
are available in 208, 230, or 460 VAC (refer to heater
nameplate for voltage).
Preheaters: Preheaters are standard as single-stage
on/off control. Preheaters are single point wired at
the factory. A thermodisc temperature sensor (with
a 5°F set point) is mounted in the outdoor airstream
after the preheater to turn the preheater on. See Frost
Control Application/Operation for typical set points. If
the temperature falls below
the set point and the wheel
pressure drop sensor is
triggered, the preheater will
turn on.
Access to the preheater
control panel is through the
outdoor air filter door.
Unit Accessories
Outdoor Air Weatherhood
Outdoor air weatherhood will be
factory mounted.
Exhaust Weatherhood
The exhaust weatherhood is shipped
separately as a kit with its own
instructions.
Dampers
Backdraft dampers are always
included as an integral part of the
exhaust hood assemblies. Motorized
outdoor air and exhaust air dampers
are optional and are factory mounted
(and wired) at the intake.
Energy Recovery Ventilator
9
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Troubleshooting
