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Unit accessories, Typical control center components, Electric heater application/operation – Greenheck Fan 455924 ERV-522 User Manual

Page 9: Outdoor air weatherhood, Exhaust weatherhood, Dampers

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9

Energy Recovery Ventilator

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

1

2

3

4

7

5

Exploded Detail

of Terminal Strip

Exhaust

Hood

Intake

Hood

ERV-251, 361, 521, 581

Access to Control Center Components

is gained through the access panel indicated.

6

ERV-522

Exhaust Hood

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.

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.

Unit Accessories

This manual is related to the following products: