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Model ERV Energy Recovery Unit
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
Interior
Outdoor Air
Inlet
Exhaust Air
Discharge
Rooftop
Exhaust
Hood
Intake
Hood
Exhaust Air
Inlet
Outdoor Air
Discharge
ERV-251, 361, 521, 581
Access to Control Center Components
is gained through the access panel indicated.
6
ERV-522
Interior
Rooftop
Exhaust Air
Inlet
Outdoor Air Inlet
Exhaust Air Discharge
Exhaust Hood
Intake
Hood
Outdoor Air
Discharge
ERV-582
Interior
Rooftop
Exhaust Air
Inlet
Outdoor Air Inlet
Exhaust Air Discharge
Exhaust Hood
Intake
Hood
Outdoor Air
Discharge
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 2-stage,
step control. Step control heaters are designed with
multiple stages made up of equal increments of
heating capability. For example, a 10 kW heater with
two stages will be composed of two 5-kW stages.
Preheaters are single point wired at the factory.
A temperature sensor (with field adjustable 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 first stage of
the preheater will turn on. If the first stage does not
satisfy the set point, the second stage will also turn
on.
Electric Preheater:
The preheater is
single point wired
to the unit control
center. 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