10
Model PV
e
Heat Recovery Unit
Typical Control Center Components
1. Main Disconnect (non-fusible, lockable)
2. Motor Starter
3. Motor Starter
4. Power Distribution Blocks
5. 24 VAC Control Transformer
6. 24 VAC Terminal Strip
7. Temperature Sensor with Override (used for
Economizer Mode)
8. Dirty Filter Sensor
9. Dirty Filter Sensor
Electric Heater Application/Operation
Factory installed electric heaters are optionally
provided in order to provide preheat frost control.
An electric preheater warms the outdoor air prior to
being drawn through the PVe plate heat exchanger.
Electric heaters are available in 208, 230, or 460 VAC.
Refer to heater nameplate for voltage rating.
Preheaters:
If an optional preheater is supplied with
the unit, it is installed as a single stage on/off control.
Preheaters are single-point wired at the factory. A
thermocouple type
temperature sensor
is mounted in the
outdoor airstream
after the preheater and
that thermocouple will
switch the preheater
on. See Frost Control
Application/Operation
for typical set points.
If the temperature falls
below the set point
and a pressure drop
sensor is triggered, the
preheater will turn on.
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