Greenheck Fan PVE-20 Typical Control Center Components, Electric Heater Application/Operation

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

15

6

4

7

2 3 8 9

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.

10Model PVe Heat Recovery Unit