Data Sheet for Product

Sequence of Operation

Occupied Control

Fan

The fan can be configured to operate continuously in occupied mode, or only when necessary

to operate the compressors, auxiliary heat, or outside air damper. An optional fan status input

can be used to ensure fan operation before allowing other equipment to operate.

Outside Air Damper

If the economizer is enabled, the optional outside air damper will modulate to maintain the

mixed or discharge temperature at setpoint while maintaining a configurable minimum

position. As the cooling demand changes, the control setpoint resets within a configurable

range. If economizer is not enabled, the damper will go to minimum position.

In heating mode, the outside air damper maintains its minimum position.

Compressor Stages

The Predator can operate heat pumps that have separate inputs for heating and cooling compressors

or those that have inputs for compressors and a reversing relay. Configurable minimum-on, minimum-

off, and inter-stage periods are observed.

In cooling mode, if economizer is disabled or insufficient to meet room load, the cooling compressors

will stage operate to meet room load.

In heating mode, the heating stages will be operated to meet room load.

Auxiliary/Perimeter

Optional auxiliary and perimeter heat can be configured to supply heating in addition to the

compressor. In heating mode, auxiliary and perimeter heat operate according to room load.

Unoccupied Control

Fan

In unoccupied mode, the fan cycles on only as necessary to operate the compressors,

auxiliary heat or the outside air damper.

Outside Air Damper

In unoccupied modes, the outside air damper operation is configurable. It can remain closed

or operate when the economizer is enabled.