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| ComPak
®
Series - Installation, Operation and Maintenance
Building Fire Control System (9)
The CPCS-PCP can receive a contact closure signal from a building fire control system. This input of the
controller must be connected to dry (voltage free) contacts only. When this input receives a contact closure,
the ComPak® unit compressor and fan will be shut down and the remote interface unit will show an alarm
condition. When the contact closure opens, The ComPak® unit will resume normal operations. It is possible to
change the operation of the fire trip input to be active on open instead of close. See CPCS-PCP Service in the
Operation section for further explanation.
Return Air Sensor (10)
The return air sensor measures air temperature and relative humidity. The sensor is normally factory mounted in
the ComPak® unit return air section. However, with the optional economizer it is necessary to field mount this
sensor in the duct work. The sensor must be located in the return duct upstream of the exhaust duct connection.
(See Figure 4-6. Economizer Operation
for a typical location of the sensor in the economizer system.)
When field mounting is necessary, the sensor will be provided from the factory and must be field wired using
22 AWG, copper 4-conductor, shielded, twisted-pair cable.
Purge Mode Input (11)
The CPCS-PCP can receive a contact closure signal from an external source to activate purge mode operation.
During purge mode, the compressor is disabled and the economizer output is activated to bring in 100%
outside air.
AC Proof Input (12)
An optional interlock used with certain types of heat rejection condensers. Dry contact closure indicates a
problem and prevents compressor operation in air cooling mode.
Pool Water Temperature Sensor (13)
Units equipped with a pool water heating condenser require installation of factory supplied pool water
temperature sensor. It must be mounted upstream of the ComPak® and the auxiliary water heater. The sensor
can be threaded directly into a 1⁄4” FPT fitting. Electrical connection should be made with 22 AWG copper,
2 conductor, shielded, twisted-pair cable. Connect the shield drain wire to ground at the ComPak® end only.
