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WC-IOM-7 • Packaged Heat Pump 9
General Information
Compressor Disable (CPR1/2)
This input incorporates the low pressure control (LPC) of each refrigeration
circuit and can be activated by opening a field supplied contact installed on the
LTB.
If this circuit is open before the compressor is started, the compressor will not be
allowed to operate. Anytime this circuit is opened for 1 continuous second during
compressor operation, the compressor for that circuit is immediately turned
“Off”. The compressor will not be allowed to restart for a minimum of 3 minutes
should the contacts close.
If four consecutive open conditions occur during the first three minutes of
operation, the compressor for that circuit will be locked out, a diagnostic
communicated to the remote panel (if installed), and a manual reset will be
required to restart the compressor.
Low Pressure Control
ReliaTel Control
When the LPC is opened for 1 continuous second, the compressor for that circuit
is turned off immediately. The compressor will not be allowed to restart for a
minimum of 3 minutes.
If four consecutive open conditions occur during the first three minutes of
operation, the compressor will be locked out, a diagnostic communicated to
ICSTM if applicable, and a manual reset will be required to restart the
compressor.
High Pressure Control (Optional)
ReliaTel Control
The high pressure controls are wired in series between the compressor outputs
on the RTRM and the compressor contactor coils. If the high pressure control
switch opens, the RTRM senses a lack of current while calling for cooling and
locks the compressor out.
On dual circuit units, if the high pressure control opens, the compressor on the
affected circuit is locked out. A manual reset for the affected circuit is required.
Power Exhaust Control (Optional)
The power exhaust fan is started whenever the position of the economizer
dampers meets or exceed the power exhaust setpoint when the indoor fan is on.
The setpoint panel is located in the return air section and is factory set at 25%.