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A special case of the Low Suction Pressure Alarm activating is when the unit is selected as a heat pump
and the compressor is used for heating. In this case, the Low Suction Pressure Setpoint is determined
by the glycol ratio setting in the service setpoints. The Calculated Suction Pressure Setpoint is shown
as well as the Loop Temperature Limit. In this state, the unit will stop and not restart until the suction
pressure rises 20 psi above the Low Suction Pressure Trip Setpoint. Although the unit will restart
automatically, the red ALARM LED on the display will stay lit until the alarm is acknowledged.
2.5.3 - General Fault
The General Fault Alarm will be active whenever the input from 7R is made. This alarm is a
combination of the compressor and blower overload relays as well as the optional low voltage
monitor, water overflow switch and a low water flow switch. Although the unit will restart
automatically when these conditions clear, the red ALARM LED on the display will stay lit until the
alarm is acknowledged.
Figure 43
2.5.4 - High Discharge Pressure
The High Discharge Pressure Alarm will be active whenever the Discharge Pressure rises above the
High Pressure Trip Setpoint on the Factory Configuration Screen. In this state, the unit will stop and
not restart until the alarm condition is reset manually on the Alarm Screen. The red ALARM LED on
the display will stay lit until the alarm is reset.
Figure 44
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CM3500 Controller - ClimateMaster DOAS Water-Source Heat Pumps - Rev.: 7 Oct, 2008B