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Table 16 – Controller Control Fault Logic
Fault
Alarm
Indication
Pump
Shut
Off
Compressor
Shut Off
Alarm
Reset
Required
1
Manual
Reset
Required
2
Remote
Alarm
Activated
3
Low Reservoir
Level
The Reservoir Level Light flashes red
Yes
Yes
Yes
Yes
Yes
Temperature Limit
Safety
The Set Point and Process
Temperatures Flash and the
Temperature Limit Light flashes red
Yes
Yes
Yes
No
Yes
Temperature Limit
Warning
The Temperature Limit Light flashes
yellow
No
No
Yes
No
Yes
Pump Motor
Overload
The Pump Light flashes red
Yes
Yes
Yes
Yes
Yes
Compressor
Motor Overload
The Compressor Light flashes red
No
Yes
Yes
No
Yes
High Refrigerant
Pressure
The High Refrig Pressure Light flashes
red
No
Yes
Yes
Yes
Yes
Low Refrigerant
Pressure
The Low Refrig Pressure Light flashes
red
No
Yes
Yes
No
Yes
Low Evaporator
Temperature
The Freezestat Light flashes red
No
Yes
Yes
No
Yes
Supply Probe
Fault Hi
The Set Point Temperature Display
shows “PRS” and the Process
Temperature Display shows “EHi”
Yes
Yes
Yes
No
Yes
Supply Probe
Fault Lo
The Set Point Temperature Display
shows “PRS” and the Process
Temperature Display shows “ELo”
Yes
Yes
Yes
No
Yes
Return Probe
Fault Hi
The Set Point Temperature Display
shows “PRR” and the Process
Temperature Display shows “EHi”
Yes
Yes
Yes
No
Yes
Return Probe
Fault Lo
The Set Point Temperature Display
shows “PRR” and the Process
Temperature Display shows “ELo”
Yes
Yes
Yes
No
Yes
Freezestat Probe
Fault Hi
The Set Point Temperature Display
shows “PRF” and the Process
Temperature Display shows “EHi”
Yes
Yes
Yes
No
Yes
Freezestat Probe
Fault Lo
The Set Point Temperature Display
shows “PRF” and the Process
Temperature Display shows “ELo”
Yes
Yes
Yes
No
Yes
Brownout
The Set Point Temperature Display
shows “Brn” and the Process
Temperature Display shows “Out”
Yes
Yes
Yes
No
Yes
3-Phase Power
Error
The Electrical Phase Error list flashes
red
Yes
Yes
Yes
No
Yes
Low Flow
The Low Flow Light flashes red
Yes
Yes
No
No
Yes
1
Alarm Silence/Reset button on control panel must be pressed.
2
Safety control device must be manually reset before the controller can be reset.
3
Activates the alarm horn and closes the alarm contact if the remote alarm contact option has been purchased.
