Troubleshooting Polycold Cryochiller
HMI and Observed Errors Installation and Operation Manual
Brooks Automation
10-6
214072 Revision B
Pressure Related Troubleshooting
Problem / HMI Display Possible Cause Corrective Action
DIFFERENTIAL PRESSURE PT1 > PT2 Differential 20psi
PT1 = Suction Pressure Trans-
ducer
PT2 = Discharge Pressure
Transducer
Alarm L1
Pressure Sensor Fault
Contact Authorized Service
HIGH SUCTION PRESSURE PT1 > 270 psi
PT1 = Suction Pressure Trans-
ducer
Alarm L1
Escessive Suction Pressure
Contact Authorized Service
REF PRESSURE SWITCH
NO RECOMMENDATION
Fault LED is Red
Refrigerant Discharge Pressure
Switch has activated.
Contact authorized Service
LOW SUCTION PRESS
REFRIGERANT LEAK
CHECK
BALANCE PRESSURE
Fault LED is Amber
A low suction pressure
condition has occurred.
Check system balance pres-
sure. See Appendix H: Rapid
Balance Pressure Check on
page 12-19
If pressure has dropped, check
for leak
Contact authorized service
HIGH DISCHRG PRESS
EXCESSIVE HEAT LOAD
Fault LED Red
Discharge pressure is too high Review application to ensure it
is within the capability of the
unit.
Check for excessive heat load.
Make sure all thermal radiation
shields are in place.
Ensure that the unit has a mini-
mum of 5 minutes in Standby
before switching to cool.
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