Polycold Cryochiller Troubleshooting
Installation and Operation Manual Remote Monitor Troubleshooting
Brooks Automation
214072 Revision B
10-11
Bit 2
Freeze out prevention active
Fault LED Amber
Compressor ON
Coldest Liquid Temperature
(TC4)
(6C low-side dead band in effect
when FRZ_RREVENT_SETPT >
-158C)
When FRZ_PREVENT_SETPT
> -158C, then Alarm when TC4
is lower than 6C below
FRZ_PREVENT_SETPT
When FRZ_PREVENT_SETPT
< -158C, then...
Alarm when TC4 is lower than
FRZ_PREVENT_SETPT
Warning L2
Check freezeout prevention
valve.
Check freezeout TC installation
and operation.
Bit 3 Not used N/A N/A
Bit 4
Differential Pressure
Fault LED Amber
Compressor OFF
PT1 > PT2 Differential 20psi
PT1 = Suction Pressure Trans-
ducer PT2 = Discharge Pressure
Transducer
Alarm L1
Pressure Sensor Fault
Contact Authorized Service
Bit 5
High Suction Pressure
Fault LED Amber
Compressor ON
Suction Pressure Transducer
(PT1)
PT1 > 270 psi
Alarm L1
Escessive Suction Pressure
Contact Authorized Service
Bit 6 Not used N/A N/A
Bit 7
High discharge pressure
Fault LED Red
Compressor OFF
Pressure Transducer PT2 shows
high discharge pressure which
indicates excessive heat load
PT2 > 3102.6kpa (450 psi)
Alarm L1
Check system load and perfor-
mance
Bit Mask Value / Problem Possible Cause Corrective Action
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