Pfannenberg PC2500 WT CE STD, Operating And Maintenance Instructions Manual

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English
70040-122_01-_-(PC2500_Op._Manual_IT-EN-DE-FR-ES-RU).docx 15
Debug Table
The information described below are useful for the service staff. The faults that require the intervention of a refrigeration
engineer must be carried out only by specialized staff. Follow all electrical legislation when working on the unit based on valid
laws of the countries were the unit is placed.
Chiller
Problem Cause Possible corrective Action
The unit does not start
up
No supply voltage Check the supply main voltage line
Not working thermostat Inspect the connection, verify the auxiliary circuit fuses and, if there is no fault,
replace the thermostat.
The compressor protector (KLIXON,
where installed) has switched off Note: The compressors are protected against high temperatures and
currents, with of an internal or external device (Klixon). The internal/external
device protects the compressor against the following situations:
•
overheating due to an inadequate cooling of the compressor motor.
•
Blocked compressor due to a high temperature of the motor or a high
current.
•
Loose connections which may cause high currents
It works, but does not
cool There is not enough gas in the
equipment Service by a refrigeration engineer
Faulty thermostatic valve Service by a refrigeration engineer
Too high heat load Possible wrong application, to be checked with our staff
Not working thermostat Check and correct the parameter settings
Not correct flow rate on hydraulic
circuit Verify the regulation of hydraulic bypass where installed
Verify circuit pressure drop to reach the nominal flow rate
Refrigerant Cycle is not working
Problem Cause Possible corrective Action
Switching of the high
pressure switch The unit does not work.
The causes are:
•
Dirty condenser
Clean the condenser, in accordance with procedure described in Appendix
B1.
•
The fan is broken
Replace the fan
•
Too high ambient
temperature
Check that the chiller is located in a place that can guarantee suitable
ventilation of the refrigerating unit.
Check that the ambient temperature does not exceed the max T indicated on
the chiller label.