Debug Table - Pfannenberg PC2500 WT CE STD Betriebs- Und Wartungsanleitung

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.
Problem
The unit does not start No supply voltage
up
Not working thermostat
The compressor protector (KLIXON,
where installed) has switched off
It works, but does not There is not enough gas in the
cool equipment
Faulty thermostatic valve
Too high heat load
Not working thermostat
Not correct flow rate on hydraulic
circuit
Problem
Switching of the high
The unit does not work.
pressure switch
The causes are:
70040-122_01-_-(PC2500_Op._Manual_IT-EN-DE-FR-ES-RU).docx
English
Cause
Refrigerant Cycle is not working
Cause
•
Dirty condenser
•
The fan is broken
•
Too high ambient
temperature
Chiller
Possible corrective Action
Check the supply main voltage line
Inspect the connection, verify the auxiliary circuit fuses and, if there is no fault,
replace the thermostat.
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
Service by a refrigeration engineer
Service by a refrigeration engineer
Possible wrong application, to be checked with our staff
Check and correct the parameter settings
Verify the regulation of hydraulic bypass where installed
Verify circuit pressure drop to reach the nominal flow rate
Possible corrective Action
Clean the condenser, in accordance with procedure described in Appendix
B1.
Replace the fan
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.
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