Debug Table - Pfannenberg EB 2.0 Series Operating And Maintenance Instructions Manual

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 low The unit works for short periods, it
pressure switch stops and starts again after a while.
The causes are:
•
•
Switching of the high The unit does not work.
pressure switch
The causes are:
70040-106_01-C_EN-DE-IT_comp.doc
English
Cause
Refrigerant Cycle is not working
Cause
Low gas level in the equipment
Outlet line of the compressor is
blocked and more in detail:
satured dehydrating filter,
blocked thermostatic valve.
•
Dirty condenser
•
The fan is broken
•
Wrong fan rotating direction Verify the connection on the terminal board of the electrical box
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.
Important: After the shut down of the compressor, the resetting time will
depending on the environment of the compressor: In a hot closed
environment it will be 2 hours, in ventilated 1 hour.
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
Service by a refrigeration engineer
Clean the condenser with compressed air if it is full of dust, or use proper
solvents suitable to remove sludges.
Replace the fan
16