Profroid QuietCO2OL Series - Page 37

MAINTENANCE
33
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Cause probable
Action requise
1. Suction temperature too
high
Too much suction gas superheat
(above 20 K)
Examine and adjust the thermostatic
expansion valve in the evaportors
2. Suction Temperature too
low
Liquid in the suction line
Adjust the thermostatic expansion
valve
Sensor is loose or incorrectly
positioned
Check if the sensor is in contact with
the suction line and replace if
necessary
3. Suction pressure too low
Set point wrongly set
Check the set point
Too much oil in the evaporators
Clear out the oil from the
evaporator
Filter in the liquid line clogged
Examine and clean filters in liquid
line
Too much superheat of
suction gas
Adjust thermostatic expansion valves
Installation insufficiently
charged
Charge the installation with
refrigerant
4. Compressor cuts in and
out too often on LP safety
switch
See point 3
Evaporator iced over or frozen
water present in the distributor
Clean or defrost evaporator
5. Suction pressure too high
MOP
Set a MOP on the evaporator
controller (see P 24)
Restart after defrost
Wait for confirmation
Compression problem
Change compressor
6. Gas cooler pressure too
high
Insufficient flow of air into
the gas cooler
Clean the gas cooler. Check motor
fans
Installation overcharged
Drain liquid into reservoir
Air or non-condensable gas in the
HP circuit
Drain, use a vacuum pump and
recharge
7. Gas cooler pressure too
low
Fan cut-in incorrectly set
Adjust
8. Discharge temperature
too high
Too much superheat on suction
Adjust thermostatic expansion valves
Internal by-pass
Check compressors
9. Capacity too high
Problem with control system or
other automatic devices
Replace, repair or re-set
No correspondance between the
unit and the cooling demand
Check the design of the installation
10. Insufficient capacity
Problem with control system or
other automatic devices
Replace, repair or re-set
No correspondance between the
unit and the cooling demand
Check the design of the installation