M
A
INTEN
A
NCE
Défaut Cause probable Action requise
1. Suction temperatur
high
Too much suction gas superheat
(above 20 K)
Examine and adjust the thermostatic
expansion valve in the evaportors
Suction Temperature
low
Liquid in the suction line
just the thermostatic expansi
is loose or incorrectly
itioned
Check if the sensor is in contact with
the
suction line and replace if
cessary
tion pressure too
point wrongly set
much oil in the evaporato
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
just thermostatic expansion va
tallation insufficiently
arged
rge the installation with
frigerant
4. Compressor cuts in
out too often on LP saf
switch
Evaporator iced over or frozen
w
ater present in the distributor
ean or defrost evaporator
Suction pressure too h
Set a MOP on the evaporator
con
troller (see P 24)
Gas cooler pressure t
high
Insufficient flow of air into
the gas cooler
Clean the gas cooler. Check motor
fans
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
just
8. Discharge temperatu
too high
Too much superheat on suction
Adjust thermostatic expansion valves
9. Capacity too high
Problem with control system or
ot
her automatic devices
lace, repair or re-set
o correspondance between t
it and the cooling demand
ck the design of the installati
10. Insufficient capac
Problem with control system or
ot
her automatic devices
lace, repair or re-set
o correspondance between t
it and the cooling demand
ck the design of the installati
33
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