Parker PDRD Manuel D'utilisation page 136

Z
7 Troubleshooting
CP
compressor
Compressor
thermal protec-
noisy
tion alarm
Compressor Condenser
components dirty or
deteriorated obstructed
no
yes no
Repair or
Compressor
replace
yes
winding
compressor
with partial
Z
loss of
insulation
no
English
FAULT
Lt Low evaporation temperature alarm
Ld Low dew point alarm.
Low
yes
cooling
air
temperature
no
Fan
yes
always
working
(PV pressure
switch fault)
no
Hot gas
yes
valve
not calibrated
no
yes Clean
condenser
yes
Replace
the coil
Z
CAUSE REMEDY
LP Low
pressure
alarm
Increase LP
yes
cooling air
Low pressure
temperature
switch fault
no
Replace
pressure switch
Z
(air flow, inlet temperature)
no
Calibrate
valve
Z
Fan
pressure switch
(PV) not set
no
Liquid line Low
solenoid valve current
closed absorption
no
no
Request external assistance
Ht
High
High
dew point
temperature
warning
alarm
Cooling
Replace
yes
air
pressure
high
switch
temperature
Z
no
Excessive thermal load yes
no
Replace
Condenser
yes yes
pressure switch
dirty or
Z
obstructed
no
No
Low
yes yes
refrigerant.
current
Recharge
absorption
Z
no
HP
high pressure
alarm
Cooling
Decrease
yes
air
cooling air
high
temperature
temperature
no
Decrease
Excessive
yes
compressed
thermal load
air quantity
(inlet air flow,
temperature
temperature)
no
Condenser
yes
Clean
dirty or
condenser
obstructed
no
Fan
Replace
yes
does not turn
pressure switch
(PV pressure
Z
switch fault)
no
Fan
Replace fan yes
Z fault
no
7
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