Parker Hiross Polestar-Smart Series User Manual page 14

English
7 Troubleshooting
CP
compressor
thermal protection
alarm
High current ab-
Compressor
sorption
noisy
Compressor
No
Condenser dirty or
components
obstructed
perished
Yes
The compressor
works in the op-
Yes
posite direction
Yes
No
invert
the phases
Compressor
fault
Yes
Repair or
Compressor
Yes
replace
winding with
compressor
partial loss of
Z
insulation
No
FAULT
Lt Low evaporation
temperature alarm Ld
pressure alarm
Low dew point alarm.
LP
Yes
Clean
Low pressure
condenser
switch fault
Yes
Low
Increase
cooling
cooling air
air
temperature
temperature
No
Replace
Fan
Yes
pressure
always
switch
working
Z
(PV pressure
switch fault)
Liquid line
solenoid valve
No
closed
Hot gas
Yes
valve
Yes
not calibrated
Replace
Calibrate
the coil
valve
Z
No
Z
PST 120-350
REMEDY
CAUSE
LP Low
High dew point
refrigeration compressor
operating?
Replace
pressure
switch
Z
No
Excessive thermal load
(air fl ow, inlet temperature)
No
Replace
Fan pressure
Yes pressure
switch (PV) not
switch
set
Z
No
No
Yes
Low current refrigerant
recharge
absorption
Z
No
No
Request external
assistance
ST thermostat tripped
Decrease
Yes
Cooling air high tem-
cooling air tem-
perature
perature
No
Decrease
Yes
compressed air
quantity tempera-
ture
No
Condenser
Yes
Clean
dirty or ob-
condenser
structed
No
Replace pres-
Yes
Low current Z
sure switch
absorption
No
Replace fan
Z
6/6
HP pressure switch
tripped
Yes
Cooling air high
temperature
No
Excessive thermal
Yes
load (inlet air fl ow,
temperature)
No
Yes
Condenser dirty or
obstructed
No
Fan does
Yes
not turn (PV pres-
sure switch fault)
No
Yes
Fan fault
No