Troubleshooting - Parker PDRD Manuel D'utilisation

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Z
7

Troubleshooting

High refrigerant
High dew
temperature.
point
HT trip.
Yes
Ambient temperature
over 122˚F (50˚C)
No
Yes
Condenser dirty
No
Yes
Fan does not work
No
Yes
Excessive thermal load
(compressor head too hot)
No
Yes
Low current consumption
No
FAULT
Compressor
noisy
Reduce
temperature condenser
Clean
condenser
Replace fan
Replace fan
Z
Compressor
No
components
Reduce compressed
perished
air quantity or air
temperature
Yes
Repair or
Insufficient
replace
refrigerant: repair any
compressor
leaks and recharge the
Z
circuit
Z
CAUSE REMEDY
Excessive High pressure
current drop on air side
consumption
Heat exchanger
Yes
Clean Condenser
fouled with
dirty
No
Clean heat
Yes
Fan does
exchanger (blow
not work
Z
compressed air in
opposite direc-
No
tion to operating
air flow). Fit/
renew prefilter
Compressor
winding insulation
Yes
partially perished
(compressor
too hot)
No
Replace
No
Ice formation
pressure switch
on evaporator
debris
(low
evaporation
Yes
pressure)
Yes
condenser
By---pass air flow
keeping air inlet
open. Open con-
densate drain
valve manually.
Restart, checking
the calibration of
the expansion
valve or hot gas
valve.
Z
4
PDRD125 ---PDRD175
High refrigerant
discharge
pressure:
HT trip.
Fan pressure/
Yes
thermostat
Z
switch (PV/TV)
calibration error
or damaged.
No
Yes
Clean Condenser
dirty
No
Yes Fan does
not work
No
Replace fan
Z
Seek external
assistance