Kolpak PCL249LOP Manuel de service
Electrical Problems
Fuse(s) blow or circuit
breaker trips
Does the unit use circuit
breakers or fuses?
No
Replace with correct
fuse(s)
Fuse(s)
Are the fuses dual element
time delay?
No
Fan motor
Check for siezed fan motor
or bad run capacitor
Circuit breakers
Is the circuit breaker
Yes
No
Is it the
correct amp rating for
the application?
Yes Yes
Yes
Is the
fan motor or
compressor drawing
excessive current?
Replace with correct
circuit breaker
Is the amp draw
excessive at start up?
Compressor
See compressor
diagnostics
HACR rated?
No
No
Fuse blowing due to short.
Check fan motor, if OK
then see comp diagnostics
Yes
Is it the
correct amp rating for
the application?
YES
Replace
contactor.
NO
Check for voltage at
contactor coil.
Is compressor contactor
NO
Is high or low pressure
control open?
YES
pulled in?
Compressor Will Not Run
Is proper voltage
applied at load side of unit
disconnect switch?
YES
Is compressor
overload tripped?
YES
Allow time for compressor
to cool o.
NO
YES
YES
NO
Are the fuses blown
or breaker tripped in
the disconnect?
NO
Is there power at
line side of unit
disconnect switch?
NO
Check for tripped
breaker in main panel.
NO
NO
Check wiring and
repair as necessary.
YES
Determine cause
and reset.
Bad
Replace the starting
components.
Check starting
components.
Good
Check wiring and
repair as necessary.
Good
Ohm out the
compressor windings.
Replace breaker or
Refer to electrician.
Bad
Replace
compressor.
Note: The procedures described below require the skills of a competent, EPA certied refrigeration technician.
Also required are a manifold gauge set, digital thermometer with thermocouple type probe,
pressure-temperature chart and various hand tools (wrenches, service valve rachet, etc.)
Refrigeration
Install manifold gauge set onto
suction and high side service valves.
Record suction line temperature,
4" from compressor.
Record discharge line temperature,
4 to 6" from compressor.
Record liquid line temperature
before lter drier.
Compare super heat
and sub cooling.
YES
Not a refrigeration
system problem.
Is the evaporator ice covered?
YES
Is super heat within factory
specs of 10 – 12° F for freezers or
6 – 8° F for coolers?
OK
NO
NO
Check and verify
refrigerant charge.
See refrigerant
charging
procedure.
Charge OK?
YES
Is liquid sub cooling
within factory specs
of 10 – 15° F?
NOT
OK
Find and repair leak
and recharge system.
NO
YES
“Walk-in Cooler or Freezer is Too Cold”
See
See TXV
diagnostics.
YES
Is the valve
stuck closed?
YES
The TXV is correct
for the application?
YES
Thermostatic Expansion Valve (TXV ) Diagnostics
TXV is hunting and
will not hold setting.
Is the TXV sensing bulb
mounted securely to the suction
line before the “P” trap?
NO
NO
Remount sensing
valve properly.
NO
Is the valve
stuck open?
Replace TXV
and drier.
YES
Note: To check expansion valves for proper operation, immerse the sensing bulb in a
pan of warm water. DO NOT spray sensing bulb with refrigerant of any kind.
Check system for
proper operation.
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