Quincy Compressor QOF 2 - Page 39

Section VII - Problem solving
Quincy Compressor 35
Condition Fault Remedy
Compressor
overheating and/
orshut-downby
air temperature
switch(TSHH)
Insufcientcompressorcooling
Clean compressor element fins
and fan, see section Cleaning.
Improveventilationof
compressor room, see section
Installationproposal.
Resetoverloadrelay(F21)if
necessary.
Coolingfans(FN1andFN2)out
of order.
Checkandcorrect,reset
overloadrelay(F21)ifnecessary.
Temperatureshutdownswitch
out of order.
Replace switch.
Refrigerant dryer
Forcompressorswithabuilt-inrefrigerantdryeralso:
Condition Fault Remedy
Dewpointtoo
high
Airinlettemperaturetoohigh
Checkandcorrect;seesection
Reference conditions and
limitations
Fusesblown
Checkfusesandremedythe
cause.
Shortage of refrigerant
Have circuit repaired or
recharged.
Refrigerant compressor does not
run
See below
Evaporatorpressureistoohigh See below
Condenser pressure is too high See below
Condenser
pressure too high
or too low
Fancontrolswitchoutoforder Have switch replaced
Condenser fan motor out of
order
Have fan motor inspected
Ambient temperature too high
Improve ventilation of
compressor room, see section
Installation proposal
Condenser externally clogged Clean condenser
Motor of
refrigerant
compressor stops
or does not start
The internal thermal protection
of the motor has tripped
Compressor will restart when
the motor windings have cooled
down.
Electric power supply to
refrigerant compressor
interrupted
Check and correct as necessary
Evaporator
pressure is too
high or too low
Condenser pressure too high or
too low
See below
Shortage of refrigerant
Have circuit repaired or
recharged
Hot gas bypass valve incorrectly
set or out of order
Have the valve adjusted or
replaced