Quincy Compressor QGD 40, Instruction Book

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Condition Fault Remedy
Insufficient cooling air or cooling air
temperature too high Check for cooling air restriction or
improve ventilation of the
compressor room. Avoid
recirculation of cooling air. If
installed, check capacity of
compressor room fan
Oil cooler clogged Clean cooler
Bypass valve malfunctioning Have valve tested
Air cooler clogged Clean cooler
Compressor element out of order Consult your supplier
Cooling air fan does not deliver
enough air. Unit shuts down due to
overtemperature, fan overload, too
high oil consumption or less FAD. Fan rotates in the wrong direction
due to wrong electrical
connection.
Faults and remedies, dryer
For all references hereafter, consult section Air dryer .
Condition Fault Remedy
Pressure dew point too high Air inlet temperature too high Check and correct; if necessary, clean the
aftercooler of the compressor
Ambient temperature too high Check and correct; if necessary, draw
cooling air via a duct from a cooler place or
relocate the compressor
Shortage of refrigerant Have circuit checked for leaks and
recharged
Refrigerant compressor does
not run See below
Evaporator pressure too high See below
Condenser pressure too high See below
Condenser pressure too high
or too low Fan control switch out of
order Replace
Fan blades or fan motor out of
order Have checked fan/fan motor, if necessary
replace.
Ambient temperature too high Check and correct; if necessary, draw
cooling air via a duct from a cooler place or
relocate the compressor
Condenser externally clogged Clean condenser
Compressor stops or does not
start Electric power supply to
compressor is interrupted Check and correct as necessary
Thermal protection of
refrigerant compressor motor
has tripped Motor will restart when motor windings have
cooled down
Instruction book
2920 7190 02 95