Quincy QSF Series, Instruction Manual

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Section VII– Troubleshooting
PROBABLE CAUSE CORRECTIVE ACTION
Low Air Delivery
Differential pilot valve not set
correctly Adjust differential pilot valve to achieve desired modulation range.
Air pressure switch not set correctly Adjust air pressure switch to achieve desired cut-in and cut-out
pressure
Faulty receiver pressure gauge Check and replace as necessary.
Air pressure switch not set correctly Adjust air pressure switch to assure unload pressure does not exceed
the maximum operating pressure.
High Receiver Pressure
Air pressure switch not set correctly Adjust air pressure switch to assure unload pressure does not exceed
maximum recommended operating pressure.
Inlet valve not closing at lower air
demand Correct in accordance with instruction on “Inlet valve not opening or
closing in relation to air demand” section of this troubleshooting
guide.
Blowdown valve not relieving
receiver pressure Check control solenoid and blowdown valve.
High Discharge Air Temperature
Faulty thermal valve
Replace thermal valve element.
Cooler plugged Clean cooler, find and correct cause of contamination.
Frequent Air/Fluid Separator Clogging
Faulty air filter or inadequate filter
for the environment
If faulty air filter elements, replace them. If air filter is inadequate for
the environment, relocate the intake air to a clean source.
Faulty fluid filter Replace fluid filter element.
Fluid breakdown Correct in accordance with the instruction in “Fluid Breakdown”
section of the troubleshooting guide.
Incorrect fluid separator element Use genuine Quincy replacement elements only.
Extreme operating conditions such
as high compressor discharge
temperatures, high ambient
temperature with high humidity and
high reservoir pressure Operate compressor at recommended reservoir pressure and air
discharge temperature.
Mixing different grades or types of
fluids DO NOT MIX DIFFERENT GRADES OR TYPES OR FLUID. DO NOT
MIX FLUIDS FROM DIFFERENT MANUFACTURERS. Follow
compressor fluid specifications as described in lubrication section of
this manual.
Incorrect fluid Follow compressor fluid specifications as described in lubrication
section of this manual.
Quincy Compressor – QSF Series
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