Quincy QSF Series Instruction Manual page 44

Section VII– Troubleshooting
PROBABLE CAUSE
Low Air Delivery
Differential pilot valve not set
correctly
Air pressure switch not set correctly
Faulty receiver pressure gauge
Air pressure switch not set correctly
High Receiver Pressure
Air pressure switch not set correctly
Inlet valve not closing at lower air
demand
Blowdown valve not relieving
receiver pressure
High Discharge Air Temperature
Faulty thermal valve
Cooler plugged
Frequent Air/Fluid Separator Clogging
Faulty air filter or inadequate filter
for the environment
Faulty fluid filter
Fluid breakdown
Incorrect fluid separator element
Extreme operating conditions such
as high compressor discharge
temperatures, high ambient
temperature with high humidity and
high reservoir pressure
Mixing different grades or types of
fluids
Incorrect fluid
40
CORRECTIVE ACTION
Adjust differential pilot valve to achieve desired modulation range.
Adjust air pressure switch to achieve desired cut-in and cut-out
pressure
Check and replace as necessary.
Adjust air pressure switch to assure unload pressure does not exceed
the maximum operating pressure.
Adjust air pressure switch to assure unload pressure does not exceed
maximum recommended operating pressure.
Correct in accordance with instruction on "Inlet valve not opening or
closing in relation to air demand" section of this troubleshooting
guide.
Check control solenoid and blowdown valve.
Replace thermal valve element.
Clean cooler, find and correct cause of contamination.
If faulty air filter elements, replace them. If air filter is inadequate for
the environment, relocate the intake air to a clean source.
Replace fluid filter element.
Correct in accordance with the instruction in "Fluid Breakdown"
section of the troubleshooting guide.
Use genuine Quincy replacement elements only.
Operate compressor at recommended reservoir pressure and air
discharge temperature.
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.
Follow compressor fluid specifications as described in lubrication
section of this manual.
Quincy Compressor – QSF Series