HIGH RESERVOIR PRESSURE
I
PROBABLE CAUSE
I
CORRECTION
I
lAir pressure switch not set correctly.
lReadjust the air pressure switch so that the unload I
I
Ipressure does not exceed the maximum recommended ]
operating pressure.
Inlet valve not closing at lower air demand.
Correct the situation in accordance with the instructions
in “Inlet Valve not Opening or Closing in relation to
Air Demand” section of this trouble shooting guide.
Blowdown valve not relieving receiver pressure.
Check control solenoid and blowdown valve.
HIGH DISCHARGE AIR TEMPERATURE
PROBABLE CAUSE
CORRECTION
Not enough cooling water flowing through cooler
Check water system for possible restrictions, including
(water cooled models only).
water temperature regulating valve. Clean or adjust, if
necessary.
L
Inadequate circulation of cooling air at the cooler
Check the location of the cooler to make sure that there
(air-cooled models only).
is not restriction to free circulation of cooling air. Also
check fins at the cooler and if found dust laden, clean
them with air while the machine is not running.
Low fluid level in the reservoir.
Add fluid and bring fluid level to recommended level.
Also check the fluid system for possible leaks.
Fluid filter plugged.
Replace plugged fluid filter.
4
Clogged fluid cooler.
Check fluid cooler for varnishing and rust deposits. If
this condition exists, then clean cooler thoroughly in
accordance with recommended procedures of the heat
exchanger manufacturer.
Excessive ambient temperature (air-cooled units).
Maximum ambient for proper operation is 110° F.
Incorrect fan rotation.
Correct rotation is with the fan pushing the air up
through the coolers. Reverse motor starter lads L1 and
L2.
Incorrect fluid.
Use recommended fluids only. See lubrication section.
Clogged air filter.
Clean or replace as necessary.
Faulty thermal valve.
Repair or replace as necessary.
Faulty gauges.
Check and replace as necessary.
Air end failure.
Contact a Quincy authorized distributor.
59
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