4500P-7500 USER MANUAL SECTION
64
TABLE 6-1: TROUBLE SHOOTING GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
Line pressure rises above unload
pressure set-point (continued)
Defective blowdown valve Check the receiver tank to ensure
that it is exhausting air to the
atmosphere when the solenoid
opens - repair or replace if
necessary.
High compressor fluid
consumption
Clogged return line or orifice Clean or replace the strainer.
Separator element damaged or
malfunctioning
Change separator.
Lubrication system leak
Check all pipes, connections, and
components.
Excess fluid foaming Drain fluid and change.
Fluid level too high Drain and change - check that the
compressor temperature has not
dropped below 170ºF (76.7ºC).
Pressure relief valve opens
frequently
Pressure relief valve defective Replace.
Plugged/obstructed separator Check separator differential.
Liquid water in compressed air
lines
Plugged/obstructed strainer in
the moisture drain line
Clean the strainer located in the line
off of the bottom of the water
separator.
Defective solenoid drain valve Ensure that the valve opens when it
receives a signal from the WS
Controller.
Improper drain timer settings Check WS Controller drain interval
and drain time settings, and adjust to
match the conditions - settings will
vary with the humidity.
Water vapor condensation can
be caused by the cooling/
compression operation if the
compressor and ambient
conditions (temperature and
humidity)
Install a compressed air dryer that
can supply the proper amount of
moisture reduction for the
compressor’s output - if required,
install filters to remove particulates,
liquid oil aerosols, or oil vapors -
check and maintain all drain traps.
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