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13
TROUBLESHOOTING
PROBLEM
CAUSE
CORRECTION
Oil/Water Mist
Spraying from
Under Pres-
sure Switch
The unit is collecting excess water in
the moisture filter #31716 and oil tank
which is raising oil level and resulting in
oil/water being forced into the white ny-
lon discharge hose going to the unloader
valve under the pressure switch.
Refer to
OIL TANK CONDENSATION DRAIN
for preventing condensation build up
by draining it regularly.
Unit Does Not
Turn On or Run
No power to unit or defective pressure
switch.
Check breaker is not tripped. If breaker is Ok – disconnect unit from power.
Check Continuity across switch terminals. A good switch will show continuity
across both sets of terminals, if one set of terminals is OPEN switch is bad.
Replace pressure switch #32207.
Motor Runs
Slow or Hard
to Start
Improper Supply Voltage/Circuit.
Assure unit has actual 208/240 on min 30-amp circuit and not 120VAC.
Defective start and/or run capacitor.
Disconnect unit from power.
• Remove Motor Electric Box Cover (on top of motor).
• Look at both capacitors for leaking oil, black soot, bloated or cracked cases.
• If defective- replace capacitors and motor controller.
Replace Start Capacitor #32213.
Replace Run Capacitor #32214.
Replace Motor Controller #32215.
Air Discharges
From Under
Pressure
Switch When
Unit Shuts Off
at 145 PSI
The Unloader Valve is located below the
Pressure Switch and is in place to relive
air pressure from the Scroll Pump and
Oil Tank. This discharge will last up to
20 seconds and is necessary to relive
air pressure in the Pump before next
cycle starts to eliminate starting against
a head pressure.
This is normal operation.
Overpressure
Relief Valve
Opens. Unit
Will Not Shut
Off.
Pressure Switch is stuck in “ON”
position- unit will continue to run even
if pressure switch knob is turned to
“OFF”. Unit will continue to vent through
Overpressure Relief Valve.
Replace Pressure switch #32207.
Motor Makes
Loud Metallic
Grinding Noise
Motor is defective from either bearing
failure, oil starvation or overheating.
Replace the following item:
Motor/Pump assembly #32208.
Squeaking/
Chatter Noise
at Air Filter
When Unit
Starts
Aluminum cylinder below air filter hous-
ing is the Intake Check valve. The valve
seal is making the noise.
It will not harm or hinder performance of unit and will cease after a few cycles.
