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13-21-615 v01 Page 79
SECTION 9
TROUBLESHOOTING
SYMPTOM
POSSIBLE CAUSE
REMEDY
Compressor fails to start
1.
Wrong lead connections.
1.
Change leads.
2.
Blown fuses in control
2.
Replace fuse.
box.
3.
Motor starter overload
3.
Reset and investigate
tripped.
cause of overload.
4.
Pressure in reservoir.
4.
Inspect blowdown valve.
5.
Read error message on
5.
Take appropriate action.
control panel
6.
Remote Contact is open
6.
Replace switch or jumper.
(terminals A6 & B6).
Compressor starts but
stops after a short time
1.
High discharge
temperature.
1.
See “High Discharge Air
Temperature,” this
section.
2.
Blown fuse in starter/
2.
Replace fuse (investigate
control box.
if fuses continue to blow).
3.
Motor starter overload
3.
Reset and investigate
heaters trips.
cause of overload.
Compressor does not
unload (or load)
1.
Improperly adjusted
control.
1.
Refer to Controller Manual
13-17-621 and adjust
control.
2.
Air leak in control lines.
2.
Determine source of leak
and correct.
3.
Restricted control line.
3.
Clean control lines.
4.
Blowdown valve
4
Repair, clean or replace
malfunction.
valve.
Compressor cycles from
load to unload
excessively
1.
Insufficient receiver
capacity.
1.
Increase receiver size.
2.
Restriction in service
2.
Inspect and clean service
piping
piping.
3.
Restriction in control
3.
Inspect and clean control
tubing.
tubing.
4.
Plugged aftercooler.
4.
Inspect and clean
aftercooler.