COMPRESSOR
THERMAL
PROTECTOR SWITCH
OPEN
TROUBLESHOOTING CHART (Continued)
1.
2.
3.
4.
5.
6.
7
Low voltage during
high
load conditions
Defective
or grounded
wiring
in
motor
Loose power
wiring
High
condensing temperature.
Power
line
fault
causing
unbalanced voltage.
High
ambient
temperature around the overload relay
Failure
of second starter to pull
in
on part
winding
start
systems
1. Operating beyond
design
conditions
2.
Discharge
valve partially shut.
3 Blown valve plate gasket
1
2.
3
4.
5
6.
7.
Check supply voltage for excessive line drip.
Replace compressor motor.
Check all connections and tighten.
See Corrective Steps for high discharge pressure.
Check supply voltage. Notify power company. Do not
start until fault is corrected.
Provide
ventilation to reduce heat.
Repair
or replace starter or time delay
mechanism
1
Add
facilities
so
conditions
are within allowable
limits.
2 Open valve.
3 Replace gasket
IM
269
/
Page
59
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