Table 11-5.--Troubleshooting the A/M32C-17--Continued
INDICATION
PROBABLE CAUSE
SUGGESTED REMEDY
1. Hydraulic pump belt broken 1. Check fan belt and clean exterior
G. Discharge pressure too
of condenser.
high
or condenser tubes dirty
2. Air or noncondensible gas in 2. Purge and check for leaks.
system
3. Remove excess.
3. Overcharge of refrigerant,
excessively hot condenser
and discharge pressure
1. Repair leaks and recharge.
H. Discharge pressure too
1. Lack of refrigerant--
low
bubbles in sight glass
2. Remove head. Examine valves,
and replace faulty valves.
2. Broken or leaking com-
pressor discharge valve(s).
3. Inspect and repair or replace
Suction pressure rises faster
unloaders.
than 5 lb/min after pressure
4. Remove and inspect valve.
shutdown
Replace if necessary.
3. Unloader(s) stuck open
4. Leaking hot gas bypass valve
1. Refer to C above.
I.
Suction pressure too high 1. Excessive load on
evaporator--compressor
2a. Check to be sure that remote bulb
runs continuously
is firmly in contact with suction
line.
2. Over-feeding of expansion
valve--abnormally cold
2b.
Check superheat setting of
suction line; liquid feeding
expansion valve.
back to compressor
2c.
Repair or replace expansion valve.
3. Expansion valve stuck
3.
Repair or replace valve.
open--abnormally cold
suction line; liquid feeding 4.
Remove head, examine valves,
back to compressor
and replace those found to be
inoperative.
4. Broken suction valves in
compressor
1. Repair leak and recharge.
J. Suction pressure too low
1. Lack of refrigerant--
bubbles in sight glass
2. Clean or replace strainer.
2. Clogged liquid line
3. Clean or replace valve.
strainer--temperature
4. Repair or replace thermostat.
change across strainer
5. Reset compressor capacity
3. Obstructed expansion valve
control range.
4. Thermostat stuck closed
5. Compressor capacity control
set too low--compressor
short cycles
11-35
