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DIRECT SUPPORT MAINTENANCE AIR CONDITIONER, HORIZONTAL, COMPACT - TM-9-4120-428-140065
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TM-9-4120-428-14 Air Conditioner Horizontal Compact 9000 BTU/HR 208 Volt Three Phase 400 Hertz Model No. F9000H-4SPFI Manual
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INSUFFICIENT COOLING - TM-9-4120-428-140068
TM 9-4120-428-14
DIRECT SUPPORT MAINTENANCE
AIR CONDITIONER, HORIZONTAL, COMPACT
OPERATIONAL CHECKOUT AND TROUBLESHOOTING PROCEDURES
NOTE
Before proceeding with the troubleshooting procedures, check Troubleshooting
Procedures for Unit Maintenance.
TROUBLESHOOTING PROCEDURE
COMPRESSOR WILL NOT START.
SYMPTOM
The compressor will not start.
MALFUNCTION
The LOW and HIGH-pressure switches are tripped.
CORRECTIVE ACTION
Check that both the LOW and HIGH PRESSURE switches are not tripped. To
reset, press and release the LOW and HIGH PRESSURE switches. If the switch
does NOT stay in, check and/or replace the switches. (WP 0084 00) and (WP
The compressor motor thermal cutoff switch is not operational.
CORRECTIVE ACTION
Conduct an operational check on the compressor motor thermal cutoff switch. If
the thermal cutoff switch is defective, replace the compressor. (WP 0090 00).
The compressor shows signs of burnout.
CORRECTIVE ACTION
Replace the compressor if it shows signs of burn out. (WP 0090 00).
TROUBLESHOOTING PROCEDURE
COMPRESSOR SHORT CYCLES
SYMPTOM
The compressor short cycles.
MALFUNCTION
The head pressure is either too high or too low.
CORRECTIVE ACTION
1. Check the head pressure (high pressure side). (WP 0000 00).
a)  If the pressure is too high, check the HIGH PRESSURE cutout switch and
replace if defective. (WP 0083 00).
b) If the pressure is excessive and the sight glass is clear, release any excess
refrigerant. Release the pressure until the requirements of (WP 0074 00) are met.
2. Check the head pressure (low pressure side) and add refrigerant if low.
0012 00-1

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