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 TM 5-4120-341-13
3. EXCESSIVE NOISE
Inspect circulating fan for damage and security of attachment.
Step 1.
Tighten setscrews in hub of circulating fan and any other loose mounting hardware or
replace damaged circulating fan (para. 4-22).
Inspect condenser fan for damage and security of attachment.
Step 2.
Tighten setscrews in hub of condenser fan and any other loose mounting hardware or
replace damaged condenser fan (para. 4-21).
Inspect fan motor for wear and damage.
Step 3.
Replace damaged fan motor (para. 4-20).
Step 4.
Check to see if compressor is knocking or chattering.
Stop air conditioner and report condition to direct support maintenance personnel.
FANS
1. CIRCULATING FAN FAILS TO OPERATE
Step 1.
Check to see if main power cord is plugged in.
Connect power cord to receptacle supplying 115 VAC, single phase, 60 Hz power.
Step 2.
Test fan motor for resistance.
Consult Appendix F and replace fan motor if damage is indicated (para 4-20).
Step 3.
Check circulating fan for damage or binding.
Relieve binding or replace damaged circulating fan (para. 4-22).
Step 4.
Test fan motor capacitor for continuity leakage and capacitance.
Replace capacitor if damage is indicated (para. 4-25).
2. CONDENSER FAN FAILS TO OPERATE
Step 1.
Check to see if main power cord is plugged in.
Connect power cord to receptacle supplying 115 VAC, single phase, 60 Hz power.
Step 2.
Test fan motor for resistance.
Consult Appendix F and replace fan motor if damage is indicated (para. 4-20).
Step 3.
Check condenser fan for damage or binding.
Relieve binding or replace damaged circulating fan (para. 4-21).
Step 4.
Test fan motor capacitor for continuity leakage and capacitance.
Replace capacitor if damage is indicated (para. 4-25).
COMPRESSOR
1. COMPRESSOR WILL NOT START
Step 1.
Check the selector switch.
a.
Observe position of the switch. Be sure switch is NOT in the OFF or FAN
positions.
Place the switch in the COOL position. If the air conditioner will not operate in
b.
the COOL position, check for a defective switch using a multimeter.
Replace defective switch (para. 4-23).
Step 2.
Check the THERMOSTAT.
a.
Observe position of the THERMOSTAT. Be sure THERMOSTAT is in the
COOLER position.
Rotate THERMOSTAT to the COOLER position. If the compressor will not start,
b.
check for a defective THERMOSTAT using a multimeter.
Replace defective THERMOSTAT (para. 4-29).
Step 3.
Check for loose electrical connections.
Tighten loose electrical connections.
Inspect for defective wiring.
Step 4.
Replace defective wiring. Use identical type wire, consult Appendix F, and solder all
terminal connections (para. 4-29).
Step 5.
Check start relay for continuity.
Replace start relay if continuity is not indicated (para. 4-28).
Step 6.
Check compressor for proper operation and damage (para. 4-30).
Report condition to direct support maintenance personnel.
4-23
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