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Chapter 3. OPERATOR'S MAINTENANCE INSTRUCTIONS - TM-5-4120-347-140035
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TM-5-4120-347-14 Air Conditioner Horizontal Compact 9 000 BTU/HR 208 Volt 3 Phase 60 Hertz Manual
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Chapter 4. ORGANIZATIONAL MAINTENANCE INSTRUCTIONS - TM-5-4120-347-140037
TM5-4120-347-14
TABLE 3-1. -- OPERATOR TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. AIR CONDITIONER DOES NOT START IN ANY MODE.
Step 1.  Check to see if input power has been disconnected.
Connect input power.
During cool weather do not start in COOL mode for four hours.
Step 2. Check to see if control or compressor circuit breaker is tripped.
Reset circuit breaker(s).
2. REDUCED COOLING CAPACITY.
Step 1.
Check to be sure the MODE SELECTOR switch is turned to COOL.
Turn switch to COOL.
Step 2. Check operation of TEMPERATURE SELECTOR.
Set control at maximum COOLER, then, if condition improves, adjust properly.
Step 3. Check that the supply and return air louvers are properly adjusted.
Adjust louvers properly.
Step 4. Check to be sure that excessive hot, outside air is not being introduced through the fresh air
damper.
Fully close damper, then, if condition improves, adjust properly.
Step 5. Check that all doors, windows, and other openings in the room or enclosure are tightly closed.
Tightly close all openings.
Step 6. Check to see if EVAPORATOR FAN SPEED switch is set at LOW speed.
Set switch to HIGH speed.
Step 7. Check to be sure condenser air inlet guard or discharge air louver are not obstructed.
Remove obstruction.
Step 8. Check condition of refrigerant in sight glass.
If refrigerant color is in the yellow zone or numerous bubbles appear in window, turn selector
to OFF and contact direct support maintenance.
3. REDUCED HEATING CAPACITY.
Step 1. See that the MODE SELECTOR switch is properly set.
Set switch on LOW or HIGH HEAT.
Step 2. Check operation of TEMPERATURE SELECTOR switch.
Set control to fully WARMER then, if condition improves, adjust properly.
Step 3. Check that the supply and return air louvers are properly adjusted,
Adjust louvers to open position.
Step 4. Check to be sure that excessive cold, outside air is not being introduced through the fresh air
damper.
Fully close damper, then, if condition improves, adjust properly.
Step 5. Check that all doors, windows, and other openings in the room or enclosure are tightly closed.
Tightly close all openings.
3-2

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