TM
9-4120-401-14
Table 3-1. OPERATOR TROUBLESHOOTING - continued
MALFUNCTION
TEST OR INSPECTION
C O R R E C T I V E ACTION
3. COMPRESSOR STARTS NORMALLY, BUT HIGH PRESSURE CUTOUT SWITCH SOON
TRIPS.
Step 1. Check to be sure fabric cover is rolled up.
Roll up and secure fabric cover.
Step 2. Check to be sure condenser air inlet and outlet are not obstructed.
Remove obstructions.
Step 3. Reset (PUSH) HIGH PRESSURE CUTOUT switch and restart unit.
If unit does not start, notify supervisor,
Step 4. Check to be sure condenser fan is operating. (Air being discharged from condenser air
outlet.)
If fan is not operating, notify supervisor.
Step 5. With unit operating in COOL mode, check condition of refrigerant in sight glass.
If indicator color is in the yellow zone or numerous bubbles appear in the window, turn
selector switch to OFF/RESET and notify supervisor.
Step 6. Check to be sure that panels are not loose or missing.
Panels must be secure.
REDUCED COOLING CAPACITY.
Step 1. Check that all doors, windows, and other openings in room or enclosure are tightly closed.
Tightly close all openings.
Step 2. Check operation of TEMPERATURE control potentiometer.
Set control at maximum COOL, then, if condition improves, adjust properly.
Step 3. Check that discharge and intake air louvers are properly adjusted. (Must be open.)
Adjust louvers properly.
Step 4. Check that excessive hot, outside air is not being introduced through fresh air damper.
Fully close damper, then, if condition improves, adjust properly.
Step 5. Check that condenser air inlet and outlet are not obstructed.
Remove obstruction.
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