Table 4-3. Unit Troubleshooting.
TEST OR INSPECTION
W i t h unit operating in COOL mode, check the condition of
refrigerant in sight glass.
If color is yellow or a light hue of chartreuse, or if numerous
bubbles appear, turn air conditioner OFF. Contact your supervisor.
Check that all doors, windows and other openings in the room or
enclosure are tightly closed.
Tightly close all openings.
If control panel is remotely located, check to be sure that sensing
bulb is not near a light bulb or some type of heat producing
Turn off or move heat source, or move the remote control panel per
Check that the evaporator inlet and outlet louvers are properly
Adjust louvers properly.
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.
If air flow volume is low:
a. Adjust intake (return air) guard louvers.
b. Clean and service or replace conditioned air filter element.
c. Clean evaporator coil.