a) Check for evaporator coil or filter, clean as necessary
b) Test for over or under charged unit; adjust accordingly.
c) Confirm fan is running at full speed, and check amperage draw.
d) Check for unit running low suction psi, possible dirty evaporator
or filter, clean as needed.
2. Problem related to iced over evaporator coil
a) Check for dirty air filter.
b) Check for dirty evaporator coil.
c) Possible restrictions in the capillary tube or low gas charge;
recheck fan speed.
d) Check thermostat set point. (If room temperature drops below
70°F (21°C), the evaporator may ice over during extended
operation.
NOTE: Mechanical cooling should not operate when outside
temperature is below 60°F (17°C), as the economizer (“free
cooling”) will be in operation.
15
Owner’s Manual
