Section V. OPERATOR'S MAINTENANCE

Corrective Action

Probable Cause

Malfunction

If cycling is excessive, shut off cooling

Outdoor air temperature fluctuating

9. Compressor cycles constantly.

operation and operate to obtain

near the 50F, setting of the

maximum cooling through use of

outside air temperature.

the ventilation mode (para 2-11).

Remove obstruction to evaporator

Restricted air flow to the evaporator

10. Low pressure cutout trips ex-

air m o v e m e n t . I n s u r e t h a t

coil.

cessively.

evaporator intake and discharge air

grilles are open (para 2-11).

Close circuit breaker contacts (para

Circuit breaker contacts open.

1 1 . No heat, fan motor running

2-9).

properly.

Raise setting of temperature control

Temperature control thermostat eat

12. Low heat only. Fan motor

thermostat (para 2-11).

too low.

running properly.

a. Remove obstructions to evaporator

a. Restricted air flow to evaporator

13. Insufficient heating, Fan motor

air m o v e m e n t . I n s u r e t h a t

coil.

running properly.

evaporator intake and discharge air

grilles are open (para 2-11).

b. Insure that the outdoor air

b. Excessive amount of cold outdoor

is closed to provide the minimum

air being introduced.

introduction of outdoor air for

ventilation (para 2-11).

c. R a i s e s e t t i n g o f t e m p e r a t u r e

control

thermostat

c. Temperature

set too low.

control thermostat (para 2-11).

Section V. OPERATOR'S MAINTENANCE

compressed air in the reverse of normal air flow.

3-7. General

Replace the screen i f d a m a g e d .

The instructions in this section are published for

c . I n s t a l l a t i o n . Install the fresh air inlet screen

the information and guidance of the operator in

in reverse order of removal.

maintaining the air conditioner.

WARNING

3-9. Condenser Coil Guard Service

Disconnect the air conditioner from the

a. Removal. Remove the condenser coil guard

power source before performing any

assembly from the rear of the air conditioner by

maintenance on the components of the

removing 8 screws.

air conditioner.

b. Servicing. Wash the guard to remove ac-

cumulated dirt and other obstructions to air flow.

3-8. Fresh Air Inlet Screen Servicing

Replace damaged guard.

a. Removal. Remove the fresh air inlet screen

c. Installation. Reinstall the condenser coil

f r o m the rear of the air conditioner by removing 5

guard in the reverse order of removal.

screws.

b. Servicing. Clean the screen by blowing with

3-4