Section VI. HOUSING ASSEMBLY

TM 5-4120-274-15

Probable remedy

Probable Cause

Probable remedy

Probable cause

Check fan for tightness on

Inadequate air across

Clean the air filter (para

Air movement over

shaft. Clean evaporator

evaporator coil

3-9b).

evaporator insuffic.ient

coil (para 3-54c(2)) and

Replace heater element(s)

Burned out heater

filter (para 3-9b).

element (s)

(para 3-39).

Improper electrical connec- Check all heater wiring.

(para 5-22).

tions

3-16. Low Suction and Discharge Pressures

Probable remedy

Probable cause

3-15. Suction Pressure Inadequate

Lack of refrigerant --------Check eight glass for appear-

ance of flash gas (fig.

Low or refrigerant -------- Add refrigerant (para

3-13). Report low refrig-

5-21).

erant charge to direct

Reset thermostat (fig. 2-3).

Air temperature in sir

support maintenance.

conditioned space

Clogged air filter ---------Clean filter (para 3-9b).

excessively low

Section VI. HOUSING ASSEMBLY

c. Installation. Refer to figure 3-4 and 3-5 to

3-17. General

install panels and grilles.

The air conditioner is constructed with removable

aluminum panels. The front access panel provides

3-19. Canvas Condenser Cover

access to the junction box, control panel, and ac-

cess fittings. A discharge panel protects the evap-

a. Removal. Remove retaining hardware and

orator and controls the direction of discharge of

lift off cover. Refer to figure 3-4.

the conditioned air. The intake grille protects the

b. Inspection and repair. Inspect cover for rips

air conditioning filter and regulates the amount

or tears. Repair with water proof tape.

of air returned to the unit. The condenser coil

grille and fan guard protects the condenser coil

c. Installation. Place cover in position and se-

and fan. A fresh air inlet screen permits the entry

cure with retaining hardware.

of outside air and is controlled by the damper

door with the control spring and chain. The cover

3-20. Fresh Air Inlet Screen, Chemical and

panel covers the top of the unit.

Biological Inlet Cover, Condenser Fan

Guard and Condenser Coil Grille

Warning: Disconnect the air conditioner from

the power source before performing any mainte-

a. Removal. Refer to figure 3-4, and remove

nance on the components of the unit.

fresh air inlet screen, CB (chemical and biologi-

cal) inlet cover, condenser fan guard, and con-

3-18. Top Panel, Discharge Grille, Intake

denser coil screen.

Grille, and Front Access Panel

b. Inspection. Inspect for dirt of debris clogging

a. Removal. Refer to figure 3-4 and 35 and

grilles or screens.

remove panels and grilles.

b. Inspection and Repair. Inspect for minor

c. Installation. Install the fresh air inlet screen,

dents and cracked or chipped paint. Repair minor

CB inlet cover, condenser fan guard, and con-

damage, repaint.

denser coil screen (fig. 3-4).

Section VII. GENERAL ORGANIZATIONAL, MAINTENANCE

INSTRUCTIONS

3-21. Compressor (fig. 3-6)

3-22. Evaporator Fan and Inlet Ring

Test for continuity across motor windings with

a. General. The Redmanson model CV-9 series

multimeter set on OHMS. Refer to the wiring

air conditioning units are equipped with a cen-

diagrams figure 1-5 to establish points of con-

trifugal inclined blade evaporator fan. The air foil

tinuity.

fan reduces excessive vibration and noise.

3-9