Section II. FAN MOTOR REPAIR

(15) Remove wiring harnesses by removing

bristle brush to remove dirt: scale, and other foreign

screws, nuts and gaskets.

matter.

(16) Remove relays by removing screws and

d . Inspection. Inspect all components for cracks.

nuts.

breaks or loose connections.

(17) Remove fuseholders and backing in-

e. Repair or Replacement. Replace all defective

s u l a t i o n by removing screws and nuts from the left

parts. Tighten all loose connections.

end of the junction box.

f. Reassembly. R e a s s e m b l y s h a l l b e i n t h e

(18) Remove terminal boards by removing

r e v e r s e order of disassembly. Make sure all tagged

screws and nuts.

wires are connected to their proper terminals.

c. Cleaning. Clean all parts by using a stiff

S e c t i o n II. FAN MOTOR REPAIR

6-6. Inspection

6-3. General

T h e two speed fan motor may be disassembled and

a. C h e c k t h e b e a r i n g s f o r d i s c o l o r a t i o n , f r a c -

any worn or defective parts replaced in the

tures. wear, pits, etc.

b. C h e c k t h e r o t o r f o r s i g n s o f d r a g g i n g , c h e c k

procedures that follow. The fan motor drives the

its shaft for signs of wear or corrosion.

condenser and evaporator fans.

c. U s i n g a s u i t a b l e o h m m e t e r , m e a s u r e

the

6-4. Disassembly

resistance of the stator windings as follows:

a. Remove the fan motor from the air con-

(1) E to C=40-45 ohms

ditioner (para 4-34).

(2)

C=10-12

ohms

b. R e m o v e t h e r e t a i n e r s c r e w s s e c u r i n g t h e e n d

(3) B to C=18-20 ohms

bell on the motor and remove the end bell.

(4) A to C=1-2 ohms

c. Carefully remove the rotor and shaft assembly

d. I n s p e c t t h e s t a t o r h o u s i n g f o r s i g n s o f

from the stator assembly.

cracking. Check the pole pieces for signs of rotor

d. Remove the bearings from the end bell and

dragging.

from the stator assembly.

e. Check the electrical connector for bent pins,

c. R e m o v e f o u r s c r e w s s e c u r i n g t h e e l e c t r i c a l

corrosion and fractures.

c o n n e c t o r to the stator assembly. Pull the connector

f. A f t e r t h e m o t o r i s r e a s s e m b l e d , c h e c k t h e

o u t as far as the wires will permit it to extend then

m o t o r shaft for freedom to turn. Shaft should turn

u n s o l d e r the wires. Be sure each wire is marked for

freely without any signs of dragging or binding.

later identification.

6-7. Repair or Replacement

f. R e m o v e f o u r s c r e w s s e c u r i n g t h e t e r m i n a l b o x

a. R e p l a c e b e a r i n g s t h a t s h o w d i s c o l o r a t i o n ,

to the stator housing and remove the box.

fractures, wear, pits, etc.

6-5.

Cleaning

b. If rotor shows defects or fractures or its shaft

a. Clean all parts in dry cleaning solvent,

shows wear, replace.

Federal Specification P-S-661. Use a stiff bristle

c. R e p l a c e s t a t o r s w i t h s h o r t e d o r o p e n w i n -

brush to brush away dirt, scale and other foreign

dings. Replace stator assembly if thermal protector

matter.

is defective.

b. Use compressed air to blow out loose material

d. R e p l a c e d a m a g e d e l e c t r i c a l c o n n e c t o r .

in hard to get to areas. Do not spin the bearings

6-8.

Reassembly

with compressed air.

Reassembly

shall

reverse

order of

c. Using a soft cloth carefully wipe all machined

disassembly. Make sure all wires are resoldered to

surfaces with a light oil. Lubricate the bearings

their proper connections.

with grease conforming to MIL-G-25013 if

required. Do not overgrease.

S e c t i o n III. EVAPORATOR AND CONDENSER COIL REPAIR

6-9. General

o u t d o o r air. The lower portion of the condenser coil

serves to cool the liquid refrigerant below its

The evaporator coil extracts heat from the air

saturated condensing temperature. The evaporator

conditioned space by the vaporization of liquid

and condenser coils are essentially non-repairable

refrigerant passing through its tubed path. The

items other than servicing specified in paragraphs

eondenser coil rejects the heat picked up by the

4-66 and 4-67.

evaporator coil and the heat of compression to the

6-2