Chapter 5. DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

CHAPTER

DIRECT SUPPORT AND GENERAL SUPPORT

MAINTENANCE INSTRUCTIONS

Section I. REPAIR PARTS, SPECIAL TOOLS, AND EQUIPMENT

5-3. Maintenance Repair Parts

5-1. Tools and Equipment

Repair parts and equipment are listed and

No tools and equipment are issued to direct and

i l l u s t r a t e d in the repair parts and special tools list

general support maintenance for use in main-

covering direct and general support maintenance

tenance of the air conditioner.

for this air conditioner.

5-2. Special Tools and Equipment

No special tools or equipment are required.

Section

II.

TROUBLESHOOTING

5-4. General

the

tests/inspections

and

corrective

actions

the

order listed.

This section contains troubleshooting for locating

a n d correcting most of the operating troubles which

5-5. Malfunctions Not Listed

may develop in the air conditioner. Malfunctions

This manual cannot

list all the malfunctions that

which may occur are listed in table 5-1. Each

may occur nor all

the tests or inspections and

malfunction for an individual component, unit, or

c o r r e c t i v e actions. If

a malfunction is not listed in

s y s t e m is followed by a list of tests or inspections

table 5-1 or is not

corrected by listed corrective

which wilt help you to determine probable causes

actions. notify your

supervisor.

a n d corrective actions to take. You should perform

Table 5-1. Troubleshooting

Corrective Action

Malfunction

Probable Cause

1. Fan Motor runs at low speed only.

a. R e p l a c e f a n s p e e d c o n t r o l p r e s s u r e

a. F a l l s p e e d c o n t r o l p r e s s u r e s w i t c h

switch

(para

5-14).

defective.

2. Compressor

will not

start.

Fan

a. R e p l a c e c o m p r e s s o r ( p a r a 5 - 2 2 ) .

a. D e f e c t i v e c o m p r e s s o r .

b. R e p l a c e h i g h o r l o w p r e s s u r e c u t -

Motor runs correctly.

b. Defective

high

low

pressure

output.

out (para 5-15).

c. R e p l a c e c o m p r e s s o r ( p a r a 5 - 2 2 ) .

c. D e f e c t i v e c o m p r e s s o r t h e r m a l

overload.

d. C h a r g e t h e a i r c o n d i t i o n e r w i t h t h e

d. E x t r e m e l y l o w r e f r i g e r a n t c h a r g e .

correct amount of refrigerant (para

5-8).

3. Comperssor starts but cycles on

a. C h a r g e t h e a i r c o n d i t i o n e r w i t h t h e

a. Excessive

refrigerant

charge.

thermal overload.

Fan motor runs

correct amount of refrigerant (para

correctly.

5-8).

b. A i r o r o t h e r n o n - c o n d e n s i b l e s i n

b. E v a c u a t e s y s t e m a n d r e - c h a r g e

with the correct amount of

refrigeration system.

refrigerant (para 5-8).

c. Compressor

by-pass solenoid valve

c. R e p l a c e d e f e c t i v e b y - p a s s

solenoid

will

not

stop

refrigerant

valve (para 5-17).

flow in cooling mode.

d. Fluid

pressure

regulator

set

too

d. Lower setting of fluid pressure

high or defective.

regulator to not greater than 58

psig. R e p l a c e d e f e c t i v e f l u i d

pressure regulator (para 5-19).

e. D e f e c t i v e

compressor.

e. R e p l a c e c o m p r e s s o r ( p a r a 5 - 2 2 ) .

5-1