Refrigerant System

TM 5-4120-356-14

to the seats of flare nut fittings.

( d ) Apply leak lock (NSN 4030-00-999-6313) to the t h r e a d s of threa-

ded fittings.

(e) Install the fittings and associated component and tighten fitt-

ings.

(4) Repressurize the system with vaporized refrigerant to get 100 psig

( 7 . 0 k s / m c ) on both sides (suction and discharge) of the compressor.

( 5 ) Using available leak detector, verify that the repaired area is no

longer leaking. Repeat steps (1) through (5) if the repaired area is still leaking.

e . I f r e f r i g e r a n t l e a k d e t e c t i o n a n d r e p a i r p r o c e d u r e s have been performed

as a result of the replacemento f r e f r i g e r a n t c o m p o n e n t o r c o m p o n e n t s , refer to, and

c o m p l e t e applicable installation procedures f o r t h e r e p l a c e d c o m p o n e n t o r c o m p o n e n t s .

f . I f r e f r i g e r a n t l e a k d e t e c t i o n a n d r e p a i r p r o c e d u r e s h a v e not been perform-

e d as a result of the replacement of refrigerant components, proceed as follows:

( 1 ) Release refrigerant from the system in accordance with paragraph 4-6.

( 2 ) Purge the refrigerant system in accordance with paragraph 4-8.

( 3 ) Evacuate the refrigerant system in accordance with paragraph 4-9.

( 4 ) C h a r g e t h e s y s t e m w i t h r e f r i g e r a n t i n a c c o r d a n c e with paragraph 4-10.

4-5.

Nearly all operations for the correction of malfunctions found in troubleshooting or

m a i n t e n a n c e activities of Direct Support Maintenance require that the refrigerant

system be opened. R e f e r to paragraphs 4-6 through 4-10 for procedures u s e d in open-

i n g and closing the refrigerant system.

S e e figure 4-1 for a flow diagram of the

r e f r i g e r a n t system.

O p e n i n g the refrigerant system for the replacement of components or other maintenace

a c t i v i t i e s requires the release of refrigerant from the system. Refer to figure 4-2

when releasing refrigerant.

4-7.

The dehydrator (drier) prevents the accumulation of moisture and contaminates within

t h e refrigerant system. T h e dehydrator must be replaced each time the system is ex-

posed to the atmosphere. R e l e a s e refrigerant in accordance with paragraph 4-6 be

f o r e removing the dehydrator from the system. Refer to figure 4-16 for replacement

o f the dehydrator.

The refrigerant system must be purged each time the system is exposed to the atmosphere.

4-9