LEAK TESTING. (Cont) - TM-5-4120-384-140230

TM5-4120-384-14

5-14.

LEAK

TESTING.-Continued

If the soap solution testing method is used,

thoroughly rinse with fresh water after testing is

A residual soap film will attract and

completed.

accumulate an excessive amount of dust and dirt

d u r i n g operation.

Testing Procedures.

To perform leak testing by use of the

electronic detector, it is necessary that the system be pressurized

with a proportion of refrigerant gas.

To perform leak testing by

use of the soap solution method, the system may be pressurized with

dry nitrogen alone.

(1) To pressurize a system

that

has

some

refrigerant

charge,

for

either leak testing method:

(a)

Connect

hoses

from

charging

manifold

charging

valves.

NOTE

If it is possible that the problem may not be a leak

and that you may not have to replace a refrigeration

Refrigerant-22 may be substituted

system component,

for nitrogen in the following test.

If nitrogen is

used you will have to discharge, evacuate, and

recharge the system after test is completed.

(b) Connect a nitrogen pressure regulator and nitrogen

bottle

to center hose connection of charging manifold.

(c)

Open

unit

charging

valves

and

charging

manifold

valves.

(d) Open nitrogen

tank

valve

and

pressurize

system

350

( 2 4 . 7 k g / c m2 ) .

psi

(e)

Perform

leak

tests.

(f) If

a leak is found, discharge and purge system and

See specific instructions for component removal.

repair

leak.

If a leak was not found and Refrigerant-22 was

used

(g)

pressurize

system see charging instructions (para 5-16.).

5-31