Servicing the Refrigerant System - TM-5-4120-222-140064

Figure 5-15. Hot gas bypass solenoid valve, and high pressure cutout switch,

removal and installation.

5-33. Servicing the Refrigerant System

torch, Mark all spots where leaks are noticed.

Drain the refrigerant system and repair the leak,

a. Testing Refrigerant System for Leaks.

and pressure test.

(1) Electronic or halide torch leak detector.

Warning: Avoid bodily contact with

The preferred method of testing for leaks in the

liquid refrigerant and avoid inhaling refrigerant

refrigerant system is by using a halide torch. A

gas. Be especially careful that refrigerant

halide detector is used by passing the exploring

-22 does not come in contact with the eyes. In

tube over sweat fittings, all mechanical couplings,

case of refrigerant leaks, ventilate the area im-

and valves. If refrigerant is leaking from the

mediately.

system, the flame of the halide torch will change

(2) Soap solution method. Operate the air

from blue to green when the leak is small. If the

conditioner, brush all possible points of leakage

leak is large, the flame will be dense blue with a

with soap solution, and watch for bubbles. Follow

reddish tip; or, a large leak may extinguish the

a definite sequence so all points will be thoroughly

AGO 20053A