SERVICE - TM-5-4120-374-130120

TM 5-4120-374-13

5-7. REFRIGERANT SERVICING (CONT)

REMARKS

ACTION

LOCATION/lTEM

TOP OF HOUSING

7. Soldering

a. Solder all copper-to-copper joints with silver solder type 3, 4 or

6A per specification QQ-S-561.

Procedure

b. Solder all copper-to-brass or copper-to-steel with type 4 or 6A

per specification QQ-S-561.

c. Solder melting point is 1160 F (625 0C).

d. Make all solder joints with an atmosphere of inert gas to present

internal oxidation.

Avoid bodily contact with liquid refrigerant and avoid inhaling refrigerant gas. Be especially

careful that Refrigerant 12 does not come in contact with eyes. In case of refrigerant leaks,

ventilate area immediately.

8. Charging a Completely

Evacuated System

Always charge the air conditioning system with Refrigerant 12 vapor. NEVER introduce

LIQUID refrigerant into the service valves.

NOTE

Whenever available, use recycled refrigerant for charging the refrigeration system.

Place refrigerant drum on a scale in an upright position. Monitor

weight until three pounds of R12 refrigerant have entered the

system.

Remove valve cap from suction service valve.

Loosely connect charging line to suction service valve.

Partially open refrigerant drum valve and purge air from charging

line.

Close refrigerant drum valve and tighten connection at suction

service valve.

With air conditioner operating in the cooling mode, open suction

service valve and refrigerant drum valve, and add approximately

one (1) ounce of refrigerant per minute. Constantly observe sight

glass and when bubbles disappear, close suction service valve.

Close refrigerant drum valve.

Carefully loosen charging line to release trapped pressure.

Disconnect charging line and install valve cap on suction service

valve.

Check sight glass for gas bubbles. If gas bubbles are present, add

additional refrigerant.

9. Low Charged

In the event the air conditioner requires additional refrigerant,

System

perform steps b through j above.

Change 2

5-8