CHARGING THE REFRIGERANT SYSTEM WITH A FULL CHARGE.

TM 5-4120-364-13

Evacuation of the system when unit has lost complete charge. When the system has

lost its complete charge, it is very important that the system be completely evacuated before recharg-

ing. Proceed as follows:

(1) Attach charging line to suction service valve port. (See figure 4-2).

(2) Backseat the discharge service valve and remove the plug from the port.

(3) Open the suction service valve so both port and compressor are open.

(4) Open the valve on the refrigerant cylinder and build 30 pounds pressure in the

system.

(5) Test for leaks using available leak detector. If leaks are found, close refrigerant

cylinder valve, release system pressure and repair as necessary, then repeat steps (2) through (5). If no

leaks are found, proceed with step (6).

(6) Release pressure in system and replace plug on discharge service valve port.

(7) Using a vacuum pump, pull a 20 to 25 inch (41 to 64cm) vacuum on refrigerant

system, attaching the vacuum pump line to the suction service valve port. Purge with gas from the

refrigerant cylinder and again pull a vacuum.

(8) When a 20 to 25 inch(51 to 64cm) vacuum is reached, backseat the suction

service valve.

(9) Remove the vacuum line.

4-10.

CHARGING THE REFRIGERANT SYSTEM WITH A FULL CHARGE.

After completion of system evacuation in accordance with paragraph 4-9, the unit is

read y for recharging.

Connect the refrigerant charging hookup as shown in figure 4-2 with a full cylinder of

refrigerant R- 12. Weigh the cylinder so that 13 pound 8 ounces can be measured into the system.

NOTE

The refrigerant cylinder used for recharging should be

equipped with a large capacity filter drier. If avail-

able, use recycled refrigerant.

c. Attach charging line to unit. Do not tighten. Be sure refrigerant cylinder is in upright

position so only gas will be drawn off.

Open refrigerant cylinder valve slightly and then close to purge air from the charging

line. Tighten charging line on service valve fitting.

Open valve on refrigerant cylinder about 2 turns.

Change 3 4-9