Figure 6-2. Charging refrigerant system (Sheet 2 of 2).

TM 5-4120-352-14

STEP 3.

SET THE REFRIGERANT DRUM IN AN INVERTED POSITION ON A SCALE.

DO NOT OPERATE THE AIR CONDITIONER.

OPEN CHARGING LINE VALVE AND CHARGING VALVE AND

CHARGE REFRIGERANT SYSTEM UNTIL SYSTEM AND DRUM PRESSURES

HAVE EQUALIZED, OR UNTIL 2.1 POUND OF REFRIGERANT HAVE

ENTERED THE SYSTEM.

STEP 4.

CLOSE VALVES AND CAREFULLY LOOSEN THE CHARGING LINE TO

RELEASE TRAPPED PRESSURE.

DISCONNECT CHARGING LINE AND INSTALL CHARGING VALVE CAP.

OPERATE AIR CONDITIONER IN COOLING MODE FOR 15 MINUTES.

IF SYSTEM IS SHORT OF

STEP 5. CHECK LIQUID SIGHT INDICATOR.

REFRIGERANT, GAS BUBBLES WILL APPEAR REGULARLY IN THE

IF REFRIGERANT SYSTEM IS UNDERCHARGED, ADD

INDICATOR.

ADDITIONAL REFRIGERANT, FOLLOWING STEPS 6 THROUGH 9.

STEP 6.

USING SAME DRUM AND CHARGING LINE, PLACE DRUM IN AN

UPRIGHT POSITION ON A SCALE. REMOVE CAP FROM LOW PRESSURE

(SUCTION SIDE) CHARGING VALVE , AND LOOSELY CONNECT

PURGE AIR FROM LINE AS IN STEP 2.

CHARGING LINE TO VALVE.

CAUTION: WHEN ADDING REFRIGERANT, USE EXTREME CARE TO AVOID

ADDING REFRIGERANT TO THE SYSTEM TOO FAST, WHICH WOULD CAUSE

SLUGGING AT THE COMPRESSOR.

STEP 7.

WITH THE AIR CONDITIONER OPERATING, ADMIT GAS TO SYSTEM

SLOWLY (APPROXIMATELY 1 OUNCE PER MINUTE).

CONSTANTLY OBSERVE DRUM WEIGHT TO INSURE THAT ONLY

2.1 POUNDS TOTAL WEIGHT OF REFRIGERANT IS IN SYSTEM.

STEP 8.

REPEAT STEP 4.

STEP 9.

CHECK LIQUID SIGHT INDICATOR. IF INDICATOR REGULARLY SHOWS

BUBBLES, REPEAT STEPS 6 THROUGH 9, ADDING REFRIGERANT IN

4 OUNCE INCREMENTS UNTIL INDICATOR Is CLEAR.

STEP 10. REPLACE ACCESS COVER.

T S 4120-352-14/6-2(2)

Charging refrigerant system (Sheet 2 of 2).

Figure 6-2.

6-5