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

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