TM 9-4120-402-14
5-17. CHARGING THE REFRIGERANT SYSTEM. - continued
CAUTION
Never introduce liquid refrigerant into the low pressure (suction) charging valve. This can cause
damage to the compressor.
(15)
Set refrigerant cylinder to deliver gas only.
WARNING
Never introduce high discharge pressure into a refrigerant cylinder. This can cause the cylinder
to rupture and injure personnel.
(16) Check that pressure gauge valve is closed.
(17) Open compound gauge valve.
(18) Open charge valve.
(19) Monitor weight of the refrigerant drum as air conditioner compressor pulls additional refrigerant gas
into system until full 3.4 pounds (1.5 kg) charge is obtained. When system is fully charged,
immediately close refrigerant drum valve and air conditioner suction service valve.
(20) Run air conditioner in COOL mode (with potentiometer TEMPERATURE control in full COOL
position) for 15 minutes.
(21) With unit
(a)
Green center means refrigerant moisture content is acceptable. running, observe sight glass on
(b)
Yellow center means there is too much moisture in system. It must be discharged, evacuated,
and charged again.
(22) Close compound gauge, charge, and refrigerant cylinder valves.
(23) Turn rotary MODE selector switch to OFF/RESET.
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