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TM 9-4110-257-14
5-12.
CHARGING THE REFRIGERANT SYSTEM. - Continued
CAUTION
Never introduce liquid refrigerant into the suction shut off valve. This
can cause damage to the compressor.
(8) Open refrigerant tank, pressure gauge, and charge valves. Allow liquid refrigerant to enter system until tank
weight has decreased by 16 pounds (7.3 kg) or until system pressure has equalized, whichever occurs first.
(9) Close refrigerant tank, charge, and pressure gauge valves.
NOTE
If 16 pounds (7.3 kg) full charge was obtained, skip steps (10) through (15).
(10)
Connect battery if disconnected (para. 4-35).
WARNING
Engines have fast moving parts that can injure hands, fingers, etc. Take
special care while in operation. Engine parts, particularly the exhaust
system, can be very hot and cause severe burns.
(11)
Turn refrigeration unit on (para. 2-5) and operate at desired temperature setting.
(12)
Set refrigerant tank to deliver gas only.
(13)
Check that all service manifold valves are closed.
WARNING
Never introduce high discharge pressure into a refrigerant tank. This
can cause the tank to rupture and injure personnel.
CAUTION
Never introduce liquid refrigerant into the suction shut off valve. This
can cause damage to the compressor.
(14)
Open refrigerant tank, compound gauge, and charge valves.
(15)
Monitor weight of the refrigerant tank until total 16 pounds (7.3 kg) charge is obtained. When system is fully
charged, immediately close refrigerant tank, compound gauge, and charge valves.
(16)
Run refrigeration unit for 15 minutes and observe sight glass through left side condenser door.
(a) Green or chartreuse center means refrigerant moisture content is acceptable.
(b) Yellow center means there is too much moisture in system. Discharge (para. 5-7), replace dehydrator (para.
5-14), leak check (para. 5-10), evacuate (para. 5-11), and charge again.
5-24
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