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TM 9-4110-257-14
5-12.
CHARGING THE REFRIGERANT SYSTEM. - Continued
(2) Check that compound gauge and pressure gauge valves are closed.
(3) Open vacuum and charge valves.
(4) Open refrigerant tank valve. Operate reclaim unit for 3 to 5 seconds to purge hoses.
(5) Close refrigerant tank, vacuum, and charge valves then stop reclaim unit.
(6) Connect power at power source.
(7) Turn refrigeration unit on (para. 2-5) and operate at desired temperature setting.
(8) Set refrigerant tank to deliver gas only.
(9) 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.
(10)
Open refrigerant tank, compound gauge, and charge valves.
(11)
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.
(c) Milky white or bubbly liquid means system has low charge.
(d) Clean bubble free liquid around center means the system is fully charged.
CAUTION
Never introduce liquid refrigerant into the low pressure (suction)
charging valve. This can cause damage to the compressor.
(12)
If charge is low, set refrigerant tank to deliver gas only.
5-26
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