TM 9-4110-255-14
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
(10) Open refrigerant tank, compound gage, and charge valves.
(11) Run refrigeration unit for 15 minutes and observe sight glass through left side 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 5-10), replace
dehydrator (para 5-17), leak check (para 5-13), evacuate (para 5-14), 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.
WARNING
Never introduce high discharge pressure into a refrigerant cylinder. This can cause the cylinder to
rupture and injure personnel.
(13) Check that pressure gage valve is closed.
(14) Open refrigerant tank, compound gage, and charge valves.
(15) Charge until sight glass remains clear and bubble free for 15 minutes.
(16) When system is fully charged, immediately close refrigerant tank, compound gage, and charge valves.
(17) Shut off refrigeration unit (para 2-7).
NOTE
FOLLOW-ON MAINTENANCE:
Remove service manifold (para 5-9).
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