5-12. CHARGING THE REFRIGERANT SYSTEM. - Continued
(9) Close refrigerant tank, charge, and pressure gauge valves.
If 10 pounds (4.5 kg) full charge was obtained, skip steps (10) through (15).
(10) Connect power at power source.
(11) Turn refrigeration unit on (para 4-7) and operate at desired temperature setting.
(12) Set refrigerant tank to deliver gas only.
(13) Check that all service manifold valves are closed.
Never introduce high discharge pressure into a refrigerant tank This can cause the tank
to rupture and injure personnel.
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) Motor weight of the refrigerant tank until total 10 pounds (4.5 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 door.
(a) Green or chartreuse center means refrigerant moisture content is acceptable.
(b) Yellow center means there is too much moisture m system Discharge (para 5-7), replace dehydrator (para
(17) Be sure all service manifold valves are closed.
b. Partial Charge.
(1) Connect the charge hose to a tank containing refrigerant R-134a set to deliver gas and the vacuum hose to
(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.