TM 9-4120-411-14
5.9
CHARGING THE REFRIGERANT SYSTEM - CONTINUED.
(4) Check that compound gage and pressure gage valves are closed.
(5) Open vacuum and charge valves.
(6) Open refrigerant tank valve. Operate reclaim unit for 3 to 5 seconds to purge hoses.
(7) Close refrigerant tank, vacuum, and charge valves then stop reclaim unit.
(8) Set refrigerant tank to deliver liquid only.
(9) Place refrigerant tank on an accurate scale to measure and record weight .
CAUTION
Never introduce liquid refrigerant into the suction shut off valve. This can cause
(10) With system shutdown, open refrigerant tank, pressure gage, and charge valves. Allow liquid refrigerant to
enter system until tank weight has decreased by 14 pounds (6.4 kg) or until system pressure has equalized,
whichever occurs first.
(11) Close refrigerant tank, charge, and pressure gage valves.
NOTE
If 14 pounds (6.4 kg) full charge was obtained, skip steps (12) through (16).
(13) Set refrigerant tank to deliver gas only.
(14) 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
(15) Open refrigerant tank, compound gage, and charge valves.
(16) Monitor weight of the refrigerant tank until total 14 pounds (6.4 kg) charge is obtained. When system is fully
charged, immediately close refrigerant tank, compound gage, and charge valves.
5-16