TM 9-4120-407-14
Figure 4-10. Refrigerant Charging (Total System)
Never introduce liquid refrigerant into the low pressure (suction)
charging valve. This can cause damage to the compressor.
(7) Close compound gauge valve.
(8) Set refrigerant cylinder to deliver liquid only.
(9) Place refrigerant cylinder on an accurate scale to measure and record weight.
(10) Open discharge and suction valves.
(11) Open charge valve. Allow liquid refrigerant to enter system until drum weight has decreased
by 6.2 pounds (2.8 kg) or until system pressure has equalized.
4-43