TM 10-5410-228-24
Follow instructions for dedicated R22 refrigerant recovery unit being used to avoid
compressor oil loss. Loss of oil could result in compressor damage.
NOTE
Only use dedicated R22 refrigerant recovery unit.
Manifold gage set valves, when set at mid-position, are used for recovering, evacuating,
charging and testing.
Do not perform step 6 if system has already been evacuated. Replacement pressure tubes,
hoses and air condition components must be purged with nitrogen and evacuated before
charging system.
(10) Turn both manifold high pressure gage valves (3) and low pressure gage valves (4) to mid-
position.
(11) Loosen low pressure gage hoses (7) and high pressure gage hoses (8) at manifold gage sets (1)
slightly for a second to purge air from hoses (7) and (8) and then tighten.
(12) Turn manifold high pressure gage valves (3) and low pressure gage valves (4) clockwise to their
closed (front seated) position.
b. Recovering Refrigerant (Refer to Figure 3-6)
Do not run unit or compressor while servicing.
(1)
Disconnect battery ground cable (TM 9-2320-387-24-1).
(2)
If not already accomplished, install manifold gage sets (1) per para 3.9.1.a.
NOTE
Do not allow R22 refrigerant to escape too quickly. When high pressure and low pressure
gages on manifold gage set read 0 (zero), the discharging procedure is complete.
(3) Turn high pressure gage valves (3) and low pressure gage valves (4) counterclockwise slightly to
permit R22 refrigerant to slowly escape through center hose (13) into recovery unit until gages
read 0 (zero).
(4) Turn high pressure gage valves (3) and low pressure gage valves (4) clockwise to their closed
(front seated) positions.
Figure 3-6. R22 Refrigerant System Servicing (Sheet 2 of 10)
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