Figure 3-1a. Discharging Refrigerant

TM 55-1905-223-24-17

(8) Slowly open the combination gauge handwheel on the manifold. Refrigerant will escape into the

approved recovery/recycling system. See figure 3-1a.

Figure 3-1a. Discharging Refrigerant

(9) Follow instructions per your approved recovery/recycling system.

b. Evacuate System (A/C-1 and 3).

(1) Before evacuating and charging self-contained units, a line piercing valve from the refrigeration tool kit

must be installed in the discharge line from the compressor.

NOTE

The line piercing valve will remain on the discharge line and can

be used in the future for evacuating system and for connecting a

gauge manifold and observing discharge pressure.

(2) Use a refrigeration vacuum pump and portable gauge manifold to evacuate the system.

(3) Make sure both gauge port handwheels on the manifold are closed.

(4) Connect the combination gauge vacuum hoseline from the mainfold to the charging valve on the

compressor. Connect the high pressure gauge hoseline from the manifold to the line piercing valve in

the discharge line from the compressor. Make sure the needle valve of the piercing valve is open

(screwed out three or four turns counterclockwise).

(5) Connect the common (middle) hoseline from the manifold to the suction connection of a vacuum pump.

(6) Make sure all hoseline connections are secure.

(7) Start and run the vacuum pump. Slowly open both gauge port handwheels on the manifold

counterclockwise.

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