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TM5-4120-376-14
e. Check operation and top of refrigerant as necessary, in the following manner:
(1) With power connected to the air conditioner, turn the mode selector switch to COOL
and the temperature selector to the maximum COOLER position. Let the air conditioner
operate for 15 minutes in this mode, then observe the sight indicator while the air conditioner is
running. If bubbles or milkiness appears, top off the refrigerant charge as follows:
(2) With the air conditioner compressor operating, open the suction service valve and the
cylinder shutoff valve to charge refrigerant gas. Continue to observe the sight indicator until
sight indicator is clear of bubbles. Freon may be heated by placing the cylinder in a container
of warm water to ease charging procedure.
(3) When the liquid in the sight indicator is clear of bubbles, add additonal 6-8 ounces
(168-264 g) of refrigerant. Close the suction service valve and the cylinder shutoff valve.
(4) Disconnect the manifold gauge assembly and the refrigerant cylinder pressure-test the
air conditioner in accordance with paragraph 5-14, page 5-18.
5-17
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