Recharge System (A/C-1 and 3).

TM 55-1905-223-24-17

(4) Crack the valve on the container momentarily and then close. Loosen the common hoseline

connection at the manifold to purge the hose, then resecure the connection.

WARNING

Do not use water warmer than 110 to avoid over-expansion of

refrigerant in container.

(5) Place the refrigerant container upright in a container of warm water that is no warmer than 110 . This

will maintain container pressure and expedite charging.

WARNING

DO NOT apply heat with a torch.

(6) Start the compressor. Slowly open the low side handwheel on the combination gauge. DO NOT open

the high side handwheel. Charging must be accomplished through the charging valve on the suction

line.

(7) Observe both gauges on the manifold while charging. Also observe the sight glass located next to the

charging valve on the compressor.

(8) When operating pressures are within proper range (suction: 55 to 72 psig, discharge: 190 to 275 psig),

close the low side handwheel on the manifold. Check the sight glass. If bubbles, or a stream of

bubbles, are observed, crack the handwheel and add more refrigerant until sight glass clears. DO NOT

continue adding after sight glass has cleared. Stop the compressor.

(9) Again weigh the refrigerant container to determine if system has been overcharged. Deduct the weight

of the container from the initial weight obtained before charging. The result is the weight actually

added to the unit.

(10) If the result is in excess of the amount required by the unit's dataplate, release a small amount of

refrigerant. Close the valve on the container, make sure the handwheel on the combination gauge is

closed, and disconnect the common hoseline from the container. Release a small amount of

refrigerant by momentarily cracking the handwheel on the combination gauge. Take care not to

release too much, or refrigerant may have to be added back.

(11) Start the compressor, allow to run for 5 minutes, and again check operating pressures and sight glass.

(12) When charging is complete, allow to run for 5 minutes, and again check operating pressures and sight

glass.

(13) Disconnect the portable gauge manifold and install protective caps on charging valve and piercing

valve.

Change 2 3-14