SECTION V. INTERMEDIATE GENERAL SUPPORT MAINTENANCE PROCEDURES

TM 55-1905-223-24-17

SECTION V. INTERMEDIATE GENERAL SUPPORT MAINTENANCE PROCEDURES

MAINTENANCE OF ENVIRONMENTAL CONTROL SUBSYSTEM

4-10. Removing Charge, Evacuating System, and Recharging. For A/C-2, accommodations unit, use the

following procedures to remove refrigerant charge, evacuate, and recharge with R-22 refrigerant:

a. Remove Refrigerant Charge (A/C-2).

(1) Shut down the compressor.

(2) Connect a portable gauge manifold hookup as follows:

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

(4) Remove the protective valve stem caps on the suction and discharge service valves.

(5) Connect the combination (suction) hoseline from gauge manifold to the suction service valve

on the compressor. Connect the high pressure hoseline from gauge manifold to the

discharge service valve on the compressor. Connect the common (middle) hoseline from

gauge manifold to the valve of an empty steel R-22 storage cylinder.

WARNING

PRESSURIZED GAS HAZARD. Handle R-22 refrigerant containers with care to

avoid personal injury. Keep containers away from external heat sources. DO NOT

DROP containers. When in use, place containers where they will not be knocked

over.

(6) Place the empty R-22 container upright in a larger open container (bucket) of cold water.

Add ice as necessary to keep water cold while removing charge.

CAUTION

Either drain condenser completely or keep water flowing through condenser

constantly in order to prevent freeze-up while removing refrigerant.

(7) The system contains 30 lb of R-22 refrigerant. Make sure to obtain enough empty containers

to hold the refrigerant being removed. Make sure to weigh each empty container and record

the weight before removing refrigerant.

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