SECTION V. INTERMEDIATE DIRECT SUPPORT MAINTENANCE PROCEDURES.

TM 55-1905-223-24-17

SECTION V. INTERMEDIATE DIRECT SUPPORT MAINTENANCE PROCEDURES.

There are no separate procedures for equipment for which repair parts are not stocked

MAINTENANCE OF ENVIRONMENTAL CONTROL SUBSYSTEM

3-10.

Removing Charge, Evacuating System, and Recharging. For A/C-1 and 3 (self- contained units),

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

refrigerant:

a. Remove Refrigerant Charge (A/C-1 and 3).

(1)

Shut down the unit.

(2)

Remove front panel of unit for access charging valve on compressor.

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

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

WARNING

Wear protective gloves when connecting hoseline to charging

valve to protect against momentary escape of cold refrigerant.

(5) Remove the protective cap on the charging valve.

NOTE

An adapter from the refrigeration tool kit must be used for

connecting gauge manifold to charging valve on compressor.

(6) Connect the combination (suction) hoseline from gauge manifold to the charging valve on the

compressor. Connect the common (middle) hoseline from the manifold to the valve of an empty R-22

refrigerant container.

(7) Leave the high pressure hoseline plugged.

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.

3-11