AIR CONDITIONING - TM-55-1905-223-24-170144

TM 55-1905-223-24-17

Table 3-1. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

AIR CONDITIONING - CONT

NOTE

A higher than normal suction pressure combined with a

discharge pressure lower than normal indicates a leaky valve

plate.

Replace compressor (paragraph 3-25).

Lower than normal suction pressure.

STEP 1

Check to see if there is sufficient refrigerant.

a. Add R-22 refrigerant as follows:

A/C-1 and 3 are self-contained units.

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.

(1)

Shut down unit and remove front lower cabinet panel for access to charging valve and sight glass

on the compressor. Remove protective cap on charging valve.

(2)

Use a portable gauge manifold for adding refrigerant. Make sure that both handwheels on the

gauge manifold are fully closed clockwise before connecting hoselines.

WARNING

Wear protective gloves when connecting and disconnecting

hoseline to charging valve to protect against momentary release

of refrigerant.

(3)

Connect the combination (suction) hoseline of the gauge to the charging valve on the

compressor. Connect the common (middle) hoseline of the gauge to a container of new R-22

refrigerant. Make sure container is in an upright position.

3-6