AIR CONDITIONING (Cont) - TM-55-1905-223-24-170145

TM 55-1905-223-24-17

Table 3-1. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

AIR CONDITIONING - CONT

NOTE

Purge lines of air before connecting gauge set to service valves.

(4)

Start and run the compressor for 5 minutes before continuing.

NOTE

When system is low on refrigerant, the sight glass next to the

charging valve on the compressor will show a stream of bubbles

or a foamy appearance.

(5)

Open the valve on the container of refrigerant counterclockwise. While watching the sight

glass, slowly crack open the gauge port hand wheel on the combination (suction) gauge

momentarily for 1 or 2 seconds, adding a small amount of refrigerant. Close handwheel

and observe sight glass condition.

(6)

If bubbles are still present, repeat cracking and closing combination with gauge handwheel

until the sight glass shows a clear condition. Do not continue adding refrigerant once the

sight glass has cleared.

(7)

When sight glass has cleared, close valve on refrigerant container.

(8)

Shut down compressor.

(9)

Disconnect manifold hoselines from refrigerant container and charging valve on

compressor. Install protective cap on charging valve.

Compressor crankcase cold (sweating or frosting).

STEP 1.

Check to see if refrigerant is overcharged. Remove excess refrigerant (Malfunction 5).

10.

Compressor will not start.

STEP 1.

Check for low refrigerant charge.

Repair any leaks, evacuate, and recharge system with R-22 as follows:

(1)

Leak test refrigerant line and components:

3-7