AIR CONDITIONING (Cont) - TM-55-1905-223-24-170219

TM 55-1905-223-24-17

Table 4-1. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

AIR CONDITIONING - CONT

19.

Partial or insufficient cooling - blower running.

STEP 1.

Check for low refrigerant charge. Find and repair leak. Evacuate, recharge system with R-

22 (Malfunction 10 and paragraph 4-10).

STEP 2.

Check for air in system. Purge (Malfunction 4). If purging is unsuccessful, remove charge,

or evacuate, and recharge with R-22 (paragraph 4-10).

STEP 3.

Check to see if wrong refrigerant is in the system.

Make certain R-22 only was added to the system. If not, purge. If purging is not

successful, remove refrigerant, evacuate, and recharge with R-22 (paragraph 4-10).

Purge non-condensables (A/C-2 only):

(1)

Stop compressor but allow seawater to continue passing through condenser. Allow

compressor to cool for 10 minutes.

WARNING

PRESSURIZED GAS. Open valve slowly to avoid rapid release of refrigerant gas.

Avoid contact with released gas and pressure.

(2)

Crack open the discharge (service) valve on the compressor very slowly (clockwise).

Allow only a small amount of vapor to be released for 2 seconds. Close the

discharge valve fully counterclockwise.

(3)

Start the compressor and check to see if the discharge pressure is still above 230

psig. If so, operate the compressor for 5 minutes and repeat the purging procedure.

Normally, purging 3 or 4 times will remove non-condensables.

4-12