AIR CONDITIONING (Cont) - TM-55-1905-223-24-170146

TM 55-1905-223-24-17

Table 3-1. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

AIR CONDITIONING - CONT

WARNING

Turn electrical power OFF.

(2)

With the unit shutdown, use the refrigerant gas leak detector in the refrigeration tool kit and

check all lines and components in the system for leaks.

NOTE

Leaks commonly occur in defective joints, fittings, gaskets, and in

breaks caused by vibration.

A portable gauge manifold must be hooked up on self- contained air

conditioners (A/C-1 and 3) to determine pressure.

(3)

If refrigerant has been lost due to a leak and pressure is below 175 psig, add enough R-22

refrigerant to system so that pressure is increased to 175 psig before checking for leaks

(Malfunction 8).

(4)

Locate leak and correct as required.

NOTE

Self-contained air conditioners (A/C-1 and 3) cannot be pumped down. The refrigerant

charge must be completely removed before opening the system for maintenance purge,

and recharged with new refrigerant before returning to normal operation (paragraph 3-10).

(5)

Remove the refrigerant charge as required by corrective action (Malfunction 5).

(6)

After corrective action is complete, add R-22 refrigerant (Malfunction 8) or evacuate and

recharge system (paragraph 3-10) as appropriate.

STEP 2. Check for defective transformer (A/C-1 and 3). Replace transformer (paragraph 3-25).

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