TB-9-2320-279-13-1

TECHNICAL BULLETIN; AIR CONDITIONING SYSTEM

OPERATOR’S, UNIT AND DIRECT SUPPORT MAINTENANCE MANUAL, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LISTS

DECEMBER 2005

TB-9-2320-279-13-1 - Page 199 of 524

TB 9-2320-279-13-1

0015-31

AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

DRAFT

WARNING

Wear protective goggles and nonleather gloves when servicing air conditioner system.

Failure to

comply may result in injury to personnel.

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HEMAC188

PRESSURE TEST

(1)

Connect AC test set recovery/recycling manifold

gages to AC service valves (WP 0050).

Ensure

test set valves are closed.

(2)

Inspect AC test set recovery/recycling manifold

low-side gage reading.

(a) If gage reading does not indicate at least 30

psi pressure:

1.

Inspect system for damage.

Repair any

damage found.

2.

Inspect system for loose fittings.

Tighten

fittings as required.

3.

Perform leak test (WP 0049).

Add R-134a

refrigerant if required to perform test

(WP 0050).

4.

Recover R-134a refrigerant (WP 0050).

5.

Repair leaks found.

6.

Replace AC condenser dryer (WP 0025).

7.

Evacuate and charge system with new

R-134a refrigerant (WP 0050).

8.

Verify repair, go to Step 22 of this fault.

(b) If gage reading indicates at least 30 psi

pressure, replace low pressure switch

(WP 0041).

Verify repair, go to Step 22 of this

fault.