AIR CONDITIONER FAILS TO OPERATE. - TM-9-4120-430-140076

TM 9-4120-430-14

0013 00

NOTE

Before using fault procedures, be sure you have performed all applicable operating checks.

FAULT PROCEDURE 1. AIR CONDITIONER FAILS TO OPERATE.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

AIR CONDITIONER FAILS TO OPERATE.

Step 1.

Make sure that you are using the correct voltage and phase.

Check line voltage with multimeter for 208 V ac, three-phase, 50/60 Hz power (S9160-18KH-3

unit) or 230 V ac, single phase, 50/60 Hz (S9150-18KH-1 unit).

NOTE

The J2 connector is the main power input connecter. The J1 connector at the back of

the unit is the ALTERNATE input connector. To use the J1 ALTERNATE

connector, the TB1 connections must be shifted from J2 to J1. Refer to CONNECT

POWER SOURCE procedures in WP 0014 00 and to wiring schematic in WP 0038

Step 2.

Check to see that main power cable is connected to air conditioner and power source.

Connect power cable to receptacle. See WP 0038 00 schematic diagram.

Step 3.

Check to see whether CIRCUIT BREAKER is in the OFF position or is defective.

Reset circuit breaker.

Make continuity check with multimeter. Refer to WP0027 00.

Step 4.

Inspect main power receptacle connections for breaks.

Replace connector. (Refer to WP 0029 00).

Step 5.

Inspect rotary selector switch for incorrect setting. (See Table of Operator Control Settings.)

Turn selector switch to COOL or VENTILATE.

Step 6.

Disconnect control circuit transformer and make continuity check of primary and secondary

windings, and from windings-to-case, using ohmmeter.

If windings do not show continuity or if windings-to-case continuity exists, replace transformer.

FAULT PROCEDURE 2. INSUFFICIENT COOLING.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSUFFICIENT COOLING

Step 1.

Check to see that Mode Selector switch is properly positioned.

Turn selector switch to COOL.

0013 00-2