CONDITIONED AIR (EVAPORATOR) FAN STARTS IN COOL MODE, BUT <a href="http://firecontrolman.tpub.com/14104/css/Condenser-184.htm">CONDENSER</a> FAN DOES NOT START AND COMPRESSOR DOES NOT START AFTER TIME DELAY.

TM 5-4120-393-14

Table 4-2. Unit Maintenance Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. CONDITIONED AIR (EVAPORATOR) FAN STARTS IN COOL MODE, BUT CONDENSER FAN DOES NOT START

AND COMPRESSOR DOES NOT START AFTER TIME DELAY.

NOTE

If power has been connected to unit, a short (30 minute maximum during very cold

weather) warm up period is required. When compressor reaches a safe operating

temperature, it will come on automatically if mode selector switch is in the COOL

mode.

Step 1. Check to see if high or low pressure cutout switch (S5 and S6) is tripped.

Push then release reset buttons.

WARNING

Disconnect input power before performing internal electrical troubleshooting.

Voltages

used can be deadly.

Step 2. Check for loose or damaged electrical connectors, or damaged wires in harness.

Tighten or replace connections, or repair damaged wires.

Step 3. Check operation of high and low pressure cutout switches (S5 and S6).

Test switch. (See para 5-27.) Replace switch(es) if defective.

Step 4. Check operation of compressor motor thermal overload, overcurrent protector.

Test protector. Contact Intermediate Direct Support Maintenance for compressor

replacement if protector is open.

Step 5. Check operation of mode selector switch (S).

Test switch. (See para 4-38.) Replace switch if defective.

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