Grounding

TM 9-4120-425-14&P

UNIT MAINTENANCE

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SERVICE UPON RECEIPT - Continued

INSTALLATION - Continued

Grounding

Clean front of ground connection to obtain a bright metal surface.

Remove insulation from ends of grounding wire (10 AWG) or use bare ends. Make loop at wire ends.

Using 1/4-20 nut and washer, attach one end of wire to air conditioner front panel ground stud.

Wrap a suitable length of perforated strap around clean surface on water pipe or grounding rod.

Using a 1/4-20 screw, two washers and nut, attach other end of grounding wire to strap in a manner such as to

securely tighten strap to pipe or grounding rod, (10 AWG) and wire to strap. If vehicle chassis is used, secure other

end of grounding wire to vehicle chassis using screw, nut, and lockwasher. The screw shall fit in a tapped hole in the

chassis or frame or it shall be held in hole by nut.

WARNING

The vehicle chassis (if used) must be grounded before power is supplied to the unit.

CONNECT POWER SOURCE

CAUTION

Make sure the mode selector switch and circuit breaker are in the OFF position.

CAUTION

For safe operation, be sure a ground wire (at least No. 10 AWG) is connected to the

unit ground connection and a ground source.

Connect a compatible air conditioner power cable to a 208-volt, 50/60 Hz, three phase power source.

If auxiliary power input connector (J1) is used, refer to Schematic Diagram WP 0122-00 and WP 0119-00, Table 1.

OPERATION CHECK AND ADJUSTMENTS

Check operation of unit.

Check for proper power wiring sequence (ABC) which effects compressor direction of rotation. Incorrect wiring

results in noisy compressor operation with little or no cooling. Prolonged operation in reverse direction will damage

compressor.

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