Installation Instructions (cont)

TM 5-4120-393-14

d. Prepare Drain Holes. The air conditioner is provided with six drain holes in the base. Remove plugs from all

drains possible for most complete drainage of condensate water. If water from these drains will be objectionable or create

a hazard, external overboard drains can be connected. Use standard 1/2-14 NPT male pipe fittings to connect base

drains. Any type of hose or tubing may be used as a drain line. To ensure proper drainage a drain trap with a minimum

vertical trap height of 2.5 inches (6.4 cm) should be added to all drains. If the installation allows, more than one drain line

can be routed to a common trap. The drain line should lead to an appropriate facility drain, storm sewer, dry sump, or an

acceptable outside area. Be sure the entire length of the drain line is slightly lower than the unit base and sloping away to

ensure gravity drainage.

e. Install Ground. Install a 6 AWG minimum ground wire between the air conditioner cabinet and an adequate

earth ground.

f. Fabricate a power cable. (See para 4-12.)

WARNING

The following test must be conducted with the power on. Use extreme caution.

Death or serious injury may result.

CAUTION

Do not connect P1 connector to air conditioner before making following checks.

g. Connect Power Cable. Connect power cable to a power source of 208 volt, 3 phase, 50/60 hertz.

(1) Apply power to power cable.

(2) Use a multimeter set to AC voltage range of at least 250 volts for following tests.

(3) Measure voltage between pin D of connector P1 and a good chassis ground. Voltage must be zero (0). If

more than zero voltage is observed, disconnect cable and check power source. Correct problem at power source or at

cable connection as indicated.

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