TM 9-4120-402-14
4-5.
INSTALLATION INSTRUCTIONS. - continued
b.
Installation Instructions. Appropriate alterations to the facility to accommodate the selected method of
installation must be completed before actual installation of the air conditioner.
(1)
Attach an overhead hoist through a sling and spreader bar to the lifting handles on each side of the
cabinet.
(2)
Move air conditioner into position and aline mounting holes.
(3)
Secure unit with appropriate mounting hardware.
Base .4375-14 UNC (4 holes)
Rear.3125-24 UNF (3 holes)
(4)
Seal all openings around cutouts for air conditioner, air and water tight. Use gasket, caulking, or other
suitable material.
(5)
The air conditioner is provided with four drain holes in base. (See figure 4-1.) 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. 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 at the same
height, or lower than the base to ensure gravity drainage.
(6)
Install a 10 AWG minimum ground wire between air conditioner cabinet and an adequate earth ground
using ground stud on back of unit.
(7)
WARNING
The following test must be conducted with the power on. To avoid injury, exercise extreme
caution.
CAUTION
Do not connect P4 connector to air conditioner before making following checks or unit may be
damaged.
(8)
Connect power cable to a 208 volt, 3 phase, 50/60/400 hertz power source.
(a)
Apply power to power cable.
(b)
Use a multimeter set to AC voltage range of at least 250 volts for following tests.
(c)
Measure voltage between pin D of connector P4 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.
(d)
With zero voltage on pin D or P4 connector, check voltages between remaining pins as shown
4-18