292426-YIM-A-0307
Unitary Products Group
13
POWER AND CONTROL WIRING
Install electrical wiring in accordance with the latest National
Electrical Code (NFPA Standard No. 70 and/or local regula-
tions). The unit must be grounded in accordance with these
codes.
POWER WIRING
Remove the knockout from the units rear panel (7/8" for
KEU060 and KEU180, 1-3/8" for KEU090, and 120) for power
wiring conduit through this opening. Connect the conduit to
the required field-supplied fitting and the power wiring to
blower motor contactor 10M in unit control box.
If the unit includes an electric heat accessory, route the
power wires into heater control box in lieu of the unit. Refer
to electric heat instruction 131002 for additional installation
information.
CONTROL WIRING
Route the low voltage control wiring through the 7/8" hole
(with bushing) in the units rear panel. Add a 1/2" conduit fit-
ting to the 7/8" hole in the unit control box, route control wiring
through this opening and connect them to the terminals on
block 4TB.
Blower unit Model KEU060 contains a low voltage control
transformer (1T), which supplies the 24-volt control voltage
for its operation and for the operation of the condensing unit.
CONTROL WIRE SIZING
To determine the total circuit length, add the follow-
ing distances:
1 - Outdoor Unit to Indoor Unit
_____________
2 - Indoor Unit to Thermostat
_____________
3 - Thermostat to Indoor Unit
_____________
4 - Indoor Unit to Outdoor Unit
_____________
5 - Outdoor Unit to Elec. Heater _____________
Total Circuit Length _____________
Refer to Figures 16, 17 & 18 for location of power and control
wiring openings in rear panel of the units. Refer to Figure 11
for typical field wiring. Refer to Table 7 to size the disconnect
switch, the power wiring and the fuses.
NOTE:
Three phase motor rotations may be incorrect when
unit is first started. Reverse phase (leads L1 and L2)
at blower motor contactor to obtain correct rotation.
To prevent possible interconnection between 24-volt
circuits, the condensing unit being used with Model
KEU060 blower unit must NOT contain its own 24-
volt power supply.
Wire Size
Maximum Total Circuit
Length (Feet)
#19 Solid
#18 Solid
#18 Stranded
#16 Stranded
#14 Stranded
#12 Stranded
130
170
180
270
455
730
