Page 12
STEP 4 – ELECTRICAL – (Continued) – High Voltage and Field Control Wiring
The following illustration provides an example of control wiring connections when using a standard thermostat.
Any excess high voltage field wiring should be
trimmed and secured away from any low voltage field
wiring. To facilitate a conduit, a cutout is located in the
bottom of the control panel. Connect conduit to the
control panel using a proper conduit fitting.
NOTE - Wire tie provides low voltage control wire strain
relief and maintains separation of field-installed low and
high voltage circuits.
NOTE - For proper voltages, select thermostat wire
(control wires) gauge per table above
.
NOTE - Do not bundle any excess 24VAC control
wires inside control panel.
Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit as illustrated.
A -
Run 24VAC control wires through hole with grommet
and secure with provided wire tie.
B -
Make 24VAC thermostat wire connections. Locate
the two wires from the contactor and make
connection using field-provided wire nuts:
● Yellow to Y1
● Black to C (common)
ROUTING HIGH VOLTAGE, GROUND AND CONTROL WIRING
WIRE RUN LENGTH
AWG# INSULATION TYPE
LESS THAN 100' (30 METERS)
18 TEMPERATURE RATING
MORE THAN 100' (30 METERS) 16 35ºC MINIMUM.
HIGH VOLTAGE / GROUND WIRES
FIELD CONTROL WIRING
W1
Y
G
C
R
Y
G
C
THERMOSTAT
INDOOR UNIT
POWER
HEAT
COOLING
INDOOR BLOWER
COMMON
OUTDOOR UNIT
Y1
C
W
R
YELLOW
BLACK
FIGURE 12
NOTE - Refer to furnace, blower coil and accessory instructions for
additional wiring configurations with other optional controls.
4AC14
24VAC Control Wiring Diagrams (Field Installed)
4AC14
4AC14
4AC14
4AC14
4AC14
4AC14
ML180
EL280, EL295, EL296
SLP98, SL28UH, SL280DF
CBX25
CBX40UHV
BROWN
BLUE
RED
1
2
3
1
2
3
Air handler shipped with jumpers installed between W1 and W2
and W2 and W3.
R connection required for air conditioner with LSOM. Resistor kit
(CAT #47W97) required when connection ComfortSense 7000
with LSOM 2.
L connection wired on units with LSOM.
FIGURE 13
