506694-01
Issue 1720
Page 14 of 16
Electrical
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the
current Canadian Electrical Code (CEC).
Refer to the furnace or air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
24VAC Transformer
Use the transformer provided with the furnace or air handler
for low-voltage control power (24VAC - 40 VA minimum).
SERVICE
DISCONNECT
SWITCH
MAIN FUSE BOX/
BREAKER PANEL
Refer to the unit nameplate for minimum circuit ampacity, and maximum
fuse or circuit breaker (HACR per NEC). Install power wiring and properly
sized disconnect switch.
NOTE — Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
SIZE CIRCUIT AND INSTALL DISCONNECT SWITCH
NOTE — 24VAC, Class II circuit connections are made in the control
panel.
Ensure that existing room thermostat is installed on an inside wall
approximately in the center of the conditioned area and 5 feet (1.5m) from
the floor. It should not be installed on an outside wall or where it can be
affected by sunlight or drafts.
THERMOSTAT
5 FEET
(1.5M)
CHECK EXISTING ROOM 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.
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
WIRE RUN LENGTH
AWG# INSULATION TYPE
LESS THAN 100' (30 METERS)
18 TEMPERATURE RATING
MORE THAN 100' (30 METERS) 16 35ºC MINIMUM.
Use existing or replace low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated.
HIGH VOLTAGE / GROUND WIRES
CONTROL WIRING
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:
Black to Y1
Black to C (common)
NOTE — For proper voltages, select thermostat wire (control wires)
gauge per table below
.
NOTE — Wire tie provides low voltage control wire
strain relief and to maintain separation of field
installed low and high voltage circuits.
W1
Y
G
C
R
Y
G
C
THERMOSTAT
INDOOR UNIT
POWER
HEAT
COOLING
INDOOR
BLOWER
COMMON
OUTDOOR
UNIT
Y1
C
W
R
TYPICAL LOW VOLTAGE CONTROL
WIRING
SINGLE PHASE
NOTE — Do not bundle any excess 24VAC control wires inside
control panel.
CONTROL
WIRING
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
GROUND
GROMMET AND
WIRE TIE
HIGH VOLTAGE
FLEXIBLE CONDUIT
A
B
BLACK
BLACK
