Page 12 of 19
507523-01
Issue 1946
Electrical Connections
Electrical Shock Hazard!
Turn OFF electric power before connecting
unit, performing any maintenance or
removing panels or doors. More than one
disconnect may be required to turn off all
power.
FAILURE TO DO SO COULD RESULT IN
BODILY INJURY OR DEATH.
WARNING
Electric Hazard/High Voltage
Wait 5 minutes after disconnecting power components
may hold electric charge.
WARNING
Be sure to check all local codes to determine that the unit
is installed in accordance with local requirements. Consult
the National Electric Code for wire size requirements. Use
60° C or higher copper wires only. Always provide ground
connections to the outdoor unit. Power supply must agree
with the rating on the unit nameplate.
Provide line voltage power supply to unit from a properly
sized disconnect switch. Route power and ground wires
from disconnect switch to unit. Line voltage connections
are made at the line side of the contactor in the control box
of the outdoor unit. Follow the wiring diagram attached to
inside of the access panel.
Proper circuit protection recommendations are indicated
on Unit Rating Plate. Time delay fuses are required to
prevent blowing due to starting current (the current in rush
when equipment starts is referred to as the Locked Rotor
Amps or LRA).
Remove access panel to gain access to unit wiring. Extend
wires from disconnect through power wiring hole provided
and into unit control box. Flexible conduit is required for the
swing out control box feature.
The unit cabinet must have an uninterrupted or unbroken
ground. The ground must be installed in accordance
with all electrical codes. Failure to follow this warning
can result in an injury, fire, or death.
WARNING
Connect ground wire to ground connection in control box
for safety. Connect power wiring to contactor.
Ensure the room thermostat is properly installed per
instructions shipped with room thermostat. Generally the
thermostat should not be exposed to sunlight, drafts or
vibration and should not be mounted on exterior walls.
Low voltage wiring must be separated from high voltage
wiring.
WARNING
Low voltage connections should be in accordance to the
wiring diagram.
Alarms
Alarm information is provided on the outdoor unit access
panel and in the Comfort Sync Wi-Fi
®
Installer’s System
setup Guide.
Outdoor Control Seven-Segment Display and
Push Button
Information concerning the outdoor control seven-segment
display and push button operations are available on the
unit access panel.
System Component Configuration (Outdoor Unit)
All configuration of the outdoor unit is completed using
the Comfort Sync Wi-Fi
®
thermostat. Please refer to the
Comfort Sync Wi-Fi
®
Installer’s System setup Guide for
complete details on how to integrate this unit into a Comfort
Sync
®
-enabled system.
Control Wires
Maximum length of wiring (18 gauge) for all connections
on the RSBus is 1500 feet (457 meters). Wires should
be color-coded, with a temperature rating of 95ºF (35ºC)
minimum, and solid-core (Class II Rated Wiring). All low
voltage wiring must enter unit through field-provided field-
installed grommet installed in electrical inlet.
The Comfort Sync Wi-Fi
®
thermostat requires four
thermostat wires between the thermostat and the furnace /
air handler Comfort Sync
®
control and four wires between
the outdoor unit and the furnace/air handler Comfort Sync
®
control. When a thermostat cable with more than four wires
is used, the extra wires must be properly connected to
avoid electrical noise (Figure 7).
Use a wire nut to bundle the four unused wires at each
end of the cable. Each bundle should also include an
additional wire that should be connected on each end to
the C terminal as shown in Figure 7.
High Voltage and Ground Wires
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 on the bottom of
the control box. Connect conduit to the control box using a
proper conduit fitting.
