Lennox XC21 Series Unit Information page 23

3
ROUTE CONTROL WIRES
Install low voltage control wiring from outdoor to indoor unit and from
thermostat to indoor unit as illustrated.
A Run 24VAC control wires through hole with grommet.
B Make 24VAC control wire connections to main control (A175).
NOTE Do not bundle any excess 24VAC control wires inside control
box.
NOTE Wire tie provides low voltage wire strain relief and to maintain
separation of field installed low and high voltage circuits.
NOTE For proper voltages, select control wires gauge per table below.
WIRE RUN LENGTH
LESS THAN 100' (30 METERS)
MORE THAN 100' (30 METERS) 16
ROUTE CONTROL WIRES
Maximum length of wiring (18 gauge) for all connections on the RSBus is limited to 1500 feet (457 meters).
Color−coded, temperature rating 95
4
ROUTE 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 in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting.
GROUND LUGS
HIGH VOLTAGE
CONDUIT HOLE
WATERTIGHT
CONDUIT
FITTING
WATERTIGHT
FLEXIBLE
CONDUIT
TO SERVICE
DISCONNECT BOX
NON−COMMUNICATING
AWG# INSULATION TYPE
18 TEMPERATURE RATING
35ºC MINIMUM.
COMMUNICATING
º º
F (35 C) minimum, solid core. (Class II Rated Wiring)
PIPING PANEL
CONTROL BOX
CONTACTOR
ELECTRICAL INLET (CONTROL WIRING
USE BUSHING PROVIDED IN BAG ASSEMBLY USED HERE.
Page 23
B
MAIN CONTROL
(A175)
ELECTRICAL INLET
(HIGH VOLTAGE)
WIRING ENTRY POINTS
LOW VOLTAGE).
CONTROL BOX
A
HOLE
ACCESS VIEW
XC21