Lennox Signature XP21 Series Installation And Service Procedure page 23

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A. 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 HEAT PUMP
CONTROL (A175) .
NOTE DO NOT BUNDLE ANY EXCESS 24VAC CONTROL WIRES INSIDE CON-
TROL 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
B. 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
º º
RATING 95 F (35 C) MINIMUM, SOLID CORE. (CLASS II RATED WIRING)
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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.
HIGH VOLTAGE
CONDUIT HOLE
WATERTIGHT
CONDUIT
FITTING
WATERTIGHT
FLEXIBLE
CONDUIT
TO AC DISCONNECT
BOX
NON−COMMUNICATING
AWG# INSULATION TYPE
18 TEMPERATURE RATING
35ºC MINIMUM.
COMMUNICATING
PIPING PANEL
CONTROL BOX
GROUND LUG
CONTACTOR
ELECTRICAL INLET (CONTROL WIRING
USE BUSHING PROVIDED IN BAG ASSEMBLY HERE.
B
HEAT PUMP
CONTROL (A175)
ELECTRICAL INLET
(HIGH VOLTAGE)
WIRING ENTRY POINTS
LOW VOLTAGE).
Page 23
CONTROL BOX
A
HOLE
ACCESS VIEW
XP21