Lennox Merit 13HPX Series Installation Instructions Manual page 19

ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING
HIGH VOLTAGE / 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 panel. Connect conduit to the control panel using a proper conduit fitting.
CONTROL WIRING
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.
B Make 24VAC thermostat wire connections to CMC1.
NOTE Do not bundle any excess 24VAC control wires inside
control panel.
NOTE For proper voltages, select thermostat wire (control
wires) gauge per table below.
WIRE RUN LENGTH
LESS THAN 100' (30 METERS)
MORE THAN 100' (30 METERS) 16
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
GROUND
CUTOUT FOR HIGH
VOLTAGE CONDUIT
NOTE Wire tie provides low voltage wire strain relief and to maintain separation of field installed low and high voltage circuits.
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AWG# INSULATION TYPE
18 TEMPERATURE RATING
35ºC MINIMUM.
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
SINGLE PHASE
CAPACITOR
DEFROST CONTROL
(CMC1)
search engine
Thermostat
R
C
W1
1ST. STAGE AUX.
G
INDOOR BLOWER
O
Y1
Low Voltage Wiring (with Auxiliary Heat)
Thermostat
R
C
E
CONTROL WIRE
B
CONNECTIONS
W1
1ST. STAGE AUX.
GROMMET AND WIRE
A
TIE FOR CONTROL
WIRES
G
O
Y1
Figure 14. Connections
Page 19
TYPICAL CONTROL WIRING
Low Voltage Wiring
Indoor Unit
R
POWER
POWER
C
COMMON COMMON
W1
1ST. STAGE AUX.
HEAT
W2
W3
G
REVERSING VALVE
COMPRESSOR
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Indoor Unit
R
POWER
POWER
C
COMMON
EMERGENCY
EMER.
HEAT HEAT
RELAY
W1
1ST. STAGE AUX.
W2
HEAT
HEAT
W3
G
INDOOR BLOWER
REVERSING VALVE
COMPRESSOR
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Outdoor Unit
R
C
W1
HEAT
O
Y1
Outdoor Unit
R
C
COMMON
OUTDOOR
T'STAT
W1
O
Y1
13HPX SERIES