Lennox Harmony III User Manual

48
5. dual Fuel (OPtiOn 3)
Follow all equipment installation instructions provided with each unit.
5.1. Zone Control System Wiring - Option 3
Aftertheheatpumpunitisinstalled,eldwirethelinevoltageasshowninthe
installation instructions provided with the unit. Use thermostat wire to connect the
heatpumptothezonecontrolpanelasillustratedinthefollowinggure.
IMPORTANT!
DO NOT MAKE
CONNECTIONS
TO Y1 AND Y2
Thermostat 2 Thermostat 1
W C Y G RW C Y G R
IMPORTANT! Connectivity is NOT COMPLETE until all
electrical adjustments (jumpers and wiring changes) have
BALANCE POINT
SENSOR Kit 10Z23
DAMPERS
(Spring open, power close)
PRESSURE SWITCH
21J18 (HFC-22)
27W13 (HFC-410A)
Y R B
120
VAC
24
VAC
Vacation OFF for individual
zone control.
Vacation ON for all zones to be
conditioned at the same time.
Emergency Heat OFF to allow
Heat Pump to provide heat.
Emergency Heat ON to force
vide all heating (disallows heat
pump from providing any heat).
R
C
Y1
Y2
O
W1
R
G
W1
W2
C
DS
Y1
Y2
IMPORTANT
Connect
thermostat‐gauge
wire to integrated
control “C” terminal
HEAT PUMP
VARIABLE
SPEED
FURNACE
NOTE - Do not wire “Y” wire(s) from the
furnace terminal strip. Doing so causes
the motor to “search” for proper CFM.
DT2 (S89) Limit Control (Optional [67M41], for defrost tempering kit)
ON G71MPP & SLP98
Furnace - W2 Not
required, but may
be connected to
increase firing rate.
SEE IMPORTANT NOTE BELOW!
NOTE: SELECT #
OF HP STAGES
BY PLACING
JUMPER IN
APPROPRIATE
POSITION. (2-STG
HP SHOWN)
CONNECT TO THE
SAME POWER
SUPPLY AS THE
GAS FURNACE
ZONE CONTROL
TRANSFORMER
Discharge Air Sensor (19V99)
Included
Connections for remote
vacation switch or
Humiditrol zoning
accessory
Figure 32. Option 3 - Typical Lennox Heat Pump and Lennox Variable-Speed Gas Furnace (Dual Fuel) (Troubleshooting)

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English