GAS FURNACE
Page 24
505023M 08/11
GAS FURNACE
Wiring for Gas Furnace and Outdoor AC Unit
IMPORTANT!
DO NOT
MAKE CON-
NECTIONS
TO Y1 AND
Y2
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
auxiliary (backup) heat to pro-
vide all heating (disallows heat
pump from providing any heat).
Y1
Y2
C
R
R
G
W1
W2
C
DS
Y1
Y2
DAMPERS
(Spring open,
power close)
See System Configuration & E−Heat jumper settings − page 11.
PIAB jumper settings − page 8.
Air reduc-
tion jumper
settings −
page 9.
Heat/cool staging
jumper settings −
page 10.
120
VAC
24
VAC
IMPORTANT! Connectivity is NOT COMPLETE until all elec-
trical adjustments (jumpers and wiring changes) have been
made. See Integrated Control Electrical Adjustments (begin-
ning on Page 28).
IMPORTANT
Connect
thermostat-gauge
wire to integrated
control C" terminal
Thermostat 2 Thermostat 1
W C Y G R W C Y G R
Variable
Speed
Furnace
2-Stage Condensing
Unit shown (No Y2
wire on 1−Stage Unit)
140F DAS
jumper
pages 8
& 10.
NOTE − Do not wire Y" wire(s) from the
Harmony IIIt zone control panel to the fur-
nace terminal strip. Doing so causes the
motor to search" for proper CFM.
ON G71MPP &
SLP98 Furnace −
W2 Not required,
but may be
connected to
increase firing rate.
DISCHARGE AIR SEN-
SOR 88K38 (included)
Connections for REMOTE
VACATION SWITCH OR
Humiditrol
®
Zoning Ac-
cessory
CONNECT TO
THE SAME
POWER
SUPPLY AS
THE GAS
FURNACE
SEE IMPORTANT
NOTE BELOW!
NOTE:
SELECT # OF
COOL STAGES
BY PLACING
JUMPER IN
APPROPRIATE
POSITION.
(2−STG CLG
SHOWN)
ZONE CONTROL
TRANSFORMER
Figure 17. Harmony IIIt Zone Control System Option 1 −
Lennox Variable-Speed Gas Furnace & 1− or 2-Stage Air Conditioner
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