Wiring Diagrams; Dual Fuel Systems - Johnson Controls Hx 3 S1-THXU430W Installation Manual

5407934-UIM-C-1119
SECTION IX: WIRING DIAGRAMS
DUAL FUEL SYSTEMS (Furnace and Heat Pump)
THERMOSTAT
Single Stage HP Heat AND Cool
Single Stage Gas Heat
Tstat controls FFUEL & LTCO
OD Sensor
Req'd for use
of fossil fuel
operation
24 VAC
Outputs
THERMOSTAT
2-Stage HP Heat AND Cool
Single Stage Gas Heat
Tstat controls FFUEL & LTCO
OD Sensor
Req'd for use
of fossil fuel
operation
24 VAC
Outputs
Outdoor Equip Type = HP when thermostat uses dual fuel logic.
Select REMOTE SENSOR - OUTDOOR in the thermostat service menu.
Johnson Controls Ducted Systems
Single Stage Furnace
or Modulating Furnace
R
C
G
W1
W2
Y1
Y2
O/B
Single Stage Furnace
or Modulating Furnace
R
C
G
W1
W2
Y1
Y2
O/B
INDOOR
R
C
G
W
Y/Y2
INDOOR
R
C
G
W
Y1
Y/Y2
O
OUTDOOR
Single Stage HP
R
C
W
W1 out
Y
O
OUTDOOR
2-Stage HP
FFuel Jumper = OFF
LTCO Jumper = ON
R
C
W
W1 out
W2 out
Y1
Y2
Y2 out
O
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