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Thermostat
24 VAC HOT
FAN
24 VAC
Common
COOL
HEATING
• Units with pigtails require wirenuts for connections. Cap all unused wires.
• In AC systems for multiple stages of heat, jumper W1 and W2 together if comfort control has only one stage of heat.
* If equipped with second stage heat
** When using a BK enabled comfort control, cut BK jumper and bypass Y and YLo at the furnace. Connect BK from comfort control to
BK of the furnace
2 Stage AC Thermostat
AUX 1
AUX 2
24VAC HOT
COMMON
SOV
COOLING
FAN
HEATING
ODT
RS
10
With Furnace
Outdoor
Furnace
Unit
R
R
G
G
B/C
B
B
Y1
Y
Y
W1
W1
W2
W2
*
AUX 1
AUX 1
AUX 2
AUX 2
RC
RH
B/C
O
Y1
Y2
G
BK
W1
W2
W3
ODT
ODT
RS1
RS1
With Variable Speed Furnace
Thermostat
Furnace
R
R
24 VAC HOT
G
G
FAN
24 VAC
B/C
B
Common
O
Y1
Y
COOL
**
Y
LO
W1
W1
HEATING
W2
W2
*
BK
BK
**
INDOOR UNIT
OUTDOOR UNIT
R
B/C
O
Y1/YIo
Y/Y2
G
BK
W1
W2
Outdoor
Unit
B
Y
B
Y
18-AC123D1-1C-EN
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