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Installation Instructions
Sample Wiring Diagrams
Conventional Heating and Cooling Systems
3 Wire, Heat Only
Residential & Commercial 1 Stage Heating
with no Fan.
R
24VAC Power
C
24VAC Common
W1/O/B
1st Stage Heat
GAS
O
GAS/EL
5 Wire, 1 Stage Cooling, 1 Stage Heat
Residential & Commercial 1 Stage Cooling,
with 1 stage Gas Heat.
R
24VAC Power
C
24VAC Common
W1/O/B
1st Stage Heat
Y1
1st Stage Cool
G
Fan
GAS
O
GAS/EL
ELEC
B
HP
ELEC
B
HP
8 Wire, 2 Stage Cooling, 3 Stage Heat
Residential & Commercial 2 Stage Cooling,
with 3 stage Gas Heat.
R
24VAC Power
C
24VAC Common
W1/O/B
1st Stage Heat
W2
2nd Stage Heat
W3
3rd Stage Heat
Y1
1st Stage Cool
Y2
2nd Stage Cool
G
Fan
GAS
O
GAS/EL
4 Wire, Cool Only
Residential & Commercial 1 Stage Cooling.
R
24VAC Power
C
24VAC Common
Y1
1st Stage Cool
G
Fan
GAS
O
GAS/EL
5 Wire, 1 Stage Cooling, 1 Stage Heat
Residential & Commercial 1 Stage Cooling,
with 1 stage Electric Heat.
R
24VAC Power
C
24VAC Common
W1/O/B
1st Stage Heat
Y1
1st Stage Cool
G
Fan
GAS
O
GAS/EL
ELEC
B
HP
13
ELEC
B
HP
ELEC
B
HP
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