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Residential & Commercial 1 Stage Heating
with no Fan.
3 Wire, Heat Only
24VAC Power
24VAC Common
1st Stage Heat
Gas/Elec
O (not used)
Gas
Residential & Commercial 1 Stage Cooling.
4 Wire, Cool Only
R
C
Y1
G
J1 =
J2 =
J3 =
Installation Instructions
Conventional Heating and Cooling Systems
Residential & Commercial 1 Stage Cooling,
with 1 stage Gas Heat.
5 Wire, 1 Stage Cooling, 1 Stage Heat
24VAC Power
24VAC Common
1st Stage Heat
1st Stage Cool
Fan
Gas/Elec
O (not used)
Gas
Residential & Commercial 1 Stage Cooling,
with 1 stage Electric Heat.
5 Wire, 1 Stage Cooling, 1 Stage Heat
24VAC Power
24VAC Common
1st Stage Heat
1st Stage Cool
Fan
Gas/Elec
O (not used)
Electric
Residential & Commercial 2 Stage Cooling,
with 3 stage Gas Heat.
8 Wire, 2 Stage Cooling, 3 Stage Heat
24VAC Power
24VAC Common
1st Stage Heat
2nd Stage Heat
3rd Stage Heat
1st Stage Cool
2nd Stage Cool
Fan
Gas/Elec
O (not used)
Gas
Sample Wiring Diagrams
R
C
W1/O/B
Y1
G
J1 =
J2 =
J3 =
R
C
W1/O/B
Y1
G
J1 =
J2 =
J3 =
R
C
W1/O/B
W2
W3
Y1
Y2
G
J1 =
J2 =
J3 =
R
C
W1/O/B
J1 =
J2 =
J3 =
24VAC Power
24VAC Common
1st Stage Cool
Fan
Gas/Elec
O (not used)
Gas
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