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441 06 1003 02 (10/2001)
Figure 6
ST 9120
WALL
THERMOSTAT
R
G
4
3
2
1
ISOLATION
RELAY
ELECTRONIC
FAN CONTROL
FURNACE #1
ELECTRONIC
FAN CONTROL
FURNACE #2
Thermostat Wiring For
Single Stage Heating
And Two Stage Cooling
WALL
THERMOSTAT
R
G
4
3
2
1
ISOLATION
RELAY
ELECTRONIC
FAN CONTROL
FURNACE #1
Thermostat Wiring For
Tw o Stage Heating And
Single Stage Cooling
W1
W2
Y
A/C
CONDENSER
C
Y
C
Y
A/C
CONDENSERS
W1
Y2
Y1
C
Y
25--23--82
Connect Z1 To Z1
Connect Z2 To Z2
Connect Z1 To Z1
Connect Z2 To Z2
ELECTRONIC
FAN CONTROL
FURNACE #2