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NOTE
The following wiring diagrams show typical terminal identifica-
tion and wiring. For proper installation, refer to the original
manufacturer's instructions.
B
O
Energized
in HEAT
Energized
in COOL
CUT AND
TAPE OFF!
Hot
120 VAC
24 VAC
Neutral
TRANSFORMER
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits
Y
G
Cooling
System
Fan
Relay
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
Thermostat
Control
Circuit
Y
G
W
Cooling
Heating
System
System
Fan
Relay
Figure 3. Typical wiring diagram for single transformer systems
Y
G
O
Cooling
Energized
System
in COOL
Fan
Relay
Thermostat
Control
Circuit
B
O
W
Energized
Heating
in COOL
System
Energized
in HEAT
Relay contacts shown are thermostatically operated.
* The 24 Volt neutral connection
THERMOSTAT
C*
R
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
Thermostat
Control
Circuit
B
C*
R
W
Heating
System
Energized
in HEAT
THERMOSTAT
C*
R
SYSTEM
Limit or
Safety
24 VAC
Switches
24 VAC
Accessory
Relay N.O.
Contact
Common
Limit or
Safety
Switches
24 VAC
Common
COOLING
TRANSFORMER
NOTE
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
®
fresh "AA" Energizer
alkaline
batteries.
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
®
fresh "AA" Energizer
batteries.
THERMOSTAT
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
®
fresh "AA" Energizer
alkaline
batteries.
Limit or
Safety
Hot
Switches
120 VAC
Neutral
HEATING
TRANSFORMER
Limit or
Safety
Hot
Switches
120 VAC
Neutral
alkaline
3
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