Table of Contents
Advertisement
NOTE
The following wiring diagrams show typical terminal identifica-
tion and wiring. For proper installation, refer to the original
manufacturer's instructions.
Y
Y2
Compressor
Contactor
Stage 2
Compressor
Contactor
Stage 1
CUT AND
TAPE OFF!
Hot
120 VAC
24 VAC
Neutral
TRANSFORMER
Compressor
Contactor
Stage 1
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 3. Typical wiring diagram for two-transformer systems with NO safety circuits
Y
Y2
Compressor
Contactor
Stage 2
Compressor
Contactor
Stage 1
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 4. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
Thermostat
Control
Circuit
W2
G
W
Heat
Relay
Stage 1
Heat
Fan
Relay
Relay
Stage 2
Figure 2. Typical wiring diagram for single transformer systems
Y
Y2
G
W
Heat
Compressor
Relay
Contactor
Stage 1
Stage 2
Fan
Relay
Thermostat
Control
Circuit
W2
G
W
Heat
Relay
Stage 1
Heat
Fan
Relay
Relay
Stage 2
Relay contacts shown are thermostatically operated.
THERMOSTAT
C*
R
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
Thermostat
Control
Circuit
THERMOSTAT
W2
C*
R
24 VAC
Heat
Relay
TRANSFORMER
Stage 2
THERMOSTAT
C*
R
SYSTEM
Limit or
Safety
24 VAC
Switches
24 VAC
Accessory
Relay N.O.
TRANSFORMER
Contact
Common
Limit or
Safety
Switches
24 VAC
Common
COOLING
TRANSFORMER
3
NOTE
* 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.
* 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.
SYSTEM
Hot
120 VAC
Neutral
* 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
Limit or
Safety
Hot
Switches
120 VAC
Neutral
®
alkaline
Hide quick links:
Advertisement
Table of Contents
