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4
MOUNTING AND WIRING
CONTINUED FROM PAGE 3
Refer to equipment manufacturers' instructions for specific sys-
tem wiring information.
You can configure the thermostat for use with either multi-stage
electric heat systems or multi-stage gas systems. When config-
ured for electric heat, the G terminal (blower/fan) will be ener-
gized on a call for heat.
This thermostat is designed to operate a single-transformer
system. If you have a two-transformer system, cut and tape of one
SYSTEM
L
Multi-Stage
Malfunction
Light
*O/B switch must be in "O" position
Refer to equipment manufacturers' instructions for specific sys-
tem wiring informtion.
You can configure the thermostat for use with the following heat
pump system types:
HEAT PUMP TYPE 1. Single-stage compressor system; gas or
electric backup.
This thermostat is designed to operate a single-transformer
system. If you have a two-transformer system, cut and tape of one
SYSTEM
L
Single-stage compressor system; gas or electric backup
Heat Pump 1
Malfunction
Light
O/B/Y2*
Y1
G
Compressor
Contactor
Stage 2
Compressor
Fan
Contactor
Relay
Stage 1
*O/B Switch must be in "O" position
Figure 5. Typical wiring diagram for single transformer multi-stage systems
Multi-stage Terminal Outputs
C
R
W2
24 Volt
24 Volt
Heat mode
(Common)
(Hot)
2nd stage
Heat Pump Terminal Outputs
C
R
W2
24 Volt
24 Volt
Heat mode
(Common)
(Hot)
3rd stage.
Emergency mode
2nd stage
E/W1
W2
C*
R
Heat
Relay
Stage 1
Heat
Relay
Stage 2
transformer. If transformer safety circuits are in only one of the
systems, remove the transformer of the system with NO safety
circuits. If required, replace remaining transformer with a 75VA
Class II transformer. After disconnecting one transformer, the two
commons must be jumpered together.
Use the terminal output information below to help you wire the
thermostat properly for your multi-stage system. After wiring, see
CONFIGURATION section for proper thermostat configuration.
THERMOSTAT TERMINALS
E/W1
Heat mode
Cool Mode
1st stage
transformer. If transformer safety circuits are in only one of the
systems, remove the transformer of the system with NO safety
circuits. If required, replace remaining transformer with a 75VA
Class II transformer. After disconnecting one transformer, the two
commons must be jumpered together.
Use the terminal output information below to help you wire the
thermostat properly for your multi-stage system. After wiring, see
CONFIGURATION section for proper thermostat configuration.
THERMOSTAT TERMINALS
E/W1
Heat mode
No Output
2nd stage
B: Energized in Heat, Off,
Emergency Mode
O: Energized in Cool Mode
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THERMOSTAT
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
(Class II, Current Limited)
(O/B)Y2*
Y1
Cool mode
2nd stage
1st stage
(O/B)Y2
Y1
Heat and
Cool mode
1st stage
(compressor)
G
Blower/Fan Energized
on call for Cool (and
Heat if configured
to Electric Heat)
G
Blower/Fan Energized
on call for Heat
and Cool
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