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*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” 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” alkaline batteries.
Heat Pump ConnectionsHeat Pump Connections
Heat Pump ConnectionsHeat Pump Connections
Heat Pump Connections
Refer to equipment manufacturers' instructions for specific system wiring information. The thermostat can be configured for use
with the following heat pump systems:
HEAT PUMP TYPE 1 (HP 1). Single Stage compressor system; gas or electric backup, 2-heat/1-cool stages maximum.
HEAT PUMP TYPE 2 (HP 2). Multi-Stage compressor or two compressor system with gas or electric backup, 3-heat/2-cool stages
maximum.
See figure 2 below to help you wire the thermostat properly. After wiring, see CONFIGURATION section for proper thermostat
configuration.
Heat Pump 1
(HP1)
Heat Pump 2
(HP2)
Energized in
Cool Mode
Energized in
Heat, Off,
Emergency
Mode
No Output
2nd Stage
(Compressor)
Heat and
Cool Mode
1st Stage
(Compressor)
Blower/
Circulator
Fan Energized
on Call for
Heat or Cool.
Set Elect/Gas
Switch for
Emergency
Mode
Heat Mode
2nd Stage.
Emergency
Mode 2nd
Stage
Heat Mode
3rd Stage.
Emergency
Mode 2nd
Stage
Emergency
Mode
1st Stage
24 Volt
(Common)
Fault
Indicator
or
System
Malfunc-
tion
Switch
24 Volt
(Hot)
System
B
OY2
Y1
G
W2
E/W1
C*
LR
CLASS II
TRANSFORMER
HOT
24VAC
NEUTRAL
120VAC
NOTE: If your system
does not provide an E
connection, jumper W2 to
E/W1 to use the Auxiliary
Heat in the Emergency
Mode.
Figure 2 – Heat Pump Systems
Single
Stage 1
(SS1)
Multi-
Stage 2
(MS2)
Energized
Constantly
in
Cool Mode
Energized
Constantly
in
Heat, Off,
Emergency
Mode
No Output
Cool Mode
2nd Stage
Cool Mode
1st Stage
Blower/
Circulator
Fan Energized
on Call for
Cool (and
Heat) if
configured
for Electric
Heat
No Output
Heat Mode
2nd Stage
Heat
Mode
1st Stage
24 Volt
(Common)
Fault
Indicator
(NOT
USED)
24 Volt
(Hot)
System
B
OY2
Y1
G
W2 E/W1 C*
LR
CLASS II
TRANSFORMER
HOT
24VAC
NEUTRAL
120VAC
Figure 3 – Single Stage or Multi-Stage System (No Heat Pump)
Single Stage/Multi-Stage ConnectionsSingle Stage/Multi-Stage Connections
Single Stage/Multi-Stage ConnectionsSingle Stage/Multi-Stage Connections
Single Stage/Multi-Stage Connections
(No Heat Pump)(No Heat Pump)
(No Heat Pump)(No Heat Pump)
(No Heat Pump)
Refer to equipment manufacturers' instructions for specific system wiring information. The thermostat can be configured for use
with the following Single Stage and Multi-Stage systems:
SINGLE STAGE (SS 1). Gas, oil or electric, 1-heat/1-cool stage maximum.
MULTI-STAGE (MS 2). Gas, oil or electric, 2-heat/2-cool stages maximum.
See figure 3 below to help you wire the thermostat properly. After wiring, see CONFIGURATION section for proper thermostat
configuration.