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O
B
Y2
Reversing
Valve
Reversing
2nd Stage
Energized in
Valve
Compressor
Heat, Off,
Energized in
Emergency
Cool Mode
Mode
Figure 4. Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems
*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.
Refer to equipment manufacturers' instructions for specific
system wiring information.
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 off
SYSTEM
SYSTEM
SYSTEM
SYSTEM
SYSTEM
L L L L L
Heat
Fault
24 Volt
Pump 1
Indicator
(Common) (Hot)
or System
Heat
Malfunction
Pump 2
Switch
*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.
O
Reversing
Valve
Energized in
Cool Mode
Figure 5. Typical wiring diagram for single transformer multi-stage systems
*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.
Polarity must be observed. If the HOT side of the second transformer
is jumpered to the COMMON side of the first transformer a short will
be made. Damage to equipment will occur when power is restored.
Y1
G
W2
Fan
Relay
Aux
Compressor
Heat
Contactor
Relay
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Heat Pump Terminal Outputs
Heat Pump Terminal Outputs
Heat Pump Terminal Outputs
Heat Pump Terminal Outputs
Heat Pump Terminal Outputs
THERMOSTAT TERMINALS (HEAT PUMP)
THERMOSTAT TERMINALS (HEAT PUMP)
THERMOSTAT TERMINALS (HEAT PUMP)
THERMOSTAT TERMINALS (HEAT PUMP)
THERMOSTAT TERMINALS (HEAT PUMP)
C*
C*
C*
C*
C*
R R R R R
W2
W2
W2
W2
W2
24 Volt Heat Mode Emergency
2nd stage,
Emergency 1st stage
Mode 2nd
stage
Heat Mode
3rd stage,
Emergency
Mode 2nd
stage
B
Y1
Y2
Compressor
Contactor
Reversing
Stage 2
Valve
Energized in
Heat Mode
Compressor
Off Emergency
Contactor
Stage 1
NOTE
E/W1
*
C
L
R
Emergency
SYSTEM
Heat
MONITOR
Relay
SWITCH
COMMON
one 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 heat pump system. After wiring,
see CONFIGURATION section for proper thermostat configu-
ration.
E/W1
E/W1
E/W1
E/W1
E/W1
Y2
Y2
Y2
Y2
Y2
Y1
Y1
Y1
Y1
Y1
No
Heat and
Mode
Output
Cool mode
1st stage
2nd
(compressor) Set GAS/ELEC switch
stage
compressor
E/W1
G
W2
Heat
Relay
Stage 1
Heat
Fan
Relay
Relay
Stage 2
WIRING DIA
WIRING DIA
WIRING DIA
WIRING DIA
WIRING DIAGRAMS
THERMOSTAT
SYSTEM
Limit or
Safety
24 VAC
120 VAC
Switches
24 VAC
Auxiliary
ACCESSORY
Heating
RELAY N.O.
Transformer
The accessory relay scheme
CONTACT
(Class II
is
Current Limited)
circuits exist in both systems.
COMMON
Limit or
Limit or
Safety
Safety
Switches
Switches
24 VAC
120 VAC
Heat Pump Transformer
(Class II Current Limited)
G G G G G
Blower/Fan Energized Energized Energized
on call for Heat
in Cool
and Cool
for Emergency mode
THERMOSTAT
*
C
R
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
(Class II, Current Limited)
GRAMS
GRAMS
GRAMS
GRAMS
Limit or
Safety
HOT
Switches
NEUTRAL
NOTE
required
when
safety
HOT
NEUTRAL
O O O O O
B B B B B
in Heat
Mode
OFF
Emergency
mode
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