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WIRING DIAGRAMS
Figure 1 – Heat Pump Systems
HM
O/B
DHM
Y2
System
Heat
No
Pump 1
1st
Usually
Ener-
Output
(HP1)
Stage
Energized.
gized
Heat &
De-
Change
on call
Cool
energized
over
for
(Com-
on call for
2nd
relay
Heat
humidi-
Stage
pressor)
dehumidifi-
***
Pump 2
fication
Heat/
cation
(HP2)
Cool
(Com-
pressor)
NOTE: If your system does not provide an E connection,
jumper W2 to W/E to use the Auxiliary Heat in the
Emergency Mode.
Required for fault or malfunction indication,
remote temperature sensor, or for continuous
backlight operation.
Figure 2 – Single Stage or Multi-Stage System (No Heat Pump)
HM
O/B
DHM
Y2
System
Single
No
Stage 1
Cool
Usually
Output
Ener-
(SS1)
Mode
Energized.
Change
gized
1st
De-
on call
over
Stage
energized
Cool
for
relay
(Com-
on call for
Multi-
mode
humidi-
***
pressor)
dehumidifi-
Stage 2
2nd
fication
cation
(MS2)
Stage
(Com-
pressor)
Required for fault or malfunction indication,
remote temperature sensor, or for continuous
backlight operation.
Figure 3 – Single Stage or Multi-Stage System (No Heat Pump)
HM
O/B
DHM
System
Single
No
Stage 1
Usually
Output
Ener-
(SS1)
Energized.
gized
Change
De-
on call
over
energized
for
Cool
relay
on call for
Multi-
humidi-
mode
***
dehumidifi-
Stage 2
fication
2nd
cation
Stage
(MS2)
(Com-
pressor)
NEUTRAL
120VAC
24VAC
HOT
HEATING
CLASS II
TRANSFORMER
* 24 VAC common connection optional for system operation.
** Dual fuel option de-energizes compressor when auxiliary heat is energized.
*** Changeover relay is energized in cool if O is selected. Changeover relay is energized in heat and emergency if B is selected.
To Remote Temperature Sensor
Jumper
RC
RH
Y1
G
C
+
Blower/
DC
Circula-
supply
24 VAC
tor Fan
voltage
Com-
24 VAC
24 VAC
Energiz-
to re-
mon
(Hot)
(Hot)
ed on
mote
Heat
(option-
Cool
call for
Temp-
al) *
Heat or
erature
**
Cool
Sensor
with Single Transformer
To Remote Temperature Sensor
Jumper
G
RC
RH
C
Y1
+
Blower/
Circula-
DC
tor Fan
supply
24 VAC
Energiz-
voltage
Com-
24 VAC
24 VAC
ed on
to re-
mon
(Hot)
(Hot)
call for
mote
Heat
(option-
Cool
Cool &
Temp-
al) *
for Heat
erature
(if ELE
Sensor
is sel-
ected)
with Two Transformers
To Remote Temperature Sensor
Y2
Y1
G
RC
RH
C
Blower/
Circula-
DC
tor Fan
Cool
supply
24 VAC
Energiz-
Mode
voltage
Com-
24 VAC
24 VAC
ed on
1st
to re-
mon
(Hot)
(Hot)
call for
Stage
mote
(option-
Cool
Heat
Cool &
(Com-
Temp-
al) *
for Heat
pressor)
erature
(if ELE
Sensor
is sel-
ected)
Jumper
S
-
W2
W/E
6
(Dual
Fuel
disabled)
Power
DC
Emer-
Return
Closed
Remote
gency
Auxil-
Conn-
Temp-
to
heat
iary &
2nd stage
ection
erature
Remote
Emer-
Temp-
for
Sensor
(Dual
gency
Fuel
erature
3-wire
signal
Heat
enabled)
zone
Sensor
Auxiliary
1st
& Emer-
valve
Stage
gency
heat
2nd stage
S
-
W2
W/E
6
Ener-
gized
Power
DC
No
on call
Return
Output
Closed
Remote
for
to
Conn-
Temp-
Heat
ection
erature
Remote
Temp-
for
Sensor
erature
Heat
Heat
3-wire
signal
Mode
Mode
zone
Sensor
1st
2nd
valve
Stage
Stage
S
+
-
W2
W/E
6
Ener-
gized
No
DC
Power
on call
Output
Return
Remote
Closed
for
to
Temp-
Conn-
Heat
Remote
erature
ection
Temp-
Sensor
for
Heat
Heat
erature
signal
3-wire
Mode
Mode
Sensor
zone
2nd
1st
valve
Stage
Stage
Heat Pump Connections
If you do not have a heat pump system, refer
to fi gures 2 & 3.
Refer to equipment manufacturers' instructions
for specifi c system wiring information.
You can confi gure the thermostat for use with
the following heat pump systems.
HEAT PUMP TYPE 1 (HP 1)
compressor system; gas or electric backup.
HEAT PUMP TYPE 2 (HP 2).
compressor or two compressor system with
gas or electric backup.
After wiring, see
NEUTRAL
120VAC
24VAC
INSTALLER
HOT
CONFIGURATION
CLASS II
section for proper
TRANSFORMER
thermostat
confi guration.
Single Stage and Multi-Stage
Connections
Refer to equipment manufacturers' instructions
for specifi c system wiring information.
This thermostat is designed to operate a single-
transformer or two-transformer system.
You can confi gure the thermostat for use with
the following fossil fuel systems:
SINGLE STAGE (SS 1)
gas, oil or electric.
MULTI-STAGE (MS 2)
gas, oil or electric.
After wiring, see INSTALLER CONFIGURATION
section for proper thermostat confi guration.
NEUTRAL
120VAC
24VAC
HOT
CLASS II
TRANSFORMER
NOTE: If continuous backlight or hardwired
power input are desired but do not function in
both HEAT and COOL modes, cut the heating
transformer 24V wires and tape off. Connect the
neutral circuit disconnected from the heating
transformer to the neutral circuit of the cooling
transformer. Disconnect the wire to the RH
terminal and install a jumper between RH and
RC. Depending on the system requirements,
replace the cooling transformer with a 75VA
class II transformer if needed.
NEUTRAL
24VAC
120VAC
HOT
COOLING
CLASS II
TRANSFORMER
.
Single stage
Multi-stage
3
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