White Rodgers 1F85-0422 User Manual
80 Series Thermostat
Wiring Diagrams for 1F83-0422 & 1F85-0422
Single Stage, Multi-Stage, Heat Pump
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.
Figure 1 – Heat Pump Systems
Jumper
System
Heat Pump 1
(HP1)
Comfort Alert II Module
or Similar System
Malfunction Module
L
Fault Indicator
or
System
Malfunction
Switch
O/B
O
Energized in
Cool Mode
B
Energized in
Heat, Off,
Emergency
Mode
Y
Heat and
Cool Mode
1st Stage
(Compressor)
Y2
No
Output
W/E
Emergency
Mode
1st Stage
W2
Heat Mode
2nd Stage.
Emergency
Mode 2nd
Stage
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 twotransformer system.
You can confi gure the thermostat for use with the following fossil fuel
systems:
HEAT PUMP TYPE 1 (HP 1). Single stage compressor system; gas
or electric backup.
Jumper
C
RC
RH
G
NOTE: If your system
does not provide an E
connection, jumper W2 to
W/E to use the Auxiliary
Blower/
Circulator
Fan Energized
on Call for
Heat or Cool.
Set Elect/Gas
Option for
Emergency
Mode
24 Volt
(Hot)
Heat
24 Volt
(Hot)
Cool
Optional*
24 Volt
(Com-
mon)
NEUTRAL
24VAC
HOT
CLASS II
TRANSFORMER
120VAC
Heat in the Emergency
Mode.
* Common connection
required for fault or
malfunction indication.
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.
Figure 2 – Single Stage or Multi-Stage System (No Heat Pump) with Single Transformer
Jumper
System
Single
Stage 1
(SS1)
MultiStage 2
(MS2)
Comfort Alert II Module
or Similar System
Malfunction Module
L
Fault
Indicator
or
System
Malfunction
Switch
O/B
O
Energized Constantly
in
Cool Mode
B
Energized Constantly
in Heat, Off,
Emergency
Mode
Y
Cool Mode
1st Stage
Y2
No
Output
Cool
Mode
2nd
Stage
W/E
Heat
Mode
1st Stage
W2
No Output
Heat Mode
2nd Stage
G
Blower/
Circulator
Fan Energized
on Call for
Cool (and
Heat if
configured
for Electric
Heat)
RH
24 Volt
(Hot)
Heat
RC
24 Volt
(Hot)
Cool
C
Optional*
24 Volt
(Com-
mon)
NEUTRAL
24VAC
HOT
CLASS II
TRANSFORMER
* Common connection
required for fault or
malfunction indication.
120VAC
www.white-rodgers.com
PART NO. 37-6895B
Replaces 37-6895A
0825
System
Single
Stage 1
(SS1)
MultiStage 2
(MS2)
L
Fault
Indicator
(NOT
USED)
Figure 3 – Single Stage or Multi-Stage System (No Heat Pump)
with Two Transformers
Remove Jumper Wire
Jumper
between RH & RC
O
Energized
Constantly
in
Cool Mode
O/B
Energized
Constantly
in Heat, Off,
Emergency
Mode
Y
B
Cool Mode
1st Stage
No
Output
Cool
Mode
2nd
Stage
Heat
Mode
1st Stage
W2
No Output
Heat Mode
2nd Stage
Blower/
Circulator
Fan Energized
on Call for
Cool (and
Heat if
configured
for Electric
Heat)
W/E
Y2
RH
G
24 Volt
(Hot)
Heat
RC
24 Volt
(Hot)
Cool
C
Optional
24 Volt
(Com-
mon)
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.
120VAC
HEATING
CLASS II
TRANSFORMER
NEUTRAL
24VAC
HOT
System
Single Stage
3-wire
Zone Valve
application
6
Closes
Val ve
(6)
NEUTRAL
24VAC
HOT
TRANSFORMER
Figure 4 – 3-Wire (SPDT) Heat Only Zone Valve Wiring
Jumper
Y
W
Opens
Val ve
(4)
G
Blower/Circulator
Fan Energized
RH
24 Volt
(Hot)
Heat
(5)
RC
24 Volt
(Hot)
Cool
C
Constant
24 Volt
(Com-
mon)
CLASS II
NEUTRAL
24VAC
HOT
120VAC
COOLING
CLASS II
TRANSFORMER
120VAC
White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
St. Louis, Missouri
www.white-rodgers.com
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