
Wiring
Caution:
Electrical Hazard
All components of the control
system and the thermostat
installation must conform to
Class II circuits per the NEC Code.
Warning:
Do not overtighten terminal
block screws, as this can
damage the terminal block.
A damaged terminal block
can keep the thermostat
from tting on the subbase
correctly or cause system
operation issues.
Installation Tip
Max Torque = 6in-lbs.
Wiring
If you are replacing a thermostat,
make note of the terminal
connections on the thermostat that
is being replaced. In some cases
the wiring connections will not be
color coded. For example, the
green wire may not be connected
to the Gterminal.
Loosen the terminal block screws.
Insert wires then retighten terminal
block screws.
Place nonammable insulation into
wall opening to prevent drafts.
1.
2.
3.
Terminal Designations
C
OHeat pump changeover valve
energized in cooling
Heat pump changeover valve
energized in heating
WHeat relay
RH Transformer power
for heating
RC Transformer power
for cooling
GFan relay
YCompressor relay
Wiring Tips
RH & RC Terminals
For single transformer systems, leave the
jumper wire in place between RH and RC.
Remove jumper wire for two transformer
systems.
Heat Pump Systems
If wiring to a heat pump, use a small piece
of wire (not supplied) to connect
terminals W and Y.
(With NO AUX or
Emergency Heat)
C Terminal
The C (common wire) terminal does
not have to be connected when the
thermostat is powered by batteries.
Wire Specications
Use shielded or non-shielded 18-22
gauge thermostat wire.
Failure to disconnect the power
before beginning to install this
product can cause electrical shock
or equipment damage.
B
Common wire from secondary side of
cooling system transformer
Wiring Diagrams
Power supply
Factory-installed jumper. Remove only when installing on 2-transformer systems
Use either O or B terminals for changeover valve
Use a small piece of wire (not supplied) to connect W and Y terminals
Set fan operation switch to Electric
Optional 24 VAC common connection when thermostat is used in battery power mode
Typical 1H/1C System: 1 Transformer Typical 1H/1C System: 2 Transformer
COMPRESSOR
RELAY
HEAT RELAY
FAN RELAY
Typical 1H/1C Heat Pump System Typical Heat-Only System
Typical Heat Only System With Fan Typical Cool-Only System
COMPRESSOR
RELAY
HEAT RELAY
FAN RELAY
RC
RH
Y
C
W
G
C
R
L2
L1(HOT) RC
RH
Y
C
W
G
L2
L1(HOT)
REMOVE JUMPER C
R
COMPRESSOR
RELAY
FAN RELAY
COOL CHANGE
OVER VALVE
HEAT CHANGE
OVER VALVE
OB
C
R
L2
L1(HOT)
RC
RH
Y
C
W
GHEAT RELAY
RC
RH
Y
C
W
G
C
R
L2
L1(HOT)
FAN RELAY
HEAT RELAY
RC
RH
Y
C
W
G
C
R
L2
L1(HOT)
FAN RELAY
COMPRESSOR
RELAY
C
R
L2
L1(HOT)
RC
RH
Y
C
W
G
L2
L1(HOT)
Technician Setup Technician Setup
Swing Setting Tip
Temperature swing, sometimes called dierential or cycle rate, can be customized for
this individual application. For most applications choose a swing setting that is as
wide as possible without making the occupants uncomfortable.
To exit Swing & Limit Settings, slide the System Switch to
a dierent position or wait approximately 20 seconds.
Tech Settings
1. Select Heat or Cool with the System Switch.
2. Press and hold the + and - buttons together for 3 seconds.
3. Use the + and - to change setting for that step, press the + and -
simultaneously to change between tech settings.
Swing & Limit Settings
To exit Tech Settings, slide the System Switch to
a dierent position or wait approximately 20 seconds.
The compressor short cycle delay
prevents the compressor from
switching on and o too often.
Selecting “ON”will not allow
the compressor to be turned
on for 5 minutes after the
last time the compressor was
switched o. Select“OFF”to
remove this delay.
O
This feature allows the installer
to change the calibration of the
room temperature display. For
example, if the thermostat reads
70 degrees and you would like it
to read 72 then select +2.
0
CA
Room
Temperature
Calibration
You can adjust the room
temperature display to read
4˚above or below the factory
calibrated reading.
Compressor
Short Cycle
Delay ON
Cd
Select F for Fahrenheit
temperature read out or select C
for Celsius read out.
F for Fahrenheit
C for Celsius
F or C F
F
FC
This feature allows you to set a
minimum cool setpoint value.
The setpoint temperature can’t be
lowered below this value.
0.5
The swing setting often called
“cycle rate”,“dierential”or
“anticipation”is adjustable. A
smaller swing setting will cause
more frequent cycles and a larger
swing setting will cause fewer
cycles.
Cooling
Swing
The cooling swing setting
is adjustable from 0.2˚ to
2˚. For example: A swing
setting of 0.5˚will turn the
cooling on at approximately
0.5˚ above the setpoint
and turn the cooling o at
approximately 0.5˚ below
the setpoint.
Swing & Limit Settings
Cooling
Setpoint
Limit 44
The swing setting often called
“cycle rate”,“dierential”or
“anticipation”is adjustable. A
smaller swing setting will cause
more frequent cycles and a larger
swing setting will cause fewer
cycles.
The heating swing setting
is adjustable from 0.2˚ to
2˚. For example: A swing
setting of 0.5˚will turn the
heating on at approximately
0.5˚ below the setpoint
and turn the heating o at
approximately 0.5˚ above
the setpoint.
Heating
Swing 0.4
05
CO
This feature allows you to set a
maximum heat setpoint value.
The setpoint temperature can’t
be raised above this value.
Use the + and - key to
select the minimum cool
setpoint.
Heating
Setpoint
Limit 90
HE
04
Use the + and - key to
select the maximum heat
setpoint.
Tech Settings Adjustment Options Default
LCD Will Show Adjustment Options Default
LCD Will Show
1. Select OFF with the System Switch for Tech Settings. Select Heat or Cool for Swing
and Limit settings. They are set separately.
2. Hold down the + and - buttons together for 3 seconds.
3. Use the + and - to change setting for that step, and the glow in the dark light button to
move from one step to another.