Figure 3. Typical wiring diagram for single transformer
heat pump systems
Figure 4. Typical wiring diagram for two transformer heat
pump systems with NO safety circuits
Figure 5. Typical wiring diagram for two transformer heat
pump systems with safety circuits in BOTH systems
Figure 6. Typical wiring diagram for single transformer
multi-stage systems
Heat Pump Terminal Outputs
Refer to equipment manufacturer’s instructions for
specific system wiring information. You can configure
the thermostat for use with the following heat pump
system types: 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 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 configuration.
INSTALLER/CONFIGURATION MENU
SYSTEM
Heat Pump 1
L
Malfunction
C*
24 Volt (Common)
R
24 Volt Emergency (hot)
E/W1
Emergency Mode 1st stage
W2
HP 1 and Emergency 2nd stage
Y1
Heat and Cool mode 1st stage (compressor)
G
Blower/Fan Energized on call for Heat and Cool
Set GAS/ELEC switch for Emergency mode
O
Energized in Cool Mode
B
Energized in Heat Emergency mode
CHECK THERMOSTAT OPERATION
Note: To prevent static discharge problems, touch side of
thermostat to release static build-up before touching
any keys.
If at any time during testing your system does not operate
properly, contact a qualified service person.
Fan Operation
If your system does not have a G terminal connection, skip
to
Heating System.
1. Turn on power to system.
2. Move FAN switch to ON position. The blower should
begin to operate.
3. Move FAN switch to AUTO position. The blower should
stop immediately.
Heating System
1. Move system switch to heat mode. If the auxiliary
heating system has a standing pilot, be sure to light it.
2. Press to adjust thermostat setting to 1°F/1°C above
room temperature. The heating system should begin to
operate. The display should show STG1. However, if the
setpoint temperature display is flashing, the compressor
lockout feature is operating (see CONFIGURATION
MENU, item 5).
3. Adjust temperature setting to 3°F/3°C above room
temperature. If your system configuration is set at MS2,
HP2 or HP1, the auxiliary heat system should begin to
operate and the display should show STG1+2.
4. Press to adjust the thermostat below room
temperature. The heating system should stop operating.
Emergency System
EMER bypasses the heat pump to use the heat source
wired to terminal E on the thermostat. EMER is typically
used when compressor operation is not desired, or you
prefer back-up heat only.
1. Press system switch to select heat. Then press EMER
key. EMER will show on the display.
2. Press to adjust thermostat setting above room
temperature. The auxiliary heating system will begin to
operate. The display will show STG1 EMER to indicate
that the auxiliary system is operating.
3. Adjust temperature setting to 2°F/2°C above room
temperature. The auxiliary heat system should begin to
operate and the display should show STG1+2.
4. Press to adjust the thermostat below room
temperature. The auxiliary heating system should stop
operating.
Cooling System
1. Move system switch to select the COOL.
2. Press to adjust thermostat setting below room
temperature. The blower should come on immediately
on high speed, followed by cold air circulation. The
display should show STG1.
3. Press to adjust the temperature setting above room
temperature. The cooling system should stop operating.
CONFIGURATION MENU
INSTALLER/CONFIGURATION MENU
Step Press
Button
Displayed
(Factory
Default)
Press
down key
to select
Comments
1
F
MS 2
SS1, HP2,
HP1
Selects Single
stage, Multi-stage
or Heat Pump
(Single stage or
2-stage) System
Configuration
2
F
(DIFF)2
1,3
DIFF (one stage)
3
F
(BLIT)on
off
BackLight
4
F
(SP2)2
1,3
DIFF (Two Stage)
5
F
(TEMP)F
C
Selects
temperature
display °F or °C
6
F
HOUR(12)
24
Selects time format
display 12 hours or
24 hours
7
F
COMP(OFF)
ON
Selects Compressor
Lockout OFF or ON
8
F
FACT(0)
1,2
Select 1 to reset to
factory defaults.
The configuration menu allows you to set certain
thermostat operating characteristics to your system
or personal requirements. Set SYSTEM switch to OFF,
then simultaneously press up and down keys to enter
configuration menu. The display will show the first item
in the configuration menu. The configuration menu table
summarizes the configuration options. An explanation
of each option follows. Press F key to change to the next
menu item. To exit the menu and return to the normal
operation, press RUN. If no keys are pressed within fifteen
seconds, the thermostat will revert to normal operation.
1) Single Stage, Multi-stage or Heat Pump System
Configuration. This control can be configured for heat
pump or two stage heat/one stage cool multi-stage
operation. The display shows MS 2 (default for multi-
stage mode). The multi-stage configuration can be
toggled to SS1, or HP1 by pressing the up or down key.
In Multi-stage configuration, EMER mode is not used. In
this model, the HP2 is not used.
2) Fast or slow cycle selection (one stage)
3) Select backlight function OFF or ON
4) Fast or slow cycle selection (two stage)
5) Select °F or °C readout
6) Selects 12 hour or 24 hour time format
7) Select Compressor Lockout COMP OFF or ON Selecting
COMP ON will cause the thermostat to wait 4 minutes
before turning on the compressor if the heating and
cooling system loses power. It will also wait a minimum
of 4 minutes between cooling and heating cycles. This
protects the compressor from short cycling. Some
newer compressors already have a time delay built
in and do not require this feature. Your compressor
manufacturer can tell you if the lockout feature is
already present in their system. When the thermostat
compressor time delay occurs it will flash the setpoint
for about four minutes.
8) Select 1 to reset to factory defaults.
Setting Day and Time
• The LCD will show this information
when batteries are first installed.
The temperature will update after
a few seconds.
• During time and day setting mode, the
temperature displays will go blank.
Refer to the steps below.
STEP 1:
• Press to enter time and day setting
mode. The current hour and the
AM/PM indicator will be flashing.
• Press up or down to change the hour
to the current hour.
Note the AM/PM indicator, as the display will
change at 12AM and 12PM.
STEP 2:
• Press again to change from hour
setting to minute setting. The current
minute will be flashing.
• Press up or down to change the
minute to the current minute.
STEP 3:
• Press again to change from minute
setting to day setting. The current
days will be flashing.
• Press up or down to change the day
to the current day.
STEP 4:
• Press again to change back to the
normal display.
Reviewing the Current Temperature Setting
Current time and temperature.
• Press less than 1 second.
• Set temperature is shown above
current room temperature.
OPERATION
System Selector Switch
The System Selector Switch on the front of the
thermostat determines the operating mode of
the thermostat. You may select COOL , OFF, or
HEAT to take full advantage of this thermostat’s feature.
NOTE: Anytime you install or remove the thermostat from
the wallplate, slide the System Selector to OFF to prevent
the possibility of a rapid system ON-OFF.
Fan Switch
The fan switch should normally be set to the
AUTO position. The fan will turn on along
with normal operation of your system. In a
normal gas or oil furnace, the fan will be turned on by
your furnace after its warm-up delay. For electric heat, air
conditioning, and heat pump operation, the fan will turn
on with the system. To run the fan continuously, slide the
fan switch to the ON position.
