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 thermo-
stat for use with the following heat pump system types: sin-
gle 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 thermo-
stat configuration.
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 1ºF/1ºC 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 3ºF/3ºC 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 2ºF/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
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 configura-
tion 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 dis-
play 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 heat-
ing 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) This model must select 1
9) This model must select 1 for factory default
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 sys-
tem. To run the fan continuously, slide the fan switch to the
ON position.
INSTALLER/CONFIGURATION MENU
Step
Press
Displayed
Press
Comments
Button
(Factory
down key
Default)
to select
1
F
MS 2
SS1, HP2,
Selects Single
HP1
stage, Multi-stage
or Heat Pump
(Single stage or
2-stage) System
Configuration
2
F
(RECO)off
on
No use
3
F
(DIFF)2
1,3
DIFF (one stage)
4
F
(BLIT)on
off
BackLight
5
F
(SP2)2
1,3
DIFF (Two Stage)
6
F
(TEMP)F
C
Selects temperature
display °F or °C
7
F
HOUR(12)
24
Selects time format
display 12 hours
or 24 hours
8
F
COMP(OFF)
ON
Selects Compressor
Lockout OFF or ON
9
F
COOL(1)
2
This model must
select 1
10
F
FACT(0)
1,2
This model must
select 1 for
factory defaults
THERMOSTAT TERMINALS (HEAT PUMP)
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
352-00021-002 Rev A 8/07
