Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS
CAREFULLY BEFORE INSTALLING OR OPERATING THIS
CONTROL COULD CAUSE PERSONAL INJURY AND/OR
PROPERTY DAMAGE.
APPLICATIONS
THERMOSTAT APPLICATION GUIDE
Description
Modulating PWM output, gas furnace Yes
Heat Pump (with Aux. or Emergency Heat), 2 Stage Yes
Systems with up to 3 Stages Heat, 2 Stages Cool Yes
Heat Only Systems Yes
Wired Remote Temperature Sensor (Indoor or Outdoor) Yes
Dual Fuel Feature (Heat Pump Mode) Yes
Compressor Fault Detection Yes
Humidifi cation Control Yes
Dehumidifi cation Control Yes
Please refer to the system installation and operating
manual for more detailed instructions and options.
Installation and Operating Instructions
for Hum/Dehum Modulating
Touchscreen Thermostat
Model Programming Choices
(-)HC-TST412MDMS
Modulating Touchscreen Thermostat
7 Day 5/1/1 Day Non-Programmable
(-)HC-TST412MDMS
SPECIFICATIONS
Electrical Rating:
Battery Power. . . . . . . . . . . . . . . . . . . . . . . . . . mV to 30 VAC, NEC Class II, 50/60 Hz or DC
Input-Hardwire . . . . . . . . . . . . . . . . . . . . . . . . . 20 to 30 VAC
Terminal Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A per terminal, 2.5A maximum all terminals combined
Setpoint Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 to 99°F (7 to 32°C)
Differential (Single Stage) . . . . . . . . . . . . . . . . . . . . Heat 0.6°F; Cool 1.2°F
Differential (Multi-Stage) . . . . . . . . . . . . . . . . . . . . . Heat 0.6°F; Cool 1.2°F
Differential (Heat Pump) . . . . . . . . . . . . . . . . . . . . . Heat 1.2°F; Cool 1.5°F
Operating Ambient. . . . . . . . . . . . . . . . . . . . . . . . . . 32°F to +105°F (0 to +41°C)
Operating Humidity . . . . . . . . . . . . . . . . . . . . . . . . . 90% non-condensing max.
Shipping Temperature Range . . . . . . . . . . . . . . . . . -4 to +150°F (-20 to +65°C)
Dimensions Thermostat. . . . . . . . . . . . . . . . . . . . . . 4.6"H x 5.9"W x 1.2"D
CAUTION
!
To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or circuit
breaker box until installation is complete.
Index Page
Installation 2
Wiring Connections 2
Wiring Diagrams 3
Thermostat Quick Reference 5
Installer Confi guration Menu 6
Operating Your Thermostat 10
Programming 12
Troubleshooting 15
ATTENTION: MERCURY NOTICE
This product does not contain mercury. However, this
product may replace a product that contains mercury.
Mercury and products containing mercury must not be
discarded in household trash. Do not touch any spilled
mercury. Wearing non-absorbent gloves, clean up any
spilled mercury and place in a sealed container. For proper disposal of a product containing mercury or a sealed
container of spilled mercury, place it in a suitable shipping
container. Refer to www.white-rodgers.com for location
to send product containing mercury.
PART NO. 37-6981A
0843
INSTALLATION
WARNING
!
Thermostat installation and all components of the
control system shall conform to Class II circuits per
the NEC code.
Remove Old Thermostat
A standard heat/cool thermostat consists of three basic parts:
1. The cover, which may be either a snap-on or hinge type.
2. The base, which is removed by loosening all captive
screws.
3. The switching subbase, which is removed by unscrewing
the mounting screws that hold it on the wall or adapter
plate. Before removing wires from old thermostat,
label each wire with the terminal designation from
which it was attached. Disconnect the wires from the old
thermostat one at a time. Do not let wires fall back into
the wall.
Installing New Thermostat
1. Pull the thermostat body off the thermostat base. Forcing
or prying on the thermostat will cause damage to the unit.
2. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
3. Move base out of the way. Drill mounting holes. If you
are using existing mounting holes and the holes drilled
are too large and do not allow you to tighten base snug ly, use plastic screw anchors to secure the base.
4. Fasten base snugly to wall using mounting holes shown
in Figure 1 and two mounting screws. Leveling is for
appearance only and will not affect thermostat operation.
5. Connect wires to terminal block on base using
appropriate wiring schematic (see diagram sheet
37-6809).
6. Push excess wire into wall and plug hole with a fi re re sistant material (such as fi berglass insulation) to prevent
drafts from affecting thermostat operation.
7. Carefully line the thermostat up with the base and snap
into place.
Battery Location
2 "AA" alkaline batteries are included in the thermostat at the
factory with a battery tag to prevent power drainage. Remove
the battery tag to engage the batteries.
To replace batteries, set system to OFF, remove thermostat
from wall and install the batteries in the rear along the top of
the thermostat (see Figure 1).
Figure 1 – (-)HC-TST412MDMS Base
Mounting
Hole
Place Level
across
Mounting Tabs
(for appearance only)
B
DHM
Y2
Rear view of thermostat
+
S
-
L
HM
W/E
6
V
Stack
Power
Stealing
Switch
Mounting
Hole
Place Level
across
Mounting Tabs
(for appearance only)
2 "AA" Batteries
Power
Stealing
Switches
WIRING CONNECTIONS
Refer to equipment manufacturers' instructions for specifi c
system wiring information. After wiring, see CONFIGURATION section for proper thermostat confi guration.
TERMINAL DESIGNATION DESCRIPTIONS
Terminal Designation Description
DHM . . . . . . . . . . . . . . . . . . De-humidifi cation Relay
Y2 . . . . . . . . . . . . . . . . . . . 2nd Stage Compressor
Y . . . . . . . . . . . . . . . . . . . Compressor Relay
G . . . . . . . . . . . . . . . . . . . Fan Relay
RC. . . . . . . . . . . . . . . . . . . Power for Cooling
RH. . . . . . . . . . . . . . . . . . . Power for Heating
C . . . . . . . . . . . . . . . . . . . Common wire from secondary side of cooling
V . . . . . . . . . . . . . . . . . . . PWM Output
6 . . . . . . . . . . . . . . . . . . . Powered closed 3rd wire for 3-wire Zone
W/E . . . . . . . . . . . . . . . . . . Heat Relay/Emergency Heat Relay (Stage 1)
HM . . . . . . . . . . . . . . . . . . Humidifi cation Relay
L . . . . . . . . . . . . . . . . . . . Compressor malfunction or Comfort Alert signal input
-. . . . . . . . . . . . . . . . . . . . Common (DC) for wired remote temperature sensor
S . . . . . . . . . . . . . . . . . . . Frequency signal from remote temperature sensor
+ . . . . . . . . . . . . . . . . . . . Power (DC) to remote temperature sensor
B . . . . . . . . . . . . . . . . . . . Changeover valve for heat pump energized constantly in heating mode (default ON)
2
For wiring diagrams, see next page.
Wiring diagrams shown are for typical systems and describe
the thermostat terminal functions.
WIRING DIAGRAM
Modulating Touchscreen Thermostat Wiring Diagrams (-)HC-TST412MDMS
Figure 2 – Typical Dual Fuel Application - Single Stage Heat Pump
DHM
DHM
Single Stage, Multi-Stage, Heat Pump
ODD
THERMOSTAT MODEL: (-)HC-TST412MDMS
REMOTE SENSOR: F145-1378 (OUTDOOR), F145-1328 (INDOOR)
PLENUM SENSOR: 47-21711-20
Figure 3 – Two Stage
ODD
V
THERMOSTAT MODEL: (-)HC-TST412MDMS
REMOTE SENSOR: F145-1378 (OUTDOOR), F145-1328 (INDOOR)
PLENUM SENSOR: 47-21711-20
Modulating Touchscreen Thermostat Wiring Diagrams (-)HC-TST412MDMS
Single Stage, Multi-Stage, AC
Figure 4 – Typical Single Stage AC
DHM
ODD
THERMOSTAT MODEL: (-)HC-TST412MDMS
REMOTE SENSOR: F145-1378 (OUTDOOR), F145-1328 (INDOOR)
3
WIRING DIAGRAM
Figure 5 – Two Stage
DHM
HM
Relay
90-290Q
or equivalent
ODD
V
THERMOSTAT MODEL: (-)HC-TST412MDMS
REMOTE SENSOR: F145-1378 (OUTDOOR), F145-1328 (INDOOR)
Figure 6 – Typical Wiring for 120V Humidifi er System
R
24 VAC
NEUTRAL
HOT
120 VAC
Humidifier
HM
Humidifier
System
System
HOT
NEUTRAL
120 VAC
TRANSFORMER
(Refer to furnace instructions for humidity information)
Figure 7 – Typical Wiring for 24V Humidifi er System
R
24 VAC
NEUTRAL
TRANSFORMER
HOT
120 VAC
4
THERMOSTAT QUICK REFERENCE
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Home Screen Description
Figure 9 – Home Screen Display
Day of Week
Room
Temperature
Time of Day
System
Switch
Fan
Switch
Indicates when
thermostat is calling
for Heat or Cool
Programming and Confi guration Items
Displays and "Keypad Lockout" when in keypad
1
lockout mode.
Displays
Lockout" when limited range is activated and locked.
Displays only "Temperature Limit" when limited range
is activated.
2
Indicates period of day being programmed.
3
RUN SCHEDULE (run program) key.
SET TIME key or HOLD temperature key.
4
Displays "Change Filter"/"Change Pad"/"Change UV
Lamp" when the system has run for the programmed
fi lter/humidity pad/UV lamp time period as a reminder
to change or clean your fi lter/humidity pad or to replace
UV lamp.
COPY key or INSTALLER CONFIG key.
CLEAN DISPLAY key allows 30 seconds to wipe off the
display or ADVANCE DAY key for programming.
Used in programming to set time and in confi guration
menu to change selections.
"Hold Until" indicates the time when a temporary hold
period will end.
"Hours" and "Days" displays during steps in installer
confi guration.
The words "Hold At" are displayed when the thermo-
stat is in the HOLD mode. "Temporary Hold At" is
displayed when the thermostat is in a temporary HOLD
mode.
"Humidity" indicates that the "Set At" display is Hu-
midity setpoint.
"System On" indicates when heating or cooling stage
is energized. "+2" indicates when a second stage is
energized.
"Copy" indicates the copy program feature is being
used during programming.
and "Temperature Limit" and "Keypad
Set Temperature
Temperature
UP/Down used for
modifying set point
as well as to
navigating the menus
Enters comfort
temperature settings
into the schedule
Menu key for entering
different modes such as
Cleaning, Configuration, Set
Battery Level Indicator
Time and Set Schedule
Indicating the current power level
of the 2 “AA” batteries.
Full power remaining.
Half power remaining.
Change The batteries should be replaced at this time.
Figure 10 – Programming & Confi guration Items
16 17
123456789
1
011
11 12
10
1
1
1
1
171
1
516
3
4
2
2
2
222
2
2
021
8
9
272
3
6
5
4
82930
3
3
323
1
6
33435
9
8
18
14
13
15
19
7
6
4
5
A steady "Cool Savings" display indicates the feature
is enabled in the installer menu. A fl ashing "Cool Sav-
ings" display indicates the feature is active.
"Remote" indicates that the indoor remote temperature
sensor, is being accessed. "Outdoor Remote" indicates the outdoor remote temperature sensor is being
accessed.
Display time, remote temperature or humidity.
"Heat Pump" displays when the system confi guration
is set to HP1/HP2.
"Call for Service" indicates a fault in the heating/cooling
19
systems. It does not indicate a fault in the thermostat.
Auto Schedule key for Auto Schedule function.
20
373
839
1
2
20
3
5
INSTALLER/CONFIGURATION MENU
To enter the menu: Press the Menu touch key. Press and hold for 5 seconds the Installer Confi g touch key. When the key is
released the display will show menu item #1 in the table below. Press
previous menu item. Press
Menu
Reference
Number
Program-
mable
1 1 1 MS 2 HP 1, HP 2, SS 1 Selects Multi-Stage (MS 2, No Heat Pump), Heat Pump 1
222 (GAS) ELE GAS setting: furnace controls blower.
333 Days, (7) P 0 Programs per week. (5 = 5+1+1 day, 0 = non-programmable)
44NA
554 Cool-Off-
66NA E (On) OFF Selects Energy Management Recovery, E (with program-
775 Cr, Heat (FA) SL Selects Adjustable Anticipation, cycle rate, Heat
886
997
10 10 8 CL (OFF) On Selects Compressor Lockout.
11 11 9
12 12 10
13 13 11
14 14 12
15 15 13 b (On) OFF Selects audible Beeper On/Off.
16 16 14
17 17 15
18 18 16 AS, Cool
19 19 17 CS, (OFF)
20 20 18 HL, Heat (99) 62-98 TEMPERATURE LIMIT, HEAT (max. heat set point).
21 21 19
22 22 20
23 23 21 FS, Heat (On) OFF Fast second stage of heat (not available if SS1 is selected
24 24 22 FS, Cool (On) OFF Fast second stage of cool (not available if SS1 or HP1 is
25 25 23 Remote (OFF) On Remote temperature sensor, enable/disable.
26 26 24 dF (05) 5-50 Selects Dual Fuel setpoint (°F) with outdoor sensor avail-
or to change a menu item.
Non-
Program-
mable
Press
Button
Displayed
(Factory
Default)
Morning, Day,
Evening,
Heat-Auto
Cool-Off-
Em-Auto
Cr, Cool (FA) SL Selects Adjustable Anticipation, cycle rate, Cool
Cr/AU, Em
dL (On) OFF Selects Continuous Display backlight & intensity.
dL (LO) HI Selects Backlight Intensity.
dS (On) OFF Selects Daylight Saving Time calculation.
AS, Heat
Cool Savings
LL, Cool (45) 46-82 TEMPERATURE LIMIT, COOL (min. cool set point).
OFF,
Keypad
Lockout
In, Remote Outdoor Remote Remote temperature sensor (Indoor/Outdoor).
LS (On) OFF Local temp. Sensor enable/disable (only when Indoor Re-
Cd (15) 0-99 Selects compressor delay in seconds. (This appears if dF is
CONFIGURATION MENU
Press
to select from
listed options
PS (4)
Night
Off-Heat, Cool-Off
Heat-
(FA)
0 4, LO to 4, HI Selects Adjustable Ambient Temperature Display [range -4
°F °C Selects °F/°C Display (temperature units in Fahrenheit or
(OFF)
(OFF)
000 001-999 Selects Keypad Lockout Combination (active only if keypad
Cool-Off-Heat-Em,
Off-Heat-Em, Cool-
L (total), P (partial),
Temperature Limit
(limited temperature
2
Day, Night
Cool-Off-Heat,
Off
SL Selects Adjustable Anticipation, cycle rate auxiliary, (This
On Selects Automatic Schedule for comfort temperature Pro-
On Selects Automatic Schedule for comfort temperature Pro-
1-2-3-4-5-6 Selects Cool Saving Feature & amount.
range)
to advance to the next menu item or to return to a
or
Comments
(HP 1, 1 compressor), Heat Pump 2 (HP 2, 2 compressor
or 2 speed compressor), or Single Stage.
ELE setting: thermostat controls blower.
Program periods per day.
4 = Morning, Day, Evening, Night
2 = Day, Night
System switch confi guration in non heat pump mode.
System switch confi guration, heat pump mode.
ming option on)
item is only to appear if HP 1 or HP 2 is selected above).
(LO) to +4 (HI)].
Celsius).
gramming, heat mode.
gramming, cool mode.
Selects Keypad Lockout.
Lockout is selected).
above).
selected above).
mote is selected On).
able. (This item appears if HP of HP2 is selected and
outdoor sensor is installed and enabled.)
selected higher than 5.)
6
INSTALLER/CONFIGURATION MENU
27 27 25 AO (80) 79-35 Selects Auxiliary Heat cut out temperature. This item
28 28 26
29 29 27 Humidity
30 30 28
31 31 29
32 32 30
33 33 31
34 34 32
35 35 33 OFF
Hd (OFF) On Selects Humidity Display alternate with time.
H1, OD
Hr (OFF) LO, HI Selects Auto Humidity reduction.
AH (OFF) H, C, A Selects Automatic Humidifi cation.
OC (OFF) On Selects Optimum Comfort feature.
Change UV
Lamp (OFF)
350 Days 25-1975 Change UV Lamp duration days.
Change Pad
(OFF)
1000 Hrs 25-1975 Change Humidifi er Pad duration hours.
Change Filter
200 Hours 25-1975 Change Filter duration hours.
-20-20
-18
On Selects Change UV Lamp feature.
On Selects Change Humidifi er Pad feature.
On Selects Change Filter feature.
appears if HP1 or HP2 is selected and outdoor sensor is
installed and enabled.
Selects Humidity Display adjustment.
1. This control can be confi gured for:
MS2 – Multi-Stage System (2 heat/2 cool) default
HP1 – Heat Pump with one stage of compressor
(2 heat/1 cool)
HP2 – Heat Pump with two stage compressor or two
compressor system, Gas or Electric backup; (Dual Fuel
see menu item 35) (3 heat/2 cool)
SS1 – Single Stage System (3 wire zone see wiring
diagram 37-6809)
2. GAS or Electric (ELE) fan operation. If the heating
system requires the thermostat to energize the fan,
select ELE. Select GAS if the heating system energizes
the fan on a call for heat. Note: Resetting the thermostat
switches the option to .
3. Programs per week – This control can be confi gured for
7 independent day or 5/1/1 day programming or nonprogrammable modes. Default is 7-day mode. The display
indicates "7 Days" as default. Other options "5 Days" or "0
Days" can be selected by pressing touch keys,
or .
If "0 Days" is selected for non-programmable mode, the
step for EMR will be skipped, as this feature will not be
available in this mode.
4. Program Steps per day – This control can be confi gured
for 4 or 2 program steps per day. Default is "4 PS" and
can be toggled between 4 PS and 2 PS by pressing the
or touch keys.
5. System Switch Confi guration (MS2/SS1) – This ther-
mostat is confi gured for Heat and Cool with Auto changeover default (Cool-Off-Heat-Auto). Can be confi gured as
Heat & Cool (Cool-Off-Heat), or Heat Only (Off-Heat), or
Cool Only (Cool-Off). When the control is in heat pump
confi guration (HP1/HP2), the system switch confi guration
will have an additional mode available namely, Em for
Emergency Mode.
6. Energy Management Recovery (EMR) – (This step is
skipped if confi gured as non-programmable.) When set
to "On" causes the thermostat to start heating or cooling
early to make the building temperature reach the program
setpoint at the time you specify.
Example: The heating program is 65°F at night and 70°
at 7 AM. If the building temperature is 65°F, the difference
is 5°F. Allowing 5 minutes per °F rise, the thermostat setpoint will change to 70° at 6:35 AM. Cooling allows more
time per °F, because it takes longer to reach temperature.
7, 8 & 9. Cycle Rate Selection – The factory default setting
is fast cycle (FA Cr) in all modes (Heat, Cool, Em). To
slow cycling (SL, Cr), press touch keys
between FA & SL. The cycle rates are as below different
selections:
Mode Fast rate Slow rate
Heat 0.6°F 1.2°F
Cool 1.2°F 1.7°F
Em 1.2°F 1.7°F
10. Select Compressor Lockout (CL) – Selecting CL On will
cause the thermostat to wait 5 minutes between cooling
cycles. This is intended to help protect the compressor
from short cycling. Some of the newer compressors have
already got a time delay built in and do not require this
feature to be activated in the thermostat. Your compressor
manufacturer can tell you if this lockout feature is already
present in their system. When the thermostat compressor
time delay is activated, it will fl ash the set point for up to
fi ve minutes.
11. Select Continuous Backlight – In low lighting conditions, display backlight improves the display contrast.
When C terminal is connected, selecting dL On will turn
the backlight on continuously. Selecting dL Off will turn the
backlight on momentarily after any key is pressed. When
C terminal is not powered (battery only), dL On enables
the momentary backlight whenever a key is pressed.
12. Select Backlight Intensity – This thermostat has the
ability to provide two selectable intensities of the back
light: HI and LO. Using
or touch keys you can
toggle the selection between HI and LO.
13. Select Temperature Display Adjustment 4 LO to 4 HI
This allows you to adjust the room temperature display
by an amount in the range of -4°F to +4°F in 1° steps by
using the
or touch keys. Your thermostat was
or toggle
7
INSTALLER/CONFIGURATION MENU
accurately calibrated at the factory, however you have the
option to change the display temperature value to match
your previous thermostat, if you so prefer.
14. Select °F or °C Readout – Select the desired temperature unit by pressing
15. Select Audio Prompting (Beeper) On or Off – Factory
default setting is on (b, On). If you wish to turn off the
beeper select OFF.
16. Select Daylight Saving Time Calculation – This feature
will allow the thermostat to calculate the DST automatically and apply it to the Real Time Clock display. Default
On. Use
17 & 18. Select Automatic Schedule – With just one touch
of the Auto Schedule key this feature allows you to program a desired comfort temperature into all the program
periods along with a 6° set back for night periods of both
Heat and Cool programs. Factory default is "On" for both.
When Heat AS On and Cool AS On are activated while in
Heat or Cool mode, select desired setpoint temperature
and press Auto Schedule. Auto Schedule will fl ash, press
it again to copy. This value will be copied into all the morning, day and evening program periods. The night program
periods will be with a 6°F set back.
19. Select Cool Savings™: With Cool Savings™ enabled,
the thermostat will make small adjustments to the sensed
temperature during periods of high demand to reduce AC
system running time and save energy. When the cooling system has been running for more than 20 minutes,
humidity in the home will be lower and a higher temperature will feel comfortable. After 20 minutes of run time, the
thermostat will start decreasing the sensed temperature
in steps of less than one degree as the system continues
to run. These adjustments will eventually cause the system to satisfy the thermostat to turn the system off and reduce the energy consumption. When the Cool Savings™
feature is active and making adjustments, the display will
fl ash “CoolSavings”. The amount of the adjustments to
the sensed temperature is dependent on the Cool Savings™ value that is set, 1 being the least adjustment and
6 being the most adjustment. With this feature set to OFF,
no change will occur when the AC system is continuously
running during the periods of high demand. Periods of
high demand will normally occur during the late afternoon
and early evening on the hottest days of the summer. As
demand lessens the adjustments to sensed temperature
are reversed until sensed temperature returns to normal
and “CoolSavings” no longer fl ashes.
20. Heat Temperature Limit Range – This feature adjusts
the highest setpoint temperature for heat. The default setting is 99°F. It can be changed between 62°F and 98°F by
pressing the
will be displayed to the left of your setpoint temperature
when using this feature. The "Temperature Limit" icon
will fl ash if an attempt is made to adjust the temperature
beyond the range selected.
21. Cool Temperature Limit Range – This feature adjusts
the lowest setpoint temperature for cool. The default setting is 45°F. It can be changed between 46°F and 82°F by
pressing the
will be displayed to the left of your setpoint temperature
when using this feature. The "Temperature Limit" icon
or touch keys to select the feature, OFF.
or key. The "Temperature Limit" icon
or key. The "Temperature Limit" icon
or . Factory default is °F.
will fl ash if an attempt is made to adjust the temperature
beyond the range selected.
22. Keypad Lockout – This step allows you to select the type
of lockout or limited range security required. If no lockout
or limited range security is required, press
the menu.
Three security settings are available in this menu item.
Use the
Lockout selections are:
"Keypad Lockout" and "L" = Total Lockout. Total Lockout
locks all keys.
"Keypad Lockout" and "P" = Partial Lockout. Partial
Lock-out allows only the
your set temperature limits.
"Temperature Limit/Keypad Lockout" prevents chang-
ing the temperature limits in the Confi guration
Menu.
Keypad Lockout Combination Number Selection
Display will read "OFF" "Keypad Lockout".
Skip this step and continue through the confi guration
remainder of the menu items if you require an Air Filter
Change out indicator, UV Light indicator, or Humidifi er
Pad Change out indicator by pressing the
advance.
Return to this point when you are ready to start your
selected lock-out and continue by:
Pressing
Press
Pressing
combination number. Note: "000" is not a valid
combination choice.
Record the number you select for future use.
Press
select will start in 10 seconds. The system button will
remain active for 10 seconds to allow setting Heat, Off,
Cool or Auto.
23 & 24. Select Fast Second Stage ON or OFF – In the run
mode, with the fast Heat feature enabled (FA Heat On), if
the Heat setpoint temperature is manually raised by 3°F
(2°C) or more above the actual temperature using
second stage will energize immediately. With FA OFF,
second stage will not energize until the setpoint temperature is 1°F or more above actual temperature for more
than ten minutes. The Fast Cool feature (FA Cool) provides the same controls when the setpoint temperature is
lowered.
25. Select Remote Temperature Sensor – This control
allows one wired remote temperature sensor (indoor or
outdoor) be connected to it and indicates the measured
temperature in clock digits. This menu enables you to
select the remote sensor and also confi gure it as indoor
or outdoor temperature sensor. Factory default is off.
Select Remote On and Remote in (for indoor) or
Outdoor Remote.
Local Temperature Sensor disable – This is applicable
only when indoor remote temperature sensor is enabled.
Factory default is On LS. You can make it Off LS if you
or keys to select the lockout desired.
or keys to operate within
or keys to select ON.
. Display will read "000".
or keys to select your keypad lockout
to exit the menu. The security feature you
to advance
button to
the
8
INSTALLER/CONFIGURATION MENU
desire by using or touch keys. Then, only the
indoor remote temperature reading will be used for
control.
26. Select Dual Fuel Feature Using Outdoor Sensor (dF)
– This feature is applicable only in heat pump modes and
with an outdoor sensor installed and enabled in step 25.
The thermostat will use the outdoor sensor temperature
to determine when to switch to gas heat and shut down
the compressor.
Select DF setting (dF) – dF default is 5. Select the
setting for outdoor temperature in the range of 5
When the outdoor temperature goes below the selected
temperature, the gas heat will begin.
Select Compressor Delay (Cd) – If dF is selected
higher than 5, after the auxiliary heat is turned on, the
compressor(s) shut down is delayed for the time selected
(in seconds). This delay is factory set to 60, but can be set
in the range of 0 to 99.
27. Select Auxiliary Off (AO) – Select the temperature that
will inhibit the auxiliary heating stage. As long as the outdoor temperature is above the selected temperature, the
auxiliary heat will not turn on. The default setting is 60°,
but can be set in the range of 35 ° to 80°.
28. Humidity Display (Hd) – Selecting HD On enables the
display to alternately show the current time and the humidity. If HD is selected OFF, the display will not show the
humidity.
29. Adjustable Humidity Display – The display will show
the ambient humidity and 00 (default). The setting can
be changed from -20 and LO to 20 and HI. The displayed
humidity will change as the offset is changed. In Run
mode, the displayed humidity will be the ambient humidity
adjusted by the setting selected.
30. Auto Humidity Reduction (HR) – This feature automatically lowers humidity setting when the outside
temperature drops to prevent the interior windows/walls
from reaching the dew point where water condenses on
surfaces. This feature default is OFF. It can be changed
to select LO (low humidity reduction) or HI. To achieve
automatic humidity reduction, the thermostat lowers the
humidity when furnace cycles are long. When the outside
temperature rises, it increases humidity. "LO" indicates a
low amount of humidity reduction.
31. Automatic Humidifi cation (AH) – This feature if enabled
allows for humidifi cation independent of a call for heating
– useful in arid climates where addition humidifi cation in
heating and/or cooling is desired. If enabled, will energize
the humidifi er and circulator blower (“G” terminal and the
“HM” terminal) if the actual humidity is below the humidity set point. The display indicates AH. Pressing the
key will cycle the display from OFF to H (feature enabled
in Heat mode) to C (feature enabled in Cool mode) to A
(feature enabled to Auto mode) and back to OFF.
32. Programmable Dehumidifi cation Optimal Comfort
Mode (OC) – This item can be selected to OC (Optimal
Comfort mode), or OFF. When Optimal Comfort (OC) is
enabled, this feature automatically reduces indoor humidity with a call for Cooling if humidity is 2% above humidity
setpoint. Humidity is set by pressing the Humidity key
when in the appropriate mode, in this case Cooling, and
o
to 50o.
pressing the or keys to set desired humidity (range
40% to 95%) level followed by pressing Humidity key
again. This dehumidifi cation feature uses less energy by
maintaining temperature and dehumidifying only when a
call for Cooling is required.
33. Select Change UV Lamp Time – This feature allows
the thermostat to display the words "Change UV Lamp"
(Call for Service of UV bulb) after a set time of UV bulb
operation. This is a reminder to maintain your UV system
at optimum level of operation. When enabled, the factory
set interval for "Change UV Lamp" to be displayed is 350
days of UV bulb operation and can be set between 25 to
1975 days in 25 day increments. This should be adjusted
with respect to the bulb’s recommended maintenance
schedule.
When "Change UV Lamp" is displayed, you can clear it
by pressing Clean Display.
34. Select Change Humidifi er Pad Time – This feature al-
lows the thermostat to display the words "Change Pad"
after a set time of humidifi er operation. This is a reminder
to maintain or clean your humidifi er. The factory set
interval for "Change Pad" to be displayed is 200 hours of
humidifi er operation and can be set between 25 to 1975
hours in 25 hour increments. This should be adjusted with
respect to the humidifi er’s recommended maintenance
schedule.
When "Change Pad" is displayed, you can clear it by
pressing Clean Display.
35. Select Change Filter Run Time – This feature allows
thermostat to display "Change Filter" after a set time of
blower operation. This is a reminder to change or clean
your air fi lter. This time can be set from 25 to 1975 hours
in 25 hour increments. A selection of OFF will cancel this
feature. When "Change Filter" is displayed, you can
clear it by pressing Clean Display. In a typical application,
200 hours of run time is approximately 30 days.
9
OPERATING YOUR THERMOSTAT
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 qualifi ed 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. Press FAN key to ON position. The blower should begin
to operate.
3. Press FAN key to AUTO position. The blower should
stop immediately.
CAUTION
!
Do not allow the compressor to run unless the compressor oil heaters have been operational for 6 hours
and the system has not been operational for at least
5 minutes.
Heating/Humidifi er
1. Press SYSTEM key to select HEAT. If the auxiliary heating
system has a standing pilot, be sure to light it.
2. Press
temperature. The heat pump system should begin to operate.
The display should show "System On". However, if the system
confi guration is set to HP1 or HP2 and setpoint temperature
display is fl ashing, the 5 minute compressor lockout feature
is operating (see Confi guration menu, item 11).
3. Adjust temperature setting to 3° above room temperature.
If your system configuration is set at MS2, HP1 or HP2, the
auxiliary heat system should begin to operate and the display
will show "System On +2".
4. Press
The heating system should stop operating.
To check the humidifi er when System On appears and the
heating system is running press the *HUMIDITY button once.
Press
humidity level. Hum On will appear indicating it is calling for
the humidifi er.
*Note: If Auto Schedule is displayed instead of Humidity, Auto
Schedule must be turned off in the Confi guration Menu.
Emergency Mode
Applies only to Heat Pump Systems
Emergency Heat (System EM Position) bypasses the Heat
Pump to use the heat source wired to terminal W/E, W2 on
the thermostat. EM is typically used when compressor operation is not desired, or you prefer back-up heat only.
1. Press SYSTEM key to select EM. “EM Heat Mode” will
fl ash on the display.
2. Press
perature. The Emergency heating system will begin to
operate. The display will show “System On” fl ashing “EM
Heat Mode” and “Heat” to indicate that the Emergency system is operating.
to adjust thermostat setting to 1° above the room
to adjust the thermostat below room temperature.
to adjust the humidity 2% or more above the room
to adjust thermostat setting above room tem-
3. Adjust temperature setting to 3° above room temperature. Any
additional stages of auxiliary heat should begin to operate
and the display will show "System On +2".
4. Press
The heating system should stop operating.
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
to adjust the thermostat below room temperature.
CAUTION
!
Cooling/Dehumidifi er
1. Press SYSTEM to select COOL.
2. Press
perature. The blower should come on immediately on high
speed, followed by cold air circulation. The display should
show "System On". If the setpoint temperature display is
fl ashing, the compressor lockout feature is operating (see
Confi guration menu, item 5).
3. Adjust temperature setting to 3° below room temperature.
The second stage cooling should begin to operate and the
display should show "System On +2".
4. Press
temperature. The cooling system should stop operating.
To check the dehumidifi er when "System On" appears and
the cooling system is running press *HUMIDITY button once.
Press
humidity level. "DeHum On" will appear indicating it is calling
for the dehumidifi cation.
If the room humidity is lower than the adjustment range, press
to 40% and hold it for four seconds. This will force the "DeHum
On" for one complete cooling cycle to test the dehumidifi cation
equipment.
After adjusting the humidity setting the display will return to
temperature in approximately 10 seconds. To switch the display
back to temperature immediately after adjusting humidity setting
press HUMIDITY again.
*Note: If Auto Schedule is displayed instead of Humidity, Auto
Schedule must be turned off in the Confi guration Menu.
to adjust the thermostat setting below room tem-
to adjust the temperature setting above room
to adjust the humidity 2% or more below the room
Choose the Fan Setting (Auto or On or Prog)
There are three fan features on the (-)HC-TST412MDMS:
1. Fan Auto/On – Traditional Fan Settings
Press Fan to select Auto or On. The most commonly
used setting is Auto. Fan Auto runs the fan only when
the heating or cooling system is operating. Selecting Fan
On runs the fan continuously for increased air circulation
or to allow additional air cleaning if the system is equipped
with an Electronic Air Cleaner.
2. FAN Prog – Comfort Circulating Fan Feature
Pressing FAN until FAN Prog appears activates the Com-
fort Circulating Fan Option. This causes the thermostat to
cycle the fan on for 10 minutes and off for 20 minutes if the
thermostat has not called for heat or cool during the past
60 minutes. This assures moderate air circulation even
when the heating and cooling equipment is not cycling.
10
OPERATING YOUR THERMOSTAT IMPORTANT!
3. FAN On Prog. – Programmable Fan
FAN On Prog indicates that a time period has FAN Prog
selected in the Set Schedule mode (see Programmable
Fan Option). The fan will run continuously through the
period until the next period begins. To override FAN On
Prog, press the FAN key to select Auto for the fan to run
only when the heating or cooling system is operating.
Tip: Running the fan more frequently will increase your
energy consumption. Most systems use a 1/2 or 1/3 HP
electric motor to power the fan.
Choose the System Setting
(Cool, Off, Heat, Em, Auto)
Press the SYSTEM button to select:
Cool: Thermostat controls only the cooling system.
Off: Heating and Cooling systems are off.
Heat: Thermostat controls only the heating system.
Em: Setting is available only when the thermostat is confi g-
ured in HP1 or HP2 mode.
Auto: Auto Changeover is used in areas where both heating
and cooling may be required on the same day. AUTO allows
the thermostat to automatically select heating or cooling
depending on the indoor temperature and the selected heat
and cool temperatures. When using AUTO, be sure to set the
Cooling temperatures more than 1° Fahrenheit higher than
the heating temperature.
Manual Operation for
Non-Programmable Mode Thermostats
Press the SYSTEM button to select Heat or Cool and use the
or buttons to adjust the temperature to your desired
setting. After selecting your desired settings you can also
press the SYSTEM button to select AUTO to allow the ther-
mostat to automatically change between Heat and Cool.
Manual Operation (Bypassing the Program)
Programmable Thermostats
Press or and the HOLD button and adjust the temperature wherever you like. This will override the program. The
HOLD feature bypasses the program and allows you to adjust
the temperature manually, as needed. Whatever temperature
you set in HOLD will be maintained 24 hours a day, until you
manually change the temperature or press Run Schedule to
cancel HOLD and resume the programmed schedule.
Program Override (Temporary Override)
Press or buttons to adjust the temperature. This will
override the temperature setting for a (default) four hour override period. The override period can be shortened by pressing
or lengthened by pressing . Program Override period
can range from 15 minutes to 7 days.
Example: If you turn up the heat during the morning program, it will be automatically lowered later, when the temporary hold period ends. To cancel the temporary setting at any
time and return to the program, press Run Schedule.
If the SYSTEM button is pressed to select AUTO the thermostat will change to Heat or Cool, whichever ran last. If it
switches to heat but you want cool, or it changes to cool but
you want heat, press both
change to the other mode.
or buttons simultaneously to
Special Test Mode for PWM (V) output
(Installer function only)
The PWM (V) output controls the modulating gas valve. Amplitude of this signal is about 10 VDC, frequency is 1 HZ and
the pulse width is variable 350 to 950 in steps of 50 msec.
To activate the modulating test mode, press and hold the Installer Confi g touch key until the display changes to show dC
(in actual temperature digits) and 05 (default) in clock digits
(at least 10 seconds). If the touch key is released before the
display changes the test mode will not be activated and the
installer menu mode will be active. On entering the modulating test mode, the display (05) will indicate the duty cycle of
5% (pulse width of 50 msec) corresponding to no call for heat.
Press
The W output will energize and within one second the pulse
width modulated V output will also be activated with a pulse
width of 350 msec.
Use
width in steps of 50 milliseconds (5% change in duty cycle).
The maximum duty cycle is 95% (maximum pulse width of
950 milliseconds).
This special test mode will be exited by pressing Run Schedule touch key or when there is no keypad activity for over 60
minutes.
key to change the display to 35 (duty cycle 35%).
or touch keys to increase or decrease the pulse
Set Current Time and Day
1. Press Menu key to enter installer menu. Then press
Set Time once to indicate hour & A or P designation in
clock display.
2. Press and hold either the
reach the correct hour and A or P designation.
3. Press Set Time again to display minutes only in clock
display.
4. Press and hold either the
reach the correct minutes.
5. Press Set Time once again to display year.
6. Press and hold either the
reach the correct year.
7. Press Set Time once again to display month.
8. Press and hold either the
reach the correct month.
9. Press Set Time once again to display date of the month
along with day of the week at top row (which is automatic).
10. Press and hold either the
reach the correct day of the month. The correct day of
the week is displayed at the top row.
11. Press Run Schedule once; now the display will show the
correct time and room temperature.
or touch key until you
or touch keys until you
or touch key until you
or touch key until you
or touch key until you
11
PROGRAMMING
Automatic Daylight Saving Calculation
The Real Time Clock will adjust automatically for daylight savings time in the following manner:
Increment one hour at 2 AM on the second Sunday of March
and decrement one hour at 2 AM on the fi rst Sunday of November.
The daylight saving feature can be enabled or disabled in installer
confi guration mode.
After entering installer confi guration mode, momentarily press
or touch key until the display indicates dS (in actual tem-
perature digits) and on (default – in clock digits).
and keys will toggle display and operation from On to
OFF.
Programming Tip: Copy Program
When programming your thermostat, you may copy the program
from one day to another day or group of days using the Copy
key. In 7 day programming mode, a day can be copied to another
day or all six other days. In 5/1/1 day programming mode the
weekday (Mon – Fri) program can be copied into Sat and Sun
or either Sat or Sun.
To copy a program from one day to another:
1. In Set Schedule mode, enter the program for the day or
select the day you wish to copy by pressing Advance Day.
2. Press Copy. The display will show “Copy” next to the
SYSTEM key and the day of the week that will be copied.
3. Press Advance Day. The day being copied will be indi-
cated and the other days will be fl ashing.
4. If you wish to copy to all days skip to next step or press
Advance Day until the day you wish to copy to is fl ashing.
5. Press Copy. “Copy” will disappear, the day you copied
from will disappear and the day(s) you copied to will be on.
6. If you wish to copy this same program into other days,
press Copy and repeat steps 3, 4 and 5.
7. Press Run Schedule to return to normal operation.
Fill in the blank schedule on the next page then:
Enter the Heating Program
1. Press the Menu button and then press Set Schedule.
Press SYSTEM button to select either "Heat" or "Cool" in
the system switch area indicating the active mode being
programmed. You can switch to the other mode by pressing
the system switch at any time.
2. The top of the display will show the day(s) being programmed.
The time and set at temperature are also displayed. "Morning" will also be displayed to indicate the period.
3. Press
selected temperature for the 1st heating period (Morning).
4. Press
The time will change in 15 minute increments.
5. Press FAN to select Auto or Prog.
6. After you have set the time and the temperature for the
period to begin, press Set Schedule to advance to the
next program period.
7. Repeat steps 2 through 6 until all of the program times
and temperatures are set for all program periods on that
day.
8. Press "Advance Day" to change to the next day and
repeat steps 2 through 8.
9. When programming is complete and all of the times and
temperatures match your desired heating schedule, press
Run Schedule. The thermostat will now run your program.
or key to change the temperature to your
or key to adjust the start time for period.
Enter the Cooling Program
1. Press the SYSTEM button until the Cool icon appears.
2. Follow Enter Heating Program instructions for entering
cooling times and temperatures.
Automatic Schedule
Auto Schedule Heat is a fast way to program all the heating temperatures during the day to a comfortable temperature and then
lower the temperature 6° at night. Auto Schedule Cool will program
all of the cooling time periods to the same temperature.
Note: Auto Schedule is available only when the thermostat is
fi rst powered on, after the thermostat has been reset, or anytime
you turn AS on in the Confi guration Menu (item 18 AS Heat or
19 AS Cool). After use in heating and cooling, Auto Schedule
on the display will change to Humidity.
Heating Example:
1. In Heat mode, press Auto Schedule once.
2. Press
ture (example 72°).
3. Press Auto Schedule again. Your thermostat is now pro-
grammed for 72° from 6:30 AM until 10:30 PM at 72°. At
10:30 PM, your thermostat will set back 6° to 66°.
Your heating program for each day of the week will look like
this:
6:30 72°
8:00 72°
5:00 72°
10:30 66°
Cooling Example:
1. In cool, press Auto Schedule once.
2. Press
ture (example 75°).
3. Press Auto Schedule again. Your thermostat is now pro-
grammed for 75° for all cooling time periods.
Your cooling program for each day of the week will look like
this:
6:30 75°
8:00 75°
5:00 75°
10:30 75°
or to select a comfortable day time tempera-
or to select a comfortable cooling tempera-
Programmable Fan Option
In the Set Schedule (programming mode) pressing Fan will
alternate the fan setting between FAN Auto and FAN Prog.
FAN Auto runs the fan as needed with the heating or cooling.
FAN Prog programs the fan to run continuously for the heating
or cooling time period you are programming.
Example: Press the SYSTEM key to select Heat.
Press the Menu key once to display Set Schedule.
Press Set Schedule once to display the 1st heating program
period. The time and temperature for this period will show on
the display. Press the FAN key until it displays FAN Prog. The
fan is now programmed to run continuously for this time period. The fan can be programmed for any or all time and temperature settings in heating and cooling. To cancel program
fan for a time period, enter the heating or cooling program
(Menu, Set Schedule) and advance to the time/temperature
period you want to cancel. Press the fan key and FAN Prog
will change to FAN Auto.
12
PROGRAMMING
Energy Saving Factory Pre-Program
The (-)HC-TST412MDMS thermostats are programmed with the energy saving settings shown in the table below for all days of
the week. If this program suits your needs, simply set the thermostat clock and press the RUN button.
The table below shows the factory set heating and cooling schedule for all days of the week.
* Wake Up Leave For Work * Return Home Go To Bed
(Morning) (Day) (Evening) (Night)
Heating
6:00 AM 70°F 8:00 AM 62°F 5:00 PM 70°F 10:00 PM 62°F
Program
Cooling
6:00 AM 78°F 8:00 AM 85°F 5:00 PM 78°F 10:00 PM 82°F
Program
* You can eliminate these two program periods in the confi guration menu (reference #3) if the building is occupied all day.
Day will change to 6:00 am and can be programmed as required.
Planning Your Program – Important
The Heating and Cooling Program schedules below allow you to pencil in your own program times and temperatures.
The (-)HC-TST412MDMS comes confi gured for 7 day programming and can also be confi gured for 5+1+1 programming (see
confi guration section).
Factory settings are listed on Monday, Saturday and Sunday. If you are re-programming a 5+1+1 day schedule, pencil in your
own times and temperatures directly below the factory times and temperatures.
If you are re-programming a 7 day fi ll in all lines with the times and temperatures you want.
Keep the following guidelines in mind when planning your program.
• In Heating, lower temperatures will save energy.
• In Cooling, higher temperatures will save energy.
• If you plan on using Auto Changeover, do not program the heating higher than the cooling.
Worksheet for Re-Programming 5+1+1 and 7 Day Program
Heating
Program
MON
TUE
WED
THU
FRI
SAT
SUN
Cooling
Program
MON
TUE
WED
THU
FRI
SAT
Wake Up
(Morning)
6:00 AM 70°F Auto 8:00 AM 62°F Auto 5:00 PM 70°F Auto 10:00 PM 62°F Auto
6:00 AM 70°F Auto 8:00 AM 62°F Auto 5:00 PM 70°F Auto 10:00 PM 62°F Auto
6:00 AM 70°F Auto 8:00 AM 62°F Auto 5:00 PM 70°F Auto 10:00 PM 62°F Auto
Wake Up
(Morning)
6:00 AM 75°F Auto 8:00 AM 83°F Auto 5:00 PM 75°F Auto 10:00 PM 78°F Auto
6:00 AM 75°F Auto 8:00 AM 83°F Auto 5:00 PM 75°F Auto 10:00 PM 78°F Auto
Leave For Work
Fan
vvv
Leave For Work
Fan
(Day)
(Day)
Fan
Fan
Return Home
(Evening)
Return Home
(Evening)
Fan
Fan
Go To Bed
(Night)
Go To Bed
(Night)
Fan
Fan
SUN
6:00 AM 75°F Auto 8:00 AM 83°F Auto 5:00 PM 75°F Auto 10:00 PM 78°F Auto
13
PROGRAMMING
Wired Remote Temperature Sensing
One remote temperature sensor can be installed indoor or
outdoor and connected to the thermostat by a maximum
cable length of 100 meters (300 feet). Terminals +, S and - on
the terminal block allow connection of the remote sensor.
The thermostat must have 24 VAC Common connection to
terminal C for the remote sensor to operate. The remote sensor can be enabled or disabled in the Installer/Confi guration
menu, item 25.
When remote sensor, Remote, is selected Off (factory default), no remote sensor is enabled. When remote sensor is
selected On, the next step is to select the remote as indoor,
Remote In, or outdoor, Remote Outdoor. If the remote is selected as Remote In, an additional step will be to select if the
temperature shown on the display will be from the thermostat,
LS On, or the remote sensor Ls Off.
In normal operation, when a remote sensor is enabled the
time digits of the display will alternate between the time and
the remote temperature for three seconds each. Above the
remote temperature will be Remote, for indoor sensor or
Outdoor Remote, for outdoor sensor. If the remote sensor is
an indoor sensor and the local display has been disabled, the
temperature displayed as the room temperature will be the
remote sensor temperature.
Sensing Range:
Outdoor temperature range is -40 to 140
Indoor temperature range is 32
o
F to 99 oF
o
F
Weight of Remote Reading
The thermostat is designed to receive the temperature of
the indoor remote sensor and average, or weight, it with the
local sensor in the thermostat for each program period. The
averaging will be active only when the local sensor and the
indoor remote sensor are both functional and enabled in the
Installer/Confi guration menu.
When the thermostat is in the Set Schedule mode, the weight
of the indoor sensor will be shown in the current temperature
digits of the display. The weight will show as A2 (average and
default), H4 (high) or L1 (low). Pressing the
the same time will change the weight for the program period.
The weight of the local sensor is fi xed.
In normal operation of the thermostat, the current temperature displayed will be the weighted average of the local
sensor and the remote sensor using the formula (local sensor
weight x local sensor temperature) + (remote sensor weight x
remote sensor temperature) / (local sensor weight + remote
sensor weight).
Example: Local sensor temperature is 80° and the remote
sensor is 70°.
If weight is selected H4, the averaged temperature of 72° will
be displayed.
(1 x 80) + (4 x 70) / 5 = 72°
If weight is selected A2, the average temperature of 73° will
be displayed.
(1 x 80) + (2 x 70) / 3 = 73.3°
If weight is selected L1, the average temperature of 75° will
be displayed.
(1 x 80) + (1 x 70) / 2 = 75°
and keys at
The example shows that the weight selected would prioritize
the overall averaged temperature between the two sensors.
The high weight selection caused the remote sensor to have
a higher infl uence in the calculated temperature average than
the local sensor and the low weight selection caused the
remote sensor to have less infl uence.
Call for Service Indicator
"Call for Service" indicates a compressor fault. "Call for "Service" will be on continuously when the L terminal is energized.
"Call for Service" will fl ash at the same rate as the L terminal
input signal, indicating a fault code.
Dual Fuel Temperature Setpoint
When the thermostat is confi gured for Heat Pump mode and
an outside remote sensor is installed, the thermostat can
monitor the outside temperature. When the outside temperature falls below a user selectable temperature, the thermostat
will switch to gas heat and shut down the compressor. This
eliminates the need for a fossil fuel kit.
The user selectable temperature is called the dual fuel temperature setpoint, dF and is set in the Installer/Confi guration
menu, item 26. The dual fuel temperature setpoint can be
set to a temperature of 5 through 50. A selection of 5 (default
setting) disables this feature and menu selection of Cd will not
be available.
After the dual fuel temperature setpoint is set above 5 and
is pressed, a delay, Cd, can be set for compressor shutdown
after the auxiliary stage is energized. This delay can be set
from 0 seconds to 99 seconds to minimize the time that the
system may blow cooler air until the alternate source of heat
comes on. Default setting for delay is 60. When setting the
delay if the
will increase or decrease at the rate of one degree every half
second for the fi rst three seconds and double the speed after
three seconds.
or keys are held depressed, the setpoint
Dual Fuel Settings
Menu Reference Options Setting
1 HP1 or HP2 HP1 or HP2
25 Remote ON
Outdoor Remote
26 DF 5-50 Selectable
27 AO 35-80 Selectable
14
TROUBLESHOOTING
Reset Operation
Note: When thermostat is reset, installer confi guration menu settings and programming will reset to factory settings.
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the thermostat by removing
the wires from terminals R and C (do not short them together) and removing batteries for 2 minutes. After resetting the thermostat, replace the
wires and batteries. If the thermostat has been reset and still does not function correctly contact your heating/cooling service person or place
of purchase.
Note: Be sure to review the installer confi guration menu settings.
To reset the programming, clock and confi guration settings, press
go blank and then all segments will be displayed momentarily.
Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan
(common problems)
No Heat 1. Pilot light not lit.
No Cool
Heat, Cool or Fan
Runs Constantly
Thermostat Setting &
Thermostat Thermometer
Disagree
Furnace (Air Conditioner)
Cycles Too Fast or Too Slow
(narrow or wide
temperature swing)
Forgot Keypad
Lockout Code
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
4. Loose connection to thermostat or system.
2. Furnace Lock-Out Condition. Heat
may also be intermittent.
3. Heating system requires service or
thermostat requires replacement.
1. Cooling system requires service or
thermostat requires replacement.
1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in heat/cool/fan system.
4. FAN Switch set to Fan ON.
1. Thermostat thermometer setting
requires adjustment.
1. The location of the thermostat and/or
the size of the Heating System may
be infl uencing the cycle rate.
and and the SYSTEM button simultaneously. The thermostat should
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety interlock or door switch.
Tighten connections.
Re-light pilot.
Many furnaces have safety devices that shut down when a
lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local HVAC service person
for assistance.
Diagnostic: Set SYSTEM Switch to HEAT and raise the
setpoint above room temperature. Within a few seconds the
thermostat should make a soft click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation listed above. If
the thermostat does not click after being reset contact your
heating and cooling service person or place of purchase for
a replacement. If the thermostat clicks, contact the furnace
manufacturer or a HVAC service person to verify the heating
is operating correctly.
Same as diagnostic for No Heat condition except set the
thermostat to COOL and lower the setpoint below the room
temperature. There may be up to a fi ve minute delay before
the thermostat clicks in Cooling.
Check each wire connection to verify they are not shorted or
touching together. No bare wire should stick out from under
terminal block. Try resetting the thermostat as described
above. If the condition persists the manufacturer of your
system or service person can instruct you on how to test the
Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat.
The thermometer can be adjusted +/- 4 degrees. See
Temperature Display Adjustment in the Confi guration Menu
section.
Digital thermostats provide precise control and cycle faster
than older mechanical models. The system turns on and off
more frequently but runs for a shorter time so there is no
increase in energy use. If you would like an increased cycle
time, choose SL for slow cycle in the Confi guration menu,
step 6 (heat) or 7 (cool). If an acceptable cycle rate is not
achieved, contact a local HVAC service person for additional
suggestions.
Press the menu button (button will disappear) and hold in for
20 seconds. This unlocks the thermostat.
1F95M-1296,-1297
15
HOMEOWNER HELP LINE: 1-800-284-2925
Loading...