Honeywell T8635L User Manual
T8635L Microelectronic Communicating
Programmable Thermostat
USER’S GUIDE
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CONTENTS
USING THIS GUIDE .......................................................................................................................................... 5
FEATURES ........................................................................................................................................................ 6
KEYBOARD AND DISPLAY DESCRIPTION .................................................................................................... 7
Keyboard ............................................................................................................................................................ 7
Display ............................................................................................................................................................... 7
ADAPTIVE INTELLIGENT RECOVERY™ CONTROL ..................................................................................... 10
Optimum Comfort and Energy Savings……………………………………………………………………………….. 11
OPERATING YOUR THERMOSTAT ................................................................................................................. 13
Setting System and Fan Keys ............................................................................................................................ 13
Setting the System Key .................................................................................................................................. 14
Setting the Fan Key ........................................................................................................................................ 14
Setting Temporary Temperatures ....................................................................................................................... 15
Changing Temperature to Temporary Setting Until Next Schedule Period .................................................... 15
Changing and Holding Temperature Setting Indefinitely ................................................................................ 17
Changing Temperature Setting Until a Designated Day and Period (Vacation Hold) ..................................... 18
Using the (Information) Key ......................................................................................................................... 21
Displaying Outdoor Temperature .................................................................................................................... 21
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Contents (Cont)
Displaying Current Settings ............................................................................................................................ 22
Filter Indicator .................................................................................................................................................... 23
Setting or Resetting Filter Indicator ................................................................................................................ 23
LED Indicators ................................................................................................................................................... 25
Remote Override Temperature Indicator ............................................................................................................ 25
SETTING THE CLOCK...................................................................................................................................... 26
Set Current Day and Time ................................................................................................................................. 26
Daylight Saving Time ......................................................................................................................................... 28
PROGRAMMING YOUR THERMOSTAT .......................................................................................................... 29
7-Day Program and Operation ........................................................................................................................... 29
7-Day Preprogrammed Schedule ................................................................................................................... 30
Customizing Your Own 7-Day Schedule ........................................................................................................ 31
Programming the First Day ............................................................................................................................ 32
Copying a Day ................................................................................................................................................ 37
Clearing a Program Period ............................................................................................................................. 40
TROUBLESHOOTING....................................................................................................................................... 42
WARRANTY ...................................................................................................................................................... 45
CUSTOMER ASSISTANCE ............................................................................................................................... 47
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USING THIS GUIDE
The T8635L is a multi-functional thermostat. This means it can be used in several different ways such as single
or multi-zone applications, conventional furnaces or heat pump equipment.
The following symbols will help you identify the features that apply to your system:
– Triple layer of thermostats with the word, zoning, below. These features are available when more
than one thermostat is connected and used with the optional W8703 Damper Interface Module.
ZONING
– Compressor with the word, heat pump, below. These features are available when used with a heat
pump with auxiliary heat.
HEAT PUMP
–Tip symbol. Look for helpful tips throughout the guide when you see this symbol.
80
70
90
60
60
90
70
80
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FEATURES
• Adaptive Intelligent Recovery™ Control for comfort
and energy savings.
• Customize the program schedule—program your
own schedule to fit your needs.
•Temporary schedule override—set the thermostat
higher or lower for the current program schedule.
• Permanent schedule override—set the thermostat
higher or lower indefinitely.
•Vacation mode (1 to 255 days) for added comfort
and energy savings. Set the temperature higher or
lower for energy savings while on vacation. At the
same time, set the comfort level you want when
you return.
• Set the filter indicator (0, 15, 30, 60, 90, or
120 days) to remind you to change the filter.
• Information at the press of a button—use the
(information) key to see the outdoor temperature (C7089B Outdoor Temperature Sensor
optional accessory), the current setpoints, or
the filter status.
• No batteries needed—your thermostat retains the
schedule for the life of the product. You never have
to reprogram the schedule even after a power
outage. (You may need to reset the day and time
after an extended power outage.)
• Daylight Time key for quick time changes between
Daylight and Standard time.
• Backlit display for improved readability—set the
backlight feature for backlighting on demand
(press any key to activate) or continual backlighting. Ask your installer to program this feature.
• Optional outdoor temperature display—ask your
installer to install an outdoor temperature sensor to
activate this feature.
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KEYBOARD AND DISPLAY DESCRIPTION
Keyboard
The keyboard is located behind the thermostat cover. Three frequently used keys, increase ▲ or decrease ▼
and , are located next to the display. See Fig. 1.
Display
The thermostat displays important information such as day, time, schedule period, temperature, filter information,
system and fan operation. See Fig. 2.
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TIME / TIME
SETS TIME
FORWARD OR BACK
SET CURRENT
DAY/TIME
SETS CURRENT
DAY AND TIME
RUN PROGRAM
RETURNS THERMOSTAT TO
NORMALOPERATING MODE
DAY
SETS DAY OF THE WEEK
HOLD TEMP
SETS A HOLDTEMPERATURE
SETTING AND ACTIVATES
VACATION HOLD FEATURE
DAYLIGHT TIME
SELECTS STANDARD TIME
OR DAYLIGHT SAVING TIME
COPY
COPIES SETTINGS FROM ONE DAY TO
ANOTHER DAY FOR QUICKPROGRAMMING
M17459
WAKE
SET WAKE TIMES
TEMPERATURES
Run
Program
Hold Temp
AND
Set Current
Day/Time
Day
Daylight
Time
LEAVE
SET LEAVE TIMES
TEMPERATURES
Time
Copy
HEAT/COOL SETTINGS
SWITCHES BETWEEN HEAT SETPOINTS AND
COOL SETPOINTS WHILE PROGRAMMING
Wake
Heat/Cool
Settings
AND
Leave
Filter
Set Program
DIGITAL
DISPLAY
Return Sleep
System
Fan
Fig. 1. Thermostat keyboard description.
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INCREASE
RAISES TEMPERATURE SETTING
DECREASE
LOWERS TEMPERATURE SETTING
INFORMATION
DISPLAYS CURRENT HEAT/COOL
TEMPERATURE SETTING
RETURN
SET RETURN TIMES
TEMPERATURES
SLEEP
SET SLEEP TIMES
TEMPERATURES
PROGRAM SCHEDULING
WAKE LEAVE RETURN SLEEP
ENTERS PROGRAMMING MODE
FAN
SELECTS AUTO/ON
SYSTEM
SELECTS HEAT/OFF/COOL (AUTO)
FILTER
SELECTS FILTER TIMER REMINDER
PERIOD (0, 15, 30, 60, 90, 120 DAYS)
AND
AND
SHOWS THERMOSTAT IS
PROCESSING INFORMATION
AND WAITING TO CALL FOR
HEAT OR COOL
SHOWS SMART
RESPONSE IS CHANGING
THE TEMPERATURE
TO MEET THE
CURRENT PROGRAM
SHOWS VACATION
HOLD DURATION
SHOWS FILTER TIMER
EXPIRED (TIME TO
REPLACE FILTER)
SHOWS CURRENT
DAY OR DAYS BEING
PROGRAMMED
SHOWS CURRENT
PROGRAM PERIOD
OR PERIOD BEING
PROGRAMMED
SHOWS WHEN
THERMOSTAT
IS IN THE
PROGRAMMING
MODE
Set Program
Wait
Set Day/Time
Recovery
Hold for
Filter Days
Mon
TueWedThuFriSatSun
Leave Return Sleep
Wake
SHOWS SYSTEM ON
DAYLIGHT SAVING TIME
SHOWS
DISPLAYS
EITHER CURRENT
TIME OF DAY OR
PROGRAM TIMES
TEMPERATURE
DISPLAYED IS THE
CURRENT ROOM
TEMPERATURE
Fig. 2. Example of thermostat display.
SHOWS
THERMOSTAT
IS IN THE
SET CURRENT
DAY/TIME MODE
Temporary Setting
AM
DST
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SHOWS
TEMPERATURE
SETTING CHANGED
FOR THIS
PROGRAM
PERIOD
Room
SHOWS SMART
RESPONSE IS OFF
AND CONVENTIONAL
RECOVERY IS ON
DISPLAYS EITHER ROOM
OR SET TEMPERATURE
System
Heat
Em
Off
Cool
Auto
Fan
On
Auto
SHOWS THERMOSTAT IS
CALLING FOR THE FAN
SHOWS THERMOSTAT
TEMPERATURE IS
BEING SET REMOTELY
SHOWS TEMPERATURE
DISPLAYED IS THE CURRENT
SET TEMPERATURE
SHOWS THAT THERMOSTAT
IS CALLING FOR
HEAT OR COOL
SHOWS CURRENT
SYSTEM KEY POSITION
HEAT/OFF/COOL
SHOWS CURRENT FAN
KEY POSITION ON/AUTO
M17756
ADAPTIVE INTELLIGENT
RECOVERY™ CONTROL
Your new thermostat is so smart, it’s almost human.
You perceive temperature from a variety of sources,
not only from the air in the room, but also from your
surrounding walls, windows and furnishings. Humans
feel differences in temperature as slight as two
degrees Fahrenheit. Common household thermometers and standard thermostats sense only air temperature, which may not reflect how hot or cold the
room actually feels to you. Your new thermostat reads
both the temperature of the wall and in the air, and
responds to temperature changes as little as one
degree Fahrenheit, so room temperature is more
likely to feel right to you and your family.
The thermostat acts like a computer. When calculating the time to turn on your heating or cooling system,
it considers air temperature, wall temperature, and the
time you want to reach the comfort temperature. After
considering these three things, Adaptive Intelligent
Recovery™ control gradually changes the temperature from the energy savings setting to the comfort
setting (for example, from a heating temperature of
62° at night to 70° in the morning).
The system runs continuously until the comfort
temperature you choose is reached without overshooting the setting. This saves energy. How do you
know when the system is in recovery? The thermostat
displays “Recovery” whenever the thermostat
activates Adaptive Intelligent Recovery™ control. See
Fig. 3. So, “Recovery” displays during the recovery
time from Sleep to Wake and from Leave to Return.
System
Recovery
Mon
Sleep
AM
Room
Heat
Em Heat
Fan
Auto
M14561
Fig. 3. Example of “Recovery” indication.
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After installation or new schedule programming, your
thermostat learns from experience. Each day it
checks how closely it hit the recovery target (for
example, 70° at 6:00 AM) and adjusts the next day’s
recovery start time accordingly. After four to eight
days, the thermostat has adjusted to local weather,
your lifestyle, the construction of your home, and your
heating and cooling system.
Optimum Comfort and Energy Savings
In Fig. 4, Adaptive Intelligent Recovery™ control
starts to recover at 5:00 AM and reaches the comfort
temperature of 68° at 6:30 AM. Recovery time varies
with the starting temperature and the comfort temperature you choose.
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At 7:00 AM System
TEMPERATURE
At 4:00 AM
Recovery Begins
Recovery
Mon
ENERGY
SAVINGS
PERIOD
Operating in Comfort Mode
At 6:00 AM
Recovery
Continues
AM
Recovery
At 5:00 AM
Recovery
Continues
AM
Recovery
Mon
System
AM
Sleep
Heat
Fan
Room
Auto
Room
Sleep
Mon
Sleep
System
Heat
Fan
Auto
1
Mon
Wake
System
Heat
Fan
Room
Auto
RECOVERY FROM ENERGY SAVINGS
TIME
AM
Room
COMFORT
PERIOD
System
Heat
Fan
Auto
THE THERMOSTAT USES THE SAME SCHEME TO RETURN GRADUALLY TO LOWER COMFORT TEMPERATURE DURING THE COOLING SEASON.
1
IF In Recovery IS DISPLAYED, PRESS TO SEE THE COMFORT SETPOINT.
M17758
Fig. 4. Explanation of Adaptive Intelligent Recovery™ control.
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OPERATING YOUR THERMOSTAT
Your new thermostat saves energy and keeps you
comfortable at the same time. By now you may be
wondering how to program your thermostat and how
to use some more time and energy-saving features.
First, let’s look at features you’ll be using often, like
setting the System and Fan keys, how to override the
current programming mode or to hold the thermostat
at a specific temperature while you go on vacation.
You can even program the thermostat to return to
your regular programming schedule on your last day
of vacation so you are comfortable when you return
and yet save energy while you are away.
Setting System and Fan Keys
Use the System and Fan keys to change the system
and fan settings. The fan settings can be set for each
schedule period individually. The system selection is
for all the schedule periods.
CAUTION
Equipment Damage Hazard.
Can cause permanent damage to the
compressor or other equipment.
To avoid possible compressor damage, allow
the compressor to remain off for five minutes
before restarting.
To avoid possible equipment damage, do not
operate cooling when the outside temperature
is below 50°F (10°C). See equipment manufacturer instructions.
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Setting the System Key
Press the System key until the desired
system (Heat, Off, Cool, or Auto) displays.
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes
between heating and cooling operation,
depending on the indoor temperature.
Auto is not available when used with zoning.
ZONING
Changing any thermostat system
setting on any thermostat automatically
changes the system setting in all zones. For example,
changing the zone 1 thermostat from Heat to Cool
causes all thermostats to change from Heat to Cool.
System
Em.Ht: Emergency heat is controlled as
stage 1 heat. Cooling system is off.
Compressor is de-energized. (Available
HEAT PUMP
only with multistage heat pump.)
Setting the Fan Key
Press Fan key until the desired mode
(On or Auto) displays:
On: Fan operates continuously.
Auto: Fan operates only when heating
or cooling.
displays when the thermostat is calling
for the fan in this zone. A flashing
indicates that the thermostat is waiting
ZONING
until another zone has completed its
call for heat or cool before initiating the fan call for
this zone.
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Fan
Setting Temporary Temperatures
You can override the current schedule period to temporarily change the temperature setting until the next schedule
period, or you can change and hold the temperature setting indefinitely. You can also change the temperature setting
until a designated day and period (for example, while you are on vacation).
Changing Temperature to Temporary Setting Until Next Schedule Period
Press increase ▲ or decrease ▼ until the desired temperature
setpoint displays.
The temporary temperature setting you select displays for
approximately three seconds. The display reads “Temporary”
until the next period begins or when you cancel the temporary
temperature setting.
While selecting a temporary setting, only the setpoint displays.
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Temporary Setting
M14563
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