Aprilaire 8555 Thermostat User Manual

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®
ELECTRONIC THERMOSTAT
Owner’s Manual
MODEL 8555
7 Day Programmable
Thermostat
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OWNER’S MANUAL – TABLE OF CONTENTS
ENERGY STAR Program Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Setting Or Changing The Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Setting Or Changing The Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Progressive Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Program Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Setting Or Changing Program Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting Or Changing Program Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
• Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
• Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Reviewing Programmed Time Schedules And Temperature Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
To Start Running The Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
For Best Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Thermostat Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
• Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
• Time Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• Equipment Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Optional Settings For Additional Thermostat Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Setting High And Low Balance Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Using Available LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
In Case Of Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
®
© Research Products Corporation 2001
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ENERGY STAR Program Information
®
About half of all energy used by households goes to heating and cooling the
home. By selecting a programmable Aprilaire® Electronic Thermostat, you
have made a significant step toward conserving energy usage and costs,
while improving your indoor comfort.
In fact, the Aprilaire Electronic Thermostat Model 8555 has earned the ENERGY STAR designation of the
U.S. Environmental Protection Agency (EPA). This means that your Aprilaire Thermostat is a highly
efficient, cutting edge product that is good for the environment. It saves energy and costs less to
operate than similar products that do not qualify for the ENERGY STAR label.
ENERGY STAR products help you differentiate between standard efficiency and high efficiency products.
By using ENERGY STAR products you are helping to prevent air pollution while saving money on your
utility bills.
According to the EPA, taking advantage of the times that a home is unoccupied or the occupants
are asleep, an ENERGY STAR thermostat can reduce heating and cooling bills by as much as 30%. The
Aprilaire Thermostat has programmable capabilities that allow you full flexibility to set your heating
and cooling systems to meet your comfort and energy needs. As an ENERGY STAR partner, Research
Products has determined that this product meets the ENERGY STAR guidelines for energy efficiency.
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As part of the ENERGY STAR program, your thermostat has been programmed with the following times and
temperatures. This has been done to achieve energy efficiency and lower energy bills. If you need to
modify your program schedule, see page 7.
TIME SCHEDULE
EVENT
THERMOSTAT
SYMBOL
DESIRED
TEMPERATURE
SETTING
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Morning
Heat = 70˚
Cool = 78˚
6:00
am
6:00
am
6:00
am
6:00
am
6:00
am
6:00
am
6:00
am
Day
Heat = 62˚
Cool = 85˚
8:00
am
8:00
am
8:00
am
8:00
am
8:00
am
8:00
am
8:00
am
Evening
Heat = 70˚
Cool = 78˚
5:00
pm
5:00
pm
5:00
pm
5:00
pm
5:00
pm
5:00
pm
5:00
pm
Night
Heat = 62˚
Cool = 82˚
10:00 10:00 10:00 10:00 10:00 10:00 10:00
pm
pm
pm
pm
pm
pm
pm
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IMPORTANT: READ ALL INSTRUCTIONS THOROUGHLY
Programming your Aprilaire Thermostat is done in three easy steps: setting the clock, setting the event
times, and setting your desired temperatures.
Setting Or Changing The Clock
Step 1: Press the CLOCK button and “Mo”
(or another day of the week) will flash. Use the
DECREASE
or INCREASE
button to
change the flashing symbol to the current day
of week.
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Step 2: Press the CLOCK button again and “12:” (hours)
and “AM” or “PM” will flash. Use the DECREASE
INCREASE
or
button to change the flashing symbol
to the current hour making sure the hour has the proper
AM or PM designation.
Step 3: Press the CLOCK button and “:00” (minutes) will
flash. Use the DECREASE
or INCREASE
button
to change the flashing symbol to the current minute.
Step 4: Press the CLOCK button again. The clock is now
set and the current time appears on the display.
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Setting Or Changing The Program
Programming your Aprilaire Electronic Thermostat involves selecting the temperature you want in your
home and selecting the time you want it to be that temperature. Your Aprilaire Thermostat will allow a
maximum of 4 time schedules per day. Each time schedule is known as an “event.” The Morning event
is typically when you wake up and is the first event of the day. The Day event is typically set when you
leave for work. The Evening event is typically set when you come home from work and the Night event
is set when you go to bed. Each event will have 2 temperatures, 1 heating temperature and 1 cooling
temperature. The cooling temperature must be at least 2 degrees higher than the heating temperature.
Your Aprilaire Thermostat allows a different program for each day of the week. Complete the chart on
page 7 with your desired temperatures and time schedules before beginning programming.
Progressive Recovery
Your Aprilaire Thermostat is equipped with a programming feature called “Progressive Recovery.”
This feature assures that your house will economically achieve the desired comfort temperature at
the programmed time when returning from an economy or setback temperature. For example, if you
like a wake-up temperature of 68°F at 6:00 AM from a setback of 65°F it is not necessary to set the
morning program for 5:00 AM. The thermostat will automatically start warming your house in advance
so your comfort temperature is reached on time. The progressive recovery feature must be activated
in order to work.
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To activate the progressive recovery
mode simultaneously press the
PROGRAM and FAN buttons. A small
thermostat icon, “
“, will appear
under the clock. Once in this mode
proceed with programming your
thermostat remembering to use exact
times for each event time change.
NOTE: If not using Progressive Recovery, it will take some time for your heating or cooling system to reach the
desired temperature when returning from a setback. Therefore, it is suggested you set your program time before the
actual time you want your home to reach the desired temperature. For example, if you get up at 7:00 AM and have a
6 degree setback, set your Morning event at 6:00 AM to be sure the desired temperature is reached by 7:00 AM.
NOTE: This thermostat can be programmed with either 2 events per day (day and night) or 4 events per day (morning,
day, evening, and night). Before programming the thermostat, decide which setting is best for your personal schedule.
The thermostat is factory preset for 4 events per day. To change to two events per day, refer to page 20 “Optional
Settings for Additional Thermostat Features,” or contact your contractor for assistance.
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PROGRAM SCHEDULE
TIME SCHEDULE
EVENT
THERMOSTAT
SYMBOL
DESIRED
TEMPERATURE
SETTING
Morning
Heat =
Cool =
Day
Heat =
Cool =
Evening
Heat =
Cool =
Night
Heat =
Cool =
Mon
Tue
Wed
Thu
Fri
Sat
Sun
NOTE: While programming you must press a button at least every 2 minutes or the thermostat will revert back to the
operational mode. If this happens, simply repeatedly press or press and hold the PROGRAM button until you get back
to where you left off. The information you have already entered has been retained.
NOTE: If consecutive events have the same temperature, you can skip an event by simultaneously pressing the
PROGRAM and MODE buttons. Press and release the PROGRAM button to advance to the next event.
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Setting Or Changing
Program Times
Step 1: Press and release the PROGRAM button.
“Mo” or the current day of the week will flash and the
Morning “
“ event symbol will appear on the
display. Press the DECREASE
button or INCREASE
button to access the day of the week you wish to
start programming or to change the existing program.
Step 2: Press and release the PROGRAM button.
The hours and “AM” or “PM” will flash. Press the
DECREASE
button or INCREASE
set the start time hours for the Morning “
button to
“
event for Monday (or any other day as set in step 1).
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Step 3: Press and release the PROGRAM button.
The minutes will flash on the display. Press the
DECREASE
button or INCREASE
button to
set the select time minutes for the Morning “
“
event (program times are set in ten-minute increments).
Step 4: Press and release the program button. The Day
“
” event symbol, flashing hours, and “AM” or “PM”
will appear on the display. Repeat steps 2 and 3 for the
Day “
”, Evening “
”, and Night “
”.
Step 5: Press and release the PROGRAM button. The word “Copy” and the day just programmed will
appear on the display. If your schedule is the same for consecutive days, press the DECREASE
button or INCREASE
button to add days to the display. This prevents from having to program the
same times over and over again or continue on to step 6 to program the next day.
Step 6: Press and release the PROGRAM button to continue to the next day to be programmed.
Repeat steps 2-5 for each day.
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Setting Or Changing
Heating Temperatures
Step 1: Press and release the MODE button until the
word “Heat” and the Morning “
” event symbol
appear on the display.
Step 2: To set all program temperatures, press and
release the SET TEMP button. The Morning “
event symbol and flashing temperature will appear on
the display.
Step 3: Press the DECREASE
INCREASE
“
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button or
button to set the desired Morning
“ event temperature.
”
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Step 4: Repeat steps 2 and 3 for the Day “
”, Evening “
NOTE: If thermostat is set for 2 events per day, only the Day “
”, and Night “
” and Night “
” events.
” events can be programmed.
Setting Or Changing Cooling Temperatures
NOTE: Cooling temperatures must be set at least 2 degrees higher
than heating temperatures. (Example: If heating temperature is set at
70˚F, cooling temperature must be set to at least 72˚F or higher.) If not
set at least 2 degrees higher, the thermostat will automatically lower
the previously programmed heating temperature to maintain the
2 degree separation.
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Step 1: Press and release the MODE button until the word “COOL” and
the “
” cooling symbol appear on display.
Step 2: To set all program temperatures, press and release
the SET TEMP button. The Morning “
” event symbol
and flashing temperature will appear on the display.
Step 3: Press the DECREASE
button or INCREASE
to set the desired morning event temperature.
Step 4: Repeat steps 2 and 3 for the Day “
Evening “
”, and Night “
”,
” events.
NOTE: If thermostat is set for 2 events per day, only the
Day “
” and Night “ ” events can be programmed.
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button
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Reviewing Programmed Time Schedules
And Temperature Settings
Step 1: Press and release the MODE button repeatedly to advance to the desired mode
(heating or cooling).
Step 2: Press and release the PROGRAM button to begin review. Continue pressing the PROGRAM
button to review the time schedules and temperature settings for each desired event. To review a
specific day use the DECREASE
button or INCREASE
button to access the day without
having to view previous programmed days.
To Start Running The Program
After all temperatures and start times have been programmed, press and release the RESUME button
to start running programs. If no button is pressed thermostat will resume automatically in approximately
15 seconds.
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For Best Performance
The Aprilaire Model 8555 thermostat is designed for accurate temperature control and easy
operation. The following guidelines should be followed to ensure proper operation of the thermostat:
1. When the thermostat is operating, close the cover to allow for proper air circulation over the
temperature sensor.
2. Do not place anything which can give off warm or cool air, such as candles or portable
humidifiers, near the thermostat.
3. Although the thermostat is internally equipped to prevent short cycling of the furnace and air
conditioner, it is possible to inadvertently override this protection. Do not start, stop, and restart
the equipment without allowing a minimum of 2 minutes between heating or cooling cycles.
Thermostat Operation
The Model 8555 is a full-featured thermostat which allows for additional control and operations after
basic time and temperature programming is completed. In addition to the programming buttons used
to set up all event times and temperatures, additional buttons control the following functions:
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Aprilaire Model 8555
7 Day Programmable Thermostat
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TEMPERATURE CONTROL
• Reading the Actual Room Temperature: The Model 8555 normally displays the room temperature,
not the set-point temperature.
• Check the Set-Point Temperature: Press and release the DECREASE
button or INCREASE
button. The thermostat will display the programmed set-point temperature and a thermometer for
5 seconds before automatically returning to the actual room temperature display.
• Temporarily Override the Set Temperature: Press and hold the DECREASE
INCREASE
button or
button to change the room set-point temperature in 1 degree increments.
The new set-point temperature will be held for 3 hours, then the thermostat will automatically
return to the program.
• Hold a New Temperature Set Point: Press and hold the DECREASE
button or INCREASE
button to change the room set-point temperature in 1 degree steps. The new set-point temperature
can be maintained indefinitely by pressing and releasing the HOLD button. The word “HOLD” will
be displayed. The thermostat will maintain this new set-point temperature until the RESUME button
is pressed returning the thermostat to the original program. This procedure is typically used during
extended vacant periods (vacations, business trips, etc.), to hold an economical set point until
you return.
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• Returning to Programmed Operation: At any time, press the RESUME button to return the
thermostat to operate as programmed.
• Change Between °C and °F : The thermostat has the capability of displaying either Celsius or
Fahrenheit temperatures. If the displayed temperature seems abnormally high or low
(ie: 70˚F = 21˚C) you may need to switch to ˚C or ˚F by simultaneously pressing the
DECREASE
button and the INCREASE
button.
• Checking the Outdoor Temperature: If your thermostat was installed with the optional
Aprilaire Outdoor Temperature Sensor, simply press the OUTDOOR button and the
thermostat will display the outdoor temperature for 5 seconds before automatically returning
to the actual room temperature display.
TIME CONTROL
• Change From 12- to 24-Hour Clock: Press and release the CLOCK button, then press the MODE
button. To return to a standard clock, repeat the process.
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EQUIPMENT CONTROL
• Turning on the Fan: At any time the system fan can run continuously by pressing the FAN button.
Note that a Fan icon, “
“, appears in the lower part of the display indicating that the fan is
continuously operating. To return the fan to the normal operating mode, press the FAN button again
which will remove the icon from the display. In the normal operating mode the fan will only run when
the heat pump is operating. Continuous fan operation is beneficial if your system is equipped with a
high efficiency air cleaner or a humidifier, or to circulate air in the home.
• Selecting Cooling Mode: Press the MODE button until the word "COOL" appears on the display.
In this mode the heat pump will maintain temperature according to the programming previously
completed unless an override temperature has been entered. Note that a Snowflake icon, “
“,
is on the display, which flashes when the heat pump is running. Your thermostat will automatically
turn on and off any additional stages of cooling as required.
• Selecting Heating Mode: Press the MODE button until the word "HEAT" appears on the display.
In this mode the heat pump will maintain temperature according to the programming previously
completed unless an override temperature has been entered. Note that a Flame icon, “
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,“ is on the
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display, which flickers when the heat pump is running. Your thermostat will automatically turn on and
off any additional stages of heating as required.
• Selecting Emergency Heat Mode: Press the MODE button until “E ht” appears on the display. In this
mode the backup heat source (other than the heat pump) will maintain temperature according to the
programming previously completed unless an override temperature has been entered.
• Automatic Heating and Cooling: This mode can be useful during times of the year and in climates
when it is cool at night requiring heating but warm in the afternoon requiring cooling. Press and
release the MODE button until the word "AUTO" appears on the display. In this mode the heat pump
will maintain temperature according to the programming previously completed unless an override
temperature has been entered. The heat pump will operate in either the heating or cooling mode
depending on which programmed set point is closest to the room temperature. Note that both the
Snowflake “
“ and Flame “
“ icons are on the display. The Snowflake will flash or the Flame
will flicker depending on which mode the heat pump is operating in.
• Turning the System Off: Press the MODE button until the word "OFF" appears on the display. In this
mode the heat pump will not operate regardless of the temperature. The thermostat can still be
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programmed, the optional outdoor temperature sensor will work and the fan will turn on if the
FAN button is pressed. To avoid frozen water pipes, DO NOT use the OFF mode for long periods
of time during sub-freezing temperatures.
NOTE: After selecting a new mode, the thermostat initiates a delay of up to 4 minutes to protect the heating and
cooling equipment.
Optional Settings For Additional Thermostat Features
The Model 8555 thermostat is equipped with 8 DIP switches located inside the thermostat on the printed
circuit board. These switches are preset by the factory to typical home heating and cooling system
requirements. The installing contractor also reviewed the settings during installation to be sure the
thermostat will operate properly with your heating and cooling system.
The DIP switches can however be changed to customize the thermostat’s operation to your particular
needs. This should only be done after consulting with your contractor.
The Model 8555 DIP switches control the following functions:
No. 1 – 4 or 2 Events Per Day. The switch is factory preset for 4 events per day; Morning, Day, Evening,
and Night. If it is more convenient you can select a 2-event day, Morning and Night, by moving this
switch to the ON position.
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No. 2 – Smart Fan. The thermostat is factory preset with the Smart Fan option off. This allows the system
fan to operate normally with the heating and cooling equipment. If the Smart Fan option is turned
on by placing the DIP switch in the ON position when the Fan button on the thermostat is pushed
(indicated by the fan icon on the display), the system fan will run continuously during the Morning,
Day, and Evening events. During the Night event, the fan will automatically revert to cycling on and
off with the heating and cooling equipment.
No. 3 – 4 Minute / 2 Minute Minimum Equipment On/Off Times. This switch is factory preset at 2
minutes. This switch provides short cycle protection for the heat pump. If you feel that the heat
pump turns on and off too many times per hour, ask your contractor about changing the switch to
a 4 minute minimum on time. Keep in mind, however, that this may increase the overall temperature
variation in the house due to longer run and off times. Do not change the position of the switch
without first consulting with your contractor.
No. 4 – Keypad Lock. If tampering with the thermostat is expected and unwanted, the keypad can be
locked by moving this switch from the factory-preset OFF position to ON. This should not be done
until all programming is finalized. In the locked position only the following functions can be done:
•
The outdoor temperature button will display the outdoor temperature.
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•
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The DECREASE
Page 24
button or INCREASE
button will temporarily change the set point
a maximum of ±6°F (±3°C) for a period of 3 hours, before the thermostat
automatically returns to the original program.
If the thermostat does not respond when a button is pushed it may be because the keypad has been
locked. A Lock icon “
“ will appear when a button other than OUTDOOR is pushed if the keypad
has been locked.
No. 5 – Normal Heat Pump /Add-on Heat Pump. This switch is factory preset to the OFF position to
operate in the Normal heat pump mode. If your heating and cooling system is an add-on heat pump
configuration, your contractor changed the position of this switch to match your equipment. Do not
change the position of this switch as it could result in extraordinarily high operation costs.
No. 6 – Single-/Multi-Stage Outputs. This switch is factory preset to the ON position, allowing the
thermostat to operate 2-stage heat pumps. Do not change the position of this switch without first
consulting your installing contractor. Two-stage systems will not operate properly with the switch
set for single-stage outputs.
No. 7 – Free LED 1 with LCD Filter Symbol. When moved to the ON position, this switch turns on a
Replace Filter icon on the display screen when a 24-volt signal is sent to LED 1 (top left edge of the
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thermostat panel, not on the display). If your heating/cooling system has the required controls for
automatically determining when to change the air filter, this feature is beneficial. Consult your
contractor for further information.
No. 8 – Free LED 2 with LCD Wrench Symbol. When moved to the ON position, this switch turns on a
Wrench icon on the display screen when a 24-volt signal is sent to LED 2 (top right edge of the
thermostat panel, not on the display). This feature is beneficial if your heating/cooling system has
the required controls for automatically signaling when a particular problem exists. Consult your
contractor for further information.
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To change the DIP switch settings, the thermostat must be
removed from the base which is attached to the wall.
The power to the thermostat must be turned off
before disassembling or the thermostat can be
permanently damaged. If you do not know
where the switch is that
controls the power to your
thermostat, do not attempt to
access the DIP switches. The
following procedure must
be carefully followed:
a) Turn off power to
the thermostat.
b) Completely open the
thermostat cover.
The cover will snap
into this position.
c) Carefully insert a mediumsized flathead screwdriver
into the latch access slot
(see Figure 1).
Figure 1
CAUTION: TO PREVENT DAMAGE, AVOID CONTACT
WITH BLUE TEMPERATURE SENSOR ON BOTTOM RIGHTHAND CORNER OF THERMOSTAT CIRCUIT BOARD.
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Figure 2
d) Gently push in and pry up on the handle of the
screwdriver until the lock tab disengages from the
catch tab (you should feel or hear a click –
see Figure 2).
e) After the latch releases, grip the thermostat panel at
the bottom corners and swing it up and away from
the base to completely separate (see Figure 3).
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Figure 3
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Once the thermostat panel has been opened and removed from the base, turn the thermostat over
and locate the DIP switches found on the circuit board according to the following drawing:
Be careful to change only the intended DIP switches per the
explanation given at the beginning of this section.
After the DIP switches have been
set to the desired position,
carefully reassemble the
thermostat.
a) Place the cover
on the base by lining up
the 2 round pegs on the
bottom of the cover with
the half circle cutouts on
the top of the base. Note
that the bottom of the
cover when fully open
slides in behind the top
of the base. Swing the cover
fully open. The cover will stay
in place.
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Figure 4
b)
Align the hinge tabs on the base and
thermostat panel. Swing the panel to the
base and snap in place at bottom of
thermostat panel (see Figure 4).
c)
Turn the thermostat power back on.
CAUTION: TO PREVENT
DAMAGE, AVOID CONTACT WITH BLUE
TEMPERATURE SENSOR ON BOTTOM
RIGHT-HAND CORNER OF THERMOSTAT
CIRCUIT BOARD.
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Setting High And Low Balance Points
If your system is installed with the required Model 8041 Remote Outdoor Sensor, the high and low
balance points should have been properly set by your contractor.
Heat pumps operate by extracting energy out of the outdoor air and transferring it to the indoor air.
This process is efficient over a wide range of temperatures. However, at low outdoor temperatures
there is a point at which it becomes more economical to operate the backup heat without the heat
pump. Conversely, the use of backup heat with the heat pump during mild weather could use more
energy than is required to heat the home.
To review the set points, press and hold the OUTDOOR button and press FAN button. Hi bP and its
temperature value will appear on the display. Next, press the OUTDOOR button again and Lo bP and
its temperature value will appear on the display. After approximately 15 seconds the display will return
to normal.
After accessing a balance point, it can be changed by pressing the DECREASE
INCREASE
button or
button. This should only be done after consulting with a qualified contractor. Improperly
set balance points can result in increased energy expenses and possible equipment damage.
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Using The Available LED Indicators
This model is equipped with 3 LED indicator lights. These LEDs are located along the top edge of
the thermostat panel (not on the display) and look like small, clear edges protruding out of the top of the
thermostat. The center LED is factory wired and will glow red when the backup heat source is being
used. When the left and/or right LED is supplied with a 24 VAC signal, the LEDs glow red and can be used
to indicate many other system functions such as when the humidifier or fresh air exchanger is running.
Contact your installing contractor to understand what the left and/or right LEDs signal.
Use of left and right LEDs will require equipment and additional wiring at the thermostat which should
only be done by a qualified heating and cooling contractor.
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In Case Of Power Failure
The Model 8555 thermostat does not require a battery. If the power goes out the letters “AC” appear
on the display indicating power is not being supplied to the thermostat. “AC” will remain on the display
for up to approximately 1 hour after the power goes out. During the period that the power is off, the
heating/cooling system will not operate.
This thermostat is equipped with a continuous memory feature which does not require any battery. The
thermostat will never lose what has been programmed regardless of the length of the power outage. If
the thermostat has been set to “Hold” a particular temperature and the power fails, the thermostat will
maintain the hold temperature when the power is restored.
After a period of 1 hour without power the clock will need to be reset. The clock will default to
12:00 AM. Refer to the Programming Instructions to reset the clock.
Cleaning
If the surface of the thermostat becomes dirty it can be cleaned with plain water or many non-abrasive
household cleaners, such as glass cleaner. When using any cleaner be careful not to get any into the
interior of the thermostat. Do not spray any cleaner directly onto the thermostat. Spray the cleaner onto
a soft cloth and wipe the surface of the thermostat.
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Limited Warranty
Your Research Products Corporation Aprilaire® Thermostat unit is expressly warranted for two (2) years from date of
installation to be free from defects in materials and workmanship.
Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a
replacement for any thermostat which is found to be defective within a two (2) year period and which is returned, together
with the date of installation, no later than thirty (30) days after said two (2) year period by you to either your original
supplier or to Research Products Corporation, Madison, Wisconsin 53701.
THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL
NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO
DEFECTS IN THE THERMOSTAT ITSELF.
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL
BE LIMITED IN DURATION TO THE AFORESAID TWO YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S
LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES,
RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS
EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS
THERMOSTAT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE LIMITED
WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED
WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or
consequential damages, so the above exclusion or limitations may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from state
to state.
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Notes:
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Notes:
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The Aprilaire® Total Indoor Air Comfort System is an integrated group of air quality enhancement
products designed to work with your heating and cooling system to make your home more comfortable.
For the best in indoor air quality, ask your heating and cooling contractor about these fine
Aprilaire products, or visit us at www.aprilaire.com for your Indoor Air Solutions.
Automatic Humidifier
High Efficiency Air Cleaner
Fresh Air Exchanger
The Best Cure For Dryness®
Nobody Makes Clean Air Easier ®
Only The Freshest Homes Have April Air™
The world’s first computer-equipped,
completely automatic humidifier.
The economical, trouble-free, high
efficiency air cleaner for your home.
Your best value for a constant, controlled
supply of fresh air with energy-recovery.
Zone Control System
Electronic Thermostat
Custom Comfort Throughout Your Home®
Energy Efficiency Never Looked So Good™
The most reliable way to achieve temperature
control in every area of your home.
Ultra-thin, easy-to-use programmable or digital
controls featuring pinpoint accuracy.
P.O. BOX 1467 • MADISON, WI 53701-1467
Products For Better Indoor Air Quality ™
B2202157
REV. 04/01
110-793B