Aprilaire 8554 Thermostat User Manual

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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 The Weekday Program For Heating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Setting Or Changing The Weekend Program For Heating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Setting Or Changing Cooling Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

Setting High And Low Balance Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Using The Available Red LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Optional Settings For Additional Thermostat Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

In Case Of Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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 8554 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 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

THERMOSTAT

SYMBOL

DESIRED

TEMPERATURE

SETTING

EVENT

Mon Tue Wed Thu

Fri

Sat Sun

Morning

Heat = 70˚

Cool = 78˚

6:00 6:00 6:00 6:00 6:00 6:00 6:00

am am am am am am am

Day

Evening

Night

Heat = 62˚

Cool = 85˚

8:00 8:00 8:00 8:00 8:00 8:00 8:00

am am am am am am am

Heat = 70˚

Cool = 78˚

5:00 5:00 5:00 5:00 5:00 5:00 5:00

pm pm pm pm pm pm pm

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: If you are currently in Daylight Saving Time

(first Sunday in April thru fourth Sunday in October),

press the DST button and “ “ will appear in the

lower right-hand corner of the display.

Step 2: 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 3: Press the CLOCK button again and “12:” (hours)

and “AM” or “PM” will flash. Use the DECREASE or

INCREASE button to change the flashing symbol

to the current hour making sure the hour has the proper

AM or PM designation.

Step 4: 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 5: 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 1 program for Monday through Friday and 1 program for Saturday and

Sunday. 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.

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PROGRAM SCHEDULE

TIME SCHEDULE

THERMOSTAT

SYMBOL

DESIRED

TEMPERATURE

SETTING

MONDAY –

FRIDAY

SATURDAY &

SUNDAY

EVENT

Morning

Heat =

Cool =

Day

Evening

Night

Heat =

Cool =

Heat =

Cool =

Heat =

Cool =

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 The Weekday Program For Heating Mode

Step 1: Press and release the MODE button until the word “HEAT” and

the “ ” heating symbol

appear on the display.

Step 2: Press and

release the PROGRAM button –

“

Mo Tu We Th Fr”; Morning

event symbol “ ”; flashing

12:” (or some other hour); and flashing “AM” or “PM” will appear on

“

the display. You are now setting the time you want your heating

equipment to come on in the morning.

Step 3: Press the DECREASE

button or INCREASE

” event.

button to set the desired hour for the Morning “

Step 4: Press and release the PROGRAM button – “:00”

or some other minutes) will flash.

(

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Step 5: Press the DECREASE

button or INCREASE

button to set the desired minutes for the Morning “

event (program starting times are set in ten-minute

increments).

”

Step 6: Press and release the PROGRAM button – the current

heating temperature will begin to flash. You are now setting

the heating temperature you desire in the morning.

Step 7: Press the DECREASE

button or INCREASE

” event.

button to set the desired heating temperature for the Morning “

Step 8: Press and release the PROGRAM button – the Day “

” event symbol will appear. You are

now setting the time and heating temperature you want throughout the day.

Step 9: Repeat steps 2-6 to complete programming for the Day “

Step 10: Press and release the PROGRAM button – the Evening “

” event.

” event symbol will appear.

You are now setting the time and heating temperature you want during the evening.

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Step 11: Repeat steps 2-6 to complete programming for the Evening “

” event.

Step 12: Press and release the PROGRAM button – the Night “

” event symbol will appear.

You are now setting the time and heating temperature you want at night.

Step 13: Repeat steps 2-6 to complete programming for the Night “ ” event.

Setting Or Changing The

Weekend Program For Heating Mode

Step 1: After setting the Night “ ” event Weekday program, press and release the PROGRAM button.

“

Sa Su”; the Morning “ ” event symbol; flashing

12:” (or some other hour); and flashing “AM” or “PM”

“

will appear on the display. You are now programming the

time and temperatures for the weekend.

Step 2: Repeat steps 2-6 identical to Weekday

programming for Morning “ ”,

Evening “ ”, and Night “ ” events for

heating mode as applicable.

”, Day “

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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.

NOTE: Your event starting times are the same in the cooling mode program as the heating mode start

times. Example: If your program start time for the Morning “

” event is 7:00 AM for heating, the

cooling start time is already programmed for

7:00 AM as well. Once you change the program

starting time for an event, the thermostat

automatically changes the starting time for

both the heating and cooling modes.

Step 1: Press and release the MODE button until

the word “COOL” and the “

” cooling symbol

appear on display.

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Step 2: Press and release the PROGRAM button – “Mo Tu

We Th Fr”; Morning“

”event symbol; and flashing

starting time you programmed will appear on the display.

Step 3: Press and release the PROGRAM button repeatedly

until the temperature flashes.

Step 4: Press the DECREASE

button or INCREASE

button to set the desired cooling temperature (for the morning

event). You are now setting the cooling temperature you

want in the morning.

Step 5: Repeat steps 2-4 for the Day “

”,

Evening “ ”, and Night “ ” events.

Step 6: After selecting the cooling temperature for the

Weekday Night “ ” event, press and release the PROGRAM

button. “Sa Su”; Morning “

” event symbol; and flashing

starting time you programmed will appear on the display.

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Step 7: Press and release the PROGRAM button until the temperature for the Morning “

” event

flashes. Repeat steps 2-4 for the Morning “

Night “ ” events.

”, Day “

”, Evening “

”, and

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 repeatedly to advance to “Mo Tu We Th Fr”, or “Sa Su”

and specific event. Continue pressing the PROGRAM button to review the time schedules and

temperature settings for each desired event.

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, the thermostat will resume automatically in

approximately 15 seconds.

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For Best Performance

The Aprilaire Model 8554 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, lamps, or portable

humidifiers, near the thermostat.

. Although the thermostat is internally equipped to prevent short cycling of the heat pump, 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 8554 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 8554

Day Programmable Thermostat

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TEMPERATURE CONTROL

•

Reading the Actual Room Temperature: The Model 8554 normally displays the room temperature,

not the set-point temperature.

•

Check the Set-Point Temperature: Press and release the DECREASE

button. The thermostat will display the programmed set-point temperature and a thermometer for

seconds before automatically returning to the actual room temperature display.

button or INCREASE

•

Temporarily Override the Set Temperature: Press and hold the DECREASE

button or

INCREASE 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 increments. 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 heating or air conditioning 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 when

neither heating nor air conditioning is needed.

•

Selecting Cooling Mode: Press the MODE button until the word "COOL" appears on the display.

In this mode the cooling system will maintain the 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 cooling system is running.

Selecting Heating Mode: Press the MODE button until the word "HEAT" appears on the display.

In this mode the heating system will maintain temperature according to the programming previously

completed unless an override temperature has been entered. Note that a Flame icon, “ “ 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 back-up heat source (other than the heat pump) will maintain temperatures 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 the temperature according to the programming previously completed unless an

override temperature has been entered. The heating and cooling systems will not operate at the

same time. Either will turn on 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 whether the heat pump is

heating or cooling.

•

Turning the System Off: Press the MODE button until the word "OFF" appears on the display. In this

mode neither heating nor air conditioning will operate regardless of the temperature. The thermostat

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can still be programmed, the optional outdoor temperature sensor will work and the heat pump 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 heat pump.

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 back-up heat without the heat

pump. Conversely, the use of back-up 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, then press the 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.

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After accessing a balance point, it can be changed by pressing the DECREASE

button or

INCREASE

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.

Using The Available Red 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 back-up 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.

Use of left and right LEDs will require additional wiring at the thermostat and equipment which should

only be done by a qualified heating and cooling contractor.

Optional Settings For Additional Thermostat Features

The Model 8554 thermostat is equipped with 6 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.

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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 8554 DIP switches control the following functions:

No. 1 – 4 min./2 min. 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 this switch without

first consulting with your contractor.

No. 2 – Keypad Lock. If tampering with the thermostat is expected and unwanted, the keypad can be

locked by moving this switch from the factory set OFF position to the ON position. 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.

The DECREASE 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.

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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 pushing any buttons other than the buttons

outlined above.

No. 3 – 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 operating costs.

No. 4 – This switch is not used and must remain in the OFF position.

No. 5 – Free LED 1 with LCD Filter Symbol. When moved to the ON position, this switch turns on a

replace Filter icon on the LCD display screen when a 24-volt signal is sent to the LED 1 terminal.

If your heat pump has the required controls for automatically determining when to change the air

filter, this feature is beneficial. Consult your contractor for further information.

No. 6 – Free LED 2 with LCD Wrench Symbol. When moved to the ON position, this switch turns on a

Wrench icon on the LCD display screen when a 24-volt signal is sent to the LED 2 terminal. If your

heat pump has the required controls for automatically signaling when a particular problem exists,

this feature is beneficial. 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:

Figure 1

a) Turn off power to

the thermostat.

b) Completely open the

thermostat cover.

The cover will snap

into this position.

CAUTION: TO PREVENT DAMAGE, AVOID CONTACT

WITH BLUE TEMPERATURE SENSOR ON BOTTOM RIGHT-

HAND CORNER OF THERMOSTAT CIRCUIT BOARD.

c) Carefully insert a medium-

sized flathead screwdriver

into the latch access slot

(see Figure 1).

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Figure 2

Figure 3

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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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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10-792B 7/12/01 8:28 AM Page 29

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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In Case Of Power Failure

The Model 8554 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 a 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 resume that 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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10-792B 7/12/01 8:28 AM Page 31

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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10-792B 7/12/01 8:28 AM Page 32

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

The Best Cure For Dryness

High Efficiency Air Cleaner

Nobody Makes Clean Air Easier

Fresh Air Exchanger

™

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. supply of fresh air with energy-recovery.

Your best value for a constant, controlled

Zone Control System

Custom Comfort Throughout Your Home

Electronic Thermostat

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

B2202155 REV. 04/01

110-792B