Aprilaire 8552 Thermostat User Manual

OWNER’S MANUAL – TABLE OF CONTENTS

Energy Star Program Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Setting Or Changing The Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Setting Or Changing The Weekday Program For Heating Mode . . . . . . . . . . . . . . . . . . . . . . . . . 5

Program Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Setting Or Changing The Weekend Program For Heating Mode . . . . . . . . . . . . . . . . . . . . . . . . . 9

Setting Cooling Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Reviewing Programmed Time Schedules And Temperature Settings . . . . . . . . . . . . . . . . . . . . 12

To Start Running The Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

For Best Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Thermostat Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

•

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Time Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Equipment Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Optional Settings For Additional Thermostat Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

In Case Of Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Research Products Corporation 2000

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 8552 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.

–

1 –

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 6.

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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2 –

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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3 –

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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4 –

Setting Or Changing The

Weekday Program For Heating Mode

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 6 with your desired temperatures and time schedules

before beginning programming:

NOTE: 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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5 –

PROGRAM SCHEDULE

TIME SCHEDULE

THERMOSTAT

SYMBOL

DESIRED

TEMPERATURE

SETTING

MONDAY – SATURDAY &

FRIDAY 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 15 seconds or the thermostat will revert back to the

operational mode. If this happens, simply repeatedly press 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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6 –

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

or cooling 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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7 –

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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8 –

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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9 –

Setting 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 “

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

” event is 7:00 AM for heating, the

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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10 –

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

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11 –

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 thermostat will resume automatically in approximately

15 seconds.

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12 –

For Best Performance

The Aprilaire Model 8552 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.

. 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 8552 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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13 –

TEMPERATURE CONTROL

•

Reading the Actual Room Temperature: The Model 8552 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 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.

– 15 –

•

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 3 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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16 –

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. For some heat-only systems, continuous fan operation

may not be an option.

•

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

In this mode the air conditioning system 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 air conditioning 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

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17 –

completed unless an override temperature has been entered. Note that a Flame icon, “ “ is on the

display, which flickers when the furnace is running.

•

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 cooling

and heating system will maintain 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 which equipment is running.

•

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

mode neither heating or air conditioning will operate regardless of the temperature. The thermostat

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

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18 –

Optional Settings For

Additional Thermostat Features

The Model 8552 thermostat is equipped with 3 DIP switches located inside the thermostat on the

printed circuit board. These switches are preset by the factory to typical home heating and air

conditioning system requirements. The installing contractor also reviewed the settings during installation

to be sure the thermostat will operate properly with your heating and air conditioning 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 8552 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 furnace and air conditioning unit. If you feel

that the furnace or air conditioning system 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.

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19 –

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 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.

The DECREASE button or INCREASE button will temporarily change the set

point a maximum of plus or minus 3 degrees for a period of 1 hour, 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. 3 – Fan with Heat Call. This switch was set by the installing contractor to operate the thermostat

properly with your equipment. DO NOT change the position of this switch without consulting with

the installing contractor.

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20 –

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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21 –

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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22 –

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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23 –

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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24 –

In Case Of Power Failure

The Model 8552 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 30 minutes 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.

After a period of 30 minutes 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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25 –

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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26 –

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Energy Efficiency Never Looked So Good

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