Aprilaire Thermostat 8551 User Manual

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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 Weekday 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 1 cooling temperature.

Your Aprilaire Thermostat allows 1 program for Monday through Friday and 1 program for Saturday

and Sunday. Complete the chart on page 4 with your desired temperatures and time schedules

before beginning programming.

NOTE: It will take some time for your 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

Day

Evening

Night

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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Step 1: Press and release the MODE button until the word

“COOL” and the “ ” cooling 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 cooling equipment to

come on in the morning.

Step 3: Press the DECREASE

button or INCREASE

button to set the desired hour for the Morning “

”

event.

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

cooling temperature will begin to flash. You are now setting

the cooling temperature you desire in the morning.

Step 7: Press the DECREASE

button or INCREASE

button to set the desired cooling temperature for the Morning “

” event.

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

” event symbol will appear. You are

now setting the time and cooling 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 cooling 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 cooling temperature you want at night.

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

Setting Or Changing The Weekend Program

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

cooling mode as applicable.

”, Day “

”,

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Reviewing Programmed Time Schedules

And Temperature Settings

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.

For Best Performance

The Aprilaire Model 8551 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.

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2. Do not place anything which can give off warm or cool air, such as candles, lamps, or portable

humidifiers, near the thermostat.

3. Although the thermostat is internally equipped to prevent short cycling of the 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 cooling cycles.

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