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Aprilaire 8551 - page 1
O w n e r’ s M an u al MODEL 8551 5-2 Day Programmable Thermostat EL E CTR O NIC THERM O S T A T ® 110-904 7/11/01 4:29 PM Page 1 ...
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Aprilaire 8551 - page 2
OWNER’S MANUAL – T ABLE OF CONTENTS Setting Or Changing The Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Setting Or Changing The W eekday Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Program Schedule . . . . . . . . . . . . . ...
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Aprilaire 8551 - page 3
– 1 – IMPORT ANT : READ ALL INSTRUCTIONS THOROUGHL Y 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 T ime (first Sunday in April thru fourth Sunday in October), p ...
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Aprilaire 8551 - page 4
– 2 – 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 INCRE ...
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Aprilaire 8551 - page 5
– 3 – Setting Or Changing The W eekday 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. Y our Aprilaire Thermostat will allow a maximum of 4 time schedules per day . Each time schedule is known as an “ event. ” The Mor ...
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Aprilaire 8551 - page 6
– 4 – PROGRAM SCHEDULE TIME SCHEDULE THERMOST A T DESIRED MONDA Y – SA TURDA Y & EVENT SYMBOL TEMPERA TURE FRIDA Y SUNDA Y SETTING 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 PROG ...
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Aprilaire 8551 - page 7
– 5 – 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 T u We Th F r ”; Morning event symbol “ ”; flashing “ 12: ” (or some other hour); and flashing “ AM ” or “ PM ” will appear on the display . ...
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Aprilaire 8551 - page 8
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. Y ou are now setting the cooling temperature you desire in the morning. Step 7: ...
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Aprilaire 8551 - page 9
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 . Y ou 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 Th ...
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Aprilaire 8551 - page 10
Reviewing Programmed T ime Schedules And T emperature Settings Press and release the PROGRAM button repeatedly to advance to “ Mo T u 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. T o Start Running The Program After all temperat ...
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Aprilaire 8551 - page 11
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 allow ...
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Aprilaire 8551 - page 12
– 10 – 110-904 7/11/01 4:29 PM Page 12 ...
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Aprilaire 8551 - page 13
• T emporarily Override the Set T emperature: 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 T emperature Set Point: Press and hold the DECREAS ...
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Aprilaire 8551 - page 14
• 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 T emperature: ...
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Aprilaire 8551 - page 15
EQUIPMENT CONTROL • T urning on the Fan: At any time the system fan can run continuously by pressing the FA N button. The Fan icon, “ “ , will appear in the lower part of the display indicating that the fan is operating continuously . T o return the fan to the normal operating mode, press the FA N button again which will remove the icon from ...
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Aprilaire 8551 - page 16
Optional Settings For Additional Thermostat Features The Model 8551 thermostat is equipped with 2 DIP switches located inside the thermostat on the printed circuit board. These switches are preset by the factory to typical home air conditioning system requirements. The installing contractor also reviewed the settings during installation to be sure ...
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Aprilaire 8551 - page 17
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 di ...
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Aprilaire 8551 - page 18
– 16 – T o 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 D ...
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Aprilaire 8551 - page 19
– 17 – 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) . 1 ...
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Aprilaire 8551 - page 20
– 18 – 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 th ...
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Aprilaire 8551 - page 21
– 19 – 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) T urn the thermostat power back on. CAUTION: TO PREVENT DAMAGE, A VOID CONT ACT WITH BLUE TEMPERA TURE SENSOR ON BOTTOM RIGHT -HAND CORNER OF THERMOST A T CIRCUIT BOARD. 110-90 ...
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Aprilaire 8551 - page 22
– 20 – In Case Of Power Failure The Model 8551 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 ...
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Aprilaire 8551 - page 23
– 21 – Limited W arranty Y our 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 ...
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Aprilaire 8551 - page 24
B2202104 REV . 11/99 1 10-904 P .O. BOX 1467 • MADISON, WI 53701-1467 Products For Better Indoor Air Quality ™ The Aprilaire ® T otal Indoor Air Comfort System is an integrated gr oup of air quality enhancement products designed to work with your heating and cooling system to make your home mor e comfortable. F or the best in indoor air qualit ...
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