Aprilaire 8553 owner manual Following procedure must beFigure 1 carefully followed

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110-790B 7/11/01 3:11 PM Page 25

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 beFigure 1 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 medium- sized flathead screwdriver into the latch access slot (see Figure 1).

CAUTION: TO PREVENT DAMAGE, AVOID CONTACT WITH BLUE TEMPERATURE SENSOR ON BOTTOM RIGHT- HAND CORNER OF THERMOSTAT CIRCUIT BOARD.

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Contents Model Cooling Temperature ControlEquipment Control Energy Star Program Information Cool = 78˚ Heat = 70˚Heat = 62˚ Cool = 85˚Change the flashing symbol to the current day Week Setting Or Changing The Clock110-790B 7/11/01 311 PM Progressive Recovery Setting Or Changing The Program110-790B 7/11/01 311 PM Heat = Cool = Program ScheduleSetting Or Changing Program Times Night Press and release the program button. The DaySetting Or Changing Heating Temperatures Night events Setting Or Changing Cooling TemperaturesRepeat steps 2 and 3 for the Day Evening , and Night events Press and release the Mode button until the wordTo Start Running The Program Reviewing Programmed Time Schedules Temperature SettingsThermostat Operation For Best PerformanceAprilaire Model Day Programmable Thermostat Return to the program Temperature ControlTime Control Equipment Control Time during sub-freezing temperatures Optional Settings For Additional Thermostat Features Automatically returns to the original program Installing contractor Following procedure must beFigure 1 carefully followed See Figure Place the cover On the base by lining up Turn the thermostat power back on Case Of Power Failure Cleaning Limited Warranty BOX 1467 MADISON, WI