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When the thermostat is calling for heat, the flame flickers and the snowflake goes off. When cooling, the snowflake flickers and the flame goes off. LIMITED OVERRIDE When the keyboard is locked (DIP switch #2 ON), the user may override the temperature setpoint hour by pressing either the . or . button. The range of temperature override is ±6°F or the programmed daytime setpoint. Your new digital thermostat has been designed to provide accurate control and display of room temperature. In addition, it also will display all relevant information pertaining to your system. The clearly marked buttons and informative display make it extremely easy to understand and simple to use. Please take a few moments to read the brief instructions and familiarize yourself with the various functions in order to obtain maximum benefit from this truly unique electronic control. GENERAL INFORMATION The thermostat normally displays room temperature, mode of operation and whether cooling or heating is currently on. The two buttons on the front of the unit allow complete control of the equipment. Raising or lowering the setpoint is as simple as pushing a button. In addition, you may choose to display the temperature in °F or °C. The thermostat also allows you to select continuous fan operation (useful when using an air cleaner) or have the fan come on with the equipment. POWER FAILURES Your thermostat employs the latest developments in solid state electronic technology. One of the unique features of your thermostat is that no battery is required to maintain your selected set-points in the event of a power loss as the memory is unaffected by power failures of any duration. When power is restored, the thermostat will continue operating as if the power had never been off. TEMPERATURE ACCURACY Full temperature accuracy will be realized the thermostat has been installed at least one hour. The model 8539 is a single-setpoint heat/cool thermostat. It features a narrow, fixed deadband between internal heat and cool setpoints. USER CONTROLS COOLER To lower the temperature in the zone, press and hold the . button until the desired temperature is displayed, then release. WARMER To raise the temperature in the zone, press and hold the . button until the desired temperature is displayed, then release. The number that is displayed when the button is released is the new setpoint or control temperature for the zone. The display will return to the normal room temperature display after a few seconds. CELSIUS/FAHRENHEIT Simultaneously press . and . to switch between Celsius and Fahrenheit temperature display. NOTES This page intentionally Model 8539 111-172B 97185 USER CONTROLS (Cont’d) FAN ( The fan will come on automatically when the system is operating, but there is no indication of this on the display. To select continuous fan operation, press the FAN button and the display will show $ . This is recommended for electronic air cleaners or continuous ventilation requirements. NOTE: For fan coil applications in which the O and B output terminals control valve position, DO NOT use continuous fan. REMOTE SENSOR (OPTION) RS1 – RS2 – RS+V The thermostat is designed to accept the electronic remote sensor, which will allow you to locate your thermostat in an area away from view. Indoor and outdoor sensors are available separately. ELECTRONIC PROGRAMMABLE THERMOSTAT TWO YEAR LIMITED WARRANTY Your Research Products Corporation Aprilaire ® Thermostat unit is expressly warranted for two (2) years from the date of installation to be free from defects. 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 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, together with the model number, manufacturing code number and installation date of the thermostat. THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE THERMOSTAT ITSELF. IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS PURPOSE SHALL BE LIMITED IN DURATION TO THE (2) YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER PERSONAL INJURIES, RESULTING FROM ANY BREACH IMPLIED WARRANTIES OR THE ABOVE LIMITED EXCLUDED. THIS LIMITED WARRANTY IS VOID FAILURE TO HAVE THIS UNIT INSTALLED BY AIR CONDITIONING CONTRACTOR. IF THE DUE TO FAILURE TO USE A QUALIFIED OF IMPLIED WARRANTIES SHALL BE Some states do not allow limitations lasts or the exclusion or limitation so the above exclusion This warranty gives you other rights which vary This equipment if instructions,complies to Subpart INSTALLATION INSTRUCTIONS LOCATION To ensure proper operation, the thermostat should...