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follow the instructions on pages 42-43 to change batteries. 2. Filter change indicator - will flash after 400 hours of system use as a reminder to check or change your filter. Press and hold the Filter button for 3 seconds after changing the filter to reset the filter timer. (Pressing the Filter button for less than 3 seconds will cause the Filter change indicator icon to appear. The filter timer will not be affected unless the button is held for more than 3 seconds.) 40 HEATCOOLsystemoffheatcoolreset HEATCOOLsystemoffheatcoolreset iConS anD fEaTurES, ConT. 3. Span setting mode – allows you to adjust the system ON/OFF cycle rate. The default setting is 2 (the system cycles ON or OFF when the temperature is within 1o F (0.5o C) above and below the set temperature.) The span setting can be adjusted if your system is cycling too fast or too slowly. Press and hold both the Up and Down buttons until the word SPAN appears. Use the Up or Down button to adjust the span setting. (Up will increase your cycle time by allowing the system to run longer; Down will decrease your cycle time by causing the system to run for a shorter length of time.) Span settings remain the same for HEAT and COOL system settings. When batteries are installed, or the unit is RESET, the span cycle will revert to 2. 42 STAGE 1 PM COOL 4 M STAGE 2 STAGE 1 PM COOL 4 M STAGE 2 iConS anD fEaTurES, ConT. 4. Low battery warning – indicates two stages of battery power shortage. When the batteries are detected as weak, the icon will flash until new AA alkaline batteries are installed. If the batteries become too weak for normal operation, the thermostat enters the second battery power shortage mode. When insufficient battery power is left, the battery icon will flash alone on the display and your system will turn off. The system will remain off until new batteries are installed. after removing the batteries, program and time settings will remain in memory for one minute. if all battery power is lost, programs and time settings will be erased. The thermostat will resume normal operation after new batteries are installed. 44 hold/return hold/return iConS anD fEaTurES, ConT. 5. Auto recovery – allows heating and cooling systems to gradually recover from an energy-saving setpoint temperature to a comfort setpoint temperature. Auto recovery calculates the time needed to adjust the temperature to the next program setting. When the thermostat is in Auto Recovery mode, the display will flash alternating messages of RECO and the time. Auto Recovery can be disabled by sliding the recovery switch on the back of the circuit board to the disable position. (Auto Recovery will not operate if Permanent or Temporary holds are on.) Press Hold/Return during the Auto Recovery process to manually cancel the recovery. iConS anD fEaTurES, ConT. 6. Error mode – indicates an unexpected battery problem. The screen will flash an ERR message and shut your system off until the batteries are replaced with new AA alkaline batteries. You must Reset and reprogram the thermostat after replacing the batteries if the thermostat has entered Error mode. 7. Auto cut off – automatically turns the system off if the temperature rises above 95o F (35o C) or drops below 40o F (4o C). (If your HVAC system has malfunctioned, the system will no longer respond to thermostat controls and the Auto cut off will have no effect.) 48 1. Temperature range 2. Compressor protectionAfter the system stops running in cooling mode, there will be a 3.5 minute delay before it can be restarted to prevent compressor damage due to rapid cycling. 3. resetting the unitTo restore the thermostat to the original factory settings, press the reset button with a paperclip. (This will erase any user-programs.) resetDisplay Range 30o F 99o F (0o C) (37o C) 45o F Program Range 95o F (7o C) (35o C) Out of Range "HI" >99o F Out of Range "LO" <30o F 1. Temperature range 2. Compressor protectionAfter the system stops running in cooling mode, there will be a 3.5 minute delay before it can be restarted to prevent compressor damage due to rapid cycling. 3. resetting the unitTo restore the thermostat to the original factory settings, press the reset button with a paperclip. (This will erase any user-programs.) resetDisplay Range 30o F 99o F (0o C) (37o C) 45o F Program Range 95o F (7o C) (35o C) Out of Range "HI" >99o F Out of Range "LO" <30o F 49 Wiring Wiring 50 Wiring, ConT. Wiring, ConT. 51 Wiring, ConT. Wiring, ConT. TrouBlEShooTing 1. My display will not come on. 1 a. Check batteries and battery connections. 1 b. Reset the thermostat. ................................................................................... 2. The auto fan feature will not operate properly. 2 a. Remove the thermostat from the wall plate and set the HG/HE switch to the correct position. .............................................................................. 3. My display is erratic. 3 a. Reset the thermostat and reprogram your settings. ...........

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