Assessments - 4, GPA: 4.3
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IX. LIGHT SENSOR ADJUSTMENT The light sensor is used for light-activated operation. The sensor can be adjusted for a variable degree of sensitivity. The sensitivity adjustment screw is located on the inner cover of the thermostat, near the DOWN ARROW button. Turning the screw clockwise increases the sensitivity of the sensor to light. Turning the screw counterclockwise decreases the sensitivity of the sensor to light. To check for correct sensitivity, place the thermostat in Program On mode. The thermostat should be in Occupied 1 when the lights are on. If the sensor does not enter Occupied 1 while the lights are on, turn the screw clockwise until the Occupied 1 icon appears on the display. The thermostat should enter Unoccupied mode when the lights are off. If the sensor does not enter Unoccupied when the lights are turned off, turn the screw counterclockwise until the Unoccupied icon appears on the display. IMPORTANT: An external device should not be used with the dry contact switch with light activated operation. The light sensor is wired to the dry contact switch. Another device will cause conflicting signals to the thermostat. The RED wire of the sensor is wired to CK1. The BLACK wire of the sensor is wired to CK2. X. CHECK THERMOSTAT OPERATION To check thermostat operation, perform the following procedure: 1. Press the Mode button repeatedly until the Heat icon appears on the display. The thermostat is now in Heating mode. 2. Press the Fan button. The Fan Auto icon will appear on the display screen. Press the UP ARROW button until the heating set point is 10 F (6 C) higher than the current room temperature. Heating and fan should be energized. 3. Press the Mode button repeatedly until the Cool icon appears on the display. The thermostat is now in Cooling mode. 4. Press the DOWN ARROW button until the cooling set point is 10 F lower than the current room temperature. Cooling and fan should be energized. 5. Press the Mode button repeatedly until the Off icon appears. Press the Fan button until the display reads Fan On. The fan should energize. 6. If heating, cooling, or fan operation do not work, check wiring and consult Table 4. XI. FINAL CHECKLIST 1. Put away tools and instruments. Clean up debris and packaging. 2. Review Owner’s Guide with occupant or owner. 3. Leave the manuals with owner. —6— OPERATION VI. EMERGENCY HEAT The Mode button selects the operating mode of the thermostat. If OFF is selected, the thermostat will not enter Heating or Cooling mode. If HEAT is selected, the thermostat will only enter Heating mode (if the room temperature is below the heating set point). If COOL is selected, the thermostat will only enter Cooling mode (if the room temperature is above the cooling set point). If AUTO is selected, the thermostat will enter Heating or Cooling mode based on the room temperature and the heating and cooling set points. If PROGRAM ON is selected, the stored schedule is enabled and the thermostat will follow the Occupied and Unoccupied schedules stored in its memory. I. AUTO-CHANGEOVER When the thermostat mode is set to AUTO, the thermostat will provide automatic changeover from Heating to Cooling mode and Cooling to Heating mode when required. The thermostat will automatically switch to maintain the desired temperature setting. The thermostat does not need to be manually changed from heating to cooling or cooling to heating operation. II. LIGHT-ACTIVATED OPERATION A light sensor is provided on the thermostat for light activation. The thermostat must be in Program On mode for light activation to be initiated. When the sensor detects light (the space is occupied), the thermostat will enter Occupied 1 mode and heat or cool according to the Occupied 1 set points. If the room is dark, the thermostat will follow its programmed schedule. NOTE: Light activation does not work in Holiday mode. III. TWO-STAGE OPERATION The second stage of heat or cool is turned on when the first stage has been on for a minimum of 2 minutes and the temperature differential from the set point is equal to or greater than the set point plus the deadband plus 2 degrees. IV. CLOCK BACKUP In the event of a power loss, the thermostat will keep time for a minimum of 48 hours without external power or batteries. V. FAN OPERATION If Fan On is selected, the fan will run continuously during occupied schedule (except when Mode is switched to OFF). The fan will be off during unoccupied schedule except during heating or cooling operation. If Fan On is not selected, the fan will only operate during heating or cooling operation. Emergency heat is available for heat pump applications. To turn on emergency heat, press and hold the Fan button. While holding the Fan button, press the UP button for 2 seconds. An ‘‘EH’’ will be displayed. During emergency heat, the fan will operate and the second stage of heat will be energized (locking out the first stage compressor). To exit emergency heat, press and hold the Fan button. While holdi...