Honeywell RTH111 Owner's Manual - Page 1

n Operation 1. 1.1 Controls Fan switch System switch Temperature adjustment buttons 1.2 Display screen Setpoint indicator Appears when the setpoint temperature is displayed. Temperature Low-battery warning System status • Cool On: Cooling is activated. 1 • Heat On: Heating is activated. 1 When Cool On is flashing, this means the compressor protection is engaged (see section 1.6). 1.3 System switch Use the System switch to place the system in one of the following modes. • Cool: System is in Cooling mode. • Off: System is off. • Heat: System is in Heating mode. CAUTION: EQUIPMENT DAMAGE HAZARD Do not use Cooling mode when the outdoor temperature is below 50 °F (10 °C). 1.4 Fan switch Use the Fan switch to select the fan operation. • Auto: The fan runs only when heating or cooling is actually taking place (commonly used setting). • On: The fan runs continuously. Use this setting for improved air circulation or for more efficient air cleaning. RTH111 User Guide Non-programmable Thermostat 1.5 Temperature adjustment Press the S or T button once to display the setpoint temperature. Press either button more than once to change the setpoint. The ambient (measured) temperature is normally displayed. To view the setpoint temperature, press either of the temperature adjustment buttons once. The setpoint temperature will appear for five seconds. 1.6 Built-in compressor protection Your thermostat has a feature that helps prevent damage to the compressor of your air conditioning system. Because damage can occur if the compressor is restarted too soon after shutdown, this feature forces the compressor to wait five minutes before restarting. During the wait time, the message Cool On flashes on the screen. When the safe wait time has elapsed, the message stops flashing and the compressor turns on. o Battery replacement 2. Set the System switch to Off before removing the batteries. Otherwise, the heating/cooling system could remain activated even when batteries are removed. Install two fresh AAA batteries when the low-battery icon flashes on the screen. The icon appears for 60 days before the batteries are depleted. Replace batteries once a year, or when you will be away for more than a month. The settings are stored in non-volatile (permanent) memory and are thus saved when the thermostat is without batteries. p In case of difficulty 3. Screen is blank. • Ensure two fresh AAA alkaline batteries are correctly installed. Temperature settings • The System switch is off. cannot be changed. • You are setting the temperatures outside their allowable ranges: • Heat: 40 °F to 90 °F (4.5 °C to 32 °C). • Cool: 50 °F to 99 °F (10 °C to 37 °C). Cool On is flashing. • The compressor protection delay has been activated. Cooling will not be activated until the delay ends (maximum of five minutes). HI appears on the • The ambient (measured) temperature is screen. above 122 °F (50 °C). LO appears on the • The ambient (measured) temperature is screen. below 32 °F (0 °C). E1 appears on the • The temperature sensor circuit is opened. screen. Replace the thermostat. E2 appears on the • The temperature sensor circuit is shorted. screen. Replace the thermostat. RTH111 69-2061EFS-01 69-2061EFS-01 11/09 1/8