Honeywell RTH1120 Owner's Manual - Page 2

2.3.1 2-wire Heating 2.3.2 2-wire Cooling Heat relay 2.3.3 3-wire Heating Cool relay 2.3.4 3-wire Cooling Heat relay Fan relay Cool relay Fan relay 2.3.5 4-wire Heating and Cooling 2.4 Setting J2 Jumper The jumper specifies how the fan will operate when it is placed in automatic mode (see section 3.2). HG Leave the jumper in this position if you have a gas or oil heating system. HE Move the jumper to this position if you have an electric heating system. JP2 jumper 2.5 Installing the Batteries n Pull out the battery cover. o Install the batteries as shown. Observe the polarity. p Reinstall the battery cover. You will hear a clicking sound. After the batteries are installed, the thermostat performs a series of tests for approximately 5 seconds. Afterwards, the screen displays the actual temperature. It is normal that the displayed temperature will be higher than the ambient temperature if you hold the thermostat in your hands. It will display the ambient temperature after the thermostat is installed on the wall. By default, the setpoint is 70°F (21°C). 2.6 Completing the Installation Heat relay Cool relay Fan relay 2.3.6 5-wire Heating and Cooling n Once the baseplate and the batteries are installed, mount the thermostat on the baseplate. o Secure the thermostat using the locking screw and install the faceplate. p Apply power back to the system. Fan relay Heat relay Cool relay Note: Remove the red jumper wire between terminals Rc and Rh. RTH1120 69-1875EF-1 29/11/06 2/4