Installation Instructions
Page 2
...thermostat. Setting Fan Operation (Fuel) Switch The fan operation (fuel) switch is acceptable. Mounting wallplate to prevent electrical shock or equipment damage. Refer to Fig. 6 through 10 for most systems. If this system is the correct setting for typical wiring hookups. This is an electric heat system, set the switch to turn... proper mounting of thermostat, restrict all wiring to wire the T8400C and T8401C Thermostats. M12202A Fig. 2. either method is preset at the factory in a system where the G terminal is connected. T8400C, T8401C ELECTRONIC THERMOSTATS YES NO NO ...
...thermostat. Setting Fan Operation (Fuel) Switch The fan operation (fuel) switch is acceptable. Mounting wallplate to prevent electrical shock or equipment damage. Refer to Fig. 6 through 10 for most systems. If this system is the correct setting for typical wiring hookups. This is an electric heat system, set the switch to turn... proper mounting of thermostat, restrict all wiring to wire the T8400C and T8401C Thermostats. M12202A Fig. 2. either method is preset at the factory in a system where the G terminal is connected. T8400C, T8401C ELECTRONIC THERMOSTATS YES NO NO ...
Installation Instructions
Page 4
... and may start a few minutes after the heating equipment turns on (on most homes. See Fig. 11. In heating, the fan is controlled directly by using an electric heat thermostat, the fan starts and stops with the cooling equipment. T8400C, T8401C ELECTRONIC THERMOSTATS G C R W B Y O 1 L1 (HOT) 24V L2 TRANSFORMER HEAT RELAY COOL RELAY FAN RELAY 1 POWER SUPPLY. Typical hookup...
... and may start a few minutes after the heating equipment turns on (on most homes. See Fig. 11. In heating, the fan is controlled directly by using an electric heat thermostat, the fan starts and stops with the cooling equipment. T8400C, T8401C ELECTRONIC THERMOSTATS G C R W B Y O 1 L1 (HOT) 24V L2 TRANSFORMER HEAT RELAY COOL RELAY FAN RELAY 1 POWER SUPPLY. Typical hookup...
Installation Instructions
Page 5
... to change the setpoint several degrees. INCREASE SETTING DECREASE SETTING T8400C, T8401C ELECTRONIC THERMOSTATS 3. Change the SYSTEM switch setting to change the setpoint several degrees. M14685 2. Heat: The thermostat controls the heating system. Each press changes the setpoint one degree; press and hold to ...cool is off . Slide the SYSTEM switch in °F, set the temperature setpoint to turn heat or cool outputs on . M14680 Setting °F/°C Indication and Heat Cycle Rate NOTE: To save changes to Room when the room temperature is displayed and to...
... to change the setpoint several degrees. INCREASE SETTING DECREASE SETTING T8400C, T8401C ELECTRONIC THERMOSTATS 3. Change the SYSTEM switch setting to change the setpoint several degrees. M14685 2. Heat: The thermostat controls the heating system. Each press changes the setpoint one degree; press and hold to ...cool is off . Slide the SYSTEM switch in °F, set the temperature setpoint to turn heat or cool outputs on . M14680 Setting °F/°C Indication and Heat Cycle Rate NOTE: To save changes to Room when the room temperature is displayed and to...
Installation Instructions
Page 6
... setup mode and return to display heating/cooling temperature control default.. Press the ▲ key again. Heating equipment should start . Cooling CAUTION Low Temperature Hazard. The fan starts and stops with the cooling equipment. 69-1740 6 T8400C, T8401C ELECTRONIC THERMOSTATS NOTE: In installer setup mode only...▼ key again to C1 or C3. In conventional systems, the system turns on initial startup, the T8400C and T8401C Thermostats go into a five-minute delay. When using an electric heat thermostat, the fan starts immediately. 3. Press the ▼ key to manufacturer's...
... setup mode and return to display heating/cooling temperature control default.. Press the ▲ key again. Heating equipment should start . Cooling CAUTION Low Temperature Hazard. The fan starts and stops with the cooling equipment. 69-1740 6 T8400C, T8401C ELECTRONIC THERMOSTATS NOTE: In installer setup mode only...▼ key again to C1 or C3. In conventional systems, the system turns on initial startup, the T8400C and T8401C Thermostats go into a five-minute delay. When using an electric heat thermostat, the fan starts immediately. 3. Press the ▼ key to manufacturer's...
Installation Instructions
Page 7
Be sure all equipment responds correctly to Auto. T8400C, T8401C ELECTRONIC THERMOSTATS Fan 1. Cooling system should run continuously. 2. Slide the FAN switch to the thermostat. 7 69-1740 When using an electric heat thermostat, the fan starts and stops with the cooling equipment. NOTE: To bypass ... Optional System Checkout section. In heating, the fan is controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on (on most systems). In cooling, the fan starts and stops with the heating equipment. 3. Slide the SYSTEM ...
Be sure all equipment responds correctly to Auto. T8400C, T8401C ELECTRONIC THERMOSTATS Fan 1. Cooling system should run continuously. 2. Slide the FAN switch to the thermostat. 7 69-1740 When using an electric heat thermostat, the fan starts and stops with the cooling equipment. NOTE: To bypass ... Optional System Checkout section. In heating, the fan is controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on (on most systems). In cooling, the fan starts and stops with the heating equipment. 3. Slide the SYSTEM ...