Honeywell T8400C Installation Instructions - Page 3
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T8400C AND T8401C ELECTRONIC THERMOSTATS KEEP WIRING IN SHADED AREA ALTERNATE MOUNTING SCREW HOLE W Y G R C MOUNTING SCREW HOLE ALTERNATE MOUNTING SCREW HOLE WIRING ENTRANCE HOLE MOUNTING SCREW HOLE M11023 Fig. 3. Restrict wiring to shaded area. W Y T8400C, T8401C W Y G R 2C 1 L1 (HOT) 24V L2 COOLING CONTACTOR 1 L1 (HOT) L2 FAN RELAY T T OIL PRIMARY CONTROL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 IN T8401C INSTALLATIONS, CONNECT C TERMINAL. M11022B Fig. 6. T8400C/T8401C heat-cool wiring diagram in oil heating/electric cooling system. Oil primary has its own transformer. Mounting Thermostat to Wallplate 1. Engage the tabs at the top of the thermostat and wallplate. 2. Swing down the thermostat and press the lower edge of the thermostat onto the wallplate to latch. See Fig. 7. DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT G FOR WRAPAROUND STRIP 7/16 IN. (11 MM) R FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM) C TERMINAL SCREW Fig. 4. Wiring connections. M11232 T8400C, T8401C W Y G R 2C 1 L1 (HOT) 24V L2 COOLING CONTACTOR HEATING PRIMARY CONTROL FAN RELAY 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 IN T8401C INSTALLATIONS, CONNECT C TERMINAL. M11021B Fig. 5. T8400C/T8401C heat-cool wiring diagram in single transformer system with gas heat/electric cooling. Set Room Set Room FAN Auto On SYSTEM Cool Off Heat FAN Auto SYSTEM Cool Off Heat A ENGAGE TABS AT TOP OF THERMOSTAT WITH SLOTS ON WALLPLATE. M18416 B PRESS LOWER EDGE OF CASE TO LATCH. Fig. 7. Mounting thermostat wallplate. OPERATION Setting FAN and SYSTEM Switches Fan and system settings are controlled manually by using the switches located at the bottom of the thermostat case. See Fig. 8. FAN Switch Fan switch settings are: On: The fan runs continuously. Use for improved air circulation and air quality. Auto: Normal setting for most homes. In cooling, the fan starts and stops with the cooling equipment. 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). When using an electric heat thermostat, the fan starts and stops with the heating equipment. 3 69-1480-1