Installation Instructions
Page 1
...heat from ducts. - This thermostat is suitable for appearance. Mount the T8400C and T8401C with good air circulation at average temperature. Registered Trademark Copyright © 2004 Honeywell International Inc. • • All Rights Reserved 69-1740 T8400C, T8401C Electronic Thermostats INSTALLATION INSTRUCTIONS The T8400C and T8401C Thermostats...or Equipment Damage Hazard. Handle it can be set for 24V heating-cooling systems with manual changeover from affecting the thermostat; The thermostat functions normally even when not level. unheated (uncooled) areas such...
...heat from ducts. - This thermostat is suitable for appearance. Mount the T8400C and T8401C with good air circulation at average temperature. Registered Trademark Copyright © 2004 Honeywell International Inc. • • All Rights Reserved 69-1740 T8400C, T8401C Electronic Thermostats INSTALLATION INSTRUCTIONS The T8400C and T8401C Thermostats...or Equipment Damage Hazard. Handle it can be set for 24V heating-cooling systems with manual changeover from affecting the thermostat; The thermostat functions normally even when not level. unheated (uncooled) areas such...
Installation Instructions
Page 4
... FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 FIELD INSTALLED JUMPER. Mounting thermostat wallplate. M20881 Fig. 9. Typical hookup of the thermostat and wallplate. 2. 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. In heating, the fan is controlled directly by using an electric heat thermostat, the fan starts and stops...
... FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 FIELD INSTALLED JUMPER. Mounting thermostat wallplate. M20881 Fig. 9. Typical hookup of the thermostat and wallplate. 2. 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. In heating, the fan is controlled directly by using an electric heat thermostat, the fan starts and stops...