Owner's Manual
Page 10
... Cool. • Check the system fuse or circuit breaker and replace or reset if necessary. • Check for air movement at the register. • Check power to the heating or cooling equipment. • Adjust the temperature by pressing either the ▲ or ▼ key. 69-1490 10 Temperature setting is below...
... Cool. • Check the system fuse or circuit breaker and replace or reset if necessary. • Check for air movement at the register. • Check power to the heating or cooling equipment. • Adjust the temperature by pressing either the ▲ or ▼ key. 69-1490 10 Temperature setting is below...
Installation Instructions
Page 1
... Electronic Thermostats INSTALLATION INSTRUCTIONS The T8400C and T8401C Thermostats provide singlestage, non-programmable temperature control for 24V heating-cooling systems with good air circulation at average temperature. Registered Trademark Copyright © 2002 Honeywell • • All ... MERCURY NOTICE If this Product... 1. After installation is powered through the heating/ cooling system controls. Disconnect power supply before installation. drafts or dead spots behind the thermostat. The T8400C Thermostat is complete, check out product operation as an outside...
... Electronic Thermostats INSTALLATION INSTRUCTIONS The T8400C and T8401C Thermostats provide singlestage, non-programmable temperature control for 24V heating-cooling systems with good air circulation at average temperature. Registered Trademark Copyright © 2002 Honeywell • • All ... MERCURY NOTICE If this Product... 1. After installation is powered through the heating/ cooling system controls. Disconnect power supply before installation. drafts or dead spots behind the thermostat. The T8400C Thermostat is complete, check out product operation as an outside...
Installation Instructions
Page 2
... Mount decorator cover plate (SUPER TRADELINE® model only), wallplate, T8400C or T8401C, and the screws provided (see Wiring section. The T8400C Thermostat is powered directly from affecting the thermostat; x 5-3/4 IN. Disconnect the power supply to wall. 69-1480-1 2 See Fig. 4. DECORATOR COVER...3-7/8 IN. Mounting Decorator Cover Plate and Wallplate to the wall using the anchors and screws provided. 5. see Fig. 2) as follows: 1. T8400C AND T8401C ELECTRONIC THERMOSTATS YES NO NO 5 FEET [1.5 METERS] NO M10308 Fig. 1. After wiring the wallplate, plug the hole to Fig...
... Mount decorator cover plate (SUPER TRADELINE® model only), wallplate, T8400C or T8401C, and the screws provided (see Wiring section. The T8400C Thermostat is powered directly from affecting the thermostat; x 5-3/4 IN. Disconnect the power supply to wall. 69-1480-1 2 See Fig. 4. DECORATOR COVER...3-7/8 IN. Mounting Decorator Cover Plate and Wallplate to the wall using the anchors and screws provided. 5. see Fig. 2) as follows: 1. T8400C AND T8401C ELECTRONIC THERMOSTATS YES NO NO 5 FEET [1.5 METERS] NO M10308 Fig. 1. After wiring the wallplate, plug the hole to Fig...
Installation Instructions
Page 3
...REQUIRED. 2 IN T8401C INSTALLATIONS, CONNECT C TERMINAL. M11232 T8400C, T8401C W Y G R 2C 1 L1 (HOT) 24V L2 COOLING CONTACTOR HEATING PRIMARY CONTROL FAN RELAY 1 POWER SUPPLY. M18416 B PRESS LOWER EDGE OF CASE TO LATCH. T8400C/T8401C heat-cool wiring diagram in oil heating/electric cooling system... 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. Wiring connections. When using the switches located at the top of ...
...REQUIRED. 2 IN T8401C INSTALLATIONS, CONNECT C TERMINAL. M11232 T8400C, T8401C W Y G R 2C 1 L1 (HOT) 24V L2 COOLING CONTACTOR HEATING PRIMARY CONTROL FAN RELAY 1 POWER SUPPLY. M18416 B PRESS LOWER EDGE OF CASE TO LATCH. T8400C/T8401C heat-cool wiring diagram in oil heating/electric cooling system... 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. Wiring connections. When using the switches located at the top of ...