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Honeywell T8000C Installation Instructions Manual

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The T8000C Thermostat provides single-stage, program-
mable temperature control for 24 Vac heating-cooling
systems with manual changeover from heat to cool.
Heating cycle rate is selectable at 1, 3, 4, 5, 6, 9, or 12
cph. Cooling cycle rate is fixed at 3 cph. Temperature
indication can be set for °F or °C.
The T8000C Thermostat is powered through the heating/
cooling system controls. Batteries are not required
because setpoints are held permanently by non-volatile
The T8000C TRADELINE® model includes a thermostat,
wallplate and Owner's Guide. A 7 3/8 in. (188 mm) x 5 3/4
in. (146 mm) decorator cover plate (for covering wall
marks) is available separately. Order Honeywell part no.
209649A (taupe) or part no. 209649B (white).
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of it properly.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of a control.
®U.S. Registered Trademark
Copyright © 2002 Honeywell •

Programmable Thermostat

Table 1. Description of T8000C Thermostats.
System Selection
• All Rights Reserved
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
4. After installation is complete, check out product
operation as provided in these instructions.
Hazardous Voltage.
Can damage heating/cooling system.
Disconnect power at furnace or main breaker/fuse
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1. Do not install the thermostat where it can be
affected by:
— drafts or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from the sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Fan Selection
Powering Method
Power Stealing



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  Summary of Contents for Honeywell T8000C

  • Page 1: Programmable Thermostat

    °F or °C. the product to make sure the product is suitable for your application. The T8000C Thermostat is powered through the heating/ 3. Installer must be a trained, experienced service cooling system controls. Batteries are not required technician.
  • Page 2: Wiring

    Use an 18-gauge maximum wire for wiring the functions normally even when not level. T8000C Thermostat. Mount wallplate and the T8000C with the screws provided All wiring must comply with local electrical codes and (see Fig. 2) as follows: ordinances. Disconnect the power supply to prevent 1.
  • Page 3: Mounting Thermostat To Wallplate

    POWER TO R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH IS IN THE OFF POSITION. M12562 Fig. 6. Typical hookup of T8000C in heat-cool system with two transformers. Setting Fan Operation (Fuel) Switch The fan operation (fuel) switch is preset at the factory in M12560 the F position.
  • Page 4: Installer Setup

    T8000C PROGRAMMABLE THERMOSTAT 1. Enter Installer Setup. DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT keys to set the temperature setpoint to 52°F (11°C). M12582A Press the keys simultaneously for more than two seconds to enter Installer Setup. Release the keys...
  • Page 5: Operation

    T8000C PROGRAMMABLE THERMOSTAT If the desired cycle rate is displayed, press the equipment and may start a few minutes after the key to exit the installer setup. heating equipment turns on (most systems). When To change the the fan operation (fuel) switch is in the E position, heat cycle rate, the fan starts and stops with the heating equipment.
  • Page 6: Checkout

    Table 3), press Hold to exit the programming mode. CAUTION Setting Time and Temperature The T8000C is preprogrammed with the time and tem- Damage To Compressor Possible. Operating at too low of an outdoor temperature perature settings shown in Table 3. For instructions on may cause compressor damage.