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Honeywell T8400C Installation Instructions Manual
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Honeywell T8400C Installation Instructions Manual

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Download this manual See also: Owner's Manual, Product Data
APPLICATION
The T8400C Thermostat provides single-stage, non-
programmable 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 T8400C Thermostat is powered through the heating
and/or cooling system controls.
T8400C includes a thermostat, wallplate (for wiring and
mounting thermostat) and Owner's Guide.
MERCURY NOTICE
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 properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of an old control.
®U.S. Registered Trademark
Copyright © 2002 Honeywell
•
• All Rights Reserved
Electronic Thermostat
INSTALLATION INSTRUCTIONS
INSTALLATION
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
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
Caution
Equipment Damage Hazard.
Can short equipment circuitry.
Disconnect power supply before installation.
Location
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.
This thermostat is a precision instrument and was carefully
adjusted at the factory. Handle it carefully.
X-XX UL
T8400C
69-1493-1

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Summary of Contents for Honeywell T8400C

  • Page 1 °F or °C. the product to make sure the product is suitable for your application. The T8400C Thermostat is powered through the heating 3. Installer must be a trained, experienced service and/or cooling system controls.

  • Page 2: Mounting Wallplate To Wall

    T8400C ELECTRONIC THERMOSTAT 5 FEET [1.5 METERS] M11338 Fig. 1. Typical location of thermostat. Mounting Wallplate to Wall Setting Fan Operation (Fuel) Switch The fan operation (fuel) switch is preset at the factory in IMPORTANT the F position. See Fig. 3. This is the correct setting for Level only for appearance.
  • Page 3 SCREW HOLE SCREW HOLE CONTROL (HOT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY INSTALLED JUMPER. M13275 Fig. 6. Typical hookup of T8400C in heat-cool system with single transformers. M16432 Fig. 4. Restrict wiring to shaded area. 69-1493–1...

  • Page 4: Mounting Thermostat To Wallplate

    ENGAGE TABS AT TOP OF THERMOSTAT POWER TO R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH IS IN THE OFF POSITION. M12562 WITH SLOTS ON MOUNTING PLATE. Fig. 7. Typical hookup of T8400C in heat-cool system with two transformers. HEAT CHANGEOVER S e t...

  • Page 5: Operation

    T8400C ELECTRONIC THERMOSTAT Set Temperature Setpoint OPERATION NOTE: Temperature setpoint range is 40° to 99°F (5° to Setting FAN and SYSTEM Switches 37°C). Fan and system settings are controlled manually by using the switches located at the bottom of the thermostat case.
  • Page 6 T8400C ELECTRONIC THERMOSTAT Optional System Checkout 6. Press the key to display the heat cycle rate of 1, When in steps 2 and 3 only, the key can be 3, 4, 5, 6, 9, or 12. If the desired cycle is displayed, used to turn heat or cool outputs on and off.
  • Page 7 In cooling, the fan starts and turer instructions. stops with the cooling equipment. • For compressor protection, during power interruption and on initial startup, the T8400C Make certain all equipment responds properly to the Electronic Thermostat will go into a five minute thermostat.
  • Page 8 T8400C ELECTRONIC THERMOSTAT Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 Printed in U.S.A. on recycled paper containing at least 10% 69-1493–1 G.H. Rev. 2-02 www.honeywell.com/yourhome...