Table of Contents
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The T8400 and T8401 Thermostats provide single-stage,
non-programmable temperature control for 24V 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 T8400 Thermostat is powered through the heating/
cooling system controls. The T8401 requires a common
wire for operation. Batteries are not required because
setpoints are held permanently by non-volatile memory.
The T8400 and T8401 models include 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.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of an old control containing
mercury in a sealed tube.
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.
® U.S. Registered Trademark
Copyright © 2002 Honeywell •
T8400C1099, T8401C1031
Electronic Thermostats
• All Rights Reserved
INSTALLATION INSTRUCTIONS
CAUTION
Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or 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.
Mounting Wallplate to Wall
IMPORTANT
Level only for appearance. The thermostat func-
tions normally even when not level.
Mount the T8400 and T8401 with the screws provided
(see Fig. 2) as follows:
1. Place the wallplate at the desired location on the
wall.
2. Pull the thermostat wire through the entrance hole
on the wallplate.
3. Fasten the wallplate to the wall using the anchors
and screws provided.
4. After wiring the wallplate, plug the hole to prevent
drafts from affecting the thermostat; see Wiring
section.
69-1484-2
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Table of Contents
Related Manuals for Honeywell T8400C1099
Summary of Contents for Honeywell T8400C1099
- Page 1 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.
- Page 2 T8400C1099, T8401C1031 ELECTRONIC THERMOSTATS WALL WALL ANCHORS (2) MOUNTING SCREWS (2) WHEN USING WALL ANCHORS, DRILL 3/16 INCH HOLES FOR DRYWALL, 7/32 INCH HOLES FOR PLASTER OR WOOD. Fig. 2. Mounting wallplate to wall. Setting Fan Operation (Fuel) Switch The fan operation (fuel) switch is preset at the factory in the F position.
-
Page 3: Heat Pump Systems
TERMINAL STRIP 5/16 IN. (8 MM) SCREW Fig. 5. Wiring connections (T8400C1099 shown). T8400C1099, T8401C1031 ELECTRONIC THERMOSTATS (HOT) Fig. 6. Typical hookup of T8400C1099 in heat-cool MOUNTING SCREW HOLE (HOT) COOLING M16432 TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. -
Page 4: Mounting Thermostat To Wallplate
Fig. 10. Typical hookup of T8401C1031 in single- stage heat pump system. 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. -
Page 5: System Switch
SETPOINT TEMPERATURE To set temperature setpoint: 1. Select Heat or Cool by sliding the SYSTEM switch in the lower right corner of the thermostat to the desired mode. See Fig. 12. 2. To display the temperature setpoint on the digital... - Page 6 T8400C1099, T8401C1031 ELECTRONIC THERMOSTATS NOTE: In installer setup mode only, each press of the key momentarily displays 01. Each press of key momentarily displays 02. When the keys are released, these two-digit codes are no longer displayed. 3. Press the key.
- Page 7 NOTE: To bypass the five-minute delay, see the Optional System Checkout section. T8400C1099, T8401C1031 ELECTRONIC THERMOSTATS 1. Slide the SYSTEM switch to Off and the FAN switch to On. The fan should run continuously. 2. Slide the FAN switch to Auto. In heating, the fan is...
- Page 8 T8400C1099, T8401C1031 ELECTRONIC THERMOSTATS Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-1484-2 G.H. Rev. 11-02 Printed in Mexico www.honeywell.com/yourhome...