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Honeywell T8401C1015 - Electronic Thermostat - 1 Heat/1Cool Installation Instructions Manual

Installation instructions
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The T8400C and T8401C 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 T8400C Thermostat is powered through the heating/
cooling system controls. The T8401C requires a common
wire for operation. Batteries are not required because
setpoints are held permanently by non-volatile memory.
The T8400C and T8401C 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 © 2004 Honeywell International Inc. •
T8400C, T8401C
Electronic Thermostats
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 T8400C and T8401C 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.
• All Rights Reserved
INSTALLATION INSTRUCTIONS
69-1740

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  Summary of Contents for Honeywell T8401C1015 - Electronic Thermostat - 1 Heat/1Cool

  • Page 1 3. Installer must be a trained, experienced service drafts from affecting the thermostat; see Wiring technician. section. 4. After installation is complete, check out product operation as provided in these instructions. ® U.S. Registered Trademark 69-1740 Copyright © 2004 Honeywell International Inc. • • All Rights Reserved...
  • Page 2 T8400C, T8401C ELECTRONIC THERMOSTATS 5 FEET [1.5 METERS] M11338 Fig. 1. Typical location of thermostat. Wiring WALL IMPORTANT WALL ANCHORS (2) Use an 18-gauge maximum wire to wire the T8400C and T8401C Thermostats. All wiring must comply with local electrical codes and ordinances.
  • Page 3 T8400C, T8401C ELECTRONIC THERMOSTATS KEEP WIRING IN SHADED AREA COOLING CONTACTOR HEATING RELAY PRIMARY 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 transformer. WIRING ENTRANCE MOUNTING MOUNTING...
  • Page 4: Mounting Thermostat To Wallplate

    T8400C, T8401C ELECTRONIC THERMOSTATS DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT HEAT COOL RELAY RELAY RELAY (HOT) TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M20881 Fig. 9. Typical hookup of T8401C in heat-cool system. ENGAGE TABS AT TOP OF THERMOSTAT WITH SLOTS ON MOUNTING PLATE.
  • Page 5: System Switch

    T8400C, T8401C ELECTRONIC THERMOSTATS SYSTEM Switch 3. To increase the temperature setpoint press the key. Each press changes the setpoint one degree; System switch settings control thermostat operation as press and hold to change the setpoint several follows: degrees. Cool: The thermostat controls the cooling system. Off: Both heating and cooling are off.
  • Page 6 T8400C, T8401C ELECTRONIC THERMOSTATS NOTE: In installer setup mode only, each press of the Table 1. Heating Cycle Rates. key momentarily displays 01. Each press of System Cycles Per Hour key momentarily displays 02. When the keys are released, these two-digit codes are no Steam, gravity longer displayed.
  • Page 7 T8400C, T8401C ELECTRONIC THERMOSTATS 3. Press the key to raise the temperature setting above the room temperature. Cooling system 1. Slide the SYSTEM switch to Off and the FAN should shut down. switch to On. The fan should run continuously. 2.
  • Page 8 Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-1740 J.S. 6-04 www.honeywell.com/yourhome...

This manual is also suitable for:

T8400cT8401c