Honeywell ELECTRONIC THERMOSTATS T8401C Installation Instructions Manual
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Honeywell ELECTRONIC THERMOSTATS T8401C Installation Instructions Manual

Honeywell ELECTRONIC THERMOSTATS T8401C Installation Instructions Manual

Electronic thermostats
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See also: Owner's Manual , Product Data
APPLICATION
The T8401C Thermostat provides single-stage,
nonprogrammable temperature control for 24 Vac heating
cooling systems with manual changeover from heat to
cool. Heating cycle rate is selectable at 1, 3, 6, 9 or 12
cph. Cooling cycle reate is fixed at 3 cph. Temperature
indicature indication can be set for °F or °C.
The T8401C1031 (Fig. 1) is powered directly from the
zone panel. Batteries are not required because setpoints
are held permanently by non-volatile memory.
T8401C models include a thermostat, wallplate (for
wiring and mounting thermostat) and owner's guide. See
Table 1 for a listing of thermostat features. See Table 2
for a listing of zone panels that can be used with the
T8401C.
Set
Room
FAN
Auto On
Fig. 1. The T8401C1031 Thermostat.
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.
Model
T8401C1031
® U.S. Registered Trademark
Copyright © 2002 Honeywell •
SYSTEM
Cool Off Heat
M14752
Table 1. Thermostat Features
Powering Method
Hardwired
Manual
• All Rights Reserved
Electronic Thermostats
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of an old control.
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
Damage to Heating/Cooling System Possible.
Be careful when handling wires during
installation. Disconnect power at furnace or main
breaker/ fuse box.
Location
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 2. 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.
Changeover
System Selection
Heat-Off-Cool
T8401C
INSTALLATION INSTRUCTIONS
Fan Selection
On-Auto
69-1483-1

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Summary of Contents for Honeywell ELECTRONIC THERMOSTATS T8401C

  • Page 1 Install the thermostat about 5 ft (1.5m) above the floor in SYSTEM Cool Off Heat an area with good air circulation at average temperature. See Fig. 2. Do not install the thermostat where it can be M14752 affected by: — drafts or dead spots behind doors and in corners.

  • Page 2: Mounting Wallplate To Wall

    T8401C ELECTRONIC THERMOSTATS TotalZone (TZ-3) T8401C1031 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.
  • Page 3 FAN OPERATION (FUEL) SWITCH Fig. 4. Fan operation (fuel) switch. Wiring IMPORTANT Use an 18-gauge thermostat cable for proper wiring. All wiring must comply with local electrical codes and ordinances. Disconnect the power supply to prevent electrical shock or equipment damage.

  • Page 4: Mounting Thermostat To Wallplate

    Fig. 9. T8401 with MABS II and MABS IIL control panel (zone one). 69-1483—1 Mounting Thermostat to Wallplate 1. Engage the tabs at the top of the thermostat and MOTOR 2. Swing down the thermostat and press the lower M14288...

  • Page 5: Settings And Adjustments

    INDICATOR ROOM TEMPERATURE Room SETPOINT TEMPERATURE in the lower right corner of the thermostat to the desired mode. See Fig. 11. display, press either the temperature setpoint is displayed for approximately five seconds as the indicator points to Set and flashes.
  • Page 6 T8401C ELECTRONIC THERMOSTATS Optional System Checkout When in steps 2 and 3 only, the turn heat or cool outputs on and off. Change the SYSTEM switch setting to test heat or cool outputs. No action takes place If the SYSTEM switch is in the Off position.
  • Page 7 50°F (10°C). Refer to equipment manufacturer instructions. For compressor protection, during power interruption and on initial startup, the T8401C Electronic Thermostat will go into a 5 minute delay. During this delay the cooling icon, a snowflake , will flash.
  • Page 8 $XWRPDWLRQ DQG &RQWURO 6ROXWLRQV +RQH\ZHOO +RQH\ZHOO /LPLWHG+RQH\ZHOO /LPLWpH  'RXJODV 'ULYH 1RUWK  '\QDPLF 'ULYH *ROGHQ 9DOOH\ 01  6FDUERURXJK 2QWDULR 09 = 69-1483—1 G.H. Rev. 2-02 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. www.honeywell.com/yourhome...

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