Honeywell T8401C User Manual
T8401C
Electronic Thermostats
INSTALLATION INSTRUCTIONS
APPLICATION
The T8401C Thermostat provides single-stage,
nonprogrammable
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.
temperature control for 24 Vac heating
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 hazardous 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
Set
Room
FAN SYSTEM
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 Powering Method Changeover System Selection Fan Selection
T8401C1031 Hardwired Manual Heat-Off-Cool On-Auto
Cool Off Heat
M14752
Table 1. Thermostat Features
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.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • • All Rights Reserved
69-1483-1
T8401C ELECTRONIC THERMOSTATS
Table 2. Zone Panel Cross Reference.
TotalZone
(TZ-3)
MABS EZ
(EZ-2, EZ-4)
Mini Zone
(MM - 2, -3) MABS II, IIL
T8401C1031 Yes Ye s One Oher One Oher
Yes N o Yes No No
Independent
Zone
NO
NO
Fig. 2. Typical location of 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 functions normally even when not level.
Mount wallplate, T8401C, and the screws provided (see
Fig. 3) as follows:
1. Place the wallplate at the desired location on the
wall.
2. Pull the thermostat wire through the wallplate
entrance hole.
3. Select the two mounting holes that best fit the
application.
4. Fasten the wallplate to the wall using the anchors
and screws provided.
YES
5 FEET
[1.5 METERS]
5. After wiring the wallplate, plug the hole to prevent
.
NO
M11338
drafts from affecting the thermostat; see Wiring
section
WALL
MOUNTING
SCREWS (2)
1
WHEN USING WALL ANCHORS, DRILL 3/16 INCH
HOLES FOR DRYWALL, 7/32 INCH HOLES FOR
PLASTER OR WOOD.
WALL
ANCHORS (2)
1
WALLPLATE
M12202A
Fig. 3. Mounting wallplate to wall.
69-1483—1 2
T8401C ELECTRONIC THERMOSTATS
Setting Fan Operation (Fuel) Switch
The fan operation (fuel) switch is preset at the factory in
the F position. See Fig. 4. This is the correct setting for
most systems. If this system is an electric heat system,
set the switch to the E position. The E setting allows the
fan to turn on immediately with the heating or cooling
equipment in a system where the G terminal is
connected
.
E
F
FAN OPERATION (FUEL) SWITCH
M12580
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.
NOTE: NOTE: To ensure proper mounting of thermo-
stat, restrict all wiring to the shaded area. See
Fig. 5.
The shape of the terminals permits insertion of straight or
wraparound wiring connections; either method is
acceptable. See Fig. 6.
The T8401C is powered directly from the zone panel.
Refer to Fig. 7, 8, and 9 for typical wiring hookups.
KEEP WIRING IN
SHADED AREA
G
C
R
W
Y
MOUNTING
SCREW HOLE
WIRING ENTRANCE
HOLE
Fig. 5. Restrict wiring to shaded area.
FOR STRAIGHT INSERTION
TERMINAL
SCREW
STRIP 5/16 IN. (8 MM)
G
C
B
O
MOUNTING
SCREW HOLE
M14286
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM)
R
W
Y
B
O
M14287
Fig. 6. Wiring connections.
3 69-1483—1
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