Honeywell T8401C Bedienungsanleitung

® U.S. Registered Trademark

INSTALLATION INSTRUCTIONS

69-1483-1

T8401C

Electronic Thermostats

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.

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.

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.

M14752

FAN SYSTEM

Auto On Cool Off Heat

Set Room

Table 1. Thermostat Features

Model Powering Method Changeover System Selection Fan Selection

T8401C1031 Hardwired Manual Heat-Off-Cool On-Auto

T8401C ELECTRONIC THERMOSTATS

69-1483—1 2

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 func-

tions 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.

5. After wiring the wallplate, plug the hole to prevent

drafts from affecting the thermostat; see Wiring

section

Fig. 3. Mounting wallplate to wall.

Table 2. Zone Panel Cross Reference.

TotalZone

(TZ-3)

MABS EZ

(EZ-2, EZ-4)

Mini Zone

(MM - 2, -3) MABS II, IIL

Independent

Zone

T8401C1031 Yes Yes One Oher One Oher

Yes N o Yes No No

5 FEET

[1.5 METERS]

YES

M11338

M12202A

WALL WALL

ANCHORS (2)

WALLPLATE

WHEN USING WALL ANCHORS, DRILL 3/16 INCH

HOLES FOR DRYWALL, 7/32 INCH HOLES FOR

PLASTER OR WOOD.

MOUNTING

SCREWS (2)

T8401C ELECTRONIC THERMOSTATS

3 69-1483—1

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

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.

Fig. 5. Restrict wiring to shaded area.

Fig. 6. Wiring connections.

M12580

FAN OPERATION

(

FUEL

)

SWITCH

KEEP WIRING IN

SHADED AREA

MOUNTING

SCREW HOLE

MOUNTING

SCREW HOLE

WIRING ENTRANCE

HOLE

M14286

TERMINAL

SCREW

M14287

FOR STRAIGHT INSERTION

STRIP 5/16 IN. (8 MM)

FOR WRAPAROUND

STRIP 7/16 IN. (11 MM)

T8401C ELECTRONIC THERMOSTATS

69-1483—1 4

Fig. 7. T8401 with TotalZone or MABS EZ control

panels (all zones)

Fig. 8. T8401 with MM-2 or MM-3 panels (zone one).

Fig. 9. T8401 with MABS II and MABS IIL control

panel (zone one).

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.

See Fig. 10.

Fig. 10. Mounting thermostat to wallplate.

Removing Thermostat from Wallplate

1. Pull the lower edge of the thermostat away from

the wall.

2. Swing the thermostat up and remove the wallplate.

M14288

W2 L G Y R W M6 M4 M1

T8401 THERMOSTAT

TOTAL ZONE MABS EZ PANEL

THERMOSTAT MOTOR

OBGYRWC

NO CONNECTION

M14289

O1 G1 B1 T6/Y T5/R T4/W M1 M4 M6

T8401 THERMOSTAT

MM-2 OR MM-3 CONTROL PANEL

NO CONNECTION

TO T8401

THERMOSTAT

(ZONE 1)

CHANGEOVER

CONTROL

DAMPER MOTOR

(ZONE 1)

OG BY RW C

M14290

O1 G1 B1 T6 T5 T4 M1 M4 M6

T8401 THERMOSTAT

MABS II OR MABS IIL CONTROL PANEL

NO CONNECTION

TO T8401

THERMOSTAT

(ZONE 1)

CHANGEOVER

CONTROL

DAMPER MOTOR

(ZONE 1)

OG BY RW C

M14292

SYSTEM

Cool Off Heat

Auto On

FAN

DASHED LINES INDICATE TABS

ON BACK OF THERMOSTAT

SYSTEM

Cool Off Heat

Auto On

FAN

ENGAGE TABS AT TOP OF THERMOSTAT

WITH SLOTS ON MOUNTING PLATE.

PRESS LOWER EDGE OF

CASE TO LATCH.

Set Room

T8401C ELECTRONIC THERMOSTATS

5 69-1483—1

SETTINGS AND ADJUSTMENTS

Setting FAN and SYSTEM Switches

Fan and system settings are controlled manually by

using the switches located at the bottom of the

thermostat case. See Fig. 11.

Fig. 11. Digital Display and System Switches.

FAN Switch

Fan switch settings are:

On: The fan runs continuously. Use for improved air

circulation and air quality.

Auto: Normal setting for most homes. In cooling, the

fan starts and stops with the cooling equipment. In

heating, the fan is controlled directly by the heating

equipment and may start a few minutes after the

heating equipment turns on (on most systems). In

electric heat applications, the zone panel can be

configured to turn the fan on when the thermostat

calls for heat.

Slide the FAN switch in the bottom left corner of the

thermostat to select the desired fan setting.

SYSTEM Switch

System switch settings control thermostat operation as

follows:

Cool: The thermostat controls the cooling system. The

O terminal is energized.

Off: Both heating and cooling are off. O and B termi-

nals are de-engergized.

Heat: The thermostat controls the heating system.

The B terminal is energized.

Slide the SYSTEM switch in the bottom right corner of

the thermostat to select the desired system setting.

Set Temperature Setpoint

NOTE: NOTE: Temperature setpoint range is 40° to

99°F (5° to 37°C).

The temperature setpoint and the room temperature are

shown separately on the digital display. The ▼indicator

points to Set when the temperature setpoint is displayed

and to Room when the room temperature is displayed.

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. 11.

2. To display the temperature setpoint on the digital

display, press either the ▲or ▼key once. The

temperature setpoint is displayed for approximately

five seconds as the indicator points to Set and

flashes.

3. To decrease the temperature setpoint press the ▲

key. Each press changes the setpoint one degree;

press and hold to change the setpoint several

degrees.

4. To increase the temperature setpoint press the ▼

key. Each press changes the setpoint one degree;

press and hold to change the setpoint several

degrees.

Setting °F/°C Indication and Heat Cycle Rate

NOTE: NOTE: To save changes to the °F/°C indication

and the heat cycle rate, all seven steps must be

completed.

To set the °F/°C indication and heat cycle rate:

1. If the temperature is displayed in °F, set the tem-

perature setpoint to 52°F. If the room temperature

is displayed in °C, set the temperature setpoint to

11°C.

SYSTEM

Cool Off Heat

Auto On

FAN

M14293

TEMPERATURE DISPLAY

INCREASE SETTING

DECREASE SETTING

FAN SWITCH

SYSTEM SWITCH

Set Room

INDICATOR

ROOM TEMPERATURE

SETPOINT TEMPERATURE

M14679

M14680

M14681

M14682

M14683

T8401C ELECTRONIC THERMOSTATS

69-1483—1 6

Optional System Checkout

When in steps 2 and 3 only, the ▼key can be used to

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.

Examples: System setting at HEAT: If heat is on, the

▼key turns it off; if heat is off, ▼turns it on.

System setting at COOL: If cool is on, ▼key turns it

off; if cool is off, ▼turns it on.

2. Press the ▲▼ keys simultaneously for more than

one second to light all segments on display and to

enter installer setup mode. When the keys are

released, a two-digit software revision code is dis-

played.

NOTE: NOTE: In installer setup mode only, each press

of the ▲key momentarily displays 01. Each

press of the ▼key momentarily displays 02.

When the keys are released, these two-digit

codes are no longer displayed.

3. Press the ▲key. Factory information is displayed.

A typical example is shown, but information dis-

played varies by model. This information is for fac-

tory use only.

4. Press the ▲key again to display °C or °F.

5. Press the ▼key to change the °C or °F indication.

6. Press the ▲key to display the heat cycle rate of 1,

3, 4, 5, 6, 9, or 12. If the desired cycle rate is dis-

played, press the ▲key to exit the installer setup

mode. To change the heat cycle rate, press the ▼

key to scroll between 1, 3, 4, 5, 6, 9, and 12. Stop

scrolling when the desired cycle rate is displayed.

See Table 3 for the cycle rate options and the cor-

responding system equipment.

Table 3. Heating Cycle Rates.

a High Efficiency Furnace.

b Refer to equipment manufacturer’s instructions.

NOTE: NOTE: Steps 7 and 8 are available on select

models.

7. Press the ▲key to display cooling algorithm con-

figuration default.

8. Press the ▲key again to change cooling algorithm

to C1 or C3.

C1 = Standard cooling algorithm.

C3 = Aggressive cooling algorithm (can cause

overshooting).

9. Press the ▲key again. Current configuration (CC)

is displayed. A typical example is shown, but CC

varies by model.

10. Press the ▲key to save all changes, exit installer

setup mode and return to normal operation.

NOTE: After exiting installer setup mode, change the

setpoint to the desired room temperature.

CHECKOUT

Heating

1. Slide the SYSTEM switch to Heat and the FAN

switch to Auto.

2. Press and hold the ▲key to raise the temperature

setting several degrees above the room tempera-

ture. After approximately ten seconds, the heating

equipment should start. In conventional systems,

the system turns on the fan through the use of a

M14684

M14685

M14686

M14687

M14688

M14689

System Cycles Per Hour

Steam, Gravity 1

Hydronic Heat, Condensing

Gas

Furnacesa

Gas or Oil Forced Air 6

Electric Heat 9

Special Applicationsb12

M14690

M18419A

T8401C ELECTRONIC THERMOSTATS

7 69-1483—1

Cooling

NOTE: To bypass the 5 minute delay, see optional sys-

tem checkout on page 6.

CAUTION

Low Temperature Hazard.

Operating at too low of an outdoor

temperature may cause compressor damage.

Do not operate cooling if outdoor temperature is

below 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.

1. Slide the SYSTEM switch to Cool and the FAN

switch to Auto.

2. Press the ▼key to lower the temperature setting

several degrees below the room temperature. After

approximately five minutes, the cooling equipment

should start. The fan starts and stops with the cool-

ing equipment.

3. Press the ▲key to raise the temperature setting

above the room temperature. Cooling system

should shut down.

Fan

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

controlled directly by the heating equipment and

may start a few minutes after the heating equip-

ment turns on (on most systems). When using an

electric heat thermostat, the fan starts and stops

with the heating equipment. In cooling, the fan

starts and stops with the cooling equipment.

Consult the instructions provided with The Zone Panel to

troubleshoot system problems. Refer to Table 4 for the

thermostat’s Sequence of Operations.

Table 4. Thermostat Sequence of Operations.

Fan Selection System Selection Call Energize Display

Auto Off None None None

On Off None G None

Auto Cool None O None

Auto Cool Snowflake Symbol O, G, Y Snowflake Symbol

Auto Heat None B None

Auto Heat Flame symbol B, W* Flame symbol

*If fan operation (fuel) switch is in E position, G terminal is also energized.

69-1483—1 G.H. Rev. 2-02 www.honeywell.com/yourhome

T8401C ELECTRONIC THERMOSTATS

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