Honeywell TRADELINE T8400C Bedienungsanleitung

®U.S. Registered Trademark

INSTALLATION INSTRUCTIONS

T8400B,C; T8401C

Electronic Thermostats

T8400B Thermostat provides single-stage, non-

programmable temperature control for 24V heat-only

applications. Heating cycle rate is selectable at 1, 3, 4,

5, 6, 9, or 12 cph. Temperature indication can be set for

°F or °C.

The T8400B Thermostat is powered through the heating

system controls.

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, 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 Thermo-

stat is powered directly from the system transformer.

Batteries are not required because setpoints are held

permanently by nonvolatile memory for all models.

All models include a thermostat, wallplate (for wiring

and mounting thermostat) and Owner’s Guide. Two

decorator cover plates (for covering wall marks) are

included for select models.

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

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

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 tempera-

ture. 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.

69-1494-1

69-1494–1 2

T8400B,C;T8401C ELECTRONIC THERMOSTATS

Fig. 1. Typical location of thermostat.

Fig. 2. Mounting decorator cover plate

and wallplate to wall.

Mounting Wallplate and Decorator Cover

Plate (Select Models) to Wall

IMPORTANT

Level only for appearance. The thermostat

functions normally even when not level.

NOTE: All models include a thermostat, wallplate (for

wiring and mounting thermostat) and Owner’s

Guide. Two decorator cover plates (to cover

wall marks) are included for select models.

Mount wallplate and decorator cover plate (select

models) as follows (see Fig. 2):

1. Place the desired decorator cover plate and the

wallplate at the desired location on the wall.

2. Pull the thermostat wire through the entrance hole

on the decorator cover plate, then through the

wallplate entrance hole.

3. Select the two mounting holes that best fit the

application.

4. Fasten the decorator cover plate and 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.

5 FEET

[1.5 METERS]

YES

M10308

M11041C

WALL

3-7/8 IN. x 3-7/8 IN.DECORATOR COVER PLATE (SELECT MODELS).

DRILL 3/16 INCH HOLES (IF DRYWALL) OR 7/32 (PLASTER OR WOOD)

WHEN USING WALL ANCHORS.

5-3/4 IN. x 5-3/4 IN.

DECORATOR

COVER PLATE

WALL

ANCHORS (2)

69-1494–1

T8400B,C;T8401C ELECTRONIC THERMOSTATS

Wiring

IMPORTANT

Use an 18-gauge maximum wire for wiring the

T8400B,C and T8401C Thermostats.

All wiring must comply with local electrical codes and

ordinances. Disconnect the power supply to prevent

electrical shock or equipment damage.

NOTE: To ensure proper mounting of thermostat,

restrict all wiring to the shaded area on the left

side of the terminals. See Fig. 3.

The T8400B Thermostat is powered through the heating

system control. The T8400B is adaptable to most 2-wire

and 3-wire 18 to 30 Vac heating systems. Refer to Fig. 5

and 6 for typical wiring hookups.

Fig. 3. Restrict wiring to shaded area.

The shape of the terminals permits insertion of straight

or wraparound wiring connections; either method is

acceptable. See Fig. 4.

M11023

ALTERNATE

MOUNTING

SCREW HOL

MOUNTING

SCREW

HOLE

MOUNTING

SCREW HOLE

ALTERNATE MOUNTING

SCREW HOLE

KEEP WIRING IN

SHADED AREA

WIRING ENTRANCE HOLE

Fig. 4. Wiring connections.

M11232

FOR WRAPAROUND

STRIP 7/16 IN. (11 MM

)

FOR STRAIGHT INSERTIO

STRIP 5/16 IN. (8 MM)

TERMINAL SCREW

Fig. 5. T8400B heat-only wiring diagram in a single

transformer system with gas heat.

(

HOT)

RFAN

RELAY

HEATING

PRIMARY

CONTROL

24V

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

M10973

T8400B

Fig. 6. T8400B heat-only wiring diagram in a single

transformer system with gas heat.

The T8400C Thermostat is powered through the

heating/cooling system controls and is adaptable to

most 4-wire, 18 to 30 Vac heating-cooling systems.

The T8401C Thermostat is powered directly from the

system transformer and is adaptable to most 5-wire, 18

to 30 Vac heating-cooling systems. Refer to Fig. 7 and 8

for typical wiring hookups.

(

HOT)

RHEAT

PRIMARY

CONTROL

24V

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED. M1097

T8400B

69-1494–1 4

T8400B,C;T8401C ELECTRONIC THERMOSTATS

Fig. 7. T8400C/T8401C heat-cool wiring

diagram in single transformer system

with gas heat/electric cooling.

Fig. 9. Mounting thermostat to wallplate.

T8400C shown here.

OPERATION

Setting FAN and SYSTEM Switches

Fan and system settings are controlled manually by

using the switches located at the bottom of the thermo-

stat case. See Fig. 10.

NOTE: Switch availability is model dependent.

Fig. 8. T8400C/T8401C heat-cool wiring

diagram in oil heating/electric cooling system.

Oil primary has its own transformer.

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. 9.

M11025B

FAN SYSTEM

Auto On Cool Off Heat

DASHED LINES INDICATE TABS

ON BACK OFTHERMOSTAT

FAN SYSTEM

Auto Cool Off Heat

ENGAGE TABS AT TOP

OF THERMOSTAT WITH

SLOTS ON WALLPLATE.

PRESS LOWER EDGE OF

CASE TO LATCH.

Set Room

FAN SYSTEM

Auto On Cool Off Heat

INCREASE

SETTING

DECREASE

SETTING

SYSTEM SWITCH

FAN SWITCH

TEMPERATURE DISPLAY

M11020

Set Room

Fig. 10. T8400C Digital Display and Switches.

FAN Switch (Not Available on all Models)

Fan switch settings are:

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). When using an electric heat thermostat,

the fan starts and stops with the heating equip-

ment.

On: The fan runs continuously. Use for improved air

circulation and air quality.

Slide the switch in the bottom left corner of the thermo-

stat to select the desired fan setting.

(HOT)

COOLING

CONTACTOR

FAN

RELAY

HEATING

PRIMARY

CONTROL

24V

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

IN T8401C INSTALLATIONS ONLY, CONNECT C TERMINAL.

M1097

T8400C, T8401C

(HOT)

COOLING

CONTACTOR

FAN

RELAY

OIL PRIMARY

CONTROL

24V

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

IN T8401C INSTALLATIONS ONLY, CONNECT C TERMINAL.

M10978

T8400C, T8401C

69-1494–1

T8400B,C;T8401C ELECTRONIC THERMOSTATS

SYSTEM Switch

System switch settings control thermostat operation as

follows:

Cool: The thermostat controls the cooling system.

Off: Heating and cooling are off.

Heat: The thermostat controls the heating system.

NOTE: Cool Setting availability is model dependent.

Slide the switch in the bottom right corner of the

thermostat to select the desired system setting.

Set Temperature Setpoint

NOTE: Temperature setpoint range is 40°to 99°F

(5°to 37°C).

The setpoint temperature and the room temperature are

shown separately on the digital display. The ▼ indicator

points to Set when the setpoint temperature is dis-

played and to Room when the room temperature is

displayed.

Setting

C Indication and Heat Cycle Rate

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

setpoint temperature to 52°F. If the room tem-

perature is displayed in °C, set the setpoint

temperature to 11°C.

To set setpoint temperature:

1. Select Heat or Cool by sliding the system switch

in the lower right corner of the thermostat to the

desired mode. See Fig. 10.

2. To display the setpoint temperature on the digital

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

setpoint temperature is displayed for approxi-

mately five seconds as the indicator points to Set

and flashes.

3. To increase the setpoint temperature, press the ▲

key. Each press changes the setpoint one degree;

press and hold to change the setpoint several

degrees.

Optional System Checkout

When in steps 2and 3only, 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.

NOTE: The COOL setting is not available on all

models.

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

displayed.

4. To decrease the setpoint temperature, press the

▼key. Each press changes the setpoint one

degree; press and hold to change the setpoint

several degrees.

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.

M1468

et Room

INDICATOR

ROOM TEMPERATURE

SETPOINT TEMPERATURE

M1467

M1468

69-1494–1 6

T8400B,C;T8401C ELECTRONIC THERMOSTATS

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

A typical example is shown, but information

displayed varies by model. This information is for

factory use only.

CHECKOUT

Heating

1. Slide the SYSTEM switch to Heat. Slide the FAN

switch to Auto, if available.

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

time delay relay or through a limit control. When

using an electric heat thermostat, the fan starts

immediately.

3. Press the ▼ key to lower the temperature setting

below the room temperature. Heating equipment

should stop.

Cooling (Not Available on all Models)

CAUTION

Low Temperature Hazard.

Operating at too low of an outdoor tempera-

ture may cause compressor damage.

Do not operate cooling if outdoor temperature is

below 50°F (10°C). Refer to equipment manu-

facturer’s recommendations.

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 cooling equipment.

3. Press the ▲ key to raise the temperature setting

above the room temperature. Cooling system

should shut down.

Fan (Not Available on all Models)

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 (for 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.

Make certain all equipment responds properly to the

thermostat.

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 is

displayed, 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 rate is

displayed. See Table 1 for the cycle rate options

and the corresponding system equipment.

Table 1. Heating Cycle Rates.

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

7. Press the ▲ key to display cooling algorithm

configuration default.

System Cycles Per Hour

Steam, Gravity 1

Hydronic Heat, Condensing Gas

Furnaces

Gas or Oil Forced Air 6

Electric Heat 9

Special Applications

High Efficiency Furnace.

Refer to the equipment manufacturer’s Instructions.

M1469

M1468

M1841

8. Press the ▲ key to change cooling algorithm to

C1 or C3.

C1 = Standard cooling algorithm.

C3 = Aggressive cooling algorithm (can cause

overshooting).

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

setup mode and return to normal operation.

4, 5, 12

69-1494–1

T8400B,C;T8401C ELECTRONIC THERMOSTATS

69-1494–1 G.H. Rev. 2-02 Printed in Mexico www.honeywell.com/yourhome

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

Scarborough, Ontario

M1V 4Z9

Automation and Control Solutions

Honeywell

1985 Douglas Drive North

Golden Valley, MN 55422

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