Honeywell T841A Manual de usuario

® U.S. Registered Trademark

INSTALLATION INSTRUCTIONS

69-1043-2

TRADELINE®

T841A,B Easy-To-See™

Heat Pump Thermostat

APPLICATION

The T841A, B Easy-to-See™ Heat Pump Thermostat

provides 24 Vac control of 2-stage heating and 1-stage

cooling in heat pump systems, using manual change-

over.

The T841A Thermostat provides EM. HT.-HEAT-OFF-

COOL System switching and AUTO-ON Fan switching.

The T841B Thermostat provides HEAT-OFF-COOL

System switching and AUTO-ON Fan switching.

The side of the thermostat features raised numbers for

easy temperature setting by touch or sight. An audible

click is heard with indents every two degrees as the

temperature setpoint lever is moved. The thermostat

wallplate features raised letters to aid in setting System

switch and Fan switch settings. See Fig. 1.

The T841A,B includes a thermostat and wallplate.

Test holes are provided on the front of the thermostat to

accommodate test meter probes without removing the

thermostat from the wall. Remove the cover of the

thermostat to expose the test holes that are labeled to

correspond with the terminals on the thermostat back.

OPERATION

The stages of heat make sequentially as the temperature

drops. Make refers to the mercury switch initiating a call

for heat or cool.

There is about 1°F (0.6°C) between stages so the

second stage (auxiliary heat) makes only when the first

stage cannot handle the load. This °F is the interstage

differential.

For T841A Thermostat only (not for T841B Thermostat):

light emitting diode (LED) indicators light when

something specific happens within the system:

When AUX. HT. green or amber LED lights, auxiliary

heat (second stage heat) is operating because the

weather is so cold, the heat pump alone cannot

handle the load.

When red EM. HT. LED lights, emergency heat is

operating (electric strip heaters), because home-

owner physically switched to EM. HT. position. See

heating/cooling manufacturer instructions.

MERCURY NOTICE

This control contains mercury in a sealed tube.

Do not place the control in the trash at the end of

its useful life. If this control is replacing a control

that contains mercury in a sealed tube, do not

place your old control in the trash.

Contract your local waste management authority

for instructions regarding recycling and the

proper disposal of this control, or 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 technician.

4. After installation is complete, check out product

operation as provided in these instructions.

CAUTION

Electrical Hazard.

Can cause Disconnect electrical shock or

equipment damage.

Disconnect power before beginning installation.

IMPORTANT

— To prevent interference with the thermostat link-

age, keep wire length to a minimum and run

wires as close as possible to the thermostat

base.

— Do not short across coil terminals on the relay.

This can burn out thermostat heat anticipator.

— Never install more than one wire per terminal

unless a factory-supplied jumper with a spade

terminal is used.

HEAT PUMP THERMOSTAT

69-1043-2 2

Location

Locate the thermostat between 4 ft (1.2m) and 5 ft (1.5m)

above the floor in an area with good air circulation at

average room temperature.

NOTE: Because of height restrictions of some disabled

users, it may be necessary to lower the thermo-

stat location to 4 ft (1.2m) above the floor.

Do not install 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 sun, appliances or fireplaces.

— 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

The T841A,B can be mounted directly on a wall or a

horizontal outlet box. Choose the method that best fits

your installation. In replacement applications, check the

existing thermostat wires for cracked or frayed insulation.

Replace any wires in poor condition.

To remove the thermostat cover:

1. Grasp thermostat cover at the top and bottom with

one hand.

2. Pull outward on the bottom edge of the cover until

it snaps free of the thermostat base.

3. Carefully remove and save the packing material

surrounding the mercury switches.

Wiring

All wiring must comply with local codes and ordinances.

Follow equipment manufacturer wiring instructions when

available.

NOTE: Four screws are provided with the thermostat;

only two are required for mounting.

1. Run wiring (if necessary) to the location. If wiring is

plastered into the wall, make a hole next to the wire

and loosen the wires so they can be pushed back

into the wall later.

2. Thread the wires through the hole.

3. Pull the wires through the entrance hole on the

wallplate.

4. Connect the wires to the terminals on the back of

the thermostat. See Fig. 1-3.

5. Push the excess wire back through the hole and

plug any openings with packing material to prevent

drafts that can affect thermostat performance.

6. Use two of the four screws provided to loosely

secure the thermostat and the wallplate to the wall

or outlet box through the two middle mounting

holes. See Fig. 1.

NOTE: The sheet metal screws included with the ther-

mostat are designed for use in plaster walls that

do not need anchors.

IMPORTANT

An incorrectly leveled thermostat causes inac-

curate temperature control.

7. Exactly level the thermostat using a spirit level or

plumb line.

8. Tighten the screws in the middle mounting holes.

9. Replace the thermostat cover.

Fig. 1. Mounting thermostat to wallplate (T841A model shown).

WALLPLATE

T841 BASE

MOUNTING

SCREWS (2)

T841 COVER

M11427

TEMPERATURE

SETPOINT LEVER

EH H O C

A O

SETPOINT

SCALE

EM. HEAT

LED

AUX. HEAT

LED

FAN SWITCH

SYSTEM SWITCH

MOUNTING

HOLES (4)

WIRING TERMINAL

(UP TO 12)

BACK OF DEVICE

HEAT PUMP THERMOSTAT

EM. HEAT HEAT OFF COOL AUTO ON

FAN

HEAT PUMP THERMOSTAT

3 69-1043-2

Fig. 2. Internal schematic and typical wiring diagram for T841A with AUX. HT. and EM. HT. LEDs. Provides heat

or cool changeover relay control and automatic fan in emergency heat mode.

Fig. 3. Internal schematic and typical wiring diagram for T841B 2-stage heat, 1-stage cool, manual changeover.

(HOT) L

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

REMOVEW1-Y1 JUMPER WHEN HEAT RELAY 1 IS USED.

WHEN L TERMINAL IS CONNECTEDTO SYSTEM MONITOR, EM. HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION.

X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION.

H2 ANTICIPATOR

FALL

H1 C1 FALL

H1 ANTICIPATOR

C1 ANTICIPATOR

SYSTEM

SWITCH

HEAT

OFF

COOL

FAN SWITCH

AUTO

EM. HT.

COMPRESSOR

CONTACTOR

FAN RELAY

EM. HT.

RELAY

EM. HT.

LED (RED)

CHANGEOVER

RELAY (HEAT)

AUX. HT.

LED (GREEN)

HEAT RELAY 1

CHANGEOVER

RELAY (COOL)

AUX. HT.

RELAY

JUMPER

SYSTEM

MONITOR

M1103

H2 FALL

FALL

(HO

L2 1

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

H1/C1

ANTICIPATOR

H2 ANTICIPATOR

SYSTEM

SWITCH

COOL

OFF

HEAT

COOL CHANGEOVER VALVE

COMPRESSOR

CONTACTOR

FAN RELAY

HEAT CHANGEOVER

VALVE

HEAT RELAY 1

HEAT RELAY 2

FAN SWITCH

AUTO

M6068A

69-1043-2 G.H. Rev. 3-03 www.honeywell.com/yourhome

HEAT PUMP THERMOSTAT

Printed in U.S.A. on recycled

paper containing at least 10%

post-consumer paper fibers.

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

SETTINGS

Temperature Setting

The enlarged, raised numbers on the right edge of the

thermostat can be used for easy temperature setting by

touch or sight while moving the temperature setpoint

lever to the desired temperature setting. The large 5, 6, 7

and 8 refer to 50°F (10°C), 60°F (16°C), 70°F (21°C) and

80°F (27°C), respectively. A click is heard with indents

every two degrees as the temperature setpoint lever is

moved. See Fig. 1.

System Switch Setting

The enlarged, raised letters on the left bottom edge of the

wallplate can be used for easy recognition of System

switch settings:

For the T841A Thermostat: The large EH, H, O and C

refer to EM. HT., HEAT, OFF and COOL.

For the T841B Thermostat: The large H, O and C refer

to EM. HT., HEAT, OFF and COOL.

The System switch settings control the system operation

as follows:

EM.HT (only on T841A): Emergency heat relay is

energized. Cooling system is off. Compressor is

de-energized. Fan runs on call for heat if the Fan

switch is in the AUTO position. EM. HT. LED is on.

HEAT: Heating system is automatically controlled by

the thermostat. Cooling system is off.

OFF: Both the heating and cooling systems are off. If

the fan is set to the AUTO position, the cooling fan

is also off.

COOL: Cooling system is automatically controlled by

the thermostat. Heating system is off.

Fan Switch Setting

On theT841A,B, large A, O raised letters on the right

bottom edge of the wallplate refer to AUTO and ON fan

settings. The Fan switch settings control the fan as

follows:

AUTO: Fan operates in response to thermostat in both

heating and cooling.

ON: Fan operates continuously.

CHECKOUT

Heating

Move the System switch on the thermostat to HEAT and

the Fan switch to AUTO. Move the temperature setpoint

lever to about 10°F (6°C) above the room temperature.

Heating should start and the fan should run. Move the

setpoint lever about 10°F (6°C) below the room

temperature. Heating and fan should shut off.

IMPORTANT

To prevent compressor short cycling, a mini-

mum-off timer can be included to prevent the

compressor from starting for up to five minutes

from when the thermostat last turned off the

compressor, or from when the system first

received power.

Cooling

CAUTION

Compressor Damage Hazard.

Operating cooling equipment in cold weather

can damage compressor.

Do not operate air conditioner if outdoor

temperature is below 50°F (10°C).

Move the System switch on the thermostat to COOL and

the Fan switch to AUTO. Move the temperature setpoint

lever about 10°F (6°C) below the room temperature.

Cooling and fan should start (see Note in Checkout

section). Move the setpoint lever about 10°F (6°C) above

the room temperature. Cooling and fan should shut off.

Fan

Move System switch to OFF, and Fan switch to ON. The

fan should run continuously. Move Fan switch to AUTO.

In this position, the fan operates in response to the

thermostat in both heating and cooling.

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