Honeywell T841A Manual de usuario

X-XX UL

INSTALLATION INSTRUCTIONS

®U.S. Registered Trademark

69-1083

SUPER TRADELINE

Model LEDs Changeover Heat

Anticipation Terminal

Designations SYSTEM

Switch Auto Fan in

EM. HEAT Remarks

T841A EM. HEATa,

AUX. HEAT Manual Cool

or Heat Stage Two

Adjustable W3,O,G,R,E,

X,W2,B,Y

EM. HEAT,

HEAT, OFF,

COOL

Yes Replaces

most T841As.

aEM. HEAT LED also indicates compressor malfunction.

MOUNTING

HOLES (4) WIRING TERMINAL (UP TO 12)

M12193

BACK OF DEVICE

EM. HEAT HEAT OFF COOL

AUTO ON

FAN

EM. HEAT AUX. HEAT

FRONT OF DEVICE

FAN

SWITCH

SYSTEM

SWITCH

COVER

THERMOMETER

SETPOINT

SCALE

LEDS

HEAT PUMP THERMOSTAT

T841A Heating-Cooling

Heat Pump Thermostat

APPLICATION

The T841A Heating-Cooling SUPER TRADELINE®

Thermostat provides 24 Vac control of two-stage heating

and one-stage cooling in heat pump systems, using

manual changeover. This thermostat provides SYSTEM

switch selections of EM. HEAT-HEAT-OFF-COOL and

FAN switch selections of AUTO-ON. See Fig. 1. The

adjustable second stage heat anticipator allows replace-

ment of most T841A models. See Table 1 for T841A

SUPER TRADELINE® specifications.

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, which are labeled to

correspond with the terminals on the back of the thermo-

stat.

Table 1. T841A SUPER TRADELINE® Specifications.

Fig. 1. External view of T841A.

69-1083 2

T841A HEATING-COOLING HEAT PUMP THERMOSTAT

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 1°F is the

interstage differen-

tial

The LED indicators on certain thermostat models light up

when something specific happens within the system.

When the green or amber LED lights, the auxiliary heat

(second stage heat) is operating because the weather is

so cold, the heat pump alone cannot handle the load.

When the red EM. HEAT LED lights, the emergency heat

is operating (usually electric strip heaters), because the

homeowner has physically switched to the EM. HEAT

position. See heating/cooling manufacturer instructions for

specific meaning.

RECYCLING 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.

Contact your local waste management authority for

instructions regarding recycling and the proper

disposal of this control, or any 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

1. Disconnect power supply to prevent electrical

shock or equipment damage.

2. To prevent interference with the thermostat

linkage, keep wire length to a minimum and

run wires as close as possible to the subbase.

3. Do not overtighten the thermostat captive

mounting screws, because damage to the

subbase threads can result.

4. Do not short across coil terminals on the relay.

This can burn out the thermostat heat

anticipator.

5. Never install more than one wire per terminal

unless a factory-supplied jumper with spade

terminal is used.

Location

Locate the thermostat about 5 ft (1.5m) above the floor in

an area with good air circulation at average room tempera-

ture.

Do not mount 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 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 and Wiring

CAUTION

Disconnect power supply before beginning

installation. Can cause electrical shock or

equipment damage.

The T841A can be mounted directly to a wall or horizontal

outlet box. Choose the method that best fits your installa-

tion.

In replacement applications, check the existing thermostat

wires for cracked or frayed insulation. Replace wires in

poor condition.

All wiring must comply with local codes and ordinances.

69-1083

T841A HEATING-COOLING HEAT PUMP THERMOSTAT

Grasp the thermostat cover at the top and bottom with one

hand. Pull outward on the bottom edge of the cover until it

snaps free of the thermostat base. Carefully remove and

save the packing material surrounding the mercury

switches.

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

wiring is plastered into the wall, make a hole next to

the cable and loosen the wires so that they can be

pushed back into the wall later. Thread the wires

through the hole in the packing material saved

above. Connect the wires to the terminals on the

back of the thermostat. See Fig. 2.

2. Set the second stage adjustable heat anticipator to

match the current draw of the primary heating

control (see Heat Anticipator Setting section).

3. Push the excess wire back through the hole and

plug any opening with packing material to prevent

drafts that may affect thermostat performance.

4. Use screws to loosely secure the thermostat to the

wall or outlet box through the two mounting holes in

the middle of the device.

The sheetmetal screws included with the thermostat are

designed for use in plaster walls that do not need anchors.

IMPORTANT

An incorrectly leveled subbase causes inaccurate

temperature control.

5. Level the thermostat using a spirit level or plumb

line. Tighten the two mounting screws at the middle

of the device.

6. Install the two screws in the top mounting holes and

tighten.

7. Replace the thermostat cover.

SETTINGS

Heat Anticipator Setting

The second stage heat anticipator is adjustable. Move the

adjustable indicator to match the current draw of the

second stage heating primary control, or the anticipator

setting of the old thermostat. See Fig. 3.

Temperature Setting

Move the setpoint lever to the desired control point on the

temperature scale.

SYSTEM Switch Setting

The SYSTEM switch positions control the system opera-

tion as follows:

EM. HEAT: Emergency heat relay is energized. Cooling

system is off. Compressor is deenergized. Fan runs

on call for heat if FAN switch is in the AUTO

position. EM. HEAT 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 at 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

AUTO: Fan operates in response to thermostat in both

heating and cooling.

ON: Fan operates continuously.

(HOT) L2

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

H2 H2

ANTICIPATOR

FALL

H1 ANTICIPATOR

C1 ANTICIPATOR

SYSTEM

SWITCH

HEAT

OFF

COOL

FAN SWITCH

AUTO

EM. HT.

COMPRESSOR

CONTACTOR

FAN RELAY

HEAT

RELAY

EM. HT.

RELAY

EM. HT.

LED (RED)

CHANGEOVER

RELAY (HEAT)

AUX. HT.

LED (GREEN)

CHANGEOVER

RELAY (COOL)

AUX. HT.

RELAY

M12195

Fig. 2. Internal schematic and typical wiring diagram for SUPER TRADELINE® T841A with AUX. HEAT, EM. HEAT

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

69-1083 4

T841A HEATING-COOLING HEAT PUMP THERMOSTAT

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

Scarborough, Ontario M1V 4Z9

69-1083 J.S. 2-97

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Minneapolis, MN 554422-4386

Fig. 3. Second stage adjustable heat anticipator

indicator.

CHECKOUT

Heating

Move the SYSTEM switch on the thermostat to HEAT and

the FAN switch to AUTO. Move the 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.

1.2

.8.6 .4

.15

.12

.10

EM.HT. HEAT OFF COOL

MOVE INDICATOR

TO MATCH CURRENT

RATING OF

PRIMARY CONTROL M12194

LONGER

NOTE: To prevent compressor short cycling, a minimum-

off timer may be included to prevent the com-

pressor from starting for up to five minutes from

when the thermostat last turned the compressor

off, or from when the system first received power.

Cooling

CAUTION

Do not operate cooling if outdoor temperature is

below 50°F (10°C). Refer to manufacturer recom-

mendations.

Move the SYSTEM switch on the thermostat to COOL and

the FAN switch to AUTO. Move the setpoint lever about

10°F (6°C) below the room temperature. Cooling and fan

should start. Move the setpoint lever about 10°F (6°C)

above the room temperature. Cooling and fan should shut

off.

Fan

Move the SYSTEM switch to OFF, and the FAN switch to

ON. The fan should run continuously. Move the FAN

switch to AUTO. In this position, the fan operates in

response to the thermostat in both heating and cooling.

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