Lux TX250 User Manual

HEAT

OFF

COOL

INSTALLATION AND OPERATING INSTRUCTIONS

OFF

TX250 SERIES

SMART TEMP

ELECTRONIC THERMOSTAT

Easy as

CAUTION

• Your thermostat is a precision instrument. Please handle it with care.

• Turn off electricity to the appliance before installing or servicing thermostat or any part of the system. Do not turn electricity back on until work is completed.

• Do not short (jumper) across electric terminals at control on furnace or air conditioner to test the system. This will damage the thermostat and void your warranty.

• All wiring must conform to local codes and ordinances.

• This thermostat is designed for use with 24 volt and millivolt systems. The thermostat should be limited to a maximum of 1.0 amps; higher amperage may cause damage to the thermostat. If you are in doubt, call your utility company.

Installs Easily

Complete, Easy To Read Programming And Installation Instructions Inside

LUX PRODUCTS CORPORATION • Philadelphia, PA 19112 43374

WARNING: Use Energizer® or DURACELL® Alkaline Batteries Only.

Energizer® is a registered trademark of Eveready Battery Company, Inc.

DURACELL® is a registered trademark of The Gillette Company, Inc.

Choose Heat or CoolSet Day & Time

1–2–3

IMPORTANT!

READ

INSTALLATION

INSTRUCTIONS

FIRST

These instructions may contain information beyond that required for your particular installation.

Please save for future reference.

FEATURES

• The TX250 can be used with most 24 volt gas, oil or electric heating and air conditioning systems, singlestage heat pumps or gas millivolt heating systems.

It cannot be used with 120 volt heating systems or multistage heat pumps. Ask your dealer for other LUX thermostats to control those systems.

• The TX250 is programmable.

There are four programming periods per day. Each period can be programmed separately.

• Easy to use Speed Slide.

• You can use the built-in time/temperature programs, or alter them to suit your schedule. The TX250 provides separate programming for weekdays and weekends

— for both heating and cooling. You can override the programmed temperatures for as little as one programming period or for an entire vacation.

• In cool weather, when the system switch is set to HEAT, the TX250 may maintain cooler “set back” room temperatures to save energy. It will then change to warmer “comfort” settings — automatically, at specified times during the day.

• In warm weather, when the system switch is set to COOL, the TX250 may maintain warmer “set back” room temperatures to save energy. It will then change to cooler “comfort” settings — automatically, at specified times during the day.

• A liquid crystal display shows time, day of the week, and room and set temperatures.

• Temperature swing adjustment lets you fine-tune your system for maximum comfort and economy.

• A 2 or 5-minute minimum off time in COOL prevents your air conditioning system from being damaged.

• Two Energizer®or DURACELL® “AA” alkaline batteries (not included) are used to retain your time and temperature programs.

Thank you for your confidence in our product. To obtain the best results from your investment, please read these instructions and acquaint yourself with your purchase before installing your new thermostat. Then follow the installation procedures, one step at a time. This will save you time and minimize the chance of damaging the thermostat and the systems it controls.

Liquid Crystal

Thermostat

Body

Mode

Switch

Fan Switch

Separator

Tabs

Display

Speed

Slide

Reset

Button

INSTALLATION

Please read all instructions carefully before beginning installation.

TOOLS REQUIRED

#1 Phillips screwdriver (small) Drill with 3/16-in. (4.8mm) bit

CAUTION

To avoid electrical shock and to prevent damage to the furnace, air conditioner, and thermostat, disconnect the power supply before beginning work. This can be done at the fuse box, at the circuit breaker, or at the appliance.

THERMOSTAT LOCATION

On replacement installations, mount the new thermostat in place of the old one unless the conditions listed below suggest otherwise. On new installations, follow the guidelines listed below.

1. Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the floor, and in a room that is used often.

2. Do not install it where there are unusual heating conditions, such as: in direct sunlight; near a lamp, radio, television, radiator, register, or fireplace; near hot water pipes in a wall; near a stove on the other side of a wall.

3. Do not locate in unusual cooling conditions, such as: on a wall separating an unheated room; or in a draft from a stairwell, door, or window.

4. Do not locate in a damp area. This can lead to corrosion that will shorten thermostat life.

5. Do not locate where air circulation is poor, such as: in a corner or an alcove; or behind an open door.

6. Do not install the unit until all construction work and painting has been completed.

7. This thermostat does not require leveling.

REMOVING THE OLD THERMOSTAT

Switch electricity to the furnace and air conditioner OFF; then proceed with the following steps.

2. Note the letters printed near the terminals. Attach labels (enclosed) to each wire for identification. Remove and label wires one at a time. Make sure the

1. Remove cover from old thermostat. Most are snap-on types and simply pull off. Some have locking screws on the side. These must be loosened.

CAUTION

Read instructions carefully before removing any wiring from existing thermostat. Wires must be labeled before they are removed. When removing wires from their terminals, ignore the color of the wires since these may not comply with the standard.

wires do not fall back inside the wall.

3. Loosen all screws on the old thermostat and remove it from the wall.

MOUNTING THE TX250 ON THE WALL

1. Strip insulation 3/8 in. (9.5mm) from wire ends and clean off any corrosion.

2. Fill wall opening with

non-combustible insulation to prevent drafts from affecting

the thermostat.

3. Cup and hold thermostat body and left tab in place with left hand. Separarte tabs with right hand.

CAUTION

Be careful not to drop the body or disturb electronic parts.

Base

GYWRCRHOB

FAN RELAY

COOLING COMPRESSOR

HEATING CONTROL

COOL TRANSFER

HEATING TRANSFER

DAMPER OR CHANGEOVER

VALVE (Powered in Cool)

DAMPER OR CHANGEOVER

VALVE (Powered in Heat)

If replacing a Honeywell TM-11, tape off wire "R"; connect wire "B" to terminal "RH".

RCR RH

G F

4 H W

5 V

TAPE OFF

HEATING SYSTEMS

GYWRCRHOB

FAN RELAY

COOLING COMPRESSOR

HEATING CONTROL

COOL TRANSFER

HEATING TRANSFER

DAMPER OR CHANGEOVER

VALVE (Powered in Cool)

DAMPER OR CHANGEOVER

VALVE (Powered in Heat)

G F

C Y

V R

TAPE OFF

COOLING SYSTEMS

TAPE OFF

If both "Y" and "C" wire are present, tape off "C" wire.

If both "Y" and "C" wire are present, tape off "C" wire. If both "Y" and "C" wire are present, tape off "C" wire.

4- or 5-WIRE WITH ONE TRANSFORMER 5- or 6-WIRE WITH TWO TRANSFORMERS

If replacing a Honeywell thermostat with a clock wire "C", tape off wire "C".

TAPE OFF

GYWRCRHOB

FAN RELAY

COOLING COMPRESSOR

HEATING CONTROL

COOL TRANSFER

HEATING TRANSFER

DAMPER OR CHANGEOVER

VALVE (Powered in Cool)

DAMPER OR CHANGEOVER

VALVE (Powered in Heat)

F G

TAPE OFF

OPTIONAL

HEATING / COOLING SYSTEMS

GYWRCRHOB

FAN RELAY

COOLING COMPRESSOR

HEATING CONTROL

COOL TRANSFER

HEATING TRANSFER

DAMPER OR CHANGEOVER

VALVE (Powered in Cool)

DAMPER OR CHANGEOVER

VALVE (Powered in Heat)

V R

HEATING / COOLING SYSTEMS

Y C

F G

TAPE OFF

OPTIONAL

4 A

V R

C Y

TYPICAL HOOKUP FOR 2-WIRE

24V HEATING SYSTEM AND

MILLIVOLT SYSTEM

24 VAC

TRANSFORMER

THERMOPILE

GAS

VALVE

110

TYPICAL HOOKUP FOR 3-WIRE

HEAT SYSTEM IF THIRD

WIRE IS FAN WIRE

24 VAC

TRANSFORMER

GAS

VALVE

FAN

110

TYPICAL COOLING AND

HEATING SYSTEM

(4-WIRE)

24 VAC

HEAT

TRANSFORMER

GAS

VALVE

FAN

110

COOL COMP

TYPICAL COOLING AND

HEATING SYSTEM

(5-WIRE)

24 VAC

HEAT

TRANSFORMER

24 VAC

COOL

TRANSFORMER

REMOVE JUMPER BETWEEN "RC" AND "RH"

GAS

VALVE

FAN

110 110

COOL COMP

TYPICAL SINGLE-STAGE

HEAT PUMP WIRING

ADD JUMPER BETWEEN "Y" AND "W"

ALTERNATE

FAN

COMP

CHANGE

OVER

24 VAC

HEAT

TRANSFORMER

110

ALTERNATE

GYWRCRHOB

Terminals

NOTE

If you are mounting the base to a soft material like plasterboard or if you are using the old mounting holes, the screws may not hold. Drill a 3/16-in. (4.8mm) hole at each screw location, and insert the plastic anchors provided. Then mount the base as described below.

ATTACHING WIRES

Latch Button

4. Hold the base against the wall, with the wires coming through wherever it is convenient for wiring. Route the wires to the terminal block. Position the base for best appearance (to hide any marks from an old thermostat). Attach the base to the wall with the two screws provided.

CAUTION

Do not allow wires to touch each other or parts on thermostat. Wires must be trapped between

black spacer and brass terminal. Also, be sure to securely tighten all 7 electrical terminal screws.

WIRING DIAGRAMS

These diagrams below are provided for new installations or unreferenced wires.

If you have an electric system and the blower does not operate after installation, find the

electric/gas heat jumper on the back of the body. Move the jumper to the ELEC position.

INSTALLING BATTERIES/ MAINTENANCE

The TX250 requires batteries to operate your furnace and retain its programming in memory. Replace the batteries when the REPLACE indicator appears in the display or at least once a year.

LO BAT

REPLACE BATTERIES WHEN

INDICATOR APPEARS

OR AT LEAST

ONCE A YEAR.

1. Remove fresh batteries from their carton.

2. Cup and hold thermostat body and left tab

in place with left hand. Separarte tabs

with right hand.

3. Remove the used batteries.

Install two new Energizer®or DURACELL®"AA"

size alkaline batteries in the battery compartment.

Observe the polarity marking shown in the

compartment. Place body back on wall.

WARNING: Use Energizer®or DURACELL

Alkaline Batteries Only.

Installation is now complete. Be sure to turn the power back on to your heating and /or air conditioning system. If this is the first time you are installing batteries, the thermostat will display “SUN 12:00 AM”. Within 90 seconds the thermostat will begin to display the room temperature alternately with the time. To correct the display, see “Setting the TIME and DAY,” after you set the programs.

When replacing batteries, you

have approximately 1 minute

before programs are lost.

5. Align the top of the body onto the base and pr

GAS

ELEC

"AA"

Battery Compartment

NOTE

ess together.

"AA"

PROGRAMMING CHART

DAY PERIOD HEAT COOL

TIME TEMP. TIME TEMP.

MON. MORN

THRU DAY

NOTE

FRI. EVE

SAT. DAY

and EVE

SUN. NIGHT

NIGHT MORN

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