Lux Products DMH100 Series Thermostat User Manual

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INSTALLATION AND OPERATING INSTRUCTIONS

INSTALLATION AND OPERATION

Please read all instructions carefully

DMH100 SERIES

before beginning installation.

TOOLS REQUIRED

#1 Phillips screwdriver (small)

C A U T I O N

To avoid electrical shock

and to prevent damage to

the furnace, air conditioner,

and thermostat, disconnect

DIGITAL MECHANICAL THERMOSTAT

Drill with 3/16-in. (4.8mm) bit

Easy as

1–2–3

PRO

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.

the power supply before beginning

work. This can be done at the fuse

box, at the circuit breaker, or at

the appliance.

Complete, Easy To Read Programming And Installation Instructions Inside

LUX PRODUCTS CORPORATION • Mt. Laurel, New Jersey 08054, USA

44308-04

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.

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.

I M P O R T A N T !

Thank you for your confidence in our product. To obtain the best

results from your investment, please read this manual 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.

7. This thermostat does not require leveling.

C A U T I O N

Read instructions carefully

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

Please save for future reference.

REMOVING THE OLD THERMOSTAT

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.

Switch electricity to the

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.

FEATURES

• The unit can be used with most

24 volt gas, oil or electric heating and

air conditioning systems, gas millivolt

furnace and air conditioner OFF; then

proceed with the following steps.

heating systems, and single stage heat pumps.

It cannot be used with 120 volt heating systems

or two stage heat pumps. Ask your dealer for

other LUX thermostats to control those systems.

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

wires do not fall back inside the wall.

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

• A large easy to read display shows you

the current room temperature at all times.

MOUNTING THE UNIT ON THE WALL

1. Press down on the button on top of thermostat and swing the body away

from the base and down to remove the body from the base.

• The unit has a built in digital control system

to accurately control the temperature in your home.

• The unit will learn the temperature characteristics of your home on a daily basis and

customize the control to give you the best comfort possible from a digital thermostat.

2. Strip insulation 3/8

in. (9.5mm) from wire

ends and clean off

any corrosion.

3. Fill wall opening with

non-combustible

insulation to prevent

drafts from affecting

the thermostat.

• You can also select a tighter temperature control if you have a forced hot water system or if

closer comfort is preferred over energy savings.

•

A press of either the Temperature Up or Down key will reveal the current Set Temperature.

•

A 4-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.

•

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

• 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.

N O T E

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

4. Hold the base against the wall, with the wires coming

through wherever it is convenient for wiring. Route the

wires to below 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.

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 tighten

securely all 7 electrical terminal screws.

WIRING DIAGRAMS

•

In the winter, set the system switch to HEAT to control your heating system.

In the summer, set the switch to COOL to control your air conditioner.

These diagrams are provided for new installations or unreferenced wires.

In spring and fall or when windows are open, you can set the system switch

OFF.

•

Setting the FAN switch to AUTO automatically runs your system’s fan during

heating and cooling.

Setting the FAN switch to

ON runs your system’s fan

continuously even without

heating or cooling.

The FAN switch works only if your system

provides a wire for the UNIT’S “G” terminal.

ADVANCED FEATURES

TEMPERATURE SWING

A thermostat works by turning your heating or cooling system on and off whenever the room

temperature varies a certain number of degrees from the set-point temperature. This variation is

the “swing.”

Your thermostat is carefully tuned to provide you with exceptional comfort as well as provide you

with energy savings. Should you desire to have the temperature controlled even more tightly in

your home at the expense of increased energy savings, you can change the swing value. Also

users of forced hot water systems may find this setting more comfortable.

Located on the back of the thermostat body are three jumpers.

To change from 0.5 degree F control to 0.25 degree F control, remove the jumper indicated by

0.5 F / 0.25 F.

INSTALLING BATTERIES/ MAINTENANCE

Press the small unmarked button on the front of the thermostat with a paper clip for the change

to take effect. The unit will now control your home to 0.5 degrees.

The unit requires batteries to operate your furnace and retain its memory.

Replace the batteries when the LO BATT indicator appears in the display or at

least once a year.

5 MIN/2 MIN MINIMUM RUN TIME

Your thermostat has an internal timer built in to protect your compressor. The timer forces a

minimum on-time of 5 minutes. You may change this minimum on-time to 2 minutes. To

accomplish this, place the jumper labeled W3 over both pins. You must press the small

unmarked button on the face of the thermostat for the changes to take effect.

N O T E

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

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

Elec/Gas

C/F Jumper

Selector

1. Remove fresh batteries from

their carton.

CHANGING FROM °F TO °C

• To change to Celsius - place the jumper

labeled W2 over both pins.

ELECT

2. Remove body of thermostat as

described during installation.

3. Remove the used batteries.

GAS

Battery

4. Install two new Energizer^®or

Compartment

• Press the small unmarked button on the

front of the thermostat for the changes

to take effect.

DURACELL^®"AA" size alkaline

batteries in the battery compartment.

Observe the polarity marking

shown in the compartment.

0.5F - SHORT

0.25F - OPEN

0.28C - SHORT

0.14C - OPEN

W1 (SWING)

W2 (C/F)

Swing Jumper

F - OPEN

C - SHORT

REPLACE BATTERIES WHEN INDICATOR APPEARS

WARNING: Use Energizer^®or

DURACELL^®

N O T E

Alkaline Batteries Only.

When replacing batteries, you

have approximately 1 minute

before programs are lost.

TECHNICAL SERVICE

If you have any problems installing or using this thermostat, please reread the instructions carefully.

Technical Service is available through our Technical Service Number. If you require assistance, please

call our offices between 8:00 a.m. and 4:30 p.m. Eastern Standard Time, Monday through Friday.

The number is (856) 234-8803 or visit our online technical support at www.luxproducts.com.

5. Place the body back on the wall. Hook the bottom

of the body onto the base, swing the body up

and snap the body onto the base.

Installation is now complete. Be sure to turn the power back on to your heating

and/or air conditioning system. Within 90 seconds the thermostat will begin to

display the room temperature.

WARRANTY

6. Press either the TEMPERATURE UP or DOWN key in order to show the current

SET TEMPERATURE.

Limited Warranty: If this unit fails because of defects in materials or workmanship within one year of

date of original purchase, LUX will, at its option, repair or replace it. This warranty does not cover

damage by accident, misuse, or failure to follow installation instructions. Implied warranties are limited in

duration to one year from date of original purchase. Some states do not allow limitations on how long an

implied warranty lasts, so the above limitation may not apply to you. Please return malfunctioning or

defective units to the participating retailer from which purchase was made, along with proof of purchase.

Please refer to Technical Service Section before returning thermostat.

Purchaser assumes all risks and liability for incidental and consequential damage resulting from

installation and use of this unit. Some states do not allow the exclusion of incidental or consequential

damages, so the above exclusion may not apply to you. This warranty gives you specific legal rights and

you may also have other rights which vary from state to state. Applicable in the U.S.A. only.

7. Press TEMPERATURE UP or DOWN keys again until your desired temperature is

displayed. The display will show the current room temperature again after two

seconds.

N O T E

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 as indicated on the diagram

below. Move the jumper from the pins on the far right to the pins on the far left.