Lux Products DMH110 Thermostat User Manual

REMOVING THE OLD THERMOSTAT

Complete, Easy To Read

INSTALLATION AND

TYPICAL 4-WIRE SINGLE STAGE

OPERATING INSTRUCTIONS

SYSTEM MODE SWITCH:

The MODE switch has three positions: HEAT, OFF, and COOL. In the

winter, set the mode switch to HEAT to control your heating system; in the

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

spring and fall, or when the windows are open, you can set the switch OFF.

When the switch is in the HEAT position, the word "HEAT" will be displayed

next to the temperature. When the switch is in the COOL position, the word

"COOL" will be displayed next to the temperature. Either of these indicators

will be flashing if the system is currently running, or on steady if the system

is not currently running.

1. Switch OFF the electricity to

24 VOLT HEATING & COOLING SYSTEMS

both the furnace and air

conditioner; then proceed with

OPERATING INSTRUCTIONS

*Jumper

Provided

the following:

2. Remove cover from old

RH RC

thermostat. Most are snap-on

DMH110 SERIES

types and simply pull off. Some

Optional

Common

Lead

have screws on the sides, these

SMART TEMP DIGITAL THERMOSTAT

must be loosened first.

3. Take note the letters printed

near the wire terminals. Attach labels (enclosed) to each

wire for identification by terminal letter, not color.

4. Make sure the wires do not fall back inside the wall,

and remove and label one wire at a time.

5. Loosen all screws on the old thermostat and/or base,

and remove it from the wall.

System Common

Easy as

1–2–3

GAS

VALVE

SYSTEM

XFMR

A/C

COMPRESSOR

NOTE: When the system mode switch is in the OFF position, it is normal for

the system's blower fan ("G" terminal if used) to still become activated

depending upon the position of the FAN mode switch (see below).

FAN

HEATER

Installs Easily

Choose Heat or Cool

Set Temperature

52011

LUX PRODUCTS CORPORATION

Mt. Laurel, New Jersey 08054, USA

MOUNTING THE DMH110

TYPICAL 2-TRANSFORMER 5-WIRE SINGLE STAGE

24 VOLT HEATING & COOLING SYSTEMS

FAN MODE SWITCH:

The FAN switch has two positions: AUTO and ON. Whenever the fan is

commanded on by the thermostat, the word "FAN" will flash on the LCD

display.

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.

*Jumper REMOVED

●

In the AUTO position, the operation of the blower fan is determined only

by the on/off cycling of the heating and cooling systems.

●

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When the FAN switch is in the ON position, the system's blower fan will

be commanded ON, and remain ON while the FAN switch is in the ON

position (this also includes when the System Mode Switch is in the OFF

position).

I M P O R T A N T !

Optional

Common

Please read all instructions carefully before beginning installation

and save for future reference. Before removing any wiring from

your existing thermostat, the wires must be labeled with their

terminal designations. Ignore the color of the wires since they

may not comply with any standard.

Lead

System Common #1

System Common #2

1. Strip insulation leaving 3/8 in. (9.5mm) of bare wire on the

ends and clean off any corrosion present.

2. Fill the wall opening with non-combustible insulation to

prevent drafts from affecting the thermostat.

NOTE: The FAN switch only works if your system provides a wire for the

DMH110's "G" terminal.

GAS

Chassis

Ground

VALVE

HEAT

XFMR

COOL

XFMR

A/C

COMPRESSOR

FAN

HEATER

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

from your investment, please read these instructions carefully and

thoroughly. You should become fully acquainted with this thermostat before

installing it for usage. Follow the installation procedures carefully, and one

step at a time. This will save you time and minimize the chance of

damaging either the thermostat or the systems that it controls. These

instructions may contain information beyond that required for your particular

installation. Please save these instructions for future reference.

PUSH BUTTONS:

There are three push buttons below the unit's display screen. These are

used to: adjust the set point temperature, modify the values for user

changeable options, and to select the “SAVE” feature.

C A U T I O

Be careful not to drop the body or disturb any of the

N :

TYPICAL 24 VOLT

HEAT PUMP SYSTEMS

*Customer Supplied

*Jumper

Provided

electronic parts.

TEMPERATURE ADJ USTMENT:

Jumper

While in HEAT or COOL mode, a single press on either the UP or DOWN

button causes the word “SET” to appear on the screen. Once “SET” is

present, the set point can be altered by pressing either the UP or DOWN

button once per degree of change, or by holding either button down for at

least two seconds to automatically increment the set point quickly in the

associated direction.

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3. Pull your new thermostat apart by opposite pressure on the two

thumb tabs located on the bottom edge of the thermostat to separate

the unit

COMPATIBILITY

Optional

Common

Lead

The DMH110 can be used with most single-stage 24 volt gas, oil, or electric

heating and air conditioning systems, single stage heat pumps, or gas

Millivolt heating systems. It cannot be used with 3 wire zone valves, 120 volt

heating systems, or multi-stage heat pumps. Ask your dealer for other LUX

thermostats to control those systems.

NOTE: If you are mounting the bas e to

a s oft material like

SAVE FEATURE:

To Enter Save Mode

plas terboard, or if you are us ing the old mounting holes , the

s crews may not hold. Drill a 3/16-in (4.8mm) hole at each

s crew location, and ins ert the plas tic anchors provided. Then

mount the bas e as des cribed below.

System Common

●

Press the Save button.

“SAVE” will be visible in the display

The save temperature will be displayed flashing

In heat mode, the save temperature will be 5°F lower than the comfort

temperature.

In cool mode, the save temperature will be 5°F higher than the comfort

temperature.

While flashing, the “SAVE” temperature may be changed with the

UP/DOWN buttons.

After 5 seconds with no button presses, the displayed “SAVE”

temperature will be used as the set temperature, and ambient temperature

will be returned to the display.

REVERSING

VALVE

SYSTEM

XFMR

COMPRESSOR

(Heat Pump)

FAN

●

4. Hold the base against the wall. Route the wires through the

larger hole adjacent 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.

Connect to

Either “B” or “O”

but NOT both

●

FEATURES

●

WIRING DIAGRAM NOTES:

1. The BOLD lines are what you should be connecting to the terminals

on this new thermostat.

2. The DASHED lines are optional depending upon your system type.

3. In many cases, the thin lines shown as “SYSTEM COMMON” will not

be visible at the thermostat location, they are located with your heating

and cooling equipment.

4. For Heat Pumps, use the “B” or “O” wire, NOT BOTH. Typically

neither are used in a conventional system.

5. If “Y” and “C” wires are both present, then “C” is a common wire.

6. If you have a “B” wire in your system which is used as a common

wire, connecting it to the “B” terminal on this thermostat may damage

your system and/or the thermostat.

●

Large Easy-to-Read,

EL (Electro

Luminscent)

●

CONNECTING THE WIRES

Back Light Display

Fan Slide

Switch

5. Clean bare wire ends must be inserted between the

●

black clamp plate and the brass terminal.

6. Securely tighten all electrical terminal screws (even

unused ones).

“SAVE” will remain visible until the “SAVE” mode is cancelled.

Quick & Easy

Temperature

To Adjust SAVE Temperature

Change Buttons

Mode Slide

Switch

●

In “SAVE” mode “SAVE” will be visible in the display

Press UP or DOWN button

The save temperature will be displayed flashing.

The flashing the “SAVE” temperature may be changed with the

●

Save Button

●

HEATING ONLY SYSTEMS

COOLING ONLY SYSTEMS

UP/DOWN buttons.

●

JUMPER

PROVIDED

JUMPER

PROVIDED

After 5 seconds with no button presses, the displayed “SAVE”

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temperature will be used as the set temperature, and ambient temperature

will be returned to the display.

●

1 Stage Heat / 1 Stage Cool

Electronic Digital - Non Programmable

Innovative “SAVE” feature

Gas / Electric Blower Option

Battery Powered

Setting Temperature Range 45°F to 90°F

Clean, Attractive Design

Easy To Install

EL (Electro Luminescent) Backlight Display

Large, Easy To Read Display

F/C Selectable Temperature Display

Adjustable Temperature Differential / Cycle Rate

User Temperature Offset / Display Calibration

COMPLETING YOUR INSTALLATION

7. Please review the "SETUP OPTIONS" section to configure the

thermostat's options.

●

To Cancel SAVE Mode

●

In “SAVE” mode, Press the SAVE button.

The “SAVE” indicator will be extinguished and the comfort temperature

●

NOTE: Before use, remove the plastic film (if present) that is protecting

will be displayed flashing.

●

the LCD display screen.

The flashing comfort set temperature may be changed with the

UP/DOWN buttons.

After 5 seconds with no button presses, the comfort temperature will be

made the new set temperature, and ambient temperature will be returned to

the display.

8. Install two (2) Energizer^®or DURACELL^®"AA" size Alkaline Batteries

at this time. **For instructions on installing the batteries, see the

"BATTERIES AND MAINTENANCE" section.

9. Install your DMH110 thermostat onto its base. To do this, line up

the tabs on all four corners and gently push the unit straight onto the

base. Do not use unnecessary force if the body does not snap into

place easily. Remove the body, line it back up and try again.

10.Turn the electrical power back ON to both your heating and/or air

conditioning systems.

11.Verify that both systems (and the blower fan) are operating properly.

When set to a high temperature, the heating system should provide

warm air after a short time in Heat Mode. Likewise, a cooling system

should provide cool air after a short time when set to a low

temperature in Cool Mode. Usually, sound from the furnace and air

conditioning units can be heard while either of them is running. The

rush of moving air should be heard within a short time after either has

been started.

HEATING / COOLING SYSTEMS

4 & 5 WIRE WITH ONE TRANSFORMER

5 & 6 WIRE WITH TWO TRANSFORMERS

JUMPER

REMOVED

JUMPER

PROVIDED

DISPLAY ILLUMINATION:

Pressing any button will illuminate the display for easier viewing in dim

light conditions. The light will remain on for approximately 10 seconds.

While the light is illuminated, pressing any of the three push buttons will

continue the lighting and remain on for approximately 10 more seconds.

RH RC

5/2 Minute Selectable Minimum Run/Off Time for Short Cycle /

Compressor Protection

RH RC

USER TEMPERATURE CALIBRATION:

●

On-Screen Low Battery Indicator

1 Year Warranty

If the ambient temperature displayed on the LCD screen does not exactly

match a nearby thermometer, or perhaps another thermostat in the home,

the user has the ability to adjust or shift the displayed temperature. The

displayed temperature can be altered by up to 5°F (or 3°C) in either

direction. This adjustment is performed by first placing the System Mode

switch to the OFF position, then by pressing and holding both the UP and

DOWN buttons together for at least two (2) seconds, the screen will display

the word SET, and the default selection of zero (0). Press either the UP or

DOWN buttons for the associated direction of change. Note: If no buttons

are pressed within four (4) seconds, the thermostat will return back to normal

run mode.

C A U T I O

N :

TYPICAL SINGLE STAGE

HEAT PUMP WIRING

The DMH110 is protected against normal static electric discharges.

However, in extremely dry weather you should touch a grounded

metal object before touching the DMH110 to minimize the risk of

causing damage to the unit.

*CUSTOMER

SUPPLIED

JUMPER

12.Your installation is now complete.

RC-RH JUMPER

PROVIDED

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NOTE: If you have an Electric Heat system and the blower does not

operate after installation, locate the "Gas/Electric" option inside the back

of the thermostat. Move the jumper to the "Electric" position.

BATTERIES AND MAINTENANCE

INSTALLATION

SETUP OPTIONS

INSTALLING NEW BATTERIES

PLEASE READ ALL INSTRUCTIONS CAREFULLY BEFORE BEGINNING

INSTALLATION.

The DMH110 thermostat does not require batteries to operate your

heating and cooling systems, however if you are planning on using only

system power to run your thermostat, we do strongly recommend the use of

good quality alkaline batteries in addition to the system power source.

Replace the batteries when the “LO BAT” indicator appears in the display, or

USE "B" OR "O"

NOT BOTH

NOTE: This thermostat is able to be installed and used without changing

the items in this SETUP OPTIONS section. These are optional, and are

provided to meet your personal preferences.

C A U T I O

N :

Turn off electricity to the appliance before installing

or servicing the thermostat or any part of the

system. Do not turn the electricity back on until the

work is completed.

At Least Once A Year.

C A U T I O N :

1. To access your unit's battery location, remove the front half of the

thermostat from its base plate by applying opposite pressure on the two

thumb tabs located on the bottom edge of the thermostat and separate the

unit.

HARDWARE RESET

If a “B” wire in your system is a system common, connecting it to

the thermostat’s “B” terminal may damage your system or the

thermostat.

The Hardware RESET button restarts your thermostat's internal

programming and then returns the unit back to normal operation. A press

of this button is required to recognize any jumper setting changes

performed at the back of the thermostat on the circuit board. This reset is

a white button located inside on the back of the thermostat, on the circuit

board. It is labeled RESET.

●

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

Do not short (jumper) across the electric terminals on either the

2. The battery tray is located adjacent to the circuit board.

3. Remove the used batteries from the battery tray (if present) and install

two new Energizer^®or DURACELL^®"AA" size Alkaline Batteries into the

battery compartment. Observe the correct polarity markings shown in the

compartment.

4. Install your DMH110 thermostat back onto its base plate. To do this, line

up the tabs on all four corners and gently push the unit straight onto the

base. Do not use unnecessary force if the body does not snap into place

easily. Remove the body, line it back up and try again.

furnace or air conditioner to test the system. This may damage the

thermostat and void your warranty.

If “Y” and “C” are both present, “C” is a common wire.

●

All wiring must conform to all applicable local codes and ordinances.

J UMPER SETTINGS

●

The diagrams below are provided for new ins tallations

or for unreferenced wires .

This thermostat should be limited to a maximum of 1.5 amps; higher

There are four (4) headers (or jumpers) located inside the thermostat at

the rear of the circuit board. These settings can be changed from their

default values by removing its corresponding black jumper cap and

reinstalling the cap so that it is positioned on only one (1) of the metal

pins, and not both. A change to ANY of the jumper settings will not be

recognized by the thermostat until a HARDWARE RESET is performed.

An OPEN jumper means the cap is only on one (1) metal pin, and a

CLOSED jumper means the cap is on both of the metal pins. Each of

these jumpers changes a different option, the choices for these options

are listed in a table printed on the circuit board.

current may cause damage to the thermostat.

TYPICAL 2 OR 3-WIRE 24 VOLT

HEATING ONLY SYSTEMS

TOOLS REQUIRED

●

#1 Phillips screwdriver (medium)

TECHNICAL ASSISTANCE

*Jumper

Provided

●

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

●

Wire stripper/cutter

If you have any problems installing or using this thermostat, please

carefully and thoroughly review the instruction manual. If you require

assistance, please contact our Technical Assistance Department at 856-234-

8803 during regular business hours between 8:00AM and 4:30PM Eastern

Standard Time, Monday through Friday. You can also receive technical

assistance online anytime day or night at http://www.l u xproducts.com. Our

web site offers you answers to the most common technical questions, and

also permits you to email your questions to our technical support staff at

your convenience.

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THERMOSTAT LOCATION

A table similar to this one shown

CLOSE OPEN

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.

Optional

Common

Lead

here is printed on the thermostat's

JP1

JP2

5 MIN 2 MIN

circuit board. There may be minor

differences in some of the wording of

your specific model, but the function

of each option will be the same.

Optional

Fan

Lead

1. Locate the thermostat on an inside wall, at 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:

direct sunlight, near a lamp, television, radiator, register, fireplace, on a wall

opposite a stove, or that carries hot water pipes.

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 where air circulation is poor, such as: in a corner or alcove,

or behind an open door.

5. Do not locate in a damp area. This can lead to corrosion that may

shorten thermostat life.

JP3 NARROW WIDE

System Common

JP4

ELECT

GAS

VALVE

SYSTEM

XFMR

J P1 - 5 OR 2 MINUTE MINIMUM RUN/OFF TIMES

This setting changes the minimum length of time that the heating or

cooling system must remain either on or off before it will automatically

switch to the alternate on or off state. The purpose of this feature is to

provide air conditioning compressor protection by preventing brief or

undesirable on/off cycling.

FAN

HEATER

WARRANTY

Limited Warranty: If this unit fails because of defects in materials or

workmanship within three years of date of original purchase, LUX Products

Corporation 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 three years 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 ASSISTANCE" 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.

TYPICAL 3-WIRE 24 VOLT

COOLING ONLY SYSTEMS

J P2 - FAHRENHEIT OR CELSIUS DISPLAY FORMAT

This setting controls whether the temperature is displayed in

degrees °F or °C on the LCD screen.

*Jumper

Provided

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

completed.

J P3 - TEMPERATURE SWING SETTING

This setting changes the size of the temperature control band with

respect to the set point. The larger the swing setting, the larger the

temperature control range will be. Conversely, the smaller the swing

setting, the smaller (or tighter) the temperature control range will be.

This setting is called NARROW and WIDE.

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Optional

Common

Lead

C A U T I O

N :

●

Read all instructions carefully before removing any wiring from existing

J P4 - GAS / ELECTRIC FAN OPERATION

thermostat.

●

System Common

This setting changes whether the system's blower fan (if applicable)

is controlled by the thermostat in HEAT mode. Choose ELECTRIC if

you have electric heating, and require the thermostat to control the fan.

Choose GAS if you have a gas heating system, this will allow the

furnace itself to control the operation of the blower fan.

Wires must be labeled by their terminal letters before they are removed.

Do not allow wires to touch each other or parts on thermostat.

When removing wires from their terminals, ignore the color of the wires

since these may not comply with any standard.

●

SYSTEM

XFMR

A/C

COMPRESSOR

FAN