© 2006 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
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.
The DMH105 and 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.
PLEASE READ ALL INSTRUCTIONS CAREFULLY BEFORE BEGINNING
INSTALLATION.
TOOLS REQUIRED
• #1 Phillips screwdriver (medium)
• Drill with 3/16-in. (4.8mm) drill bit
• Wire stripper/cutter
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, 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.
6. Do not install the unit until all construction work and painting has been
completed.
REMOVING THE OLD THERMOSTAT
1. Switch OFF the electricity to both the furnace and air conditioner; then proceed
with the following:
2. Remove cover from old thermostat. Most are snap-on types and simply pull
off. Some have screws on the sides, these 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.
MOUNTING THE DMH105 and DMH110
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.
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.
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.
CONNECTING THE WIRES
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).
** Complete heating and/or cooling system wiring can be found in the WIRE
IDENTIFICATION AND WIRING SCHMATICS section of this instruction sheet.
The schmatics shown provide component information for brand new
installations or for unreferenced wires.
COMPLETING YOUR INSTALLATION
7. Please review the "SETUP OPTIONS" section to configure the thermostat's
options.
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 new thermostat onto its base. To do this, line up the tabs on all
four corners and gently push the unit straight onto the base, also providing
pressure in the center of the unit to ensure a proper union for all connection
points. 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.
12. Your installation is now complete.
HARDWARE RESET
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.
JUMPER SETTINGS
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.
A table similar to this one shown here is printed on the
thermostat's 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.
JP1 - 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.
JP2 - FAHRENHEIT OR CELSIUS DISPLAY FORMAT
This setting controls whether the temperature is displayed in degrees °F or °C on
the LCD screen.
JP3 - 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.
JP4 - GAS / ELECTRIC FAN OPERATION
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.
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.
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.
• In the AUTO position, the operation of the blower fan is determined only by the
on/off cycling of the heating and cooling systems.
• 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).
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.
TEMPERATURE ADJUSTMENT:
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 automat-
ically increment the set point quickly in the associated direction.
SAVE FEATURE:
To Enter Save Mode
• 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.
• “SAVE” will remain visible until the “SAVE” mode is cancelled.
To Adjust SAVE Temperature
• 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 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.
To Cancel SAVE Mode
• In “SAVE” mode, Press the SAVE button.
• The “SAVE” indicator will be extinguished and the comfort temperature will be
displayed flashing.
• 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.
DISPLAY ILLUMINATION (DMH110 ONLY):
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.
USER TEMPERATURE CALIBRATION:
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.
INSTALLING NEW BATTERIES
The DMH105 and DMH110 thermostats do 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 At Least Once A Year.
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.
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 new 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.
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.luxproducts.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.
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.
Complete, Easy To Read
INSTALLATION AND OPERATING INSTRUCTIONS
DMH105 (Non Lighted) and
DMH110 (Lighted)
IMPORTANT!
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.
LUX PRODUCTS CORPORATION
Mt. Laurel, New Jersey 08054, USA
Set TemperatureChoose Heat or Cool
Installs Easily
Easy as 1–2–3
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.
DIGITAL NON-PROGRAMMABLE THERMOSTATS
52034
COMPATIBILITY
WIRING INFORMATION
FEATURES
• 1 Stage Heat / 1 Stage Cool
• Electronic Digital
• Innovative “SAVE” feature
• Gas / Electric Blower Option
• System or Battery Powered
• Setting Temperature Range 45°F to
90°F
• Clean, Attractive Design
• Easy To Install
• EL (Electro Luminescent) Backlight
Display (DMH110 ONLY)
• Large, Easy To Read Display
• F/C Selectable Temperature Display
• Adjustable Temperature Differential /
Cycle Rate
• User Temperature Offset / Display
Calibration
• 5/2 Minute Selectable Minimum
Run/Off Time
• On-Screen Low Battery Indicator
INSTALLATION
SETUP OPTIONS
OPERATING INSTRUCTIONS
BATTERIES AND MAINTENANCE
TECHNICAL ASSISTANCE
WARRANTY
CAUTION:
The DMH105 and DMH110 are protected against normal static electric
discharges. However, in extremely dry weather you should touch a
grounded metal object before touching the thermostat to
minimize the risk of causing damage to the unit.
CAUTION:
Be careful not to drop the body or disturb any of the electronic parts.
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.
NOTE: The FAN switch only works if your system provides a wire for the
thermostat’s "G" terminal.
NOTE: Before use, remove the plastic film (if present) that is protecting the
LCD display screen.
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.
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.
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).
CAUTION:
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.
• Your thermostat is a precision instrument. Please handle it with care.
• Do not short (jumper) across the electric terminals on either the furnace
or air conditioner to test the system. This may damage the thermostat and
void your warranty.
• All wiring must conform to all applicable local codes and ordinances.
• This thermostat should be limited to a maximum of 1.5 amps; higher
current may cause damage to the thermostat.
CAUTION:
• Read all instructions carefully before removing any wiring from existing
thermostat.
• 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.
CLOSE
5 MIN
F
NARROW
ELECT
OPEN
2 MIN
C
WIDE
GAS
JP1
JP2
JP3
JP4
Fan Slide
Switch
Large Easy to
Read Display
(With Backlight
on DMH110)
Quick & Easy
Temperature
Change Buttons
Save Button
Mode Slide
Switch
