REMOVING THE OLD THERMOSTAT
Complete, Easy To Read
INSTALLATION AND
TYPICAL 4-WIRE SINGLE STAGE
OPERATING INSTRUCTIONS
SYSTEM MODE SWITCH:
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 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.
the following:
2. Remove cover from old
O
B
Y
W
RH RC
G
C
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
OR
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
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.
24 VOLT HEATING & COOLING SYSTEMS
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.
●
O
B
Y
W
RH RC
G
C
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
VALVE
OR
HEATER
HEAT
XFMR
COOL
XFMR
A/C
COMPRESSOR
Ground
FAN
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 ADJUSTMENT:
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.
O
B
Y
W
RH RC
G
C
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 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.
SAVE FEATURE:
To Enter Save Mode
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.
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.
●
While flashing, the “SAVE” temperature may be changed with the
UP/DOWN buttons.
Large Easy-to-Read,
EL (Electro
Luminscent)
●
After 5 seconds with no button presses, the displayed “SAVE”
CONNECTING THE WIRES
Back Light Display
Fan Slide
temperature will be used as the set temperature, and ambient temperature
Switch
5. Clean bare wire ends must be inserted between the
will be returned to the display.
●
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”
O
B
Y
W
RH RC
G
C
O
B
Y
W
RH RC
G
C
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
W
R
G
F
C
Y
RC
G
F
C
●
NOTE: Before use, remove the plastic film (if present) that is protecting
will be displayed flashing.
●
RH
V
5
R
V
5
the LCD display screen.
H
4
B*
TC
C*
6
B*
TC
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
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.
O
B
Y
W
RH RC
G
C
O
B
Y
W
RH RC
G
C
5/2 Minute Selectable Minimum Run/Off Time for Short Cycle /
Compressor Protection
Y
W
R
RH
RC
V
G
F
C
Y
W
RH RC
G
F
C
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.
R
V
5
C*
6
H
4
B*
TC
C*
6
H
4
B*
TC
5
R
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
O
B
Y
W
RH RC
G
C
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.
O
B*
Y
R
RC
RH
V
G
F
C
BATTERIES AND MAINTENANCE
INSTALLATION
C*
6
B*
TC
SETUP OPTIONS
INSTALLING NEW BATTERIES
PLEASE READ ALL INSTRUCTIONS CAREFULLY BEFORE BEGINNING
INSTALLATION.
5
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.
JUMPER SETTINGS
●
The diagrams below are provided for new installations
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
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.
O
B
Y
W
RH RC
G
C
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
F
C
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
+
-
GAS
VALVE
OR
SYSTEM
XFMR
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.
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
JP2 - 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.
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.
O
B
Y
W
RH RC
G
C
Optional
Common
Lead
C A U T I O
N
:
●
Read all instructions carefully before removing any wiring from existing
JP4 - 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
© COPYRIGHT 2006 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
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