Lux Products DMH110 Thermostat User Manual

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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  
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  
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.  
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  
Ground  
VALVE  
OR  
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.  
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 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”  
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 thermostats 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.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.  
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  
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.  
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  
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  
© COPYRIGHT 2006 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED  

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