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  
F
OF  
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.  
W
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.  
Y
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.  
R
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.  
C
A
U
T
I
O
N
Be careful not to drop the body or disturb electronic parts.  
C
A
U
T
I
O
N
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.  
© COPYRIGHT 2004 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED  
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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.  
C
A
U
T
I
O
N
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  
© COPYRIGHT 2004 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED  
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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  
N
O
T
E
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.  
W1  
W3  
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.  
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.  
© COPYRIGHT 2004 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED  
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