OPERATING INSTRUCTIONS
Complete, Easy To Read
INSTALLATION AND OPERATING INSTRUCTIONS
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In the winter, set the system switch to HEAT to control your system while
heating.
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In the summer, set the switch to COOL to control your system while cooling.
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Press the TEMPERATURE UP or DOWN key in order to show the
current SET TEMPERATURE.
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.
PSDH121 SERIES
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DIGITAL ELECTRONIC HEAT PUMP THERMOSTAT
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Press the light bulb button to illuminate the display. Adjusting the temperature
Easy as
HEAT
OFF
COOL
will keep the display lit until no button has been pressed for over ten seconds.
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1–2–3
In spring and fall or when windows are open, you can set the system switch
Installs Easily
Choose Heat or Cool
Set Temperature
to OFF.
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LUX PRODUCTS CORPORATION • Mt. Laurel, New Jersey 08054, USA
43368
Setting the FAN switch to AUTO automatically runs your system’s fan during
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.
heating and cooling.
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Setting the FAN switch to ON runs your system’s fan continuously even
without heating or cooling.
I M P O R T A N T !
Please read all instructions carefully before
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Setting the Mode switch to EMER (emergency heat) runs your Emergency
heating system rather than the heat pump.
beginning installation and save for future reference.
Before removing any wiring from your existing thermostat, its wires
must be labeled with their terminal designations.
N O T E
The FAN switch works only if your system provides a wire for a thermostat’s “G” terminal.
Ignore the color of the wires since they may not comply with any standard.
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. These instructions may
contain information beyond that required for your particular installation. Please
save for future reference.
INSTALLATION
Please read all instructions carefully before beginning installation.
C A U T I O N
*** 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. ***
OFF
COMPATIBILITY
TEMP UP
MODE
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Do not short (jumper) across electric terminals at control on furnace or air
LUX PSDH121 was designed
for use with single stage heat
pump systems with auxiliary
and/or emergency heat. These
systems are typical known as
2-stage heat one stage cool heat
pump systems.
conditioner to test the system. This will damage the thermostat and void
your warranty.
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All wiring must conform to local codes and ordinances.
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This thermostat is designed for use with 24 volt systems. The thermostat
should be limited to a maximum of 1.5 amps; higher current may cause
damage to the thermostat. If you are in doubt, call your HVAC contractor.
FAN
MODE
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Your thermostat is a precision instrument. Please handle it with care.
BACKLIGHT
RESET
TEMP DOWN
TOOLS REQUIRED
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#1 Phillips screwdriver (small)
FEATURES
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Drill with 3/16-in. (4.8mm) bit
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Slim design may be vertically or horizontally
mounted
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Wire stripper/cutter
THERMOSTAT LOCATION
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G
Large easy to read backlit display
Fan switch for system or continuous fan
operation
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.
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G
Emergency Heat Switch
Simple temperature Up or Down keys will
display and adjust the Set Temperature.
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Remember that your PSDH121 may be mounted vertically or horizontally
when determining the optimal location.
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Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the floor,
G
G
and in a room that is used often.
Temperature displays in F° or C°
Temperature differential SWING settings of
0.25 and 0.5
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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.
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Selectable 2 or 5-Minute Minimum Run/Off time provides short cycle and
compressor protection
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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.
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Do not locate in a damp area. This can lead to corrosion that will shorten
thermostat life.
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Do not locate where air circulation is poor, such as: in a corner or an alcove;
or behind an open door.
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Do not install the unit until all construction work and painting has been
completed.
© COPYRIGHT 2004 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
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NEW THERMOSTAT AND
CORRESPONDING TERMINALS
TAPE OFF
(NOT USED)
BATTERIES/MAINTENANCE
HEAT PUMP SYSTEM
WITH COMMON TERMINAL
1. Remove fresh batteries from their carton.
2. Remove body of thermostat as described during installation.
3. Remove the used batteries if present.
4. Install two new Energizer® or DURACELL® "AA" size alkaline batteries in the
battery compartment. Observe the polarity marking shown in the compartment.
WARNING: Use Energizer® or DURACELL® Alkaline Batteries Only.
5. Place the body back on the wall.
6. Using a small Phillips screwdriver press the RESET button which is between
the Up/Down arrow button. Within 90 seconds the thermostat will begin to
display the room temperature.
BATTERY COMPARTMENT
N O T E
REPLACE BATTERIES WHEN LOBAT APPEARS IN THE DISPLAY
OR AT LEAST ONCE A YEAR.
WIRING DIAGRAMS
These diagrams are provided for new installations or un-referenced wires.
TYPICAL HEAT PUMP WITH AUX HEAT
ALSO WIRED AS EMERGENCY HEAT
TECHNICAL SERVICE
USE "B" OR "O"
BUT NOT BOTH
If you have any problems installing or using this thermostat, please reread the
instructions carefully. Technical Service is available through our Technical
Assistance Dept. If you require assistance, please call our offices between 8:00
a.m. and 4:30 p.m. Eastern Standard Time, Monday through Friday. The number
E
Y
HEAT PUMP
COMPRESSOR
B
B
O
CHANGEOVER
OR
WARRANTY
VALVE
O
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.
AUX/EMER
W2
R
HEAT
24VAC
AC
XFMR
LINE
G
FAN
C
OPTIONAL
COMMON
NOTE: ADD JUMPER SHOWN BETWEEN "W2" AND "E"
IF "E" IS NOT PRESENT
© COPYRIGHT 2004 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
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