Lux Products PSDH121 Thermostat User Manual

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OPERATING INSTRUCTIONS

Complete, Easy To Read

INSTALLATION AND OPERATING INSTRUCTIONS

In the winter, set the system switch to HEAT to control your system while

heating.

In the summer, set the switch to COOL to control your system while cooling.

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

DIGITAL ELECTRONIC HEAT PUMP THERMOSTAT

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.

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.

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.

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

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

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.

All wiring must conform to local codes and ordinances.

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

Your thermostat is a precision instrument. Please handle it with care.

BACKLIGHT

RESET

TEMP DOWN

TOOLS REQUIRED

#1 Phillips screwdriver (small)

FEATURES

Drill with 3/16-in. (4.8mm) bit

Slim design may be vertically or horizontally

mounted

Wire stripper/cutter

THERMOSTAT LOCATION

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.

Emergency Heat Switch

Simple temperature Up or Down keys will

display and adjust the Set Temperature.

Remember that your PSDH121 may be mounted vertically or horizontally

when determining the optimal location.

Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the floor,

and in a room that is used often.

Temperature displays in F° or C°

Temperature differential SWING settings of

0.25 and 0.5

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.

Selectable 2 or 5-Minute Minimum Run/Off time provides short cycle and

compressor protection

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.

Do not locate in a damp area. This can lead to corrosion that will shorten

thermostat life.

Do not locate where air circulation is poor, such as: in a corner or an alcove;

or behind an open door.

Do not install the unit until all construction work and painting has been

completed.

C A U T I O N

Do not allow wires to touch each other or parts on thermostat. Terminated wires must

be trapped between black spacer and brass terminal. Securely tighten all eight electrical

terminal screws.

C A U T I O N

Read instructions carefully 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 they may not comply with any standard.

REMOVING THE OLD THERMOSTAT

1. Switch electricity to the furnace and air conditioner OFF; then

proceed with the following steps.

2. Remove cover from old thermostat. Most are snap-on types and

simply pull off. Some have locking screws on the side. These must

J4 J3 J2 J1

JUMPER POSITIONS

(FOR REFERENCE ONLY

NOT SHOWN TO SCALE)

be loosened.

3. Note the letters printed near the terminals. Attach labels (enclosed) to each wire

for identification. Label and remove wires one at a time. Make sure the wires do

not fall back inside the wall.

4. Loosen all screws on the old thermostat and remove it from the wall.

MOUNTING THE PSDH121 ON THE WALL

1. Decide whether the thermostat will be mounted vertically or horizontally.

INSTALLATION OPTIONS

There are four options which are set by a group of numbered jumpers on the

rear of the units circuit board. They are:

J1: The minimum run time jumper J1 sets the minimum length of time that the

thermostat must remain with Heat or Cool either on or off before it will

automatically switch to the alternate On or Off state. This feature prevents short

cycling, and provides compressor protection for cooling units. Choices are 2 or 5

minutes.

C A U T I O N

Be careful not to drop the unit or disturb electronic parts.

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.

J2: The temperature format: jumper selects whether your thermostat displays

temperatures in Celsius or Fahrenheit.

4. Cup the thermostat with one hand behind the

thermostats display. Separate the unit from its base

plate using the tabs protruding from its body with

the other hand.

J3: This Jumper determines whether the display will be horizontally or vertically

oriented.

J4: This Jumper controls the “swing” or temperature variation in the home. Using

the smaller number results in more stable temperature, while the wider setting is

provided as a more energy efficient alternative. Users of force hot water systems

may find the 0.25 setting more comfortable.

TAB

N O T E

The table at left is printed on the

BASE

If you are mounting the base to a

5 min

Horizontal

Swing=0.5

OPEN

2 min

Vertical

Swing=0.25

circuit board. To change a jumper

position. The closed or shorted

position is that which covers both a

jumpers pins. To prevent its loss, a

jumper may be placed over one pin

only for the open positions. After

settings have been changed, press

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.

TERMINALS

the small-unmarked RESET button on the front of the thermostat for the changes

to take effect.

ATTACHING WIRES

5. Route the wires through the large hole in the base plate by the

terminal block. Hold the base against the wall, with the wires

coming through. Position the base for best appearance (to hide

any marks from an old thermostat). The terminal block should be

either to the right of or below the routing hole. Attach the base to

the wall with the two screws provided.

INSTALL BATTERIES

For detailed instruction, see BATTERIES/MAINTENANCE to install batteries at

this time.

Turn the power back on to your heating and/or air conditioning system.

Verify that the system and its fan are operating properly. When set to a high

temperature, the heating system should provide warm air after a short time.

Likewise, a cooling system should provide cool air after a short time. Usually sound

from the furnace and air conditioning units can be heard while they are running.

The rush of moving air should be heard within a short time after either has been

started.

PLEASE REVIEW THE WIRING DIAGRAMS IN THE NEXT COLUMN

FOR PROPER TERMINAL CONNECTION

The Installation is now complete.

CALIBRATION

Your thermostat is carefully calibrated at the factory, and will measure

temperature to within 1°. However, you can adjust the reading of your

thermostat:

Slide the MODE switch to OFF.

Press and hold the Up and Down buttons until the display shows a single digit

between +5F°(+3C°) and -5F°(-3C°).

Then the Up or Down buttons may be used to adjust the reading.

The display will return to normal operation after 4 seconds without an

adjustment.

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

is (856) 234-8803 or visit our online technical support at www.luxproducts.com.

HEAT PUMP

COMPRESSOR

CHANGEOVER

WARRANTY

VALVE

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

HEAT

24VAC

XFMR

LINE

FAN

OPTIONAL

COMMON

NOTE: ADD JUMPER SHOWN BETWEEN "W2" AND "E"

IF "E" IS NOT PRESENT

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