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© COPYRIGHT 20

1

6 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED

I M P O R TA N T !

Please read all instructions carefully before beginning 

installation and save for future reference.  Before 

removing any wiring from your existing thermostat, its 

wires must be labeled with their terminal designations.  

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 AND OPERATING 

INSTRUCTIONS

COMPATIBILITY

FEATURES

Vertical or Horizontal Orientation

Large easy to read backlit display

Mode and Fan control for ease of use

Simple Temperature UP and Down

Control.

Calibration control

Temperature Swing adjustability (9

levels)

2 or 5 minute compressor delay

Fahrenheit or Celsius selection

Temperature Limits for High and Low
selections

Test mode to temporarily disable the

compressor delay

TEMP UP

MODE

FAN

TEMP DOWN

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.

Patent # 6,951,306

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.

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 1.5 amps; higher

current may cause damage to the thermostat. If you are in doubt, call 

your HVAC contractor.

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

OFF

TOOLS REQUIRED

MODE

 

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.

Remember that your 

TP-LH121

 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.

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 wal

l.

Do not locate in unusual cooling conditions, such as: on a wall

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.

OPERATING INSTRUCTIONS

#1 Phillips screwdriver (small)

Wire Stripper

Drill

THERMOSTAT LOCATION

TP-LH121

 is 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.

TP-LH121

DIGITAL ELECTRONIC HEAT PUMP THERMOSTAT

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.

Press either 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.
Press the light bulb button to illuminate the display. Adjusting the

temperature will keep the display lit until no button has been pressed 

for over ten seconds

.

In spring and fall or when windows are open, you can set the system 

switch to 

OFF

.

Setting the 

FAN

 switch to 

AUTO

 automatically runs your system’s fan 

during heating and cooling.

Setting the 

FAN

switch to 

ON

 runs your system’s fan continuously even

without heating or cooling.
Setting the Mode switch to 

EMER

(emergency heat) runs your

Emergency heating system rather than the heat pump.

Summary of Contents for TradePro TP-LH121

Page 1: ...e thermostat If you are in doubt call your HVAC contractor Your thermostat is a precision instrument Please handle it with care OFF TOOLS REQUIRED MODE 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 Remember that your TP LH121 may be mounted vertically or hori...

Page 2: ... 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 TP LH121 ON THE WALL 1 Decide whether the thermostat will be mounted vertically or horizontally Y W 2 Strip insul...

Page 3: ... 3 seconds until the MENU screen is displayed MENU 1 Press and hold the Up and Down button simultaneously at the CAL selection 2 Press Up or Down to select the Calibration amount 5F to 5F increments 3 Once the desired calibration point is reached press and hold the Up and Down button simultaneously to select the value CALIBRATION 1 Press and hold the Up and Down button simultaneously at the SWNG s...

Page 4: ... 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 ...

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