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© COPYRIGHT 2006 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED

• In cool weather, when the system switch is set to HEAT, the TX500 will maintain cooler “set back”

room temperatures to save energy. It will then change to warmer “comfort” settings - all  automatically, at
specified times during the day.

• In warm weather, when the system switch is set to COOL, the TX500 will maintain warmer “set back” room

temperatures to save energy. It will then change to cooler “comfort” settings - all automatically, at specified
times during the day.

• A large liquid crystal display shows time, day of the week, and room and set temperatures.

5/2 Minute Selectable Minimum Run/Off Time for Short Cycle/Compressor Protection.

• Two Energizer

®

or DURACELL

® 

“AA” alkaline batteries (not included) are used to retain your time and

temperature programs.

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 instal-

lation. Please save for future reference.

I M P O R T A N T !

READ THE

INSTALLA

TION

INSTRUCTIONS

FIRST.

FEATURES

• The TX500 can be used with most 24 

volt gas, oil or electric heating and air 

conditioning systems or gas millivolt 

heating systems. It cannot be used 
with 120 volt heating systems or heat 
pumps. Ask your dealer for other LUX 
thermostats to control those systems.

• The TX500 is programmable. There 

are four programming periods per day. 
Each period can be programmed 
separately.

• You can use the built-in time/ 

temperature programs, or alter 

them to suit your schedule. The 
TX500 provides separate programming 
for weekdays and weekends — for both

heating and cooling. You can override the 

programmed temperatures for as little as one
programming period or for an entire vacation.

HEAT

OFF

COOL

AUTO

ON

FAN

RESET

HOLD

NEXT

RUN

SET

SUNDAY
PROGRAM

SET

WEEKDAY
PROGRAM

SET

DAY/TIME

500

P a t e n t s   P e n d i n g

SIMPLIFIED INSTRUCTIONS

TO SET PROGRAMS

• Rotate Dial to SET

WEEKDAY,
SATURDAY or
SUNDAY PROGRAM.

• Press UP/DOWN to

adjust start time.

• Press NEXT.
• Press UP/DOWN to

adjust temperature.

• Press NEXT.
• Repeat as needed or

rotate dial to RUN to
stop Programming.

TEMPORARY TEMPERATURE
OVERRIDE

•Press UP/DOWN to

adjust set temperature.

•To clear OVERRIDE press

UP/DOWN until original set
temperature appears or wait
for the start tf the next period.

TEMPERATURE HOLD

• Press HOLD. Adjust temperature

as desired with UP/DOWN.

•To clear, press HOLD again.

TO SET TIME & DAY

• Rotate Dial to set DAY/TIME.
• Press UP to change

current day.

• Press NEXT.
• Press UP/DOWN to set time.

Rotate the
dial to
the RUN
position
to close
the door.

DOWN

UP

MO

MORN

DAY

EVE

NIGHT

H
E
A
T

PM

The Active 
Program Period

Liquid

Crystal

Display

Fan Switch

System Switch

Thermostat Cover

LUX
Speed Dial

®

Thermostat
Body/Sub-base

The Set Temperature

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. 

TX500b SERIES

SMART TEMP

®

ELECTRONIC THERMOSTAT

Comple

t

e, Easy To Read Programming And Ins

t

alla

t

ion Ins

t

ruc

t

ions

HEAT

OFF

COOL

AUTO

ON

FAN

RESET

HOLD

NEXT

RUN

SET

SUNDAY
PROGRAM

SET

WEEKDAY
PROGRAM

SET

DAY/TIME

500

P a t e n t s   P e n d i n g

SIMPLIFIED INSTRUCTIONS

TO SET PROGRAMS

• Rotate Dial to SET

TEMPORARY TEMPERATURE
OVERRIDE

TO SET TIME & DAY

• Rotate Dial to set DAY/TIME.

DOWN

UP

MO

MORN

DAY

EVE

NIGHT

H
E
A
T

PM

HEAT

OFF

COOL

AUTO

ON

FAN

RESET

HOLD

NEXT

RUN

SET

SUNDAY
PROGRAM

SET

WEEKDAY
PROGRAM

SET

DAY/TIME

500

P a t e n t s   P e n d i n g

SIMPLIFIED INSTRUCTIONS

TO SET PROGRAMS

• Rotate Dial to SET

WEEKDAY

TEMPORARY TEMPERATURE
OVERRIDE

P

UP/DOWN t

TO SET TIME & DAY

• Rotate Dial to set DAY/TIME.

DOWN

UP

MO

MORN

DAY

EVE

NIGHT

H
E
A
T

PM

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