Smart Temp 42 157 Owner's Manual

 Smart Temp

Thermostats

Model 42 157

Owners Manual

Congratulations on the purchase of your new Electronic Thermostat!

Your new Smart Temp thermostat has been built using the best components and 

design philosophy. As a result, if properly installed your new electronic programmable 

thermostat will provide you with years of trouble free and reliable service. 

The Smart Temp 42-157 has been designed to be attractive,  highly reliable and 

simple to use. Please take the time to read these simple instruction to familiarise 

yourself with the function and features offered in this product.

HEAT    OFF     COOL

Programming the Thermostat.

The 42-157 is a “5+2” day programmable thermostat; 1 program group is 

for the 5 weekdays, 1 program group is for the weekend, hence the 5+2. 

Further to this, the 42-157  has 4 programs per day. What this means is 

that up to 4 times each day the thermostat will change the temperature of 

the home. 

As an example, in heating mode - just before you get out of bed in the 

morning  you may want the home to heat to 20 Deg 

(

Program 1

)

.  While 

you are at work you may not want the house to get any colder than 15 

Deg

 (

Program 2

)

. Just before you arrive home at the end of the day you 

may wish the home to be at 21 deg 

(

Program 3

)

, and while you sleep at 

night you may want the home to be kept at a cosy 17 Deg 

(

Program 4

)

. 

Programming this thermostat is no more difficult than setting the clock. In 

programming mode however the thermostat will cycle between Hours, 

Minutes and Temperature for Program 1. By continuing to press the 

program button it will continue to cycle through Hours, Minutes and 

Temperature for Program 2. Then Hours Minutes and Temperature for 

Program 3 etc.

Again, after 20 to 30 seconds of NOT pressing a button the thermostat 

will return to normal mode.

Step 1

Use the               switch to select either heating mode or cooling mode. 

(Please note: This thermostat is capable of controlling both a Heating & Cooling system, The use of this 

thermostat does not indicate that your home or office has a Heating  AND Cooling system installed) 

PROGRAM

PROGRAM

PROGRAM

HEAT    OFF     COOL

or

or

or

Step 2

Press the            button. Program “1” indicator as well as the Weekdays 

will be displayed. The “HOURS” and AM or PM  on 

the LCD will flash. (See fig 5)  Press the            

button to adjust the hour to the time you wish the 

first program to start.

Step 3

Press the           button again. Now the minutes will flash for program “1”. 

Press the           button to adjust the minutes to the time you wish the first 

program to start.

Step 4

Press the           button again. Now the Temperature for program “1” will 

flash. Again, by pressing the           buttons you can adjust the desired 

temperature for program “1”

Pressing the program button again simply repeats the above procedure 

for Programs 2, 3 & 4 for the weekdays, then the 4 weekend programs 

(indicated by “SA SU” in the LCD).

Tip.

If you only require 2 or 3 programs per day, simply set the unrequired programs to 

the same value as a used program. For example, should you only require 2 

programs for the weekend (wake at 7:00am at 20 deg and Sleep at 11:00pm at 

17Deg. Simply set program 1, 2 & 3 for 7:00 am at 20Deg and program 4 for 

11:00pm at 17Deg. This way, at 7:00 the thermostat will move straight to program 3, 

and stay in program 3 until 11:00 pm (program 4 start time)

To adjust the Cooling program. Repeat the above procedure with the 

               switch in the “Cool” position.

M  T  W  TH  F

AM

1

HEAT

FIG 5

M

AM

4

TEMP

S a

  rt e

m

T mp

Operation

Great effort has gone into making the Smart Temp electronic 

thermostat an extremely simple thermostat to program and use. 

By reading and understanding these simple instruction, you will 

realise and use many of the features this thermostat has to offer.

Programming and set up of this product has been designed as a 

very methodical procedure. The same buttons (and sequence of 

buttons) are used to program and set up this product. 

As the 42-157 thermostat is a programable thermostat, when you first 

place the batteries into the thermostat, (or after you have pressed the 

reset button) you must set the real time clock. This is essential as the 42-

157 thermostat uses this clock to turn on the heating and cooling at the 

times that you request.

Setting the clock is a simple procedure that only requires a few key 

presses. When the batteries are first installed, the LCD will indicate the 

current room temperature and 12AM on the Clock as 

shown in Fig1. 

In this example, lets set the clock for 2:16PM on 

Saturday.

Step 1

Press the          button, the display will illuminate, the 

temperature indication will go blank and the hours digits 

will flash as in fig 2.

Step 2

By pressing the           buttons adjust the hours to read 

2PM. 

Step 3

Press the         button again. Now the minutes flash. 

Pressing the          will permit you to adjust the minutes 

to “16”.(Fig 3)

Step 4

Press the          button again. Now the day will flash as in fig 4. 

Press the           to adjust the day to read “SA”.

Step 5

Press the          button again to return to normal mode. Alternatively by 

NOT pressing a button for 20 to 30 seconds the thermostat will 

automatically go back into normal mode. The clock is now set. 

In this example, Pressing the          button cycles through Hours, Minutes 

and Day. (Indicated by the flashing digit). By pressing the           button 

permits you to make adjustments to the flashing digit. This same 

principal is used through out the programming of this thermostat.

Setting The Clock

DAY/TIME

DAY/TIME

DAY/TIME

DAY/TIME

DAY/TIME

or

or

or

or

M

AM

1

TEMP

Fig 1

Fig 3

AM

Fig 2

M

PM

Fig 4

M

PM