Smart Temp 43-157 User Manual
Smart Temp
Thermostats
Model 42 157
Owners Manual
Congratulations on the purchase of your new Electronic Thermostat!
M
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TEMP
Your new Smart Temp thermostat
design philosophy. As a result, if properly installed your new electronic
programmable thermostat will provide you with years of trouble free and reliable
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
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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.
Setting The Clock
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 42157 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
DAY/TIME
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
or
2PM.
Step 3
Press the button again. Now the minutes flash.
Pressing the will permit you to adjust the minutes
DAY/TIME
or
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
DAY/TIME
or
DAY/TIME
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
DAY/TIME
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.
M
AM
1
TEMP
Fig 1
AM
Fig 2
M
PM
Fig 3
M
PM
Fig 4
or
has been built using the best components and
service.
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)
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
HEAT OFF COOL
PROGRAM
or
PROGRAM
or
PROGRAM
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.
HEAT OFF COOL
or
M T W TH F
AM
1
HEAT
FIG 5
Liquid Crystal Display.
(Shows Day, Time, Temperature,
Program Number, Low Battery and mode).
Low Battery Indicator.
(Flashes when batteries
must be replaced)
INDIGLO night light.
(Operates automatically
Mode Selection Switch
(selects between Heat Off & Cool)
TM
with a button press.)
HEAT OFF COOL
FAN
Fan Switch
(Select Automatic or
continuous fan operation)
Battery Compartment
(Easy front Access for 2
Alkaline “AA” Batteries)
(Push with a paperclip to return
to factory default settings)
TH
PM
3
HEAT TEMP
AUTO
ON
Reset Switch
UP / Down Buttons
(Used to change the set temperature
and for programming adjustments)
Day / Time Button
(Used to enter the
Clock set mode)
DAY/TIME
RESET
PROGRAM
HOLD / RET
Program Button
(Used to enter the
Program Mode)
Hold / Return Button
(Used to override the
program and maintain
a permanent set temperature)
Front Door
(Hides batteries and buttons when
not in use for a neat appearance)
Note: All seven days have the same values
Default Program
Program Number
1
2
3
4
Fill out this table below with your settings
Time
6:00 AM
8:00 AM
4:00PM
10:00 PM
Heat mode
Day
Monday
Friday
Saturday
Sunday
Cool mode
Monday
Friday
Saturday
Sunday
Program 1 Program 2 Program 3
Time
to
Temp
Time
&
Temp
Day
Program 1 Program 2 Program 3
Time
to
Temp
Time
&
Temp
Temperature Deg C
Heat
20 C
16 C
20 C
16 C
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Cool
26 C
29 C
26 C
28 C
Program 4
Time
Temp
Time
Temp
Program 4
Time
Temp
Time
Temp
Override Functions
The Smart Temp 42-157 has two override modes. These are very useful
should you wish to make changes to the set temperature without
reprogramming the thermostat. The two override modes are described below.
Temporary Override
In this mode, the override temperature change will only last until the NEXT
program starts, hence it being called a “temporary override.” For example, you
might use this type of override when you want the home to be a little warmer
(or cooler) to accommodate a dinner guest. Adjusting the evening program
(program 3) will only last until the sleep program (program 4) begins later that
night, or until it is manually canceled as described below.
To make a Temporary Temperature Override.
Press and hold the button to change the LCD display to indicate the
“SET” or desired temperature. After approximately 1 second, the display will
blink once to indicate the temperature can be adjusted. Press and hold
or
or
to adjust the set temperature to your new desired temperature. You will note
that the Program indicator in the LCD will now flash to indicate that a
temperature override is now active.
Permanent Override.
The Smart Temp 42-157 permits the permanent override of all temperatures
and programs with a simple button press. This may be useful when you go on
holidays and not wish to let the home cool below at 12 deg C, 24 hours per
day, 7 days per week. Another common use of the permanent override is for
those that may not wish to use the Smart Temp 42-157 thermostat as a
programable thermostat, and use it in a “manual thermostat mode”, In this
way you can select a desired permanent temperature and by using the
switch turn the thermostat off or on manually as desired.
To make a permanent Temperature Override.
Should you wish to set a permanent temperature and override all program and
clock functions first select heating or cooling mode using the switch.
Next, using the buttons select the desired temperature. To lock this
temperature permanently simply press the button. The thermostat will
or
HOLD/RET
HEAT OFF COOL
indicate “HOLD” in the LCD confirming the permanently hold function is active.
It is then a simple matter to turn the thermostat off and on at the held
temperature using the switch.
HEAT OFF COOL
To turn OFF Temperature Overrides
When you no longer require a permanent temperature override and wish to
resume normal time clock functions, programs and temperature set points,
simply press the button. The “HOLD” symbol will no longer be shown in
HOLD/RET
the LCD indicating normal thermostat functions have been resumed.
To turn off a temporary override simply press the button twice.
HOLD/RET
HEAT OFF COOL
Making Life Comfortable
Additional Information
Low Battery Warning
The Smart Temp 42-157 is fitted with a two stage low
battery warning. When the batteries are first detected to
be weak the first stage Low battery warning will be
indicated by the low battery symbol in the LCD. It is
important to replace the batteries with Alkaline “AA”
batteries when this symbol is flashing.
When the batteries become too weak to maintain normal
thermostat operation the thermostat enters the second
stage low battery warning which shuts the thermostat
down and flashes the word “BATT” in the thermostat
display.
During a battery replacement You have approximately 1
to 2 minutes once the batteries are removed to place
fresh alkaline batteries in the thermostat before program
data is lost.
Please note: the back light function is suspended
when the low battery indicator is on.
12 or 24 Hour Clock
This thermostat is able to display the time in the
conventional 12 hour “AM / PM” or the 24 Hour time
format. To change the time format press the button
then the button to toggle between both time
PROGRAM
formats.
Span Mode
Your thermostat is set at the factory to maintain the room
temperature to within ½ deg C of the set
(or desired) temperature. For example, in heat mode if
the set temperature is 20 Deg C. The 42-157 will turn the
heating on at 19.5 deg C and off again at 20.5 deg.
This setting has been chosen as it provides the most
comfortable environment under most
conditions. However, if you find the
system cycling (turning off and on) to
quickly or slowly, the thermostats cycle
rate can be increased or decreased
with the “Span” setting.
To enter the “Span” adjustment mode press both the
buttons together for 5 seconds. The display will indicate
the factory default “Span 2”. (Fig 6)
By pressing the buttons will increase or decrease
the span setting.
Span 2 is the factory default setting. Span 1 decreases
the cycle rate, Span 3 increases the cycle rate.
The Span setting effects both the heat and cool mode
equally.
To exit the Span mode, simply press and hold both
The buttons for 5 seconds.
DAY/TIME
Fig 6
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