Smart temp 42 157 User 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
Sa
r
t
e
mTmp
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

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
with a button press.)
TM
Mode Selection Switch
(selects between Heat Off & Cool)
HEAT OFF COOL
DAY/TIME
HOLD / RET
PROGRAM
RESET
FAN ON AUTO
PM
TH
HEAT TEMP
3
Fan Switch
(Select Automatic or
continuous fan operation)
Battery Compartment
(Easy front Access for 2
Alkaline “AA” Batteries) Reset Switch
(Push with a paperclip to return
to factory default settings)
Front Door
(Hides batteries and buttons when
not in use for a neat appearance)
UP / Down Buttons
(Used to change the set temperature
and for programming adjustments)
Day / Time Button
(Used to enter the
Clock set mode)
Program Button
(Used to enter the
Program Mode)
Hold / Return Button
(Used to override the
program and maintain
a permanent set temperature)
Default Program
Note: All seven days have the same values
Temperature Deg C
Program Number
1
2
3
4
Time Cool
Heat
6:00 AM
8:00 AM
4:00PM
10:00 PM
20 C
16 C
20 C
16 C
26 C
29 C
26 C
28 C
Day
Program 1 Program 2 Program 3 Program 4
Monday
to
Friday
Saturday
&
Sunday
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Day
Program 1 Program 2 Program 3 Program 4
Monday
to
Friday
Saturday
&
Sunday
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Time
Temp
Fill out this table below with your settings
Heat mode
Cool mode
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
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.
PROGRAM
HOLD/RET
HOLD/RET
HOLD/RET
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
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
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.
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
the LCD indicating normal thermostat functions have been resumed.
To turn off a temporary override simply press the button twice.
or
or
or
HEAT OFF COOL
HEAT OFF COOL
HEAT OFF COOL
Making Life Comfortable
DAY/TIME
Fig 6

LCD Back light (INDIGLO )
This thermostat is fitted with a electroluminescent lamp which
activates for easy viewing in the dark. When any button or switch is
pressed the display is illuminated. This back light will remain on for
5 seconds after the last button is pressed.
Please note:
If the thermostat is in a low battery condition, the
back light will not operate. It is important to
replace the batteries with two new “AA” Alkaline
batteries when a low battery condition exists.
If the ambient noise level is very low, a quite high pitched sound
may be heard when the back light is on. This is a normal sound
made by the thermostat when the back light is on and is not a
malfunction.
Error Messages
If the thermostat is unable to control your system
due to an unexpected problem the 42-157
thermostat will enter “Error mode”. In this condition
the thermostat flashed “Err” on the LCD (fig7).
In the extremely unlikely event that your thermostat
enters this mode it is recommended that you immediately replace
the thermostat batteries with a new set of “AA” Alkaline batteries
(even if you have just replaced the batteries).
Next, using a paperclip press the reset button which can be found
directly under the button. You will now need to set the clock
and re program the thermostat to ensure correct thermostat
operation.
DAY/TIME
Fig 7
Troubleshooting
No Display.
1. Check batteries.
2. Press reset and reprogram.
Display Dims.
1. Replace Batteries.
No Back light
1. Replace Batteries.
Program does not change at your desired Setting.
1.Check the time is set properly, note the AM / PM indicator.
2.Check that the thermostat is NOT in Hold mode.
3.Check that the thermostat shows the correct day.
Heating or Cooling does not go On or OFF.
1.Check that the function switch is in the correct position.
2.Some systems require a delay between switching modes.
3.Check circuit breakers (fuses) to equipment.
4.Make sure pilot light (if applicable) on furnace is lit.
5.Replace Batteries in thermostat.
Erratic Display.
1.Replace batteries.
Thermostat permanently displays “HI”, “LO” or “Err”.
1. Replace Batteries and reset.
2. Replace thermostat.
ls A ai f om S ar
A o v lable r mt Temp
Smart Zone
Climate System Zoning Solution
Each zone controls the system independently.
The Smart Zone will call for heating or cooling, regardless of the
other zones requirements. This is almost like having two separate
systems. (Note, Both heating & cooling can’t run at the same time,)
Each Zone has its own timer, sensor and set temperature.
Because the Smart Zone is like two separate systems, the
temperature is measured in the zone being heated or cooled.
Further, each zone has its own time clock, therefore automatically
turning on the heating or cooling when you have programmed it!
Divide your home into Living and Sleeping Zones.
Using the Smart Zone you are able to heat or cool the living zones
during the day, and the sleeping zones during the night. Save
energy by only heating or cooling the zones your occupying.
Have two separate temperature Zones
As the Smart Zone is like having two completely independent
heating or cooling systems, each zone can set separate comfort
levels. Therefore eliminating the problem of the upstairs
overheating while maintaining a comfortable temperature
downstairs.
Ideal for Shared accommodation.
If you have a family member living with you, by zoning their area
of the home they have control over their comfort level while
leaving your settings unaffected. This also saves on energy costs as
you only heat or cool the occupied area of the home.
A home climate zoning system
can reduce energy costs by up to 50%
while improving home comfort.
Central
Heating
Unit
An example of what the system does
Central
Heating
Unit
Typical 2 story
Gas Centrally
Heated Home
Zoned Gas Centrally
Heated home.
Single Thermostat
Downstairs Thermostat
Upstairs Thermostat
Zone Flow
Controller
Zone Flow
Controller
Upstairs temp 27Deg C
Downstairs Temp 21 Deg C
Upstairs Temp 21 Deg CUpstairs Temp 21 Deg C
Downstairs Temp 21 Deg C
The Smart Zone control board maintains the correct temperature in
the zoned home by controlling the gas central heating unit and
opening or closing the appropriate flow control damper(s) to the
zone(s) that require heating.
This ensures the correct temperature is maintained throughout your
entire home.
The

Installation Instructions
These instructions assume the installer of this thermostat has
Knowledge of Heating & Air conditioning systems, the terminology
used in these systems and of the HVAC industry requirements.
It is an offence in Australia for unqualified persons to make any
changes to Airconditioning systems.
Failure to observe this may void equipment and thermostat
warranty, property insurance and cause irreparable damage to the
thermostat or equipment connected to it.
Remove the wall plate from the rear of the
thermostat by pressing the release tab
on the base of the thermostat. (Fig 8)
Position the wall plate on the wall and pull
the wires through the large opening.
Mount the wall plate with the supplied wall
anchors or other suitable means, ensure
the thermostat base is level to add to the
appearance of the installation.
Referring to the supplied wiring diagrams, connect the system
wires to the appropriate terminals on the thermostat base plate.
Ensure the screws are tightened securely to prevent potential
future problems caused by loose connections. Push excessive wire
length back into the wall cavity.
If the opening in the wall is large there may be a potential for a
draft to blow through the wall cavity and onto the temperature
sensor on the back of the thermostat. To ensure correct thermostat
operation it is important to block this hole. Failure to do so may
cause inaccurate or erratic system performance.
On the back of the 42-157 thermostat there are three clearly
marked selector switches. These switches are used to select the
temperature display format (deg C or deg F), the type of system
the thermostat is controlling (heat pump
or heat with add on cool) and whether the
fan is called by the thermostat (HE) or by
the system (HG)
These switch locations are shown in Fig
9. Adjust these switches to their correct
position.
Snap the two halves of the thermostat
back together taking particular care to
align the thermostat pins with the clips on
the base plate of the thermostat (Fig 10).
Set the thermostat to display the correct
time and day taking particular care with
the AM / PM and the day of the week.
Ascertain the customers requirement and
program the thermostat to the customers settings.
Test all thermostat modes by both raising the set temperature
above the ambient temperature in heat mode and verifying correct
heater operation. Next lower the set temperature to below the
ambient temperature with the thermostat in Cool mode verify the
correct operation of the equipment.
Leave a copy of these instructions for the future users of this thermostat
Should you have any questions or require any technical advice
please call Smart Temp Australia P/L on [phone] during
normal business hours.
Fig 8
Temperature
Display
(SW4)
Fan Option
(SW3)
System
Selector
(SW6)
C
F
HG - HE
NORM - HP
Fig 9
Fig 10
The Smart Temp 42-157 thermostat has been designed to switch 24volt
appliances only. Should you wish to control mains, 240VAC equipment
an optional Smart Pak (P/N SP - 03) interface will be required.
Please contact your place of purchase or Smart Temp Australia should
this interface be required.
The Smart Temp 42-157 is a battery powered thermostat and does NOT
require the use of a neutral. If this thermostat is replacing an existing
line powered thermostat, disregard the neutral wire.
Failure to heed this warning WILL result in thermostat damage.
X
Smart Temp
Thermostat
TM
Smart Temp Australia Pty Ltd
19 Indra Road Blackburn South 3130
Phone:[phone] Fax [phone]
www.smart-temp.com.au
Y1
Y/O
W/B Rc G
Rh
XX
Fan
Relay
Cool
Contactor
Heat relay
or Valve
Heat / Cool
24V Supply
4 Wire Heat/Cool System
STD HP
System
Selector
Factory Installed Link
Y1
Y/O
W/B Rc G
Rh
X
Fan
Relay
Compressor
Contactor
Reversing
Valve
Cool
Mode Or Heat
Mode
Heat Pump
24V Supply
Single Stage Heat Pump
STD HP
System
Selector
Factory Installed Link
Y1
Y/O
W/B Rc G
Rh
XX
X
Fan
Relay
Heat
24V Supply
Heat relay
or Valve
3 wire Heat only system
STD HP
System
Selector
Factory Installed Link
Y1
Y/O
W/B Rc G
Rh
XX
XX
Heat relay
or Valve
Heat 24V or
Mimilivolt Supply
2 wire Heat only system
STD HP
System
Selector
Factory Installed Link
XXX
Y1
Y/O
W/B Rc G
Rh
Fan
Relay
Cool
Contactor
Cool
24V Supply
3 wire Cool only system
STD HP
System
Selector
Factory Installed Link
Y1
Y/O
W/B Rc G
Rh
X
Fan
Relay
Cool
Contactor
Heat relay
or Valve
Heat
24V Supply
Cool
24V Supply
5 Wire Heat/Cool System
STD HP
System
Selector
Remove Factory Installed Link
Note:

Typical Programs(Monday - Friday
)
1 Heat Cool 2 Heat Cool 3 Heat Cool 4 Heat Cool
aDefault Program 6:00am 20 26 8:00am 16 29 4:00pm 20 26 10:00pm 16 28
bTypical worker (9:00am - 5:00pm) 6:30am 21 23 8:00am 7 26 5:00pm 21 23 10:30pm 7 35
cHome all day 7:00am 21 23 7:00am 21 23 7:00am 21 23 11:00pm 15 35
d
A
lways off(used in override function o 6:00am 7 35 8:00am 7 35 4:00pm 7 35 10:00pm 7 35
Typical Programs(Monday - Friday) 1 Heat Cool 2 Heat Cool 3 Heat Cool 4 Heat Cool
aDefault Program 6:00am 20 26 8:00am 16 29 4:00pm 20 26 10:00pm 16 28
bTypical worker 9:00am 21 23 11:30am 18 26 5:00pm 21 23 11:00pm 7 35
cHome All Day 8:00am 21 23 8:00am 21 23 8:00am 21 23 11:00pm 15 35
d
A
lways off(used in override function o 6:00am 7 35 8:00am 7 35 4:00pm 7 35 10:00pm 7 35
Manual Operation of the
Thermostat
Press and hold the up button
Set the desired temperature
There will be two temperatures
shown on the display - The top one is
the set temperature and the bottom is
the room temperature
Press and hold the down button
Set the desired temperature
There will be two temperatures shown
on the display- The top one is the set
temperature and the bottom is the
room temperature
Press the hold button twice.
"Hold" will be displayed on the
screen
This will hold the temperature
indefinately until the thermostat
reasches it's temperature, is
turned off or if the "hold/ret"
button is pressed (this will
resume to the programming)
Press the hold button twice.
"Hold" will be displayed on the
screen
HOLD/RET HOLD/RET
Do you want
to Heat or
Cool?
Move Slide switch to heat
position Move Slide switch to Cool
position
Heat Cool

Programming the
Thermostat
Do you want
to program
Heat or
Cool?
Move Slide switch to heat
position Heat Cool
Program 1 has now been
programmed. Repeat steps
for remainding programs
2,3 & 4 and for Saturday
and Sunday
Program 1 has now been
programmed. Repeat
steps for remainding
programs 2,3 & 4 and for
Saturday and Sunday
The number
should appear in the
bottom left hand corner
1
Adjust the hour by pressing
the up/down buttons
If no changes are required jump to
next step
Press the button labeled
The Hour should be flashing
PROGRAM
Press again
The Temperature should be
flashing
PROGRAM
Adjust the minutes by
pressing the up/down
buttons
Adjust the temperature by
pressing the up/down
buttons
Press again
The Minutes should be
flashing
PROGRAM
Move Slide switch to Cool
position
Press the button labeled
The Hour should be flashing
PROGRAM
Adjust the hour by pressing
the up/down buttons
If no changes are required jump to
next step
Press again
The Minutes should be
flashing
PROGRAM
Adjust the minutes by
pressing the up/down
buttons
Press again
The Temperature should be
flashing
Adjust the temperature by
pressing the up/down
buttons
PROGRAM