Smart Temp SMT-303 User Manual

TM

Smart Temp

SMT-303

Thermostats

Operating Instructions

24 Volt One Heat / One Cool thermostat

with 3 Speed Fan Control

Auto Changeover - Programmable

Congratulations on the purchase of your new

Electronic Thermostat!

Your new Smart Temp SMT thermostat has been built using the best

components and design philosophy. As a consequence of this, if properly

installed your new electronic programable thermostat will provide you with

many years of trouble free and reliable service.

The Smart Temp SMT has been designed to be attractive, highly reliably 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.

To turn the System On

With each press of the “On/Off” button, the SMT will toggle between “On” and
“Off” modes. The SMT will resume at the appropriate program for the current
time of day.

Programming your SMT

Your SMT thermostat will automatically adjust your homes temperature up to 4
times per day to suit your individual living requirements. For clarity, these times
(or programs) are identified as

Wake - the temperature you would like to wake to each morning.
Day - the temperature you would prefer you home to be during the day.
Return - the temperature you wish your home to be when you return at the

end of the days work.

Sleep - The temperature you wish your home to maintain while you sleep.

Programming the SMT is an extremely simple process and requires the use of
the “Prog” button (used to start the Programming process and advance
through the various steps) and the Temp “+” and “-” buttons to adjust the
necessary values (times and temperatures for example).

Setting the Clock

22

01:00

On/Off

We

Clock

Select

Diag 1

C

AM

Prog

that we are now setting the real time clock to the current time

and day). The hour will be flashing to indicate that this value can

be adjusted if necessary by using the

“+” & “-” buttons. Set the hours value to the correct time noting

the “AM” & “PM” indicators.

Note: Your SMT thermostat will automatically

resume normal function if there are no buttons

+

-

Step 1: Press the “Prog” button once and the display will

change as in Diag 1. The word “CLOCK” will show (to indicate

pressed for approximately 30 seconds. It is

recommended that once you start to programme

your SMT that you do not pause or you may have to

commence the programming procedure

Step 2: Press the “Prog” button again and now the minutes

display will flash indicating that if necessary the minutes

value can be adjusted by using the “+” & “-” buttons. Set

the minutes value to the correct time.

Step 3: Press the “Prog” button again and now the Day

display will flash indicating that if necessary the current

Day can be adjusted with the “+” & “-” buttons. Set the

Day value.

The Real time clock was just set using 3 basic button

presses. Programming the SMT to automatically

adjust the homes temperature is as equally a simple

process. Simply press the “Prog” button to select the

value that requires adjustment (if necessary) and

then the “+” & “-” buttons to adjust flashing digit to

the desired value.

from the beginning.

ol

tr

n

C

o

t

Remo e

n l

a

t o

i

Op

Operate your SMT from a remote location using
the optional Infra Red Remote control. Ideal for
the elderly, disabled or for those who require a
more convenient control method.

Setting the Program

Step 1: If you have not just set the clock or do not need to set the clock - press

the “Prog” button 3 times to move past the “Clock” set section of the
programming procedure (Being the Hours, minutes and day
adjustments).

Step 2: The SMT display will be as shown in Diag 2 indicating
that this “Wake” adjustment is for the 5 weekday Hours as
indicated by the Hour segments flashing as well as the Mo
(Monday) to Fr (Friday) display being shown. Also, the SMT
confirms that this is the Wake program by showing the word
“Wake” on the LCD. Pressing the “+” or “-” button adjust the hours
that you wish the wake time to commence.

Step 3: Press the “Prog” button again and now the Minutes segments will be
flashing, indicating this is the adjustment for minutes for the “Wake” program Mo
(Monday) to Fr (Friday). By pressing the “+” or “-” button adjust the minutes to the
value that you wish the wake time to commence.

C

Step 4: Again pressing the “Prog” button will advance you the

Set

next step in programming your SMT, setting the Heating and

24

Fan Lo A.Speed

Mo Tu We Th Fr

Cool

Program: Wake

Diag 3

Step 5: Pressing the “prog button again, the SMT will permit
adjustment for the heating temperature for the weekday “Wake”
program. Adjustment of this value is done with the “+” or “-”
buttons - Diag 4.

below the cooling set point. Moving the heating set point to high, will “push” the

The remainder of the programming process is completed by simply repeating this
procedure, pressing the “Prog” button to advances you through Hours, Minutes,
Heat Temp, Cool temp for the “Day” program, then Hours, Minutes, Heat Temp,
Cool temp for the “Return” program, then the Hours, Minutes, Heat Temp, Cool
temp for the Sleep program. Once the weekday program has been set, you can
continue the
programming for the
Saturday and Sunday
Wake, Day, Return &
Sleep Programs.

To review your
program, simply
press the “Prog”
button to advance
you through the
various settings

Tip If at any time you

wish to exit

programming mode

and return to normal

mode, press the

On/Off button twice.

Cooling temperatures for the weekday “Wake” program. That is,
the temperature you wish you home heated to (if it is cold out) or
cooled to (if it is warm out) at the Wake time you have just set.
Noting Diag 3 you will see that the SMT is
showing that the “Cool” temperature can be
adjusted. Again, by using the “+” & “-” buttons
this value can be set.

Note: The Heating set point must be at least one deg Celsius

cooling set point up ensuring the minimum temperature separation.

Fan Speed

indicator

Time

Display

Program
Indicator

Room & Set

Temperature

Display

Thermostat

ON / OFF

Button

Thermostat

Status

Indication

Set

ON

22

OFF

Fan Lo Fan Me Fan Hi A.Speed

Su Mo Tu We Th Fr Sa

Heat

AM

Cool

PM

Auto

10:22

Clock

Fan

Program: Wake
Day Return Sleep

Select

On/Off

Prog

Thermostat

Mode Select

Button

C

+

-

Program

Button

A.Speed

Mo Tu We Th Fr

AM

PM

10:22

Program: Wake

Diag 2

22

Fan Lo A.Speed

Mo Tu We Th Fr

Program: Wake

Diag 4

Mode

Indication

Temperature

Up Button

Temperature

Down Button

Auto or Cont

Fan Status

Display

IR Remote

Receiver

C

Set

Understanding the Mode and Fan speeds

Your SMT thermostat will automatically control your Heating system,

your cooling system and the fan speed for the heating and cooling

system.

Most users will prefer to let the SMT operate fully automatically, switching
between heating and cooling and regulating fan speeds to automatically
maintain the comfort levels you have previously set. Some uses however
may wish to manually switch between heating and cooling modes, or
manually control the fan speed.

By using the “Select”, the various operational modes such as heating or
cooling can be adjusted, as well as fan speeds.

The various modes are described below

To Adjust the Set (or desired) Room Temperature

When no buttons are pressed, the LCD indicates the current room
temperature. When the up (+) or down (-) buttons is first pressed the LCD
will flash rapidly and indicate the Set (or desired) room temperature. The
word “SET” will also be displayed in the LCD to confirm the set temperature
is being adjusted.

Heat Only Mode: In heat mode, the thermostat will only activate
the system heating when the room temperature falls below the
set (or desired) room temperature. Heat will be displayed in the
LCD to indicate this mode is set. When the SMT is calling for the
system to heat, the word “HEAT” will flash slowly in the LCD. In
this mode, the SMT will not turn on the cooling system regardless
of how warm the room becomes.

Cool Only Mode: In cool mode the thermostat will only activate
the system cooling when the room temperature raises above the
set (or desired) temperature. Cool will be displayed in the LCD.
When the SMT is calling for the system to cool, the word “COOL”
will flash slowly in the LCD. In this mode, the SMT will not turn on
the heating system regardless of how cool the room becomes.

Auto Season Change over Mode: In Auto mode the thermostat
will automatically activate the system heating or cooling to
maintain the set (or desired) heating and cooling temperatures.
The LCD will indicate Auto Season Mode by displaying both
“Heat & Cool” in the LCD. When the SMT is calling for the system
to heat or cool the appropriate word will flash slowly in the LCD.

Setting the Mode and Fan speeds

Like the programming steps previously explained, adjusting the
various operational modes are accomplished equally as simply and
with a minimum of button presses.

Step 1: Pressing the “Select Button” once will enter the mode selection
menu. The LCD will look similar that shown in Diag 5.
Pressing the “+” or “-” buttons will permit you to toggle
between heat only mode, cool only mode or fan only mode.

Step 2: Pressing the “Select Button” again will permit you
to select either Fan or Auto Fan modes with the “+” & “-”
buttons.

Step 3: Pressing the “Select Button” again will permit you to
select the fan speed or Auto fan speed. With the “+” or “-” buttons you can

23

Fan Me

Diag 6

22

Fan Lo A.Speed

Mo Tu We Th Fr

Program: Wake

Diag 7

toggel between Fan Lo (low speed fan) Fan Me (Medium

C

speed fan), Fan Hi (High Speed Fan) and A.Speed
(Automatic Fan Speed). Diag 6 shows a typical LCD.

Pressing the “select” button again returns the SMT to
normal mode. The new settings will now take effect.

Auto

Fan

Program Override Mode

Your SMT thermostat will permit you to temporarily
override your pre programmed temperatures to

C

accommodate a temporary change in circumstances, such

Set

as spending a day at home during the week due to illness
or work commitments.

In normal mode, press the “+” or “-” buttons will permit
you to temporarily adjust the current programs Cool and
Heat Temperature. These changes will take effect
immediately and last until the next program change when
they will be discarded. Diag 7

22

Diag 5

A.Speed

Heat
Cool

Internal Connections

24v Neutral

Lo Fan

Cool

R. Sens

Hi Fan

R. Sens

Me Fan

Heat

24V Supply

C

Fan only Mode: In fan only mode the SMT will only run the
system fan regardless of the set and room temperature. The SMT
will not attempt to control the Air Conditioning System heating or
cooling functions.
Fan only mode is typically used to improve building ventilation
and not to control room temperature.

Continuous Fan Mode

In Continuous Fan mode the system fan will run 24 hours per
day, but unlike the Fan Only mode described above the SMT will
also control the room temperature as dictated by the Heating,
Cooling or Auto modes set above. The SMT will indicate that this
mode is active by displaying the word “Fan” in the LCD.

Auto Fan Mode

In Auto Fan mode the SMT will only turn on the system fan on
when there is a call for system heating or cooling and off again
when the room is at the desired temperature. The LCD will
indicate that this mode is active by displaying the words “Auto
Fan” in the LCD.

Fan Speed

Your SMT thermostat has three fan speeds which can be
manually selected or left under automatic thermostat control.
When the Fan speed is set to automatic, your SMT thermostat
will increase the fan speed the further the room temperature is
away from the set temperature.

Y1

G1

Internal Temp Sensor

Sw 1 & 6 ON - Sw5 Off

On

1 2 3 4 5 6

Remote Temp Sensor

Sw 5 ON - Sw 1 & 6 Off

On

1 2 3 4 5 6

T

G3

T

Sw 1 Temp Sensor Select (see example)

Sw 2 Not Used

Sw 3 On - Fan Call by Plenum (Gas)

Off - Fan Call by thermostat (Electric)

Sw 4 On - NO 3 Min Compressor Protection
Off - 3 Min Compressor Protection enable

Sw 5 Temperature Sensor Select (see example)

Sw 6 Temperature Sensor Select (see example)

Black Denotes Switch Position

G2

W1

C

Rc

Rh

Specifications

Range: 5° to 30° c.
Resolution: 1.0°c
Accuracy: 0.3°c
Load rating: 2Amps.
Memory Backup: 14 hours
Voltage: 24VAC.
Connectors: Screw type.
Material: PC/ABS
Size: 80 x 90 x 22mm
Weight: 145g
Warranty: 1 year
I.R. Receiver: Installed

Smart Temp Australia Pty Ltd

19 Indra Road Blackburn South 3130
Phone:[phone] Fax [phone]

www.thermostat.com.au

Smart Temp

Australia

Making Life Comfortable

Revb March2004