Salus S Series User manual

Instruction Manual
S-Series Digital Thermostat
Model No ST620/ST620PB
2

ST620 INSTRUCTION MANUAL2
PRODUCT COMPLIANCE
This product complies with the essential requirements of the following EC Directives:
•Electro-Magnetic Compatibility directive EMC2004/108/EC
•Low Voltage Directive 2006/95/EEC
•EC Marking directive 93/68/EEC
SAFETY INFORMATION
These instructions are applicable to the SALUS Controls model stated on the front cover of this
manual only, and must not be used with any other make or model.
These instructions are intended to apply in the United Kingdom only, and should be followed along
with any other statutory obligations - if you are in any doubt, please contact the SALUS Controls
technical helpline.
This accessory must be tted by a Competent person, and installation must comply with the
guidance provided in the current editions of BS7671 (IEE Wiring Regulations) and Part ‘P’ of the
Building Regulations. Failure to comply with the requirements of these publications could lead to
prosecution.
Always isolate the AC Mains supply before opening or removing the unit from the wall or wall box.
When tting batteries don’t mix new and old batteries together. Do not use rechargeable batteries.
Please leave these instructions with the end user where they should be kept in a safe place for future
reference.

What is a programmable room thermostat?
... an explanation for householders
A programmable room thermostat is both a programmer and a room thermostat.
A programmer allows you to set ‘On’ and ‘Off’ time periods to suit your own lifestyle. A room
thermostat works by sensing the air temperature, switching on the heating when the air temperature
falls below the thermostat setting, and switching it off once this set temperature has been reached.
So, a programmable room thermostat lets you choose what times you want the heating to be on,
and what temperature it should reach while it is on. It will allow you to select different temperatures
in your home at different times of the day (and days of the week) to meet your particular needs.
Turning a programmable room thermostat to a higher setting will not make the room heat up any
faster. How quickly the room heats up depends on the design of the heating system, for example,
the size of boiler and radiators.
Neither does the setting affect how quickly the room cools down. Turning a programmable room
thermostat to a lower setting will result in the room being controlled at a lower temperature, and
saves energy.
The way to set and use your programmable room thermostat is to nd the lowest temperature
settings that you are comfortable with at the different times you have chosen, and then leave it
alone to do its job. The best way to do this is to set low temperatures rst, say 18°C, and then turn
them up by one degree each day until you are comfortable with the temperatures. You won’t have
to adjust the thermostat further. Any adjustments above these settings will waste energy and cost
you more money.
If your heating system is a boiler with radiators, there will usually be only one programmable room
thermostat to control the whole house. But you can have different temperatures in individual rooms
by installing thermostatic radiator valves (TRVs) on individual radiators. If you don’t have TRVs, you
should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can
choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent
any overheating in other rooms by adjusting the TRVs.
The time on the programmer must be correct. Some types have to be adjusted in spring and autumn
at the changes between Greenwich Mean Time and British Summer Time.
You may be able to temporarily adjust the heating programme, for example, ‘Override’, ‘Advance’
or ‘Boost’. These are explained in the manufacturer’s instructions.
Programmable room thermostats need a free ow of air to sense the temperature, so they must not
be covered by curtains or blocked by furniture. Nearby electric res, televisions, wall or table lamps
may prevent the thermostat from working properly.
3ST620 INSTRUCTION MANUAL

INTRODUCTION
The ST620 from SALUS Controls is a stylish and accurate 5/2 or 7 day programmable electronic
thermostat with a large, easy to read Liquid Crystal Display (LCD). This programmable thermostat
has been specically designed to be used Volt Free.
The use of the revolutionary Touch Ring technology makes for simple usage, and is coupled with a
unique, smart design. The LCD display will show the current room temperature and the ‘one touch’
operation makes the ST620 easy to operate.
FEATURES
• Touch Ring Technology
• Large LCD with White Backlight
• Stylish Casing
• Volt Free Contacts
• Battery Powered with Replacement Indicator
• Frost Protection
• Burner on Symbol
• Radio Controlled Clock (RCC)
• Manual Time / Date Setting Option
• Holiday Function
• Service Function
• Six Time / Temperature Settings
ST620 INSTRUCTION MANUAL4

INSTALLATION
Please read the important safety information at the start of this manual before you start to install the device.
The ideal position to locate the ST620 thermostat is about 1.5m above oor level. It should be mounted in a
location where the thermostat is accessible, reasonably lit and free from extremes of temperature and draughts.
Do not mount the thermostat on an outside wall, above a radiator or in a location where it may be subjected
to direct sunlight.
To ensure trouble free reception for the Radio Controlled Clock (RCC),
always ensure that the programmable thermostat is mounted away
from any possible sources of interference (such as radios, TV sets,
computers, etc.), and is not mounted on or in close proximity to large
metal objects. Installing the ST620 in enclosed areas such as cellars
and basements is not recommended. There are only two electrical
connections required to the ST620, and these connections should be
made to the terminal block inside the programmable thermostat. No
Earth connection is required for the correct and safe operation of the
ST620, but a parking terminal is provided to connect an Earth wire if
one is present. These connections are shown in the drawing and table
below:
Terminal Function
L (COM) Live
SL (NO) Switched Live (output)
Earth Earth Parking (No electrical connection)
NOTE: All electrical installation work should be carried out by a suitably qualied Electrician or other
competent person.
If you are not sure how to install this programmable thermostat consult either with a qualied
electrician, heating engineer or your boiler / heating system supplier for advice on how to continue.
Wiring Diagram
H
T
SL
E
L
System= Heat Control Mode = On/Off
LN
5ST620 INSTRUCTION MANUAL

INSTALLING AND REPLACING BATTERIES
Installing or replacing the ST620 batteries is a straightforward operation, but does require you
to open the case of the programmable thermostat - always isolate the AC Mains supply before
opening the unit.
To open the ST620 case, undo the securing screw on
the bottom of the case (just to the right of the hole
for the Reset Button):
After undoing the screw pull it forward until the
screw stops moving, then carefully separate the
two halves of the case by gently pulling in an
upwards direction. Once the case has been
separated, the batteries should be visible:
Ensure that the batteries are inserted correctly, paying careful attention to the polarity markings on
the battery and next to the battery holders. After inserting the batteries, ret the ST620 case and
retighten the securing screw.
ST620 INSTRUCTION MANUAL6

AFTER INSTALLATION
After completing installation and powering up the ST620 for the rst time the programmable
thermostat will behave in the following way:
All the indicators on the display and the backlight will be turned on.
After 2 seconds the ST620 will then operate in NORMAL mode
and display the current room temperature, with the RCC
indicator ashing.
All programmable thermostat settings will be returned to default values.
If the Reset Button is pressed, the ST620 will behave in the same way as described above, except that
any previously saved user settings stored in the internal memory will be deleted and overwritten
with the default settings.
7ST620 INSTRUCTION MANUAL

ST620 INSTRUCTION MANUAL8
USER INTERFACE AND CONTROLS
The status and operation of the ST620 is clearly
shown on the large backlit Liquid Crystal Display (LCD).
This display allows the user to see at a glance the current
status of the heating system, as well as a clear indication
of the current room temperature.
The display consists of a combination of symbols and alphanumeric displays. The top row is a time and
day of the week indicator, the centre row is used to indicate temperature (in Celsius), and the bottom
row is an alphanumeric display for menu and status messages. The symbols around the outside of the
display are status indicators – an explanation of what these indicators mean is shown below.
Indicator Description Function
Clock Display Displays the day and time
Temperature indicator Displays set or measured temperature
Alphanumeric Display Displays menu and other status messages
Programme Number Displays the number of the
indicator active (selected) programme
Heat Mode indicator Indicates heating output is turned on.
Holiday indicator Indicates Holiday operation mode is selected
Battery Status Indicates battery is low
RF Signal indicator Indicates the unit is transmitting
(not used on ST620) a wireless signal
RCC indicator Indicates the status of the Radio Controlled Clock
Service indicator Indicates Service function is active
Frost Mode indicator Indicates frost setting is turned on
Touch Lock indicator Indicates touch lock is activated
There are few user controls for the ST620, making the programmable thermostat very easy to operate.
The controls are a Touch Ring (which surrounds the user display), two touch sensitive buttons, a reset
button and a slide operated switch mounted on the side of the thermostat.

USER CONTROL FUNCTION SUMMARY:
Key / Operation Functions
Touch Ring (move clockwise) Increases the set temperature and scrolls down the
menu selection
Touch Ring (move anti- clockwise) Decreases the set temperature and scrolls up
the menu selection
OK Key Enters Menu or conrms a menu selection
Arrow (Back) Key Single touch- sets the unit back 1 step.
Hold for 2 seconds sets unit back to normal mode
Reset Button Resets the thermostat to default (original factory) settings
Slide Switch Activates and deactivates the key lock function
(prevents accidental changes)
9ST620 INSTRUCTION MANUAL
These controls are shown below,
along with a description of each of
their functions.

OPERATION
The ST620 is congured and adjusted by the use of an
innovative and stylish Touch Ring, and two touch sensitive
buttons. The Touch Ring surrounds the programmable
thermostat display, and is operated very easily by moving
your nger around the ring.
The backlit Liquid Crystal Display (LCD) gives a highly visible,
easily readable indication of the thermostat status.
ACCESSING THE MENUS
The Arrow key is not active when the ST620 is in NORMAL mode. To access
the Menu screens, press the OK key twice. The rst menu displayed is the
PROGRAMME menu:
Use the Touch Ring to scroll through the
Menus, and press the OK key to select
the menu you want to use:
You can scroll through the menus in
either direction (forwards or backwards)
depending on the direction you move
your nger around the Touch Ring. The
menus are displayed in the order shown
in the picture above.
Pressing and holding the Arrow key for 2 seconds will return the ST620 to NORMAL mode.
The programmable thermostat will also return to NORMAL mode after 10 seconds if no Key is pressed
or if no movement is detected on the Touch Ring.
ST620 INSTRUCTION MANUAL10

PROGRAMMING THE ST620
The ST620 offers great versatility with its programming options, allowing the user to programme
the ST620 to operate on an individual, 5/2 or 7 day control cycle. The programmable thermostat
has a default set of Programmes that have been designed to meet the needs of most users. If these
default programmes are not suitable for your particular situation, reprogramming the ST620 with
your own settings is a very straightforward operation.
To start programming the ST620, press the OK key when in NORMAL mode. This will by default
select the PROGRAMME menu - press the OK key once more to start the programming process.
Initially, the Weekdays will be selected and ashing – you can scroll through all the various options
for day selection (Weekdays, Weekend, 7 days, or individual days) by using the Touch Ring. As usual,
pressing the OK key will select the desired option.
After correct selection of the day option, the ST620 display will change to the next programming
screen. These screens allow you to set the required time and temperature settings to provide
optimum control for your heating system.
The hour setting will be the rst setting that needs to be adjusted, and this will easily be seen
because the ‘hours’ section of the time will be ashing. Using the Touch Ring, scroll up or down to
adjust the hour to the required setting and then press the OK key to conrm.
11ST620 INSTRUCTION MANUAL

After conrming this setting the ‘minutes’ section of the time will then start to ash. Change this
setting using the Touch Ring in the same way that you changed the hour setting, conrming your
setting with the OK key. Finally, set the desired temperature setting by scrolling with the Touch Ring
and again conrm with the OK key.
Following this sequence will have set up Programme 1 – the ST620 display will then move on
to Programme 2. Continue to add your desired settings for each of the programmes through to
Programme 6 in the same way as Programme 1 (hour, minutes, and temperature).
If you decide to enter settings for individual days rather than Weekdays or Weekends, the ST620 also
offers a time saving COPY function that allows the user to copy settings from one day to another.
After entering the settings in Programmes 1 to 6 for Monday, the ST620 display will change to
display a COPY TO screen. On this screen, scroll to the day that you want to copy the settings to using
the Touch Ring, and then conrm this by pressing the OK key. The ST620 will then move to the next
day and ask if you would like to copy again.
In the example here, Monday has been programmed, and the next day that has not been programmed
is Tuesday. Once the settings for Tuesday have been programmed by copying, the settings can then
be copied to Wednesday, and so on.
Pressing the Arrow key at any time will return the ST620 to the previous screen. Once all the days
have been programmed, the ST620 will revert to NORMAL mode.
Please be aware that each of the programme time settings must be in sequence: for example,
Programme 3 cannot be set with a time earlier than Programme 2. If this situation occurs, then the
ST620 may operate in an unpredictable way. The programmable thermostat will return to NORMAL
mode after 10 seconds if no Key is pressed or if no movement is detected on the Touch Ring. In this
case, the Programmes will not be updated
ST620 INSTRUCTION MANUAL12

HOLIDAY OVERRIDE MODE
Entering the HOLIDAY menu allows you to turn the holiday override mode of the ST620 on. The
HOLIDAY mode allows the user to override all the current Programme settings with a specic
temperature setting that is active between two dates entered by the user.
When the holiday start date arrives, the HOLIDAY indicator turns on and the HOLIDAY mode is
switched on. As long as the ST620 is in HOLIDAY mode the FROST protection mode will be disabled.
When the holiday end date is reached, the HOLIDAY mode will be turned off automatically and the
ST620 will operate in AUTO mode. The HOLIDAY mode indicator will be displayed on all the
HOLIDAY menu screens.
To start entering the Holiday Override settings, press the OK key once. ‘SDAY’ will appear on the
display. Use the Touch Ring to scroll to set the date and conrm the choice using the OK button.
The month setting (‘S_MONTH’) will then be selected – change this setting in the same way using
the Touch Ring, and conrm the setting using the OK button. Finally, set the year (‘S_YEAR’) – this
is done in exactly the same way as previously described for the date and month.
After conrming the year setting by pressing the OK key, the display will then change to display the
rst screen for entering the holiday end date (‘E_DAY’, ‘E_MONTH’ and ‘E_YEAR’)
13ST620 INSTRUCTION MANUAL

Use the Touch Ring to enter the date in exactly the same way as for the holiday start date.
By default, the HOLIDAY mode start and end dates are set to the current date.
Make sure that the end date is after the start date – if not, the HOLIDAY mode will be disabled.
The nal setting to be entered is the protection temperature
you want set while HOLIDAY mode is active.
Use the Touch Ring to set the preferred temperature and conrm
the choice using the OK button. Once the temperature setting
is conrmed, the HOLIDAY mode will be activated. While in this
mode the HOLIDAY mode indicator will be shown on the
display, but there will not be any MANUAL or AUTO indication.
ST620 INSTRUCTION MANUAL14

Pressing the Touch Ring will change the display to show the current temperature setting, but this
setting cannot be adjusted while in this mode.
CANCELLING HOLIDAY OVERRIDE MODE
When in HOLIDAY mode, pressing the OK key will make the display change between CANCEL and
HOLIDAY every 0.5 seconds as shown below:
Pressing the OK key will cancel HOLIDAY mode and return the ST620 to AUTO mode. Pressing the
Arrow key leaves the programmable thermostat in HOLIDAY mode.
REVIEWING THE SET TEMPERATURE
NORMAL mode is when the thermostat is displaying the room temperature; if you press the Touch
Ring anywhere except the OK and Arrow keys when the ST620 is in NORMAL mode you can check
the set temperature setting.
This will display the current set temperature. The set temperature will be displayed for two seconds
before the LCD changes to display the room temperature again.
The ST620 will go back to NORMAL mode without changing the set temperature after 10 seconds of
inactivity, or after pressing the Arrow key.
15ST620 INSTRUCTION MANUAL

ST620 INSTRUCTION MANUAL16
FROST MENU
Entering the FROST menu allows you to turn the frost protection mode of the ST620 on or off. The
FROST mode temperature is preset at 5 ºC; this temperature is factory set and cannot be adjusted.
The FROST mode indicator will be displayed in all the FROST menu screens.
On entering the menu, use the Touch Ring to scroll to the preferred option (OFF or ON), and conrm
the choice using the OK button. Use the Arrow key to return to the Menu Option display.
If the ST620 is operating in FROST mode the LCD will not indicate MANUAL or AUTO, but will display
both the room temperature and also the FROST mode indicator.
To turn off FROST mode, select the FROST menu and then by using the Touch Ring scroll to the OFF
setting. Press the OK key to conrm the setting.

SLEEP MENU
The SLEEP mode allows the ST620 to conserve power by turning off the
LCD display. Entering the SLEEP menu allows you to activate this power
saving feature from a 5 second run down timer.
Pressing the OK Key at any time within the 5 seconds will cause the ST620
to immediately go into SLEEP mode, as will allowing the countdown to
complete. Pressing the Arrow key will return the ST620 to the Menu
display mode.
Pressing the Touch Ring for 1 second will turn on the LCD backlight, and pressing the Touch Ring
for 3 seconds will wake the ST620 from SLEEP mode and restore the programmable thermostat to
AUTO mode. N.B unit will not control the heating while in sleep mode.
17ST620 INSTRUCTION MANUAL
MANUAL OVERRIDE SETTING
When the ST620 is in NORMAL mode, press the Touch Ring anywhere
except the OK and Arrow keys to enter the Manual Override mode. The
currently set temperature will be displayed on the LCD and will ash.
When the set temperature is ashing, press the Touch Ring and move
your nger clockwise to increase the set temperature, or anti-clockwise
to decrease the set temperature. Press OK at any time to conrm the
selection. Note that the set temperature display will not ash while being
adjusted – this is normal and the display will start to ash again approximately 0.5 seconds after the
Touch Ring is released.
The ST620 will go back to NORMAL mode without changing the set temperature after 10 seconds of
inactivity, or after pressing the Arrow key.
When the ST620 is operating in Manual Override mode, the LCD will display
MANUAL instead of AUTO.The manual setting will remain in effect until the
next programme time is reached, programme or clock settings are changed, an
operating mode change is detected or the Manual Override mode is cancelled.
Manual Override mode can be cancelled at any time by pressing and
holding the Arrow key for 2 seconds – this will return the ST620 to AUTO
mode.

ST620 INSTRUCTION MANUAL18
MANUAL SETTING OF TIME AND DATE
If the time and date setting need to be set
manually, this can be done by accessing the
TIME menu. The rst option within the menu
is a choice of 12 or 24 hour clock setting.
On entering the menu, use the Touch Ring to scroll
to the preferred option (12 or 24 hour clock), and
conrm the choice using the OK button. Use the
Arrow key to return to the previous screen display.
After setting the time display format, the next screen
display allows you to set the time.
Use the Touch Ring to scroll to set the hour and conrm the choice using the OK button. The minute
setting will then be selected – change this setting in the same way using the Touch Ring, and
conrm the setting using the OK button. After setting the time, the next screen display allows you
to set the date – this is set in exactly the same way as previously described for the time.

19ST620 INSTRUCTION MANUAL
SETTING DST
Once you have set the date and time you will be asked to set the DST to ON/OFF, the screen will now
change to T_Zone. On this menu you can choose from -1,0,1,2 or 3hrs by using the Touch Ring to
scroll, and conrm the setting by using the OK button. Press the Arrow key to return to the previous
screen display, or do nothing for 10 seconds and the ST620 will return to NORMAL mode.
RADIO CONTROLLED CLOCK
The ST620 time and day of the week settings are updated automatically every day
(at 12:00 AM or 2:00 AM) by the use of a very accurate internal
Radio Controlled Clock.
The RCC status indicator will be displayed for 10 minutes during clock updates.
The indicator will ash during the time update process, after which the indicator
will be displayed for 5 minutes before turning off.
The time and date will also be automatically updated when the ST620 is
powered up, or after the Reset Button is pressed.
If for any reason the ST620 fails to automatically update the time setting, then the data stored in the
internal memory will be used. The clock settings can also be changed manually if required – manual
settings will be overwritten at the next successful automatic update.
CONTROL MENU
By selecting the Control menu, the user can change the
control method used by the thermostat - either ON/OFF
or Pulse Width Modulation(PWM). On entering the menu,
scroll to select the preferred option (ON/OFF or PWM
control), and conrm the choice using the OK button. Use
the Arrow key to return to the Menu Option display. PWM
mode should only be selected by the Engineer carrying
out the installation, or other qualied person.

ST620 INSTRUCTION MANUAL20
SERVICE MENU
The service menu should only be selected or changed by the engineer carrying
out the installation, or other qualied person. It is strongly recommended
that you familiarise yourself with the instructions contained in the operation
section of this manual before attempting to change any of the settings in the
service menu. During commissioning, the installation engineer has the option
to enter either his mobile or ofce telephone number as both a reminder when
the system is due to be serviced, and as a way for the home owner to make
contact when the service is due. The arrow key is not active when the ST620 is
in normal mode. To access the menu screen, press the OK key once. The rst
menu display is the PROGRAM menu.
BATTERY STATUS
The ST620 checks the battery voltage frequently during normal operation.
If the battery voltage is sensed as being low, the low battery indicator will be
displayed on the screen. Although the programmable thermostat will continue
to operate normally at this stage, you should replace the batteries as soon as
possible to prevent the ST620 entering OFF mode.
LANGUAGE FUNCTION
The language selection is usually selected on rst power up or when the unit
is reset. This is explained on page 7. However if you require to change the
language of the ST620 then you can do this by accessing the language menu.
Entering the language menu will allow you select your required language
Once your required language is displayed, press the OK button to select
and save.