Seltron ST2 User manual

Room thermostat ST2
User manual
Setting manual
Installation manual

Table of contents
User manual
Appearance and description..............................................................5
Operating mode selection .................................................................7
Setting the day and night temperature...............................................8
Setting the comfort temperature........................................................9
PARTY and ECO mode.....................................................................9
HOLIDAY mode ..............................................................................10
Setting the accurate time.................................................................11
Program timer - programming .........................................................12
Pre-setted time programs................................................................14
Anti-legionaries disease program....................................................16
Manual domestic hot water warming activation...............................17
Room thermostat locking.................................................................17
Heating and cooling mode - selection..............................................18
Remote control with telephone........................................................18
Auxiliary temperature sensor - temperature overview......................18
Command to quick save and quit (Escape).....................................19
Battery replacement........................................................................19
Setting manual
Menu...............................................................................................20
Radio connection - test mode for ST2TX.........................................28
Factory settings - ST2 reset ............................................................29
Controlled system - selection ..........................................................30
Installation manual
Place of mount................................................................................31
Wall plate mount .............................................................................31
Wiring connections..........................................................................33
ST2R - ST2 with relay module R.....................................................34
ST2R - direct heating circuit pump ..................................................35
ST2R - boiler control .......................................................................36
ST2R - heating circuit with mixing valve (ON/OFF control)..............37
ST2R - gas boiler ............................................................................38
ST2R - electric floor heating............................................................39
ST2R - domestic hot water warming................................................40
ST2RDR - ST2 with double relay module RDR ..............................41

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ST2RDR - direct heating circuit ......................................................42
ST2RDR - direct heating circuit and domestic hot water .................43
ST2RDR - indirect heating circuit (3 point control) ..........................44
ST2RDR - direct heating circuit and boiler with
built in domestic hot water storage tank ..........................................45
ST2RDR - domestic hot water warming..........................................46
ST2RDR - direct heating circuit and cooling....................................47
ST2TX - ST2 with module for wireless control TX...........................48
ST2JV - ST2 with module for gas boilers JV...................................48
ST2JV - Junkers gas boilers ...........................................................49
ST2JV - Vaillant gas boilers............................................................50
ST2JVDR - ST2 with module for gas boilers JV and
auxiliary relay module DR ...............................................................51
ST2JVDR - gas boiler Junkers and d. h. w. circulation....................52
ST2JVDR - gas boiler Vaillant and d. h. w. circulation.....................53
Connecting the Telewarm ...............................................................54
Connecting the auxiliary temperature sensor..................................54
Error diagnostics.............................................................................55
Technical data.................................................................................56
Conformity with standards and directives........................................57
Guarantee............................................................................................58
Disposal of Old Electrical & Electronic Equipment .................................59

USER MANUAL 5
Appearance and description
ST2 is a powerful and efficient modular room thermostat with
exchangeable modules. It can be used in heating or (and) cooling
systems. It is suitable for radiator, convector and surface heating
systems. This manual applies for:
- ST2R - ST2 with relay module
- ST2RDR - ST2 with double relay module
- ST2JV - ST2 with module for Junkers and Vaillant gas boilers
- ST2JVDR - ST2 with module for Junkers and Vaillant gas boilers
and auxiliary relay module
- ST2TX - ST2 with module for wireless control
Room thermostat ST2 also enables connection of auxiliary tem-
perature sensor1and remote activation with the telephone1.
1this option is not available in all ST2 editions
LEGEND
Hold key while pressing other keys.
Hold key until you hear a beep sound.
Press and release key.
Press key to increase or decrease value.

USER MANUAL
6

Controlleddevices
- gas boiler
- liquid fuel boiler
Date and time
Knobforsetting
the daytemperature
Picture 1
Program timer CH1
-day.temperature
- night temperature
Operation mode
- off
- heating
- cooling
- d. h. w. warming
ECO
Remote activation
Program timer CH2
- d.h.w.warming
ON - active
OFF - inactive
Frost protection
Keyboard
locking
PARTY
- mixing valve
- pump
- d. h. w. storage tank
Empty batteries
Wireless mode
Measured
temperature
PARTY -day
temperaturemode Stand by
mode Night
temperature
setting
On mode -
Operation
according to the
program timer
ECO -saving
temperature
mode

7
USER MANUAL
Operating mode selection
Heating activation
Press key to select the requ-
ested operating mode (Picture 2).
Selected operation mode is indi-
cated on display.
- room heating
- room cooling
- domestic hot water warming
Picture 2
Picture 3
Room heating operates according to the program timer CH1, domestic hot water
warming operates according to the program timer CH2.
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changed in program group P1.3 (page 22).
Stand-by
Press key (Picture 3). On the
display appears symbol .
Frost protection remains active.

Night temperature
Hold key ( ) for approx. 5 seconds (Picture 5a). Release
key after you hear a beep. Now press key ( ) or ( ) to set
the requested night temperature (Picture 5b). To save and quit set
-up, press key ( ) once again.
Picture 5b
Picture 5a
Picture 4
Day temperature
Turn knob to set the requested
Setting the day and night temperature
USER MANUAL
8

Setting the comfort temperature
Room heating with the comfort temp. operates according to the program timer CH3
and has precedence over to room heating according to the program timer CH1.
If the comfort heating mode is inactive, the comfort tem-
perature setting is also inactive. The comfort temperature
mode is setted in program group P1.8 (page 22).
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Picture 6b
Picture 6a
Hold key for 5 second (Picture 6a). Use key ( ) or ( ) to
6b). To save and quit set-up, hold key for 5 seconds.
PARTY and ECO operating mode
PARTY - day temperature operation
Press key . Use key ( ) or ( ) to set duration of the
PARTY mode between 1 and 24 hours. For permanent PARTY
mode, select on.
To stop PARTY mode at anytime, press key .
9
USER MANUAL

ECO - night temperature operation
Press key . Use key ( ) or ( ) to set duration of the
ECO mode between 1 and 24 hours. For permanent ECO mode,
select on.
To stop ECO mode at anytime, press key .
Hold key for approximately 15 seconds. Release the key after
you hear a beep. Use key ( ) or ( ) to set duration of the
HOLIDAY mode between 1 and 99 days.
To stop HOLIDAY mode at anytime, again hold the key for 15
seconds.
Holiday mode
The HOLIDAY mode temperature is setted in program
group P1.4 (page 22). Factory pre-setted HOLIDAY
.
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The ECO temperature reductionis setted in
program group P1.2 (page 22).
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USER MANUAL
10

Setting the accurate time
Hours
Hold key and press key ( )
or ( ) to set the hours (Picture
7).
Picture 7
Picture 8
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Picture 9
Minutes
Hold key and press key
( ) or ( ) to set the
minutes (Picture 8).
Day
Hold both keys and , then
press key ( ) or ( ) to set
the day (Picture 9). The days are
marked from 1 to 7. Monday is
marked as 1and Sunday as 7.
while, the time is set to Monday, 20:00.
11
USER MANUAL

Press key ( ) or ( ) to select the program place that you
wish to modify. The display simultaneously writes out the time
command, the successive number of the program space (Picture
11) and switch-on/off command (picture 12, 13 and 14).
Picture 10
Picture 11
Modifying the time program
Program timer has three channels: CH1, CH2 and CH3.
CH1 is used for programming the room heating (day / night),
CH2 is used for programming the domestic hot water warming,
CH3 is used for programming the comfort room heating.
Time
command
Program timer
Selecting the program channel
Hold key and press key (Picture 10). Release both keys
after you hear a beep. Press key ( ) or key ( ) to select
the program channel you wish to modify.
Successive number
of the program space
USER MANUAL
12

Picture 12
- day temperature
- night temperature
Picture 13
Picture 14
- active domestic hot
water warming
- inactive domestic hot
water warming
- active comfort temperature
- inactive comfort temperature
CH1
CH2
CH3
Now press key ( ). On the display starts to flash day. Press
key ( ) or ( ) to set day, then press key ( ). On the
display starts to flash hours. Press key ( ) or ( ) to set
hours, then press key ( ). On the display starts to flash
minutes. Press key ( ) or ( ) to set minutes, then press key
( ). The display stops flashing. Now is possible to move to
the next program space. Press ( ) to move to the next program
space or press ( ) to move to the previous program space.
Every channel in program timer (CH1, CH2 and CH3) has 32 pro-
gram spaces. Time commands for day and night temperature
mode, time commands for active and inactive d. h. w. warming and
time commands for active and inactive comfort temp. mode are
13
USER MANUAL

Room thermostat ST2 has 6 pre-setted time programs for room
heating and 6 pre-setted time programs for domestic hot water
warming. For each channel CH1 and CH2 is possible to select
between 4 fixed (Pr1, Pr2, Pr3 and Pr4) and 2 users setted time
programs (Pr1 and Pr2 ).
Pre-setted time program selection
Hold key and by pressing key select the suitable time
program (Picture 16). Symbol indicates programs for room heat-
ing (CH1), symbol indicates programs for domestic hot water
warming. (CH2). Te view the time commands in program, press key
( ) or ( ).
The selected time program always overwrites the previous one. To
keep the current time program active, select - - -.
Picture 15
Unused time
command
Unused time commands are indicated as - -:- - (picture 15). Room
thermostat ST2 displays only used program spaces.
Picture 16
Pre-setted time programs
successively followed.
USER MANUAL
14

Table 1: Pre-setted time programs Pr1, Pr2, Pr3, Pr4
- time program for dom.
hot water warming
- time program for
room heating
Day Time Day Time
Day Time Day Time
Day Time Day Time
Day Time Day Time
15
USER MANUAL

If no d. h .w. temperature sensor is connected the room thermo-
state will warm the d. h. w. for 2 hours.
Pre-setted time programs with a symbol , can be user modified.
These programs can be changed or modified the same way as
programs in program timer (see chapter Modifying the time pro-
gram, on page 11).
User pre-setted programs Pr1 and Pr2
In program timer CH1 and CH2 are factory
pre-stored time programs Pr1.
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By default is in program Pr1 , stored program Pr1 and
for program Pr2 , program Pr3.
USER MANUAL
16
Anti-legionaries disease program
In order to protect against legionaries disease, this room unit has
The function is activated with a five minute ON interval in the pro-
gram timer (CH2).
Example : D. h.w. ON D. h.w. OFF
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Thermostat locking
Hold key for 15 seconds. Release the key after you hear a
beep. Symbol indicates locked room unit. To unlock the ST2,
again hold key for 15 seconds.
ST2 locking is setted in service group S1.9 (page 24).
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Manual d. h. w. warming activation
Hold key for 5 seconds. Release the key after you hear a beep.
Manual domestic hot warming is automatically deactivated,
when requested d. h. w. temperature is reached or at the
latest after 1 hour.
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We suggest you, to run the anti-legionaries program once in
a week during night time.
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USER MANUAL 17

With telephone is possible to remotely activate the day tempera-
ture mode. Remote activation is signalised with the sym-
bol .This function is setted in Program group P3 (page 23).
For analogue telephone line is available device G1-D. Device G44
is intended for remote control with GSM mobile telephone.
In normal display mode, hold key and press key (Escape).
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Remote control
Auxiliary temperature sensor - temperature
overview
Selection between heating or cooling
To switchover between heating and cooling and in reverse, hold
key for approximately 10 seconds (Picture 17). Release key
after you hear a beep. The display writes out active mode for a
few seconds, HEA - heating or COO - cooling (Picture 18).
Picture 17 Picture 18
18 USER MANUAL

USER MANUAL 19
Command to quick save and quit (Escape)
Every time you wish to quick store and quit set-up, hold key and
press key . Release both keys after you hear a beep.
i valid for program and service settings.
Empty batteries are indicated with the
symbol on display. We suggest the
battery replacement every 2 years. ST2
is supplied with two alkaline batteries 1.5
V type AAA. Battery socket is inside the
ST2. To remove thermostat from the wall
plate, do the following. Hold thermostat
in height of keys and pull it towards your-
self (Picture 19 - OPEN). After battery
exchange, put ST2 back on the wall
plate, by doing the following. Hook ST2
on top and push it with bottom towards
the wall plate (Picture 19 - CLOSE). Picture 19
Battery replacement
Battery exchange should be done within 20 seconds. In other case
you will have to set the accurate time again.
OPEN
CLOSE

Menu
All data and settings are joined into 16 groups:
CH1 program timer for room heating
CH2 program timer for d. h. w. warming
CH3 program timer for comfort room heating
d1 room thermostat data
P1 program group 1
P2 program group 2
P3 program group 3
S1 service group 1
S2 service group 2
S3 service group 3
Menu
To enter menu, hold key and press key (Picture 26).
Release keys after you hear a beep. The display writes out first
group CH1.
SETTING MANUAL
20
Picture 20