Seitron TDST24M User manual

1TDST24M000SE 032635 190619
DIGITAL CONTROL UNIT
FOR THERMAL SOLAR SYSTEMS
c
The installation technician shall operate in full compliance with all the applicable technical standards in order to
grant the unit safety.
WARNING
DESCRIPTION OF THE KEYS
RESET KEY
MENU KEY CANCEL KEY KEY ‘ABC FUNCTION’
CONFIRMATION KEY
SELECTION KEYS

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OVERVIEW
This device is a centralized control unit for thermal solar
panels. Equipped with 3 relay outputs (2 for loads + 1 for
alarm), PWM output, 0..10V output and 3 inputs (sensors),
can congure and manage up to 6 different types of solar
systems. When a specic installation is selected, the control
unit automatically manages the outputs and inputs used to
control the valves, the pumps, the integrative sources and
the probes used in the type of installation selected.
Moreover on the backlit LCD display it is possible to visualize
the hydraulic diagram of the installation set up, the state of
the outputs, the probes as well as several other data and
informations.
AVAILABLE ACCESSORIES AND SPARES
• Accessories for free contacts: 2 x 230V~ inputsand 2
free voltage outputs
• NTC probe 10K Ohm @25°C ±1%, -50°C .. +200°C
(blue cable)
• NTC probe 10K Ohm @25°C ±1%, -50°C .. +110°C
(yellow cable)
• Brass pocket 1/2” 7x38mm
TECHNICAL FEATURES
Power supply: 230V~ ±10% 50Hz
Power absorption: <2 VA
Sensors type: 3 x NTC 10K @ 25 °C ±1 %
Sensor operating range: -50 °C .. +200 °C (collector)
-50 °C .. +110 °C (boiler)
Temperature reading range: -20 °C .. 180 °C
Accuracy: ±2 °C
Resolution: 0,1°C (-20°C .. 144,9°C)
1°C (145°C .. 180°C)
Offset adjustment: on S1: ±5.0°C
on S2: ±5.0°C
on S3: ±5.0°C
Installer Password: 0000 .. 9999 (default 0000)
Acoustic Signal: On/Off (default On)
Backlight timing: 20 sec from last keypress
OUT2 Relay Logic: NOR=N.O. REV=N.C.
(default N.O.)
Contacts rating:
OUT 1 relay: 2(1)A max 250V~ (SPST)
Voltage free
OUT 2 relay: 8(1)A max 250V~(SPST)
Voltage free
Alarm relay contacts rating: 4(1)A max 250V~ (SPDT)
Voltage free
Output Signal:
PWM: Amplitude: 10V ±15%
Frequency: 1KHz
Current: 15mA max.
0..10V: Amplitude: 0V..10V ±10%@10V
Minimum load: 10KOhm.
Max allowed PWM / 0...10V
cable length: < 3m.
Protection grade: IP 40
Type of action: 1
Overvoltage category: II
Pollution degree: 2
Tracking Index (PTI): 175
Class of protection
against electric shock: II
Rated impulse voltage: 2500V
Number of manual cycles: 50000
Number of automatic cycles: 100000
Software class: A
EMC test voltage: 230V~ 50Hz
EMC test current: 34mA
Distances tolerances fault
mode ‘short’ exclusion: ±0,15mm
Ball pressure test temperature: 75°C
Operating temp. range: 0°C .. 40°C
Storage temp. range: -10°C .. +50°C
Humidity limits: 20% .. 80% RH non-condensing
Case: Material: ABS V0 self-extinguishing
Color: Signal White (RAL 9003)
Dimensions: 156 x 108 x 47 (W x H x D)
Weight: ~672 gr. (version with probe)
~553 gr. (version without probe)
Installation: Wall-mount
CLASSIFICATION UNDER REG. 2013.811.EC
Class: not applicable
Contribution to energy efciency: not applicable

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TO INSTALL THE DEVICE, PERFORM THE
FOLLOWING OPERATIONS:

1Remove the central screw and the plastic door.
4Fix the power unit base to the wall.

3ASSEMBLY WITH CABLE INPUT ON THE REAR PANEL:
if the cable fasteners (delivered with the unit) are not
required for installation, use a screwdriver to remove
the base blocks permitting the cables to pass through,
and t the blocks delivered (6).
INSTALLATION
2Remove the two screws shown in the drawing, then
remove the whole body from the base.


5Fit the cover again with the electronics at the base.
6ASSEMBLY WITH CABLE INPUT ON THE LOWER SIDE:
t the cable fasteners and/or the blocks delivered with
the unit.
7Make the electrical connections according to the
following layout and the examples on page 4 and 5.
WARNING!
The installation technician shall operate in full
compliance with all the applicable technical standards
in order to grant the unit safety

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WIRING EXAMPLE ONLY FOR SOLAR CIRCULATORS IN ACCORDANCE WITH DIRECTIVE ErP 2015 WITH
EXTERNAL PWM SIGNAL.
PWM signal
WARNING!
?
Before wiring the appliance be sure to turn the mains power off.
WARNING! S1, S2 and S3 are NTC temperature sensors. For S1 sensor the -50°C..+200°C range probe (blue cable) must be
used, while the probes with the range of -50°C..+110°C (yellow cable) can be used for the other probes.
The outputs OUT1, OUT2 and Alarm, are voltage free. It is advisable to t a 10A 250V~ fuse on the power unit mains capable
to intervene in case of short circuits on loads.
TERMINAL BOARD GROUNDING: On the base of the control unit case is located a brass terminal board for connecting the
ground protection conductors of the load devices connected to the control unit.
: reinforced insulation

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Fit the door again to close the power unit.
8
WARNING!
When closing the unit please ensure that the removable
wiring terminals have been inserted with the correct
orientation (the terminals screws must be facing
upward).
EXAMPLE OF CONNECTION FOR 3-SPEED SOLAR CIRCULATORS WITH WET or “HIGH EFFICIENCY”
ROTOR COMPLIANT WITH DIRECTIVE ErP 2015, WHICH DOES NOT REQUIRE AN EXTERNAL PWM
SIGNAL (WITHOUT A CONNECTOR FOR PWM).

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STARTING
TURNING ON AND OFF
To turn the control unit on and off, press the ‘ esc ’ key for
at least 3 seconds. When the control unit is turned on it will
carry out a diagnosis of the internal circuitry to verify its
correct operation and the red led will ash three times.
If the control unit reveals no anomalies the red led will
remain on, otherwise it will continue to ash quickly and the
display will show the type of error.
BACKLIGHT
By pressing any key the backlight of the display is activated.
The backlight automatically shuts off after about 20 seconds
from the last key depressure.
ACOUSTIC SIGNALS
The control unit is supplied with an internal buzzer that gives
the user an acoustic feedback in case of pressure on the
keys, alarms and failure. The acoustic signal can be disabled
by properly setting the relevant ‘ Installer Parameter ’.
TEST FUNCTION FOR LOAD WIRINGS CHECK
By keeping pressed for 10 seconds the ‘ ‘ button, the
control unit performs the functionality test of the loads
connected to it, in order to allow the installer to check
the wirings. The control unit checks the connected loads,
depending on the congured layout, by simultaneously
activating the relays outputs for about 30 seconds, while the
PWM outputs will be raised at the maximum speed.
The test activation is showed on the control unit by
activating the ‘ TEST ’ icon on the display.
To exit the Test mode, push the ‘ esc ‘ button at any time.
TEMPERATURE AND SPEED DISPLAY
The unit will normally show on the alphanumeric display the
temperature (in °C) measured by the sensors connected and
the speed (in %) of the collector pump controlled with the
PWM or 0..10V output.
The power on of the collector pump (Erp and/or Traditional) is
shown on the display with the icon ‘ ‘ as follows:
Icon ‘ ‘ still lit: Erp and/or Traditional
pumps OFF
Icon ‘ ‘ ashing slow: Erp Pumps ON and
Traditional OFF
Icon ‘ ‘ ashing fast: Erp Pumps and/or
Traditional ON
By pressing the keys ‘ ‘ or ‘  ‘ you can cycle through
the display of the value of the sensor or pump speed:
S_1 S_2 S_3 %PWM %010 
AUTOMATIC / ABC (Automatic Boiler Control)
OPERATION
The control unit can manage the installation selected in 2
different modes:
- AUTOMATIC (Normal controller operation)
In this mode the control unit automatically manages and
controls the operation of the installation according to the
programmed data (normal controller operation).
- ABC (Automatic Boiler Control)
By pressing the ‘ ‘ key you can enable or disable the ABC
function on the unit.
When the ‘ ABC ‘ function is active, the display will turn on
the ‘ ‘ icon.
Following are the conditions which result in activating the
collector pump:
S_1≥TABC+Hysteresis value
and
S_1≥S_2+ Hysteresis value
Following are the conditions which result in turning off the
collector pump:
S_1<TABC
or
S_1<S_2
Where:
S_1: Temperature measured by the collector sensor.
S_2: Temperatura measured by the boiler sensor.er.
TABC: Temperature set with installer parameter P2.
Hysteresis value for ABC function: 3.0°C (xed -
unchangeable)
The only active controls will be those relative to the
maximum and safety temperatures.
RESET
In order to reset the device, press the key labelled as
‘ RESET ’ located behind the removable door; DO NOT USE
PINS OR NEEDLES.

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Using installer parameters
Inserting the correct Password gives access to the installer
parameters change mode (‘ SET ’ icon lights). The rst
information displayed is the model of the control unit in use
and the parameter ‘ P1 ’ value.
By pressing the ‘ ‘ or ‘ ‘ keys it is possible to scroll
through the various parameters.
Pressing the ‘ ‘ key takes the user to the parameter
modifying mode selected.
To exit the installer mode press the ‘ esc ’ key or wait
20 seconds.
INSTALLER PARAMETERS
To access the installer parameters press the ‘ ‘ key.
Entering the Password
The display will show ‘PWD 0000’ with the leftmost digit
ashing thus requesting for the correct password.
In order to set the 4 password digits use the ‘ ‘ or ‘ ‘
key; by pressing the ‘  ‘ key, the current digit is conrmed
and the ashing is transferred to the following digit.
After conrming the last digit, the ‘  ‘ key will give access
to the installer parameters.
The initial password is factory set as ‘0000’.
Modifying the Password
In order to modify the stored password, rst press the ‘ ‘
key, then proceed as follows:
PRESS THE ‘ MENU ’ KEY.

THE DISPLAY SHOWS
‘ PWDH0000 ’.

Pressing the ‘ esc ’ key at any time will exit the password
management mode.
INSERT NEW PASSWORD.
THE CONTROL UNIT WILL MEMORIZE THE NEW
PASSWORD AND GIVE ACCESS TO THE INSTALLER
PARAMETERS.

ENTER THE CURRENT PASSWORD.
(same procedure described above)
THE DISPLAY SHOWS
‘ PWDN0000 ’.


THE DISPLAY SHOWS
‘ PWDC0000 ‘.

INSERT THE NEW PASSWORD.

PRESS THE ‘ ‘ KEY ON THE START PAGE.

THE DISPLAY SHOWS ‘ PWD 0000 ‘.


INSERT THE CURRENT PASSWORD.
THE DISPLAY SHOWS THE FIRST
‘ INSTALLER PARAMETER ’.

USING THE ARROWS ‘ ‘ OR ‘ ‘ IT IS POSSIBLE
TO CYCLICALLY SCROLL THROUGH THE INSTALLATION
PARAMETERS:
P1: SELECTION INSTALLATION TYPE ‘ SCH ’
P2: SETTING THERMAL DATA ‘ DATA ’
P3: ANTIFROST PARAMETERS MANAGEMENT ‘ O AF ’
P4: ACOUSTIC SIGNAL MANAGEMENT ‘ BEEP ’
P5: LOGIC RELAY SELECTION ‘ ACT ’
P6: INTEGRATION HOURS COUNTER ‘ C AH ’
P7: LIMITATION OF COLLECTOR MINIMUM TEMP. ‘ MTL ‘
P8: PWM and 0..10V OUTPUTS SETTINGS ‘ ERP ‘
P9: COLLECTOR RESET TEMPERATURE ‘ SAFE ‘
P10: VACUUM TUBES ‘ VTC ‘
P11: ANTI-LEGIONELLA ‘ LEG ‘

CONFIGURE DATA FOR EVERY SINGLE PARAMETER AS
EXPLAINED BELOW.

PRESS THE ‘ ‘ KEY TO MODIFY THE
SELECTED PARAMETER.


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Note: in the ‘ installer parameters ‘ mode all the outputs
are disabled. All default values are to be considered
as indicative, being they subject to changes due to
the version and without prior notice.
P1: SELECTION INSTALLATION TYPE
Pressing the ‘ ‘ or ‘ ‘ keys will show all the installations
that can be set up (if the probe for the selected installation
has a problem or is left unconnected, that probe will ash
on the display).
To conrm the selected installation press the ‘ ‘ key; the
control unit will memorize the choice and the display will
again show the parameter list.
To cancel the selection, press the ‘ esc ’ key. In this case the
control unit will abandon the changes made and will show
again the parameter list.
The parameters inuencing the regulation of the selected
setup are listed in the following and can be modied through
the second installer parameter (P2).
Note: When going into parameter P1, the controller
will reset the maximum temperatures (MT) detected
until that moment. Furthermore, when quitting this
parameter, the controller will set again the temperature
display on the sensor S_1.
List of programmable thermal parameters (optional):
Parameters Description
TS1-TS2-TS3 Probe safety temperature
∆T 12 Differential between the probes S1-S2
MTC Adjustment of collector minimum
temperature
MTEN Enabling/disabling the collector minimum
temperature
TM3 Maximum temperature of the probe S3
TAH Integration temperature on the probe S3
HY12 Hysteresis of ∆T 12
HYT Thermostatic hysteresis
HYTS Safety thermostatic hysteresis
WARNING!
The thermal parameters to be set are displayed when
the relevant scheme is selected, this means the power
unit will only display the thermal parameters actually
activated for the selected hydraulic scheme.
CONTROL LOGIC
WARNING: The following control logics must be applied
to all the diagram described hereinafter.
ALARM RELAY
OFF
HYSTE-
RESYS
TS-
ALARM RELAY
ON
°C
ALR RELAY
Control logic
CONTROL LOGIC IN ABC
The control logic of the ‘ABC’ function actually replaces the
differential control.
The checks on the Maximum and Safety temperatures are
always kept active.
The integrative source is switched off when ABC mode is
active.
Once ABC mode is turned off the integrative source will be
automatically activated.
CONTROL LOGIC OF THE SAFETY THERMOSTATS
If an alarm turns on because of an overcoming of the safety
temperature, the alarm relay will be activated.
While the loads outputs will keep on functioning according
to the relative logics.
In this conditions, the control unit emits a beeping audio
signal and on the display will ash the icon “ ”.
The control is not active with the control unit in “OFF” mode
(the display shows the message OFF).
Condition for the alarm relay activation
The logic of the functioning of the alarm relay , always
present in every diagram selected, runs with the following
conditions:
TX- ≥ TS- = Alarm relay ON
TX- ≤ (TS- – hysteresys) = Alarm relay OFF
Where:
TX-: Temperature picked up by the connected sensors
(S1 .. S3).
TS-: Safety temperature related to the sensors (S1 .. S3).
ABC
MANUALE
T/ABC
IN PARALLELO AL CONTROLLO DEL T
/10
ABC
MANUAL
E
T/ABC
IN PARALLELO AL CONTROLLO DEL T
/10
PRESS THE ‘ esc ’ KEY TO RETURN TO THE INSTALLER
PARAMETERS SELECTION.

WAIT 20 SECONDS OR PRESS THE ‘ esc ’ KEY TO EXIT
THE INSTALLER MODE.

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SCH 04
Solar heating installation with 1 tank, direct
integration by means of valve logic.
Control logic
OUT 1
TS2
TS3
TS1T1-2
TM3
TAF
AFR
/10
OUT 2
TA
HTAH
OUT 3
SCH 03
Pool solar heating installation.
Control logic
1/0
AFR
TAF
T1-2
TM3
TS1
TS3
TS2
OUT 1
SCH 02
Solar heating installation with 1 tank and additional
thermostatic heating.
Control logic
OUT 1
TS2
TS3
TS1T1-2
TM3
TAF
AFR
/10
OUT 2
TA
HTAH
OUT 3
SCH 06
Solar heating installation with 1 tank and only 2 probe.
Control logic
SCH 05
Natural circulation solar heating installation with 1 tank
and direct integration by means of valve logic.
Control logic
TAH
OUT 1
TAH
OUT 2
SCH 01
Solar heating installation with 1 tank and no
integrative heat source.
Control logic
1/0
AFR
TAF
T1-2
TM3
TS1
TS3
TS2
OUT 1
AVAILABLE DIAGRAMS

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AFTER SELECTING PARAMETER P2 PRESS THE ‘ ‘
KEY.

USING THE ‘ OR ‘ ‘ ARROWS IT IS POSSIBLE TO
SCROLL CYCLICALLY THROUGH THE THERMAL DATA:
- Safety temperatures
- Differentials
- Hysteresis of the differentials
- Hysteresis of the safety thermostats
- Hysteresis of the thermostats
- Offset
- Maximum temperatures
- Integration temperature
- ABC (Automatic Boiler Control) temperature

PRESS THE ‘ ‘ TO MODIFY THE THERMAL DATA
SELECTED; THE DATA WILL START FLASHING.


SET THE DESIRED NUMERIC VALUE USING
THE ‘ ‘ OR ‘ ‘ ARROWS.
P2: SETTING THE THERMAL DATA
Using this parameter it is possible to set the thermal data
related to the selected installation:
Note: The control unit is supplied with pre-programmed
thermal data for optimal operation. Any change to
these values must be performed by qualied personnel
only.
When changing the hydraulic scheme by means of the
parameter P1, the thermal values (TS, TM, TAH and
TABC) already set will be reset at the default values.
PRESS THE ‘ ‘ KEY TO CONFIRM THE
PROGRAMMED SETTINGS OR PRESS THE ‘ esc ’ KEY
TO CANCEL THE CHANGES.
In the following the regulation ranges allowed for each
parameter are listed.
WARNING!
The thermal parameters to be set are displayed when
the relevant scheme is selected, this means the power
unit will only display the thermal parameters actually
activated for the selected hydraulic scheme.
Probe safety temperatures
Data Regulation range Default
TS1 60.0 .. 240.0 °C 140.0 °C
TS2 20.0 .. 90.0 °C 80.0 °C
TS3 20.0 .. 90.0 °C 80.0 °C
WARNING!
It is not possible to set the Safety Temperatures TS2
and TS3 to a value lower than the relevant Maximum
Temperature, as the value of the Safety Temperature
is limited to the value of the Maximum Temperature
+5°C. To lower the Safety Temperature, it is rst
necessary to decrease the Maximum Temperature and
then set the Safety Temperature to the desired value.
If the Safety Temperature is displayed but the relevant
Maximum Temperature is not, then the Safety
Temperature will be limited according to the Maximum
Temperature operating in the current scheme (i.e. in
scheme no.1, the value of the TS2 safety temperature
will be limited according to the value of the TM3
maximum temperature). Should the hydraulic scheme
be changed and SCH5 scheme previously activated, all
the Safety and Maximum temperatures will be set at
the factory-set default values.
Differential between the probes S1-S2 (∆T12)
Data Regulation range Default
∆T12 1.0 .. 20.0°C 8.0 °C
WARNING!
It is not possible to set the Differential to a value lower
than the relevant hysteresis because the value of the
Differential is limited to the value of the hysteresis
+1°C. To lower the Differential it is rst necessary to
decrease the value of the hysteresis.
Hysteresis of the differential ∆12
Data Regulation range Default
HY12 1.0 .. 15.0°C 4.0 °C
WARNING!
It is not possible to set the Hysteresis (HY) to a value
higher than the relevant Differential (∆T), because
the value of the hysteresis is limited to the value of
the Differential -1°C. To increase the value of the
Hysteresis it is rst necessary to increase the value of
the Differential (∆T).