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

2TDST24M000SE 032635 190619
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

3TDST24M000SE 032635 190619
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

4TDST24M000SE 032635 190619
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

5TDST24M000SE 032635 190619
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).

6TDST24M000SE 032635 190619
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.

7TDST24M000SE 032635 190619
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.


8TDST24M000SE 032635 190619
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.

9TDST24M000SE 032635 190619
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

10 TDST24M000SE 032635 190619
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).

11 TDST24M000SE 032635 190619
Hysteresis of the safety temperatures
Data Regulation range Default
HYTS 1.0 .. 15.0 °C 2.0 °C
Thermostatic hysteresis
Data Regulation range Default
HYT 1.0 .. 15.0 °C 2.0 °C
Probe Offset
Data Regulation range Default
OS1 -5.0 .. +5.0 °C 0.0 °C
OS2 -5.0 .. +5.0 °C 0.0 °C
OS3 -5.0 .. +5.0 °C 0.0 °C
Maximum temperature of the probes S2 (TM2) o S3 (TM3)
Data Regulation range Default
TM2 20.0 .. 90.0 °C 70.0 °C
TM3 20.0 .. 90.0 °C 70.0 °C
WARNING!
It is not possible to set the Maximum Temperature (TM)
to a value higher than the relevant Safety Temperature,
as the Maximum Temperature value is limited to the
value of the Safety Temperature (TS) -5°C.
To increase the Maximum Temperature value, it is
rst necessary to increase the value of the Safety
Temperature.
Integration Temperature (After Heating) on probe S3
Data Regulation range Default
TAH 20.0 .. 90.0 °C 45.0 °C
WARNING!
It is not possible to set the value of the integration
temperature (TAH) at a value which is higher than
the Maximum Temperature (TM3) because the value
of the integration temperature (TAH) is linked to the
Maximum Temperature (TM3) -5°C.
In order to lower the value of the Maximum
Temperature (TM3) below the value of the integration
temperature (TAH) already set, rst of all lower the
value of the integration temperature (TAH), then
change the Maximum Temperature (TM3).
ABC Temperature (Automatic Boiler Control) on probe
S3
Data Regulation range Default
TABC 20.0 .. 80.0 °C 30.0 °C

12 TDST24M000SE 032635 190619
Antifrost temperature
Data Regulation range Default
TAF -10.0°C .. +10.0 °C 4.0 °C
Collector pump ‘on’ time
Data Regulation range Default
P OF 1 .. 60 min. 20 min.
Collector pump ‘off’ time
Data Regulation range Default
P ON 5 .. 60 sec. 10 sec.
Antifrost test duration
Data Regulation range Default
TMR 5 .. 60 sec. 10 sec.
IT IS POSSIBLE TO SCROLL CYCLICALLY THROUGH
ANTIFROST DATA USING THE ‘ ‘ OR ‘ ‘ ARROWS:
- Antifrost temperature ‘ TAF ’
- Collector pump ignition interval ‘ P ON ’
- Collector pump shut off interval ‘ P OF ’
- Antifrost test duration ‘ TMR ’

AFTER SELECTING PARAMETER P3 PRESS
THE ‘ ‘ KEY.


USE THE ‘ ‘ OR ‘ ‘ ARROWS TO SET THE
DESIRED NUMERIC VALUE.
PRESS THE ‘ ‘ KEY TO CONFIRM THE PROGRAMMING
OR PRESS THE ‘ esc ’ KEY TO CANCEL THE CHANGES.

PRESS THE ‘ ‘ KEY TO MODIFY THE THERMAL DATA
SELECTED; THE DATA WILL START FLASHING.

BY PRESSING THE ‘ ‘ KEY AFTER MODIFYING
THE DATA RELATIVE TO THE DURATION OF THE
ANTIFROST TEST, THE CONTROL UNIT WILL CONFIRM
THE DATA AND WILL START THE TEST.
P3: ANTIFROST PARAMETER MANAGEMENT
Using this parameter it is possible to set the data managing
the antifrost function.
The control unit is supplied with preset antifrost data
for optimal operation.
Any change to these values must be performed by
qualied personnel only.
In the following the regulation ranges allowed for each
parameter are listed.

13 TDST24M000SE 032635 190619
P4: ACOUSTIC SIGNAL MANAGEMENT
Using this parameter it is possible to enable or disable the
acoustic signalling of the control unit (keyboard tones,
alarms, and diagnostics).
Enable (1)/Disable (0) acoustic signal
Data Regulation range Default
BEEP Off .. On On
Note: ‘on’ enables acoustic signalling, while ‘off’
disables it.

SELECT THE DESIRED OUTPUT AND
PRESS THE ‘ ‘ KEY.
CHANGE THE OUTPUT LOGIC USING
THE ‘ ‘ or ‘ ‘ ARROWS.

PRESS THE ‘ ‘ KEY TO CONFIRM THE PROGRAMMING
OR PRESS THE ‘ esc ’ KEY TO CANCEL THE CHANGES.
Output logic for OUT 2
Data Regulation range Default
OUT 2 0 .. 1 1
If the function is not supported by the layout selected the
controller will display ‘NONE’.
Note: ‘1’ means Normally Open (N.O.) logic, while ‘0’
means Normally Closed (N.C.) logic.
AFTER SELECTING PARAMETER P5 PRESS
THE ‘ ‘ KEY.

USING THE ‘ ‘ or ‘ ‘ ARROWS IT IS POSSIBLE TO
SCROLL THROUGH THE ACTIVE OUTPUTS.

P5: RELAY LOGIC SELECTION
Using this parameter it is possible to reverse the output logic
from Normally Open (N.O.) to Normally Closed (N.C.) and
vice- versa. It is only possible to modify the output logic for
the relays actually active in the selected setup.
Value ‘1’ for these parameters means that the output logic is
reset to the N.O. value (default).
OUT 2 is the only output for which the output logic can be
changed.
If the controller displays ‘NONE’ it means that ‘OUT2’ is not
provided for in the selected layout.

14 TDST24M000SE 032635 190619
The counter recording the running hours of the integrative
source can handle values up to 9999.
Once the maximum value is reached the counter stops.
PRESSING THE ‘ ‘ KEY RESETS THE COUNTER,
PRESSING THE ‘ esc ’ AGAIN SHOWS THE CURRENT
RUNNING HOURS.

PRESS THE ‘ ‘ KEY , THE DISPLAY
SHOWS ‘H’ FLASHING.
THE DISPLAY SHOWS ‘H’ AND ACTUAL HOURS OF
ACTIVITY OF THE INTEGRATIVE SOURCE.

AFTER SELECTING PARAMETER P6 PRESS THE ‘ ‘
KEY.

P6: INTEGRATION HOURS COUNTER
Using this parameter it is possible to display the actual
number of hours of the integrative source operation or reset
it.
P7: LIMITATION OF COLLECTOR MINIMUM
TEMPERATURE
The parameter ‘Minimum Temperature Limitation’ on
collector is used to manage the Minimum Temperature
Thermostat used for activation of the collector pumps.
This thermostat stops the pumps operation whenever on the
relevant panel is measured a temperature lower than the one
set in this parameter.
The function ‘Minimum Temperature Limitation’ is not active
when in ABC operation or in case the pumps activation is
caused by the intervention of Recooling or similar functions.
AFTER SELECTING PARAMETER P7 PRESS
THE ‘ ‘ KEY.

WITH ARROWS ‘ ‘ OR ‘ ‘, YOU CAN CYCLE AMONG
THE FOLLWOWING THERMAL DATA FOR REGULATION:
- Setting of the collector minimum temperature ‘ MTC ‘
- Enabling/Disabling of the minimum
temperature limitation ‘ MTEN ‘

PRESS THE ‘ ‘ KEY TO MODIFY THE THERMAL DATA
SELECTED; THE DATA WILL START FLASHING.


USE THE ‘ ‘ OR ‘ ‘ ARROWS TO SET THE
DESIRED NUMERIC VALUE.
PRESS THE ‘ ‘ KEY TO CONFIRM THE
PROGRAMMING OR PRESS THE ‘ esc ’ KEY TO CANCEL
THE CHANGES.
Adjustment of collector minimum temperature
Data Regulation range Default
MTC 10.0°C .. 90.0°C 10.0 °C
Enabling/disabling the collector minimum temperature
Data Regulation range Default
MTEN 0 .. 1 0
Note: with ‘ 0 ‘ the limitation of minimum temperature
on collector is disabled, while with ‘ 1 ‘ it is
enabled.

15 TDST24M000SE 032635 190619
P8: PWM and 0..10V OUTPUT SETTINGS
With this parameter you can change the settings which
control the pump connected to the PWM or 0..10V output
of the control unit.
AFTER SELECTING PARAMETER P8 PRESS
THE ‘ ‘ KEY.

WITH ARROWS ‘ ‘ OR ‘ ‘, YOU CAN CYCLE AMONG
THE FOLLWOWING THERMAL DATA FOR REGULATION:
- Type of pump connected ‘ PUMP ‘
- Operating mode logic ‘ MODO ‘
- Pump speed control time ‘ TIME ‘
- Fixed point temperature control ‘ T_FT ‘
In the following are listed the parameters whose default
value varies depending on whether the parameter
‘ PUMP ’ is set to ‘ REV ’ (PWM1 / R010V) or ‘ NOR ’
(PWM2 / N010V):
- % PWM to turn the pump off ‘ %OFF ‘
- % PWM to turn the pump on and
drive it at maximum speed ‘ %ON ‘
- % PWM to drive the pump
at maximum speed ‘ %MAX ‘
- Pump ow with PWM = %ON ‘ %FMN ‘
- 0V .. 10V voltage level to turn the pump off ‘ VOFF ‘
- 0V .. 10V voltage level to turn the pump on
and drive it at minimum speed ‘ VON ‘
- 0V .. 10V voltage level to drive the pump at
Maximum speed with 100% ow ‘ VMAX ‘
- Pump ow with 0..10V = VON ‘ VFMN ‘

PRESS THE ‘ ‘ KEY TO MODIFY THE THERMAL DATA
SELECTED; THE DATA WILL START FLASHING.


USE THE ‘ ‘ OR ‘ ‘ ARROWS TO SET THE
DESIRED NUMERIC VALUE.
PRESS THE ‘ ‘ KEY TO CONFIRM THE
PROGRAMMING OR PRESS THE ‘ esc ’ KEY TO CANCEL
THE CHANGES.
In the following the regulation ranges allowed for each
parameter are listed.
Setting the connected pump functioning logic
Data Regulation range Default
PUMP REV .. NOR NOR
Settings details
‘REV’ setting
PWM output:
The pump connected on the PWM output works according to
the “PWM1“ standard, or heating logic, also said ‘reversed’.
With the PWM output at minimum value (0%) the pump runs
at full speed, while with the PWM output at maximum value
(100%) the pump runs at minimum speed. Of course the
pump will operate to all the intermediate speeds through the
modulation of the PWM signal between 0% and 100%.
0..10V output:
The pump connected on the 0..10V output works according
to the 0V .. 10V ‘reversed’ standard (R010V). With the 0V
..10V output at minimum value (0V) the pump runs at full
speed, while with the 0V ..10V output at maximum value
(10V) the pump runs at minimum speed. Of course the pump
will operate to all the intermediate speeds through the
modulation of the 0 .. 10V signal between 0V and 10V.
‘NOR’ setting
PWM output:
The pump connected on the PWM output works according
to the “PWM2“ standard, or solar logic, also said ‘normal’.
With the PWM output at minimum value (0%) the pump runs

16 TDST24M000SE 032635 190619
at minimum speed, while with the PWM output at maximum
value (100%) the pump runs at full speed. Of course the
pump will operate to all the intermediate speeds through the
modulation of the PWM signal between 0% and 100%.
0..10V output:
The pump connected on the 0..10V output works according
to the 0V .. 10V ‘normal’ standard (N010V). With the 0V
..10V output at minimum value (0V) the pump runs at
minimum sped, while with the 0V ..10V output at maximum
value (10V) the pump runs at full speed. Of course the pump
will operate to all the intermediate speeds through the
modulation of the 0 .. 10V signal between 0V and 10V.
Setting the regulation mode of the PWM pump
Data Regulation range Default
MODO MPT / MFT / MdT MPT
Settings details
Setting MPT (differential proportional mode)
The proportional regulation of the collector pump speed is
performed, by confronting the measured temperature ∆Tr
(Collector Temp. - Boiler Temp.) with the temperature ∆T set
by the installer parameter P2. The sampling of the variables
to control the speed of the collector pump is performed every
500 milliseconds.
If the control unit is set with the ABC function activated,
the collector pump speed, if it is ON, will be equal to the set
value %MAX or VMAX, while, if it is OFF, will be equal to the
set value %OFF or VOFF.
If the collector pump is switched on after the intervention of
the ABC function, the regulation of the pump rotation speed
WILL NOT be proportional to ∆Tr.
The proportional regulation of the collector pump speed to
∆Tr, is taking into account the functioning logic (REV or
NOR) set by the parameter ERP P8 - PUMP:
When parameter PUMP = NOR (PWM2)
∆Tr < 0: The pump takes its speed at level
%OFF or VOFF.
0 ≤ ∆Tr < ∆T: The pump will have a variable rotation
speed between %ON and %MAX or
between VON and VMAX, depending
on the comparison of ∆Tr and ∆T.
∆Tr ≥ ∆T: The pump will have a rotation speed
equal to %MAX or VMAX.
To set the reference data, see parameter P8 - Parameters related
to PWM (PWM2) or 0..10V (N010V) output.
When parameter PUMP = REV (PWM1)
∆Tr < 0: The pump takes its speed at level %OFF
or VOFF.
0 ≤ ∆Tr ≤ ∆T: The pump will have a variable rotation
speed between %ON and %MAX or
between VON and VMAX, depending on
the comparison of ∆Tr and ∆T.
∆Tr > ∆T: The pump will have a rotation speed
equal to %MAX or VMAX.
To set the reference data, see the parameter P8 - Parameters
related to PWM (PWM1)or 0..10V (R010V) output.
MFT settings (xed mode)
The regulation of the collector pump speed is performed
referring the regulation to the temperature value T_FT (Fixed
point temperature control).
If the temperature on the reference sensor (collector) is
higher than the set value T_FT, then the collector pump
speed raises until reaching the maximum value only after the
‘TIME’ control has elapsed.
If the temperature measured by the reference sensor
(collector) is lower than the value set for T_FT, then the
speed is decreased down to the minimum value only after the
‘TIME’ control time has elapsed.
MdT settings (differential mode)
The regulation of the collector pump speed is performed,
by confronting the measured differential temperature
∆Tr (Collector Temp. - Boiler Temp.) with the differential
temperature ∆T set by the installer parameter P2.
If the measured differential temperature (∆Tr) between the
collector and accumulation probes is higher than the set
temperature differential (∆T) for the solar regulation, the

17 TDST24M000SE 032635 190619
collector pump speed raises gradually until it reaches the
maximum set speed only after the ‘ TIME ’ period control
has elapsed.
If the differential temperature (∆Tr) measured between
the reference sensors is lower than the set differential
temperature (∆T) for the solar regulation, so the collector
pump speed is reduced until the minimum set speed is
reached only after the ‘ TIME ’ period control has elapsed.
If the central unit lowers the collector pump speed until
it reaches the minimum value %ON or VON and the ∆Tr
(differential between the sensors) is still lower than the set
∆T, so the pump turns OFF taking itself to the level %OFF
or VOFF.
Collector pump speed control time
Data Regulation range Default
TIME 1 .. 15 minuti 4 minuti
TIME parameter detail
Sets the maximum time used to drive the pump from the
minimum to maximum speed and vice versa, in order to
prevent abrupt changes or oscillations in the system
regulation.
Fixed mode temperature control
Data Regulation range Default
T_FT 0 °C .. 90 °C 60 °C
Note: this parameter is active only when the option
MFT is selected under ‘MODE’ parameter.
In the following are listed the parameters and relevant default values
when parameter ‘ PUMP ’ is set to ‘ REV ’
Data Regulation range Default
Parameters for PWM (PWM1) output
%OFF %ON .. 100% 100%
%ON %MAX .. %OFF 90%
%MAX 0% .. 50% 0%
%FMN 0% .. 100% 30%
Parameters for 0..10V (R010V) output
VOFF VON .. 10,0V 9,0V
VON VMAX .. VOFF 9,0V
VMAX 0,0V .. 5,0V 0,0V
VFMN 0% .. 100% 30%
In the following are listed the parameters and relevant default
values when parameter ‘ PUMP ’ is set to ‘ NOR ’
Data Regulation range Default
Parameters for PWM (PWM2) output
%OFF 0% .. %ON 0%
%ON %OFF .. %MAX 10%
%MAX 50% .. 100% 100%
%FMN 0% .. 100% 30%
Parameters for 0..10V (N010V) output
VOFF VON .. 10,0V 9,0V
VON VMAX .. VOFF 9,0V
VMAX 0,0V .. 5,0V 0,0V
VFMN 0% .. 100% 30%
P9: COLLECTOR RESET TEMPERATURE
With this parameter you can set the ‘T_SF’ temperature
value used for the collector pump reset when the TS_2

18 TDST24M000SE 032635 190619
safety temperature is reached, in order to avoid thermal
shock and air pockets in the system.
The collector pump will automatically restart only if the
collector temperature measured with sensor TS_1 is below
the T_SF collector reset temperature.
Collector reset temperature
AFTER SELECTING PARAMETER P10 PRESS
THE ‘ ‘ KEY.

WITH ARROWS ‘ ‘ OR ‘ ‘, YOU CAN CYCLE AMONG
THE FOLLWOWING DATA FOR REGULATION:
- Enable parameter ‘ ENA ‘
- Increase temperature ‘ INC ’
- Pump activation lapse ‘ TIME ’

PRESS THE ‘ ‘ KEY TO MODIFY THE DATA
SELECTED; THE DATA WILL START FLASHING.


USE THE ‘ ‘ OR ‘ ‘, ARROWS TO SET THE
DESIRED NUMERIC VALUE.
PRESS THE ‘ ‘ KEY TO CONFIRM THE
PROGRAMMING OR PRESS THE ‘ esc ’ KEY TO
CANCEL THE CHANGES.
P10: VACUUM TUBES
In some solar systems, for example when vacuum tubes are
installed, the collector temperature measurement could be
slow, because of its non optimal position.
By enabling the function you can choose between two
different operating programs:
P_1 where VTC function is enabled and Boiler safety
thermostats are prioritized.
P_0 where VTC function is enabled and both Boiler and
collector pump safety thermostats are disabled.
By enabling the VTC, the following collector pump control
is started:
If the collector sensor temperature increases by the amount
set in the subparameter ‘INC’ within one minute, then the
collector pump will be operated for the time set in the
subparameter ‘TIME’.
After the activation of the pump for the time set in the
subparameter ‘TIME’, the function will be off for 5 minutes.
PRESS ARROWS ‘ ‘ and ‘ ‘ TO SET
THE DESIRED VALUE.

PRESS THE ‘ ‘ KEY TO CONFIRM THE
PROGRAMMING OR PRESS THE ‘ esc ’ KEY TO CANCEL
THE CHANGES.
AFTER SELECTING PARAMETER P9 PRESS
THE ‘ ‘ KEY.

THE DISPLAY SHOWS ‘ T_SF ’.


PRESS ‘ ‘. THE DISPLAY
SHOWS ‘T_SF’ FLASHING.
Data Regulation range Default
T_SF OFF / 60 °C .. 180 °C OFF

19 TDST24M000SE 032635 190619
Enable parameter
Data Regulation range Default
ENA OFF / P_1 / P_0 OFF
WARNING!
By enabling parameter ‘ENA’ in ‘P_0’, the boiler
safety thermostats are disabled and consequently
the boiler temperatures could exceed the safety
thresholds set.
Increase temperature
Data Regulation range Default
INC 1 °C/min. .. 10 °C/min. 3°C/min.
Pump activation lapse
Data Regulation range Default
TIME 2 sec. .. 30 sec. 5 sec.
PRESS THE ‘ ‘ KEY TO ENTER SELECTED
PARAMETER SETTINGS;
THE PARAMETER STARTS TO BLINK.

AFTER SELECTING PARAMETER P11 PRESS
THE ‘ ‘ KEY.

WITH THE ARROWS ‘ ‘ OR ‘ ‘, YOU CAN SCROLL
CYCLICALLY THROUGH THE FOLLOWING SETTING
PARAMETERS:
- Enabling the anti-legionella function ‘ EN L ‘
- Alarm reset ‘ RS L ‘


WITH THE ARROWS ‘ ‘ OR ‘ ‘, ENABLE / DISABLE
THE SELECTED PARAMETER.
PRESS THE ‘ ‘ KEY TO CONFIRM THE
PROGRAMMING OR PRESS THE ‘ esc ’ KEY TO CANCEL
THE CHANGES.
P11: ANTI-LEGIONELLA
Through this parameter you can enable or disable the Anti-
legionella function.
The anti-Legionella (function activated by default) consists
of a boiler’s water heating cycle at 65°C every 30 days for
5 minutes (in order to carry out thermal disinfection action
against the related bacteria) only in case the water in the
tank has not been driven at least once at 65°C for 5 minutes
without interruptions.
The 30-day counter is reset whenever the water temperature
in the boiler reaches 65°C at least for 5 minutes.
If the water, during the heating cycle in the boiler, does
not reach 65°C for 5 minutes within one hour, the control
unit emits an acoustic signal and the display shows, on the
hydraulic diagram, the icon of a ashing boiler. In this alarm
situation, the control unit forces the water heating in the
boiler and if that succeeds automatically resets the alarm.
Otherwise, after entering the parameter P16 “LEG” select
the sub-parameter “RS L”; the control unit exits from the
alarm condition resetting the 30-day counter.
The Anti-Legionella function can be enabled only for hydraulic
schemes which provide additional heating:
diagrams 02 - 04 - 05 (selectable in the installer parameter
P1).

20 TDST24M000SE 032635 190619
The setting ranges for each individual dataare listed below.
Enabling the anti-legionella function
Data Regulation range Default
EN L 0 .. 1 1
Note: with ‘0’, the function is disabled, while with
‘1’ the function is activated.
Alarm Reset / Reset of the 30-days counter.
Data Regulation range Default
RS L 0 .. 1 0
Note: Selecting ‘1’ the control unit exits from the
alarm mode, resetting the 30 days’ counter.
WARNING!
- When the Anti-Legionella function is enabled, both
maximum TM and safety TS temperatures, if they are
lower, are automatically set to the following values:
TM-: TLEG + 5.0°C
TS-: TLEG + 10°C
- The temperature value of anti-Legionella is xed to
65°C, therefore not adjustable.
- The differential value is xedto 2°C, therefore not
adjustable.
FUNCTIONS ACCESSIBLE TO THE USER
The functions accessible to the user are limited and do
not allow setting those data inuencing the installation
management.
The only operations allowed to the user are the following:
Turning on / Turning off the control unit
Enabling / Disabling ABC function in the control unit.
User menu
PRESS THE ‘ esc ‘ KEY TO RETURN TO THE USER
PARAMETERS SELECTION MENU.

WAIT 20 SECONDS OR PRESS THE ‘ esc ’ KEY TO QUIT
THE USER MODE.
PRESS THE ‘ ‘ KEY TO ACCESS
‘ USER PARAMETERS ’.

THE FIRST ‘ USER PARAMETER ’
IS SHOWN.

USING THE ‘ ‘ OR ‘ ‘ ARROWS IT IS POSSIBLE TO
SCROLL CYCLICLALLY THROUGH THE USER
PARAMETERS:
U1: SHOWS MAXIMUM TEMPERATURES
U2: ENABLES / DISABLES ANTIFROST

PRESS THE ‘ ‘ KEY TO SELECT THE
DESIRED PARAMETER.

SET THE DESIRED VALUE FOR EVERY SINGLE
PARAMETER AS EXPLAINED BELOW.

WARNING!
In the ‘ USER PARAMETERS ‘ mode all the outputs are
disabled.