digital control unit for thermal solar …...digital control unit for thermal solar systems with...

DIGITAL CONTROL UNIT FOR THERMAL SOLAR SYSTEMSWith variable speed of the collector pumps, flowmeter, calculation of energy produced and chronostat function.

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OVERVIEWThis device is a regulator for the control of solar thermal systems with the following features:- variable speed of the collector pumps (OUT 1 and OUT 2)- controlling the outputs dedicated to the integrative source

by daily hourly programming (timed thermostat function).- Calculating the energy produced.Supplied with 4 outputs (3 Load Relays + 1 Alarm Relays) and 5 Inputs (Probes) + 1 flowmeter input, it is able to manage a system configuration that can be selected among 18 common types of layouts. When a specific 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.The power unit permits to reset the factory-set default data; for further information see the parameter P11 ‘UNIT’.

DIMENSIONS

TECHNICAL FEATURESPower supply: 230V~ ±10% 50Hz

Power absorption: 4 VASensors type: 4 x Pt1000 Class B DINSensor operating range: -50 °C .. +200 °C (collector) -50 °C .. +110 °C (elsewhere)Temperature reading range: -40,0°C .. 260,0°CAccuracy: ± 1 °CResolution: 0,1 °C (0,2 °F)Offset adjustment: on S1: ±5.0°C on S2: ±5.0°C on S3: ±5.0°C on S4: ±5.0°C su S5 (SRT): ±5.0°C (if probe connected)Installer Password: 0000 .. 9999 (default 0000)Acoustic Signal: On/Off (default On)Backlight timing: 20 sec from last keypressOUT2 Relay Logic: NOR=N.O. REV=N.C. non modifiable logic for EAST/

WEST type layouts (N.O. default)OUT3 Relay Logic: NOR=N.O. REV=N.C. (default N.O.)Output relay contacts rating: 1x2(1)A max @ 230V~(SPST) 2x2(1)A @ 230V~(45 .. 65 Hz) Contacts powered.Alarm relay contacts rating: 2(1)A max @ 230V~(SPDT)Protection grade: IP 40Operating temp. range: 0°C .. 40°CStorage temp. range: -10°C .. +50°CHumidity limits: 20% .. 80% RH non-condensing

156 mm

108

mm

46.5 mm

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Case: Material: ABS V0 self-extinguishing Color: Signal White (RAL 9003)Weight: ~691 gr. (version with probe) ~609 gr. (version without probe)Installation: Wall-mount

NORMATIVE REFERENCESThe product complies with the following standards (EMC 2004/108/EC and LVD 2006/95/EC):CEI-EN-60730-1 (2002)CEI-EN-60730-2-9 (1997)

AVAILABLE ACCESSORIES AND SPARESAccessories for free contacts: 2 x 230V~ inputs and 2 free voltage outputs.Pt1000 probe -50°C .. +200°C grey cable.Pt1000 probe -50°C .. +110°C blue cable.Brass pocket 1/2” 7x38mmHuba Control pulse flowmeter, DN15, DN20 or DN25Reed flowmeterUSB / RS485 adapterRS485 / ETHERNET adapter

WARRANTYIn the view of a constant development of their products, the manufacturer reserves the right for changing technical data and features without prior notice. The consumer is guaranteed against any lack of conformity according to the European Directive 1999/44/EC as well as to the manufacturer’s document about the warranty policy. The full text of warranty is available on request from the seller.

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INSTALLATION

TO INSTALL THE DEVICE, PERFORM THE FOLLOWING OPERATIONS:

1 Remove the central screw and the plastic door.

The installation technician shall operate in full compliance with all the applicable technical standards in order to grant the unit safety.Before wiring the appliance be sure to turn the mains power off.

WARNING

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3 ASSEMBLY 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 fit the blocks delivered (see point 6).

Fit the cover again with the electronics at the base.5

2 Remove the two screws shown in the drawing, then remove the whole body from the base.

4 Fix the power unit base to the wall.

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ASSEMBLY WITH CABLE INPUT FROM LOWER SIDE: fit the cable fasteners and/or the blocks delivered with the unit.

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Make the electrical connections, following the layout of page 6.

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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).

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WIRING DIAGRAM

Before wiring the appliance be sure to turn the mains power off.The outputs OUT 1, OUT 2 e OUT 3 are powered (230V~).In order to check that the device is working correctly it is necessary for the loads to be connected.The return probe S5 (S_RT) and the flowmeter need not be connected.

? WARNING!

DIGITALFLOWMETERHuba Control

Connection example of a REED flowmeter with a suitable rate of flow.

FUSE 10A

SO

LID

S

TATE

SO

LID

S

TATE

L3N N NL2 L1 NC NO N LCALARMOUT 1OUT 2OUT 3 230V~

±10%50Hz*

* : The communication port at terminals A and B is available only on the model featuring S-Bus serial communication over RS485.

The specifications of the S-Bus communication protocol over RS485 line are available from the distributor or manufacturer.

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S4 probe must be connected to the second collector; in this case, only use a probe with a range of -50°C .. +200°C.

S5: Probe that measures the temperature of the return liquid for calculating the quantity of energy produced. It is to be connected to the system return pipe; this probe need not be connected in which case, in order to calculate the energy produced, the temperature measured by the probe connected to the bottom of the boiler will be used as a reference. This probe is shown on the display as S_RT.

POWER SUPPLY:It is advisable to fit 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.LOADS:The relay outputs relative to 1, 2, 3, 4 loads are powered (230V~); the output of the auxiliary alarm relay is changeover type (SPDT) with voltage free contacts.PROBE:S1, S2, S3 and S4 are Pt1000 temperature sensors:S1: Probe to connect to the collector; a probe must be used

with a range of -50°C..+200°C (probe supplied with a grey cable).

S2: Probe to be connected, for example, to the bottom of the boiler; use a probe with a range of -50°C..+110°C (probe supplied with a blue cable).

S3: Probe to be connected, for example, to the top of the boiler; use a probe with a range of -50°C..+110°C (probe supplied with a blue cable).

S4: Probe to be connected, for example, to the bottom of the second boiler (if contemplated in the layout); use a probe with a range of -50°C..+110°C (probe supplied with a blue cable).

If EAST/WEST type solar systems are going to be set up, the

For proper operation of the regulator it is mandatory to ensure that the temperature sensor is correctly reading the temperature value. For this purpose it is strongly recommended to couple the sensor to the relevant pocket taking advantage of thermo-conductive paste (which exhibits high thermal conductivity) and by coupling these two parts firmly together.

WARNING!

FLOWMETER:The control unit is designed for using two types of flowmeter: DIGITAL (also called pulse type) or REED.DIGITAL flowmeter: the control unit only accepts Huba Control brand flowmeters (DN 15, 20, 25).REED flowmeter: the control unit accepts any flowmeter model with a rate of 1l/pulse or 10l/pulse.The flowmeter must be positioned near the return probe S5.

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STARTINGTURNING ON AND OFFTo 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 flash three times.If the control unit reveals no anomalies the red led will remain on, otherwise it will continue to flash quickly and the display will show the type of error.

ACOUSTIC SIGNALSThe 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 ’.

RESETIn order to reset the device, press the key labelled as ‘ RESET ’ located behind the removable door; DO NOT USE PINS OR NEEDLES.

BACKLIGHTBy pressing any key the backlight of the display is activated. The backlight automatically shuts off after about 20 seconds from the last key depressure.

DISPLAYOn the backlight 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.The display also shows several symbols which explain the state of the regulator as well as of the relevant controlled components. Viewing the data measuredThe control unit usually shows the main data measured on the alphanumerical display which can be scrolled cyclically by pressing key ‘ ‘ or ‘ ‘:

DESCRIPTION OF THE KEYS

MENU KEY

CANCEL KEY

MANUAL KEY

CONFIRMATION KEY

SELECTION KEYS

RESET KEY TERMINAL BOARD GROUNDING

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S_1 - S_2 -S_3 - S_4 Probe temperature.

S_RT (S5) Return probe temperature.

%FS1 - %FS2 Collector pump speed (connected to OUT 1 and OUT 2 respectively).

KWh - MWh

Viewing the energy produced expressed in KWh and MWh. The total energy produced will be given by the sum of the two counters (e.g. 815 KWh + 12 MWh = 12,815 MWh).

PC1 - PC2 Collector pump activation time (connected to OUT 1 and OUT 2 respectively).

TIME Current time in the 24h format.

WARNING- The energy will be expressed in KWh + MWh. The counting

of KWh, when reaching 1000 KWh, will be set to zero and the MWh counter will increase by 1. The addition of the two counters will give the total energy produced (i.e. 815 KWh + 12 MWh = 12.15 MWh).

- The KWh and MWh indication blinks when the flowmeter is measuring the flow.

- The control unit displays the PC2 datum only if an EAST/WEST type hydraulic layout has been selected, i.e. with 2 collectors.

- If the return probe S5 is not connected, the control unit displays three dashes indicating the probe is not connected.

Below are the meanings of the symbols that can appear on the display:

Fixed icon Blinking icon

Working normally.The collector pump is activated by the Recooling function.

Antifrost function activated by the user parameter U2.

Antifrost activated (the collector pump is activated).

Control unit working in the manual mode.

The control unit is in the alarm status (the temperature measured by the probes is higher than the set safety temperature).

The control unit has detected a malfunction with the probes.

The ABC function has been activated.

The relative pump is off. The relative pump is working.

The relative probe is connected and working correctly.

The relative probe is not connected or is malfunctioning.

The control unit is in the configuration status.

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Displaying sun / Anti-freezeDuring normal operation, the ‘SUN’ icon will be always lit on the display. When the power unit detects a condition which forces the collector pump to get started , the ‘ SUN ’ icon will be flashing.When the Anti-freeze function is activated, both ‘ SUN ’ and ‘ SNOW ’ icons will be lit; when the power unit detects a temperature which forces the anti-freeze function to get started, the ‘ SNOW ’ icon will also be flashing.

Display of collector pump speedIf the ‘ ‘ or ‘ ‘ keys are pressed during normal operation, the central unit will not only show the temperature as read by the connected probes but it will also display the solar collector pump speed as a percentage.As regards the %FS2 parameter, the power unit will show this parameter set at 0 if the OUT2 outlet is not connected.Alternatively, if the selected installation diagram does not require installation of a collector pump at outlet OUT2, this parameter will only be displayed with the values 0 (outlet N.0.) or 100 (outlet N.C.), i.e. it will work as an ON /OFF type outlet.

TEST FUNCTION FOR LOAD WIRINGS CHECKThrough this function, available at the Installer Parameter P7, the control unit cyclically activates the loads wired to the unit

so that the installer can verify the accuracy of the wirings performed.For more information see the detail of the parameter in ‘TEST P7’ on page 32.

AUTOMATIC / MANUAL / ABC (Automatic Boiler Control) OPERATIONThe control unit can manage the installation selected in 3 different modes:- AUTOMATIC: in this mode the control unit automatically

manages and controls the operation of the installation according to the programmed data.

- MANUAL: the collector pump is continuously powered; the only active controls will be those related to the maximum temperature and safety.

- ABC: this mode is identical to the Manual mode except that the collector pump will be activated only when the temperature of the collector exceeds ‘ T ABC ’ programmed in the relevant installer parameter.

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INSTALLER PARAMETERSTo access the installer parameters press the ‘ ‘ key.

Entering the PasswordThe display will show ‘PWD 0000’ with the leftmost digit flashing 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 confirmed and the flashing is transferred to the following digit.After confirming the last digit, the ‘ ‘ key will give access to the installer parameters.The initial password is factory set as ‘0000’.

Modifying the PasswordIn order to modify the stored password, first press the ‘ ‘ key, then proceed as follows:

Pressing the ‘ esc ’ key at any time will exit the password management mode.

PRESS THE ‘ MENU ’ KEY.

ENTER THE CURRENT PASSWORD.(same procedure described above)

THE DISPLAY SHOWS ‘ PWDN0000 ’.

THE DISPLAY SHOWS ‘ PWDH0000 ’.

INSERT THE NEW PASSWORD.

THE DISPLAY SHOWS ‘ PWDC0000 ‘.

INSERT NEW PASSWORD.

THE CONTROL UNIT WILL MEMORIZE THE NEW PASSWORD

AND GIVE ACCESS TO THE INSTALLER PARAMETERS.

PRESS THE ‘ ‘ KEY ON THE START PAGE.

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List of installer configurable parameters

PARAMETER DESCRIPTION DATA TO SET

‘ SCH P1‘ Choosing the hydraulic layout. 18 hydraulic layouts available.

‘ DATA P2 ‘

Setting the heat data for the system selected.

ATTENTIONThe display of the heat data to set is concomitant with the layout selected, i.e. the control unit only displays the heat data that are actually active for the hydraulic layout selected.

TS1-TS2-TS3-TS4: Safety temperature on the probes∆T 12: Differential between probes S1-S2∆T 13: Differential between probes S1-S3∆T 14: Differential between probes S1-S4∆T 34: Differential between probes S3-S4∆T 42: Differential between probes S4-S2∆T 43: Differential between probes S4-S3HY12: Hysteresis of ∆T 12HY13: Hysteresis of ∆T 13HY14: Hysteresis of ∆T 14HY34: Hysteresis of ∆T 34HY42: Hysteresis of ∆T 42HY43: Hysteresis of ∆T 43HYTS: Safety thermostat hysteresisHYT: Thermostat hysteresisOS1-OS2-OS3-OS4-OSRT: Offset on the probesTM2-TM3-TM4: Maximum temperature on the probesTAH: Integration temperature on probe S3TABC: ABC temperature on probe S3

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‘ O AF P3 ’ Setting data for managing the antifrost function.

TAF: Antifrost temperatureP ON: Collector pump switch-on intervalP OFF: Collector pump switch-off intervalTMR: Duration of the antifrost test

‘ BEEP P4 ‘ Activates or deactivates the control unit’s acoustic signals. BEEP: Activation/Deactivation acoustic signals.

‘ ACT P5 ‘ Inverts the control logic of the relays in the system selected.

OUT 2: OUT2 Output logicOUT 3: OUT3 Output logic

‘ C AH P6 ‘ Displays and/or resets the actual activation hours of the integration source.

H: Displays the counter and, if envisaged, the counter is reset by pressing the ‘ ‘ key.

‘ TMR P7 ‘ Runs the functional test of the loads connected to the control unit. TMR: Setting the test sequence

‘ SEM P8 ‘ Manages accounting of the energy produced.

FLOW: System flow rate in litres/minuteFLT: Type of flowmeter connected to the systemDN: Dimension of the flowmeter connected (in DN)L/P: Litres per pulseAFT: Type of antifrost liquid%AF: Antifrost liquid concentrationRST: Energy counter reset

‘ REF P9 ‘ Setting the data for managing the automatic Boiler cooling function.

TR: Recooling temperature∆TR: Differential of the Recooling temperatureRECEN: Activation/Deactivation of the Recooling function

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‘ PVK P10 ‘Manages the periodical activation of the loads (pumps and valves) on the selected hydraulic layout.

PVK: Periodical activation of the loads

‘ UNIT P11 ‘Setting the unit of measurement: °C or °F, with consequent Resetting of the control unit parameters.

UNIT: Unit of measurement

‘ %FS P12 ‘Setting data that will control the speed of the collector pumps connected to outputs OUT1 and OUT2.

%MN1: Minimum OUT 1 speed as a %%MN2: Minimum OUT 2 speed as a %INC: 10% increase

‘ MTL P13 ‘ Manages the Minimum Thermostat that controls collector pump activation.

MTC: Setting minimum collector temperatureMTEN: Enabling/Disabling minimum temp. limit

‘ TCF P14 ‘ Enables or disables the collector pipe function. TCF: Enabling/Disabling the collector pipe function.

‘ RCC P15 ‘ Resets the hour counter relative to collector pump activation. CC: Resets the hour counter

‘ ALF P16 ‘

Enables or disables the anti-Legionella function, i.e. activates or deactivates integration 30 minutes a day in order to bring boiler water to 65°C to destroy the bacterium.

ALF: Enabling/Disabling the anti-Legionella function

‘ AEB P17 ‘ Automatically controls filling up of all the boilers if there is little heat coming from outside.

AEEN: Function Enabling/DisablingTmWT: Waiting time to fill the next boilerTmMF: Maximum time to fill the next boiler

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WARNING!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.

Using installer parametersInserting the correct Password gives access to the installer parameters change mode (‘ SET ’ icon lights).To facilitate programming simply remember the following rules:The ‘ ‘ key: is used to access the change mode of

the parameter selected and relative data to vary. It is also used to confirm the change made.

The ‘esc’ key: is used to cancel the changes just made, but only if it has not been already confirmed with the ‘ ‘ key; also used to exit the installer parameters.

The ‘‘ or ‘‘ keys: used to scroll the various parameters and to change the data of each one.

USING THE ARROWS ‘ ‘ or ‘ ‘ IT IS POSSIBLE TO CYCLICALLY SCROLL THROUGH THE INSTALLATION

PARAMETERS.

PRESS THE ‘ ‘ KEY TO ACCESS THE CHANGE MODE OF THE PARAMETER SELECTED.

INSERT THE CURRENT PASSWORD (as per procedure).

PRESS THE ‘ ‘ KEY ON THE START PAGE.

‘PWD 0000’ IS DISPLAYED‘ WITH THE FIRST DIGIT ON

THE LEFT BLINKING AND THE SET ICON ON.

THE FIRST ‘INSTALLER PARAMETER’ IS DISPLAYED.

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WAIT 20 SECONDS OR PRESS THE ‘ esc ’ KEY TO EXIT THE INSTALLER MODE.

TO CONFIRM THE CHANGE MADE, PRESS THE ‘ ‘ KEY (the control unit stores the choice made), OTHERWISE, TO

CANCEL THE CHANGE MADE PRESS THE ‘ esc ‘ KEY ‘.

IN THE CASE OF A PARAMETER WITH OTHER DATA TO CONFIGURE, SELECT THE DATA WITH THE ‘ ‘ or ‘ ‘ ARROW KEY AND PRESS THE ‘ ‘ KEY TO ACCESS

THE CHANGE MODE OF THE DATA SELECTED.

WITH THE ‘ ‘ or ‘ ‘ ARROW KEY, CONFIGURE THE DATA OF EACH SINGLE PARAMETER.

WARNING!When going into parameter P1, the controller will reset the maximum temperatures (TM) detected until that moment. Furthermore, when quitting this parameter, the controller will set again the temperature display on the sensor S_1.The thermal parameters (P2) 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.

SCH P1: SELECT INSTALLATION TYPEOne of the 18 available hydraulic layouts can be chosen with this parameter.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.

THE CONTROL UNIT RETURNS TO DISPLAYING THE LIST OF INSTALLER PARAMETERS OR THE LIST OF DATA TO

CONFIGURE.

The 18 hydraulic layouts that can be selected and their functioning logic are described below.

The detail of each single installer parameter is described below.

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AVAILABLE DIAGRAMSSCH 01Solar heating installation with 1 tank and no integrative heat source.

Control logic

WARNING: The following control logics must be applied to all the diagram described hereinafter.

CONTROL LOGIC

CONTROL LOGIC IN MANUAL MODE OR IN ABC

ABC

MANUALE

T/ABC

IN PARALLELO AL CONTROLLO DEL T

/1 0

MANUALE IN PARALLEL TO THE ∆T CONTROL

The control logic concerning the commands of the ‘ABC’ function or the ‘ MANUAL ‘ operation mode takes the place of the differential gear control. The controls concerning the Safety and Maximum temperatures are always active. The integrative source in Manual mode or in ABC is deactivated. It will be automatically reactivated when the above modes are deactivated.

CONTROL LOGIC OF THE SAFETY THERMOSTATS

The control is not active when the unit is in ‘ OFF ‘ status.

ALR RELAY

WARNING!All outputs are 230V~ powered and are NOT potential free.?

Note: S1: probe with a range of -50°C .. +200°C S2, S3: probe with a range of -50°C .. +110°C

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SCH 03Pool solar heating installation.

Control logic

SCH 02Solar heating installation with 1 tank and additional thermostatic heating.

Control logic

WARNING!All outputs are 230V~ powered and are NOT potential free.? WARNING!

All outputs are 230V~ powered and are NOT potential free.?



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SCH 05Natural circulation solar heating installation with 1 tank and direct integration by means of valve logic.

Control logic

SCH 04Solar heating installation with 1 tank, direct integration by means of valve logic.

Control logic





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SCH 07Solar heating installation with 2 tanks, logic valve control, and integrative heat source.

SCH 06Solar heating installation with 2 tanks, valve logic control and no integrative heat source.



Control logic Control logic

Note: S1: probe with a range of -50°C .. +200°C S2, S3, S4: probe with a range of -50°C .. +110°C


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SCH 09Solar heating installation with 1 tank, valve logic control and heat exchanger for pool heating.

Control logic

SCH 08Solar heating installation with 2 tanks, valve logic control, no integrative heat source.



Control logic



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SCH 11Solar heating installation with 1 tank and additional heat source with solid fuel.

Control logic

SCH 10Solar heating installation with 2 tanks, sanitary regulation with thermal exchange and integrative heat source.



Control logic



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SCH 13Solar heating installation with 2 tanks, pump logic.

SCH 12Solar heating installation with 1 tank plus one integrative and one solid fuel heat sources.

Control logic



Control logic



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SCH 15Solar heating installation EAST / WEST, 1 tank and no integrative heat source.

Control logic

SCH 14Solar heating installation with 3 tanks, pump logic.



Control logic

Note: S1,S4: probe with a range of -50°C .. +200°C S2, S3: probe with a range of -50°C .. +110°C


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SCH 17Solar heating installation EAST / WEST, 1 tank, integrative heat source by means of valve logic.

Control logic

SCH 16Solar heating installation EAST / WEST, 1 tank and integrative heat source.

Control logic





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SCH 18Solar heating system with 1 tank, 2 sensors only and supplemental heating excluded.

Control logic

WARNING!All outputs are 230V~ powered and are NOT potential free.?

WARNING!The control unit is supplied with pre-programmed thermal data for optimal operation. Any change to these values must be performed by qualified personnel only.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.

DATA P2: SETTING THE THERMAL DATAThe heat data for the system selected can be configured with this parameter.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.

In the following the regulation ranges allowed for each parameter are listed.

Note: S1: probe with a range of -50°C .. +200°C S2: probe with a range of -50°C .. +110°C

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Safety temperaturesData Regulation range DefaultTS1 60.0 .. 240.0 °C 140.0 °CTS2 40.0 .. 90.0 °C 90.0 °CTS3 40.0 .. 90.0 °C 90.0 °C

TS4 1 40.0 .. 90.0 °C 90.0 °CTS4 2 60.0 .. 240.0 °C 140.0 °C

WARNING!If the layout chosen has just one collector, the safety temperature default value TS4 will be 90°C (1) but if an EAST/WEST type layout is chosen then it will be set automatically at 140°C (2).When changing from a two-collector scheme to one-collector scheme and the maximum temperature (TM4) is higher or equal to 85°C, the safety temperature (TS4) will be automatically limited to the value TM4 + 5°C.It is not possible to set the Safety Temperatures TS2, TS3, TS4 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 first 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 highest Maximum Temperature operating in the current scheme (i.e. in scheme no.6, the value of the TS2 safety temperature will be limited according to the value of the TM3 maximum temperature if this is higher than TM4).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.

DifferentialData Regulation range Default

∆T12 1.0 .. 25.0°C 8.0 °C∆T14 1.0 .. 25.0°C 6.0 °C∆T34 1.0 .. 25.0°C 6.0 °C∆T43 1.0 .. 25.0°C 6.0 °C∆T42 1.0 .. 25.0°C 8.0 °C∆T13 1.0 .. 25.0°C 6.0 °C

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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 first necessary to decrease the value of the hysteresis.

Hysteresis of the differentialsData Regulation range Default

HY12 0.5 .. 20.0°C 4.0 °CHY14 0.5 .. 20.0°C 2.0 °CHY34 0.5 .. 20.0°C 2.0 °CHY43 0.5 .. 20.0°C 2.0 °CHY42 0.5 .. 20.0°C 4.0 °CHY13 0.5 .. 20.0°C 2.0 °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 first necessary to increase the value of the Differential (∆T).

Hysteresis of the safety temperaturesData Regulation range DefaultHYTS 1.0 .. 15.0°C 2.0 °C

Thermostatic hysteresisData Regulation range DefaultHYT 1.0 .. 15.0°C 2.0 °C

Probe OffsetData Regulation range DefaultOS1 -5.0 .. +5.0°C 0.0 °COS2 -5.0 .. +5.0°C 0.0 °COS3 -5.0 .. +5.0°C 0.0 °COS4 -5.0 .. +5.0°C 0.0 °C

OSRT -5.0 .. +5.0°C 0.0 °C

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Maximum temperature of the probesData Regulation range DefaultTM2 20.0 .. 90.0°C 70.0 °CTM3 20.0 .. 90.0°C 70.0 °CTM4 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 first necessary to increase the value of the Safety Temperature.

Integration Temperature (After Heating) on probe S3Data Regulation range Default

TAH 40.0 .. (TM3 -5)°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, first of all lower the value of the integration temperature (TAH), then change the Maximum Temperature (TM3).

ABC Temperature (Automatic Boiler Control) on probe S3Data Regulation range Default

TABC 20.0 .. 80.0°C 30.0 °C

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O AF P3: ANTIFROST PARAMETER MANAGEMENTThe data to manage the antifrost function can be set with the ‘O AF’ (Option Anti Frost) parameter.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.

WARNING!The control unit is supplied with preset antifrost data for optimal operation.Any change to these values must be performed by qualified personnel only.

In the following the regulation ranges allowed for each parameter are listed.

Antifrost temperature

Data Regulation range Default

TAF -10.0°C .. +5.0°C 4.0 °C

Collector pump ‘on’ time


P ON 5 .. 60 sec. 10 sec.

Collector pump ‘off’ time


P OF 1 .. 60 min. 20 min.

Antifrost test duration


TMR 5 .. 60 sec. 10 sec.

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ACT P5: RELAY LOGIC SELECTIONUsing 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).If the parameter is not activated in the selected scheme, the message ‘ NONE ‘ will appear on the display.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.In the following the regulation ranges allowed for each parameter are listed.

BEEP P4: ACOUSTIC SIGNAL MANAGEMENTUsing this parameter it is possible to enable or disable the acoustic signalling of the control unit (keyboard tones, alarms, and diagnostics).To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.In the following the regulation ranges allowed for each parameter are listed.

Enable (1) / Disable (0) acoustic signal


BEEP 0 .. 1 1

Note: ‘0’ disables it, while ‘1’ enables acoustic signalling. Output logic for OUT 2


OUT 2 0 .. 1 1

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C AH P6: INTEGRATION HOURS COUNTERThe number of hours the integration source is activated can be viewed and/or reset with the ‘C AH’ (Counter After Heating) parameter.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.To view the actual integration hours, proceed as follows:Having selected parameter P6 press the ‘ ‘ key.‘H’ is displayed as well as the actual activation hours of the integration source.Press the ‘esc’ key; the control unit returns to displaying the list of installer parameters.To reset the actual integration hours, proceed as follows:Having selected parameter P6 press the ‘ ‘ key.‘H’ is displayed as well as the actual activation hours of the integration source.Press the ‘ ‘ key - ‘H’ blinking is displayed.Press the ‘ ‘ key again; the control unit resets the counter.Press the ‘esc’ key; the control unit returns to displaying the list of installer parameters.

Note: 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.

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Output logic for OUT 3


OUT 3 0 .. 1 1

Note: ‘0’ means Normally Closed (N.C.) logic, while ‘1’ means Normally Open (N.O.) logic.

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By pressing the ‘esc’ key the control unit interrupts the test and returns to the normal working mode.

The regulation range is defined in the following:

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Test sequence setting


TMR 04 .. 20 04

TEST P7: LOADS WIRING TESTThe functional test of the control unit’s outputs can be run with this parameter, including the alarm relay output. This allows the installer to check if the connections are correct.The control unit activates all the outputs in order - OUT1, OUT2, OUT3 and ALARM – (activating the relative buzzer) in sequence for 10 seconds each depending on the layout configured.The number of activations for each output, in multiples of 4, can be set with the only datum in ‘TMR’.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’To run the connected loads test:

Having selected parameter P7 press the ‘ ‘ key.‘TMR’ is displayed as well as the number of previously set activations.Press the ‘ ‘ key - ‘TMR’ blinking is displayed.Set the number of output activations using the ‘ ‘ or ‘ ‘ arrow key.Press the ‘ ‘ key again; the control unit starts the test, activating all the outputs available for the layout selected. The hydraulic layout is displayed together with the word TEST and the ‘ ‘ symbol. The moment the alarm output is activated the control unit also displays the ‘ ‘ symbol and the buzzer is activated.

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Plant flow rate expressed in litres/minute


FLOW OFF .. 20.0 l/min. 2.3 l/min.

WARNING!The ‘FLOW’ datum is only active if the ‘FLT’ datum is set on ‘ --- ‘ (no flowmeter connected).

‘RESET’ and the quantity of energy produced are displayed Press the ‘ ‘ key – ‘RESET’ blinking is displayed.Press the ‘ ‘ key again; the control unit resets the counter.Press the ‘esc’ key; the control unit returns to displaying the list of installer parameters.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.In the following the regulation ranges allowed for each parameter are listed.

SEM P8: CALCULATION OF THE ENERGY PRODUCEDThe data relative to measuring the quantity of Heat Produced by the System can be managed with the ‘SEM’ (Solar Energy Meter) parameter.The calculation of the energy produced depends on the following parameters:- System flow rate (measured by a flowmeter connected to

the control unit or, if there is no flowmeter, by the flow set).

- Type of antifrost liquid used in the system.- Antifrost liquid concentration.- Temperature measured by the return probe (S5) or, if there

is no return probe, by the probe installed at the bottom of the boiler.

The quantity of energy produced is stored in the control unit memory approximately every 2 hours.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.To disable the energy produced counter, proceed as follows:

Set the ‘FLT’ data on ---.Set the ‘FLOW’ data on OFF.

To reset the energy produced counter, proceed as follows:Having selected the ‘RESET’ data, press the ‘ ‘ key.

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Litres/pulses setting


L/P 1 litres/puls., 10 litres/puls. 1 litres/puls.

WARNING!The ‘L/P’ datum is only active if the ‘FLT’ datum is set on ‘rEEd’ (reed relay flowmeter).

Type of antifrost liquid used in the system


AFT H2O, PrOP, EtH, tYF H2O

WARNING!H2O: WaterPrOP: Propylene GlycolEtH: Ethylene GlycoltYF: Tycofor LS/GLS

Type of flowmeter connected to the control unit


FLT ---, PULS, rEEd PULS

WARNING!---: no flowmeter connected.PULS: a digital flowmeter has been connected (pulse

type).rEEd: a reed relay flowmeter has been connected

(counter).Choosing ‘PULS’ or ‘rEEd’ the control unit disables the ‘FLOW’ datum.

Piping diameter


DN 15, 20, 25 20

WARNING!The ‘ND’ datum is only active if the ‘FLT’ datum is set on ‘PULSE’ (digital flowmeter).DN15 = 1/2” - DN20 = 3/4” - DN25 = 1”

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REF P9: RECOOLING FUNCTIONThe ‘REF’ function (Recooling Function) consists of the automatic decrease of boiler temperature.This parameter permits to set the data concerning the management of the automatic cooling function of the boiler.The icons of ‘pump’ and ‘sun’ flashing on the display will indicate that the collector pump cooling the boiler has been activated.The Recooling function will be activated if the RCEN parameter is 1, whereas it will be deactivated if the parameter is 0.If the parameter is not activated in the selected scheme, the message ‘ NONE ‘ will appear on the display.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.In the following the regulation ranges allowed for each parameter are listed.

Recooling TemperatureData Regulation range DefaultTR 70°C .. (TM3+5)°C 70°C

Antifrost liquid concentration


%AF 20 % .. 70 % 45%

WARNING!The ‘%AF’ datum is only active if the ‘AFT’ datum is set on ‘PrOP’ or ‘EtH’.It is possible to choose the concentration of the antifrost in the adjustment field indicated, in 5% multiples.

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Activation / Deactivation of the Recooling function


RECEN 0 .. 1 1

Nota: ‘ 0 ‘ indicates the Recooling function is deactivated, whereas ‘ 1 ‘ indicates it is activated.

WARNINGIt is not possible to set the value of the Recooling Temperature (TR) at a value which is equal or lower than the value of the highest Maximum Temperature. The value of the Recooling Temperature (TR) is linked to the value of the highest Maximum Temperature +1°C.In order to lower the Recooling Temperature (TR) below the value of the maximum Temperatures already set, first of all lower the value of the maximum Temperature(s), then change the Recooling Temperature (TR). Should any Maximum Temperature be increased to a value which is higher than the value of the Recooling Temperature (TR), this is automatically set at the value of the highest maximum temperature +1°C.The same shall be considered as regards the Recooling Temperature (TR) with reference to the integration temperature (TAH).

Recooling Temperature (TR) Differential


∆TR 6°C .. 15°C 8°C

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UNIT P11: MEASUREMENT UNITThis parameter permits to select the measurement unit required, in °C or °F.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.

Measurement unit


UNIT °C .. °F °C

WARNINGChanging the measurement unit from °C to °F, or vice versa, will entail the reset of the “default” data, that is the loss of all the personal data included and stored in the power unit, such as thermal parameters, hydraulic scheme, counters, password, and any other data stored in the internal storage of the power unit itself.The default data reset could be exploited, for example, if the installer wanted to set the factory data again without however changing every single parameter.If the measurement unit is changed, the power unit will be reset in scheme no.1 and the message ‘RST data’ will appear on the display for approx. 6 seconds to indicate that all data have been reset to the default values.

PVK P10: PERIODIC ACTIVATION OF LOADSWith the ‘ PVK ‘ parameter (Pump and Valve Kick) it is possible to manage the periodic activation of loads (pumps and valves) included in the hydraulic scheme selected. In particular, if a load has not been activated in 21 hours’ time, it will be automatically activated by the power unit for 15 seconds, according to the operation logic.If a load is activated during this time gap, the counting will start again from zero.The timers counting the waiting and activation time will not be stored, and counting will start again from zero in case of reset or voltage lack.The ‘periodic activation of loads’ function will be activated if the PVK parameter is 1, whereas it will be deactivated if the parameter is 0To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.

Periodic activation of loads


PVK 0 .. 1 1

Note: ‘ 0 ‘ indicates that the periodic activation of loads is deactivated, whereas ‘ 1 ‘ indicates it is activated.

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Minimum speed OUT 1 in %


%MN1 30% .. 100% 30%

WARNING!The power unit is delivered already set for an optimal operation.The preset data can only be changed by qualified staff.

Minimum speed OUT 2 in %


%MN2 30% .. 100% 30%

Increase 10%


INC 1.0°C .. 20.0°C 2.0°C

%FS P12: SETTING OF COLLECTOR PUMP SPEEDWith the ‘%FS’ parameter (Fast Speed%) it is possible to set the data that will control the speed of the collector pumps connected to outputs OUT1 and OUT2.

The working principle which regulates solar collector pump speed variation is very much linked to the need to keep the difference in temperature between the solar collector and the boiler as constant as possible (T).Since it is a well-known fact that as incidental solar radiation increases, the T also tends to increase, one way of decreasing the T whilst maintaining incidental solar radiation constant is to reduce the amount of time that the fluid transits within the collector, or rather to increase fluid transit speed, by increasing the number of solar collector pump rotational speed.Using the P12 parameter it is possible to set both the minimum work speed of the solar collector pump as a percentage and the variation in temperature required to increase solar collector pump speed by 10% in relation to the T (INC parameter).To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.In the following the regulation ranges allowed for each parameter are listed.

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Enabling/disabling the collectorminimum temperature


MTEN 0 .. 1 0

Note: with ‘ 0 ‘ the limitation of minimum temperature on collector is disabled, while with ‘ 1 ‘ it is enabled.

MTL P13:MINIMUM TEMPERATURE LIMITATIONThe parameter ‘MTL’ (Minimum Temperature Limit) 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 Manual operation mode, in ABC operation or in case the pumps activation is caused by the intervention of Recooling or similar functions.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.In the following the regulation ranges allowed for each parameter are listed.

Adjustment of collector minimum temperature


MTC 10.0°C .. 90.0°C 10.0 °C

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If the solar control unit measures a collector temperature that is 2°C lower compared to the latest collector temperature stored it will be stored as the new reference temperature.If the solar control unit measures a collector temperature that is 2°C higher compared to the latest collector temperature stored, the collector pump works at 100% for 30 seconds to determine the current average temperature. At the end of these 30 seconds the average collector temperature measured is stored and it will be the new reference value if the collector pump is OFF.If the collector pump stays OFF, the control unit repeats the steps described up to this point.On the contrary, if the collector pump is activated (ON), the control unit repeats the steps described in ‘Tubular collector function with collector pump ON’.

To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.Below is a list of the adjustment fields for each single datum.

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TCF P14: TUBULAR COLLECTOR FUNCTIONThe ‘TCF’ function (Tubular Collector Function) is to be activated only if tubular solar collectors are being used (also known as vacuum tubes).This function is linked to the need to have a uniform temperature on the collector.Working principle:Function of a tubular collector with collector pump ON:

The control unit measures the temperature of the collector which is used as the reference value if the collector pump is OFF.If the solar control unit measures a collector temperature that is 2°C higher compared to the latest collector temperature stored, the collector pump is forced to work 100% for 30 seconds to determine the current average temperature. At the end of these 30 seconds the average collector temperature measured is stored and it will be the new reference value if the collector pump is OFF.If the collector pump stays ON the control unit continues updating the average temperature as explained.

Function of a tubular collector with collector pump OFF:

The control unit measures the temperature of the collector which is used as the reference value if the collector pump is ON.

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RCC P15:COLLECTOR PUMPS ACTIVATION TIME RESETTo access the change mode of the ‘RCC’ parameter (Reset Collector Counter), follow the procedure given in ‘using the installer parameters’.To reset the actual collector pump activation hours, proceed as follows:

Having selected parameter P15 press the ‘ ‘ key.The following can be displayed:CC RESET: indicating that the counter can be reset.CC 0000: indicating that the counter has been reset.Press the ‘ ‘ key - ‘CC’ blinking is displayed.Press the ‘ ‘ key again; the control unit resets the counter.Press the ‘esc’ key; the control unit returns to displaying the list of installer parameters.

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WARNING!With the reset command the counters of the first collector pump and of the second collector pump are both reset simultaneously, East/West layouts, regardless of the layout selected.The hours of functioning are stored approximately every 12 hours.

WARNING!With the first activation or, for instance, after a control unit reset, if the TCF function is enabled the collector pumps could start working at 100% for 30 seconds to bring the system temperatures into line. In addition, the TCF function is limited by the set safety temperatures.

Enabling/Disabling the Tubular Collector Function function


TCF 0 .. 1 0

Note: ‘ 0 ‘ indicates the function is deactivated, whereas ‘ 1 ‘ indicates it is activated.

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Enabling/Disabling the anti-Legionella function


ALF 0 .. 1 0


To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.In the following the regulation ranges allowed for each parameter are listed.

ALF P16: ANTI-LEGIONELLA FUNCTIONThe ‘ALF’ function (Anti-Legionella Function), controls activation of the integrative source to bring boiler water up to 65°C for 30 minutes each day to destroy all legionella bacteria.The integrative source is activated only if the solar control unit has never measured a temperature of 65°C on the boiler probe for at least 30 minutes throughout the day.If it is necessary to use the integrative source, this will take place from 2300h to 2400h.

WARNING!For the proper disinfection of the water and destroy the Legionella bacterium the VIOLERA’ function with limits imposed, if any, by means of the Maximum and Safety Temperatures.In fact, the temperature in the Boiler will be raised until it reaches 65.0°C plus any hysteresis equal to 2.0°C for at least 30 minutes.Hence activation of the function means a consumption of energy even though it is not required by normal system operation, supplied by the integrative source.Disinfection is done correctly if the integrative source is able to heat the Boiler water to the temperature required in less than 1 hour.

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WARNINGTmWT is the time during which the solar control unit monitors and compares the difference in temperature between the collector and the priority boiler with the differential set in the installer parameter P2 (∆T12).At the end of this time the function decides whether or not to stop filling the priority boiler and start filling the other boilers.

Setting maximum filling-up time


TmMF 1 min. .. 30 min. 15 min.

WARNINGTmMF is the maximum time for filling the secondary boilers when filling-up is due to the ‘AEB’ function.

AEB P17: ‘BOILER’ PRIORITY FUNCTIONThe ‘AEB’ function (Auto Exchange Boiler) automatically controls filling of all the boilers in the system if there is little heat coming from the collector. This function is used if a system with more than one boiler is used.To access the change mode of this parameter, follow the procedure given in ‘using the installer parameters’.In the following the regulation ranges allowed for each parameter are listed.

Boiler Priority function Enabling/Disabling


AEEN 0 .. 1 0


Setting waiting time


TmWT 1 min. .. 30 min. 4 min.

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FUNCTIONS ACCESSIBLE TO THE USERThe functions accessible to the user are limited and do not allow setting those data influencing the installation management. The only operations allowed to the user are the following:

Control unit Switching On/Switching OffManual control of the collector pumpsUser parameter management:Displaying/Resetting maximum temperaturesAntifrost function Enabling/DisablingABC function Enabling/DisablingAdjusting the clockSetting the timed thermostat

Turning on / Turning off the control unitTo turn the control unit on and off, press the ‘ esc ’ key for at least 3 seconds.Manual control of the collector pumpsManual operation of the collector pumps can be activated or deactivated by pressing the ‘’ key.When manual function is chosen the display shows the icon ‘ ‘. In manual operation the collector pump is always active, regardless of the measured temperatures and the integrative heat source is always disabled.The only active controls are those related to the maximum temperatures and safety.

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Using the user parametersTo facilitate programming simply remember the following rule:The ‘ ‘ key: is used to access the change mode of

the parameter selected and relative data to vary. It is also used to confirm the change made.

The ‘esc’ key: is used to cancel the changes just made, but only if it has not been already confirmed with the ‘ ‘ key; also used to exit the installer parameters.

The ‘‘ or ‘‘ keys: used to scroll the various parameters and to change the data of each one.

WARNING!In the ‘ USER PARAMETERS ‘ mode all the outputs aredisabled.All default values are to be considered as indicative, being they subject to changes due to the version and without prior notice.

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PRESS THE ‘ ‘ KEY TO ACCESS‘ USER PARAMETERS ‘.

USING THE ‘ ‘ or ‘ ‘ ARROWS IT IS POSSIBLE TOSCROLL CYCLICLALLY THROUGH THE USER PARAMETERS.

PRESS THE ‘ ‘ KEY TO SELECT THEDESIRED PARAMETER.

THE FIRST ‘ USER PARAMETER ’ IS SHOWN.

WAIT 20 SECONDS OR PRESS THE ‘ esc ’ KEY TO QUIT THE USER MODE.

TO CONFIRM THE CHANGE MADE, PRESS THE ‘ ‘ KEY (the control unit stores the choice made), OTHERWISE, TO

CANCEL THE CHANGE MADE PRESS THE ‘ esc ‘ KEY ‘.

IN THE CASE OF A PARAMETER WITH OTHER DATA TO CONFIGURE, SELECT THE DATA WITH THE ‘ ‘ or ‘ ‘ ARROW KEY AND PRESS THE ‘ ‘ KEY TO ACCESS

THE CHANGE MODE OF THE DATA SELECTED.

WITH THE ‘ ‘ or ‘ ‘ ARROW KEY, CONFIGURE THE DATA OF EACH SINGLE PARAMETER.

THE CONTROL UNIT RETURNS TO DISPLAYING THE LIST OF INSTALLER PARAMETERS OR THE LIST OF DATA TO

CONFIGURE.

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USER PARAMETERSAfter having pressed the ‘ ‘ key you access the user parameter change mode (‘SET’ icon on).List of parameters the user can configure

PARAMETER DESCRIPTION DATA TO SET

‘ TMAX U1‘Display and/or cancel the maximum temperatures recorded.

TM1: Maximum temperature measured by probe S1TM2: Maximum temperature measured by probe S2TM3: Maximum temperature measured by probe S3TM4: Maximum temperature measured by probe S4

‘ AFR U2 ‘ Enables/disables the antifrost function. AFR: Enables/disables the antifrost function.

‘ ABC U3 ‘Enables/disables the ABC function(Automatic Boiler Control).

AFR: Enables/disables the ABC function.

‘ CLK U4 ‘ Allows adjustment of the solar control unit clock.HH: Sets the hours.MM: Sets the minutes.

‘ CHR U5 ‘Setting the daily time bands for controlling integration output activation (timed thermostat function).

CHEN: Enabling/disabling the number of time bandsST1: Time to start the first time band (START 1)SP1: Ending time of the first time band (STOP 1)ST2: Starting time of the second time band (START 2)SP2: Ending time of the second time band (STOP 2)ST3: Starting time of the third time band (START 3)SP3: Ending time of the third time band (STOP 3)

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TMAX U1:DISPLAYING THE MAXIMUM TEMPERATURES RECORDEDWith the ‘TMAX U1’ parameter the maximum temperatures recorded in the system by each probe can be displayed and/or cancelled.To access the change mode of this parameter follow the procedure given in ‘using the user parameters’.

To see the maximum temperatures that have actually been measured by the solar control unit, proceed as follows:

Having selected parameter ‘TMAX U1’ press the ‘ ‘ key.The first maximum temperature recorded is displayed (TM1).With the ‘ ‘ and ‘ ‘ arrow keys it is possible to cyclically scroll through the maximum temperatures recorded (TM1-TM2-TM3-TM4).Press the ‘esc’ key; the control unit returns to displaying the list of user parameters.

To reset the maximum temperatures that have actually been measured by the solar control unit, proceed as follows:

Having selected parameter ‘TMAX U1’ press the ‘ ‘ key.

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The first maximum temperature recorded is displayed (TM1).With the ‘ ‘ and ‘ ‘ arrow keys it is possible to cyclically scroll through the maximum temperatures recorded (TM1-TM2-TM3-TM4).Select the temperature you want to reset the stored value of.Press the ‘ ‘ key; the control unit displays the number of the probe (blinking).Press the ‘ ‘ key again; the control unit resets the counter.Press the ‘esc’ key; the control unit returns to displaying the list of user parameters.

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AFR U2: ANTIFROST ACTIVATIONThe ‘ AFR U2 ’ parameter (anti-frost) enables or disables the antifrost function. The management of the antifrost data is performed through the user parameters.To access the change mode of this parameter follow the procedure given in ‘using the user parameters’.Below is a list of the adjustment fields for each single datum:

Enable/Disable the antifrost


AFR 0 .. 1 0


When this function is active the display will show the symbol ‘ ‘.

ABC U3:AUTOMATIC BOILER CONTROL BY MEANS OF COLLECTORS (ABC)The function ‘ ABC U3 ’ is an interesting addition to the Manual mode. When the function ‘ ABC ’ is enabled, the collector pump, in contrast to the Manual mode, in which it is always running, is stopped if the collector temperature, measured by the probe S1, drops below the temperature set in the ‘ TABC ’ parameter in the installer parameters.To access the change mode of this parameter follow the procedure given in ‘using the user parameters’.The regulation range is defined in the following:

Enable/Disable the ABC function


ABC 0 .. 1 0


When this function is active the display will show the symbol ‘ ‘.

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CLK U4: ADJUSTING THE TIMEThe solar control unit clock can be adjusted with the ‘CLK U4’ (clock) parameter.

WARNING!When the control unit is switched on for the first time the time is set at random so you will need to put it right.In the case of a power cut, the clock will continue to work correctly.

To access the change mode of this parameter follow the procedure given in ‘using the user parameters’.Below is a list of the adjustment fields for each single datum:

Setting the current hour


HH 00 .. 24

Setting the current minutes


MM 00 min. .. 59 min.

CHR U5: CHRONOSTAT SETTINGWith the ‘ CHR ’ parameter (timed thermostat) the daily time bands can be set to control activation of the integration output.This function is used if a system with one integrative source is used.If this function is enabled the integrative source may only be activated during the time bands set; it is excluded outside the time bands.Up to 3 switch-on time bands can be set with this parameter or the function can be disabled.Each time band is characterised by a band start time (ST = START) and a band end time (SP = STOP); the adjustment interval is in 30 minute steps.To access the change mode of this parameter follow the procedure given in ‘using the user parameters’.Below is a list of the adjustment fields for each single datum:

Chronostat Enabling/Disabling


CHEN 0 .. 3 0

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Starting time of the first time band


ST1 00 .. 24 06:00

Ending time of the first time band


SP1 00 .. 24 08:00

WARNING!Setting of the time bands is limited by the following rules:Increasing ST1:if ST1 = SP1 the control unit automatically increases SP1 by 30 minutesDecreasing SP1:if SP1 = ST1 the control unit automatically decreases ST1 by 30 minutes

Starting time of the second time band


ST2 00 .. 24 11:00

Ending time of the second time band


SP2 00 .. 24 13:00

Starting time of the third time band


ST3 00 .. 24 17:00

Ending time of the third time band


SP3 00 .. 24 23:00

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The programming mode for the timed thermostat function is given below:

Data Regulation range Other data to set

CHEN

0 Chronostat function disabled

1 It is possible to set a time bandST1 (START 1): Starting time of the time bandSP1 (STOP 1): Ending time of the time band

2 It is possible to set two time bands

ST1 (START 1): Starting time of the first time bandSP1 (STOP 1): Ending time of the first time bandST2 (START 1): Starting time of the second time bandSP2 (STOP 2): Ending time of the second time band

3 It is possible to set three time bands

ST1 (START 1): Starting time of the first time bandSP1 (STOP 1): Ending time of the first time bandST2 (START 2): Starting time of the second time bandSP2 (STOP 2): Ending time of the second time band ST3 (START 3): Starting time of the third time bandSP3 (STOP 3): Ending time of the third time band

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TROUBLESHOOTING

ANOMALY POSSIBLE CAUSE

During normal operation the control unit displays the symbol and emits an acoustic signal characterized by a series of ‘beeps’.The probe originating the problem is flashing on the display.

The control unit has revealed an anomaly on the probe.The display shows the number of the damaged probe and the type of anomaly present.

The icon blinks on the display and the control unit sounds a series of beeps.

One or more probes are measuring a temperature higher than the relevant programmed safety temperature.

In the selection of the installation to be realized (installer parameter P1) one or more probes flashing.

The probe is miswired or damaged.

Short circuit on probeinput (R≈0).

COL ShrTS_2 ShrTS_3 ShrTS_4 ShrT

Open circuit on probe input (R=∞).

COL OPEnS_2 OPEnS_3 OPEnS_4 OPEn

WARRANTYIn the view of a constant development of their products, the manufacturer reserves the right for changing technical data and features without prior notice. The consumer is guaranteed against any lack of conformity according to the European Directive 1999/44/EC as well as to the manufacturer’s document about the warranty policy. The full text of warranty is available on request from the seller.

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@IST01450EAN 019657A0 010811

digital control unit for thermal solar …...digital control unit for thermal solar systems with...

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