Thermo Solar SR24 Installation And Operating Instructions Manual

Temperature difference controller

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Temperature Difference Controller SR24

Installation and operating instructions

Read carefully before installation, commissioning and operation

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Page 1 Temperature Difference Controller SR24 Installation and operating instructions Read carefully before installation, commissioning and operation...
Page 2: Table Of Contents
Content 5.14. - Thermostat periods EC declaration of conformity 5.15. - „Party Function“ General instructions 5.16. - Energy saving mode Explanation of symbols 5.17. - TecoS3 Changes to the unit Warranty and liability 6. - Protective functions 6.1. - Seizing protection 6.2.
Page 3 This manual applies to the following hardware versions: Version 1 Version 2 2 mechanical relays on/off 1 mechanical relays on/off 1 electronic relay Version 3 Version 4 2 mechanical relays on/off 1 mechanical relay on/off 1 PWM / 0-10V for high efﬁ cency pumps 1 electronic relay for speed control of standard pumps 1 PWM / 0-10V for high efﬁ...
Page 4: Ec Declaration Of Conformity
Safety instructions EC declaration of conformity By afﬁ xing the CE mark to the unit the manufacturer declares that the Temperature- Difference-Controller SR24, conforms to the following relevant safety regulations: EC low voltage directive 2006/95/EC EC electromagnetic compatibility directive 2004/108/EC Conformity has been veriﬁ...
Page 5: Changes To The Unit
Safety instructions Changes to the unit Changes to the unit can compromise the safety and function of the unit or the entire system. Danger Changes, additions to or conversion of the unit are not permitted without the writ- ten permission from the manufacturer It is likewise forbidden to install additional components that have not been tested together with the unit If it becomes clear that safe operation of the unit is no longer possible, for exam-...
Page 6: Specifi Cations
Description of controller Speciﬁ cations Electrical speciﬁ cations: Mains voltage 115 VAC +/- 10% Mains frequency 50 - 60Hz Power consumption 1,5W - 2,3W Internal fuse T2A / 250V slow blow Protection category IP40 Protection class Overvoltage Category Degree of Pollution Category Vers.1 Vers.2 Vers.3...
Page 7: About The Controller
The controller menu contains headwords for the measured values and settings, as well as help texts or clearly-structured graphics. The SR24 can be used as a temperature difference controller for the various system variants illustrated and explained under B.5. Important characteristics of the SR24:...
Page 8: Hydraulic Variants
Description of controller Hydraulic variants The following illustrations should be viewed only as schematic diagrams showing the respective hydraulic systems, and do not claim to be complete. The controller does not replace safety devices under any circumstances. Depending on the speciﬁ...
Page 9: Wall Installation
Installation Wall installation Install the controller only in dry areas and under the ambient conditions de- scribed under B.1 “Speciﬁ cations”. Carry out the following steps 1-8. Caution 1. Unscrew cover screw completely C.1.1 2. Carefully pull upper part of housing from lower part.
Page 10: Electrical Connection
Installation Electrical connection Before working on the unit, switch off the power supply and secure it against being switched on again! Check for the absence of power! Electrical connections may only be made by a specialist and in compli- Danger ance with the applicable regulations.
Page 11: Installing The Temperature Sensors
Installation 1.Select necessary program/hydraulics C.2.1 (Fig. B5 resp. D.1 - D.20) 2.Open controller as described under C.1. 3.Strip cables by 55mmmax., insert, ﬁ t the strain relief devices, strip the last 8-9mm of the wires (Fig. C.2.1) 4.Open the terminals using a suitable screwdriver (Fig.
Page 12: Terminal Connection Diagram
Sensor 2 Neutral conductor N S3 (2x) Sensor 3 Relay 2 Neutral conductor N SR24 V3 + V4: Mains phase conductor L speed controlled Mains neutral conductor N output for High efﬁ ciency pumps speed controlled The PE protective conductor must be con- output for High efﬁ...
Page 13 S2 (2x) Sensor 2 storage tank S3 (2x) Sensor 3 (optional) The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 14 S2 (2x) Fühler 2 storage tank S3 (2x) Fühler 3 (optional) The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 15 S2 (2x) Sensor 2 backward ﬂ ow S3 (2x) Sensor 3 (optional) The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compart- ment!
Page 16 S2 (2x) Sensor 2 reference S3 (2x) Sensor 3 (optional) The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compart- ment!
Page 17 S2 (2x) Sensor 2 swimming pool S3 (2x) Sensor 3 heat exchanger The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 18 S3 (2x) Sensor 3 storage tank top The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 19 S3 (2x) Sensor 3 forward ﬂ ow The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 20 S2 (2x) Sensor 2 storage tank S3 (2x) Sensor 3 collector 2 The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 21 S3 (2x) Sensor 3 storage tank 2 The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 22 S3 (2x) Sensor 3 storage tank 2 The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 23 S3 (2x) Sensor 3 storage tank top The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 24 S2 (2x) Sensor 2 storage tank S3 (2x) Sensor 3 (optional) The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 25 S3 (2x) Sensor 3 storage tank top The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Terminal: Connection for:...
Page 26 S3 (2x) Sensor 3 (reference) The polarity of the sensors is freely selectable. V1 / - 0-10V or PWM +/- ( SR24 Version 3+4) Mains voltages 115 VAC 50-60Hz Connection in the right-hand terminal compartment! Brief description of switching function: Terminal: Connection for: The ΔT function sensor 1 >...
Page 27: Display And Input
Operation Display and input The display (1), with its extensive text and graphics mode, is almost self-explanatory, allowing easy operation of the controller. The LED (2) lights up green when a relay is switched on. The LED (2) lights up red when operating mode “Off”...
Page 28: Commissioning Help
Parametrisation Commissioning help The ﬁ rst time the controller is turned on and after the language and time are set, a query appears as to whether you want to parametrise the controller using the commissioning help or not. The commis- sioning help can also be terminated or called up again at any time in the special functions menu.
Page 29: Menu Sequence And Menu Structure
Operation Menu sequence and menu structure The graphics or overview mode appears when no key has been press for 2 min- utes, or when the main menu is exited by pressing “esc“. Pressing a key in graphics or overview mode takes you directly to the main menu. The following menu items are then avail- able for selection there: Current temperature values with explana-...
Page 30: Measurement Values
Measurement values 1. - Measurement values The menu “1. Measurement values” serves to display the currently measured temperatures. The menu is closed by pressing “esc” or selecting “Exit measurement values”. Selecting “Info” leads to a brief help text explaining the measurement values. Selecting “Overview”...
Page 31: Statistics
Statistics 2. - Statistics The menu “2. Statistics” is used for func- tion control and long-term monitoring of the system. The menu is closed by pressing “esc” or selecting “Exit statistics”. For analysis of the system data it is essential for the time to be set ac- curately on the controller.
Page 32: Display Mode
Display mode 3. - Display mode Menu “3. Display mode” is used to deﬁ ne the controller’s display for normal opera- tion. This display appears whenever two min- utes go by without any key being pressed. The main menu appears again when a key is pressed.
Page 33: Operating Modes
Operating modes 4. - Operating modes In menu “4. Operating modes” the con- troller can either be placed in automatic mode, switched off, or placed in a manual operating mode. The menu is closed by pressing “esc” or selecting “Exit operating modes”. 4.1.
Page 34: Settings
Settings 5. - Settings The necessary basic settings required for the control function are made in menu “5. Settings”. This does not under any circumstances replace the safety facilities to be provided by the customer! Caution The menu is closed by pressing “esc” or select- ing “Exit settings”.
Page 35: Tmax S2
Settings 5.4. - Tmax S2 Switch-off temperature at sensor 2 If this value is exceeded at sensor 2 and the other conditions are also met, then the controller switches the associated pump and/or valve off. If sensor 2 falls below this value again and the other conditions are also met, then the controller switches the pump and/or valve on again.
Page 36: T R2
Settings 5.7. - ∆T R2 Switch-on/Switch-off temperature difference for relay R2 If this temperature difference between the reference sensors is exceeded and the other conditions are also met, then the controller switches the pump and/or the valve When the temperature drops to ΔT Off, then R2 is switched off. Settings range: ΔT from 4°C to 20°C / ΔTOff from 2°C to 19°C Settings range: ΔT 10°C / ΔT off 3°C.
Page 37: Priority Sensor
Settings 5.10. - Priority sensor Charging priority in systems with two storage tanks A setting must be made as to which storage tank (storage tank sensor) has priority for charging. Charging of the lower-priority storage tank is interrupted at regular intervals to check whether the temperature increase at the collector can enable charging of the higher-priority storage tank.
Page 38: Party Function
Settings 5.15. - „Party Function“ With the party function the storage temperature is heated up once to the reference temperature (TrefS3+hysteresis, respectively TecoS3+hysteresis in energy saving mode). The party mode is activated by pressing the „esc“-key for 3 seconds in the main menu.
Page 39: Protective Functions
Protective functions 6. - Protective functions Menu “6. Protective functions” can be used to activate and set various protective functions. This does not under any circumstances replace the safety facilities to be provided by the customer! Caution The menu is closed by pressing “esc” or select- ing “Exit settings”.
Page 40: System Protection
Protective functions Protective functions 6.3. - System protection priority protection System protection prevents overheating of system components by automatic shutdown of the solar pump. If “SProt Ton” is exceeded at the collector, the pump is switched off. The pump is activated again when the temperature drops below “SProt TOff”. Automatic shutdown - settings range: On / Off / Default: on SProt Ton - settings range: 60 °C to 150 °C / Default: 120 °C SProt Toff - settings range: 50 °C to Ton minus 5 °C / Default: 115 °C...
Page 41: Cooling Functions
Protective functions 6.4.1. - Cooling functions The hydraulic variants are set in menu „7.1 Program selection“ Hydraulic Variant D.14 Solar + cooling 1: If „CProt Ton“ is exceeded at S1, the cooler at R2 is switched on till the temperature drops to „CProt Toff“.
Page 42: Anti-Legionella
Protective functions 6.7. - Anti-Legionella With the “AL function” activated the SR24 makes it possible to heat the storage tank to a higher temperature (“AL Tsetpoint S2”, provided that the energy source allows this. Time periods when the AL heat up is attempted are to be setup in the menu “AL times”...
Page 43: Special Functions
Special functions 7. - Special functions Menu “7. Special functions” is used to set basic items and expanded functions. Other than the time all settings may only be made by a specialist. Caution The menu is closed by pressing “esc” or select- ing “Exit special functions”.
Page 44: Output Signal
Special functions 7.2.1.2. - Output Signal This menu determines the type of pump used: Solar pumps perform at their highest power when the signal is also maxed, heating pump on the other hand are set to high- est power wenn the control signal is at the lowest. Solar = normal, heating = Inverted. Settings range: Normal, Inverted / Default setting: Normal 7.2.1.3.
Page 45: Speed When „On
Special functions 7.2.1.6. - Speed when „On“ This menu determines the calculated and displayed speed of the pump. If e.g. 30% is set here and the signal set in „PWM on/0-10V on“ is put out, 30% speed is displayed. When the signal set in „PWM max/0-10V max“ is put out, 100% speed is displayed. Everything in between is calculated accordingly.
Page 46: Purging Time
Special functions 7.3.2. - Purging time During this time period, the pump is running with full speed (100%) to ensure trouble- free startup. After this time has passed, the pump is set to speed control and is set to max. speed or min speed, depending on the speed control variant „7.2.1. - Modes“ auf Seite 45 chosen.
Page 47: Time & Date
Special functions 7.4. - Time & date This menu is used to set the current time and date. For analysis of the system data it is essential for the time to be set accurately on the controller. Please note that the clock continues to run for 24 hours if the mains voltage is interrupted, and should be reset afterwards.
Page 48: Heat Quantity
Special functions 7.8. - Heat quantity A simple heat metering function for basic system control can be activated in this menu. Additional settings regarding the glycol, the percentage of gylcol and the ﬂ ow rate of the system are required. Resulting data is only approximate value for function control! Caution 7.8.1.
Page 49: Start Aid Function
Special functions 7.9. - Start aid function With some solar systems, especially with vacuum tube collectors, it may occur that the measurement value acquisition at the collector sensor occurs too slowly or too inac- curately because the sensor is often not at the hottest location. When the start help is activated the following sequence is carried out: If the temperature at the collector sensor increases by the value speciﬁ...
Page 50: Menu Lock
Menu lock 8. - Menu lock Menu “8. Menu lock” can be used to secure the controller against unintentional changing of the set values. The menu is closed by pressing “esc” or select- ing “Exit menu lock”. The menus listed below remain completely accessible despite the menu lock being activated, and can be used to make adjustments if necessary: Measurement values Analysis...
Page 51: Service Values
Service values 9. - Service values The menu “9. Service values” can be used for remote diagnosis by a specialist or the manu- facturer in the event of an error, etc. Enter the values at the time when the error occurs e.g. in the table. Caution The menu can be closed at any time by press- ing “esc”.
Page 52: Language
Language 10. - Language Menu “10. Language” can be used to se- lect the language for the menu guidance. This is queried automatically during initial commissioning. The choice of languages may differ, however, depending on the device design. Language selection is not available in every device design!
Page 53: Malfunctions With Error Messages
Malfunctions Z.1. Malfunctions with error messages If the controller detects a malfunction, the red light ﬂ ashes and the warning symbol also appears in the display. If the error (LED ﬂ ashes + is no longer present, the warning symbol warning symbol) changes to an info symbol and the red light no longer ﬂ...
Page 54: Replacing The Fuse
Malfunctions Replacing the fuse Repairs and maintenance may only be performed by a specialist. Before working on the unit, switch off the power supply and secure it against Danger being switched on again! Check for the absence of power! Only use the supplied spare fuse or a fuse of the same design with the following speciﬁ...
Page 55 Tips & Tricks Instead of setting the ﬂ ow rate for the system using a ﬂ ow rate limiter, it is better to adjust the ﬂ ow rate using the switch on the pump and by means of the “max. speed” setting on the controller (see 7.9.4).
Page 56 Hydraulic variant set: Commissioned on: Commissioned by: Final declaration: Although these instructions have been created with the greatest possi- ble care, the possibility of incorrect or incomplete information cannot be excluded. Subject as a basic principle to errors and technical changes.