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Summary of Contents for Viessmann SCU124
- Page 1 SCU124 Mounting Connection Application examples Operation Troubleshooting en-US/CA Manual Thank you for buying this product. Read this manual carefully to get the best perfomance from this unit. Please keep this manual carefully. 5443202 v1.0 02/2010...
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Page 2: Table Of Contents
SCU124 Contents General ..............2 2.1 Push buttons................14 Overview ..............3 2.2 System monitoring display ..........14 1. Installation ............4 2.3 Flashing codes ..............15 1.1 Mounting ................4 3. Commissioning ..........16 1.2 Electrical connection ............4 4. Channel overview ..........18 1.3 Data communication/ Bus ..........5... -
Page 3: Overview
• Control of the system by ServiceCenter software possible • User-friendly operation • Housing with outstanding design • Extra-low power consumption 2.6" Included with the SCU124: 66 mm 1 × SCU124 1 × accessory bag 1 × spare fuse T4A 2 × screws and wall plugs 4 ×... -
Page 4: Installation
SCU124 1. Installation WARNING! Electric shock! 1.1 Mounting Opening the housing will expose display live parts! Î Switch off power supply and discon- nect the device from power supply before opening the housing! The unit must only be installed push button •... -
Page 5: Data Communication/ Bus
SCU124 Connecting the device to the power supply must always be the last step of the installation! The power supply to the controller must be carried out via an external power switch (last step!). The supply voltage must be 100 ... 240 V~ (50 ... 60 Hz). Flexible cables must be attached to the housing with the enclosed strain relief and the corresponding screws. -
Page 6: Terminal Allocation In The Different System Layouts
(OBST). switch-off temperature difference (DT F) or the maximum Note: tank temperature (S MX) is reached. Viessmann Vitosol collectors cannot be used in Sensors S3 and S4 can optionally be connected for mea- drainback systems. surement purposes. Arr 1... - Page 7 SCU124 Adjustment Channels Channel Description Factory setting Page System DT O Switch-on temperature difference 12.0 °Ra [6.0 K] DT F Switch-off temperature difference 8.0 °Ra [4.0 K] DT S Nominal temperature difference 20.0 °Ra [10.0 K] Rise control R1 4 °Ra [2 K]...
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Page 8: System Layout 2
SCU124 System layout 2 The controller calculates the temperature difference bet- rates relay 2 for backup heating or heat dump purposes, ween collector sensor S1 and tank sensor S2. If the diffe- when the adjusted thermostat switch-on temperature rence is larger than or identical to the adjusted switch-on (AH O) is reached. - Page 9 SCU124 Adjustment Channels Channel Description Factory setting Page System DT O Switch-on temperature difference 12.0 °Ra [6.0 K] DT F Switch-off temperature difference 8.0 °Ra [4.0 K] DT S Nominal temperature difference 20.0 °Ra [10.0 K] Rise control R1 4 °Ra [2 K]...
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Page 10: System-Specific Functions
SCU124 The following functions are exclusively available in system System-specific functions layout 2. The corresponding channels will not be available in any other system layout. Thermostat function The thermostat function works independently from the Backup heating solar operation and can be used for using surplus energy or for backup heating. - Page 11 SCU124 Option: Thermal disinfection of the upper DHW zone (OTD) OTD: This function is used for protecting the upper tank zone Thermal disinfection function against Legionella by activating the backup heating. Adjustment range: ON / OFF Reference sensor for the thermal disinfection is S3! Factory setting: OFF Î...
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Page 12: System Layout 3
SCU124 System layout 3 The controller calculates the temperature difference bet- will be operated by relay 2 in order to direct the surplus ween collector sensor S1 and tank sensor S2. If the diffe- energy to a heat dump. For security purpose this will be... - Page 13 SCU124 Adjustment Channels Channel Description Factory setting Page System DT O Switch-on temperature difference 12.0 °Ra [6.0 K] DT F Switch-off temperature difference 8.0 °Ra [4.0 K] DT S Nominal temperature difference 20.0 °Ra [10.0 K] Rise control R1 4 °Ra [2 K]...
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Page 14: Operation And Function
SCU124 2. Operation and function The controller is operated via three push buttons below the display. Button 1 is used for scrolling forward through the 2.1 Push buttons indication menu or to increase the adjustment values. But- ton 2 is used for scrolling backward and reducing values. -
Page 15: Flashing Codes
SCU124 System screen The system screen (active system layout) shows the system selected on the controller. It consists of several system component symbols, which are – depending on the current status of the system – either flashing, permanently shown or hidden. -
Page 16: Commissioning
SCU124 3. Commissioning Î Establish the power supply During a short initialization phase, the operating control lamp flashes red and green. When the controller is commissioned for the first time or after a reset, it will run a commissioning menu. The... - Page 17 SCU124 Arr: 4. System layout System layout selection Î Adjust the desired system layout of your solar thermal Adjustment range: 1 ... 3 system Factory setting: 1 For a detailed description of the different system layouts selectable, see chapter 1.4.
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Page 18: Channel Overview
SCU124 4. Channel overview 4.1 Display channels Note: The displayed values and adjustment channels depend on which system layout, which options and functions have been selected. Only values and adjustment channels available for the indivi- Indication of drainback time periods dual settings selected will appear in the menu. - Page 19 SCU124 Indication of current pump speed Indicates the current pump speed of the solar pump. n %: Current pump speed Display range: 30 ... 100 % Indicates the energy gained in heat quantity – only available kWh/MWh: Heat quantity if energy metering (OHQM) is activated.
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Page 20: Adjustment Channels
SCU124 4.2 Adjustment channels In this channel, a pre-defined system layout can be selected. System layout selection Each system layout has a set of pre-programmed settings Arr: that can be individually changed. System layout selection. If the system layout selection is changed later on, all adjust- Adjustment range: 1 ... - Page 21 SCU124 Maximum tank temperature Once the adjusted maximum temperature is exceeded, the solar pump is switched off and further loading of the S MX: tank is prevented to reduce scald risk or system damage. A Maximum tank temp. fixed hysteresis of 4 °Ra [2 K] is set for the maximum tank Adjustment range: temperature.
- Page 22 SCU124 Cooling functions In the following the three cooling functions – collector cooling, system cooling and tank cooling – are described in detail. The following notes are valid for all three cooling functions: Note: The cooling functions will not become active as long as solar loading is possible.
- Page 23 SCU124 Tank cooling function When the tank cooling function is activated, the controller aims to cool down the tank during the night in order to OSTC: prepare it for solar loading on the following day. Tank cooling option If the adjusted maximum tank temperature S MX is...
- Page 24 SCU124 Evacuated tube collector function O TC: This function helps overcome the disadvantages caused by Evacuated tube collector the non-ideal sensor position with some tube collectors. function This function is not required with the Vitosol 300-T, but is Adjustment range: OFF / ON required for the Vitosol 200-T.
- Page 25 Drainback option Note: A drainback system permits the heat transfer fluid to drain Viessmann Vitosol collectors cannot be used in back into the holding tank when solar energy is not coll- drainback systems. ected. The drainback option will initiate the filling of the Note: system when solar loading begins.
- Page 26 SCU124 Operating mode For control and service work, the operating mode of the controller can be manually adjusted. For this purpose, select MAN1 / MAN2: the adjustment value MAN1, MAN2 in which the following Operating mode adjustments can be made:...
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Page 27: Troubleshooting
SCU124 5. Troubleshooting fuse In the case of an error, a message is shown on the display of the controller: Warning symbols Operating control lamp VBus terminals ® sensor terminals load terminals ground terminals power supply terminals Operating control lamp flashes red. On the display the Operating control lamp off. -
Page 28: Various
SCU124 5.1 Various Pump is overheated, but no heat transfer from the Pump starts for a short moment, switches off, switches collector to the tank, flow and return have the same tem- on again, etc. perature; perhaps also air / gas bubbles in the lines. - Page 29 SCU124 Tanks cool down at night Control the non-return Further pumps which are valve in warm water cir- connected to the solar culation - o.k. tank must also be che- cked. Collector circuit pump runs during the night? Check controller:...
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Page 30: Accessories
SCU124 6. Accessories Smart Display SD3 The Smart Display is designed for simple connection to controllers with VBus . It is used ® for visualizing data issued by the controller: collector temperature, storage temperature and energy yield of the solar thermal system. The use of high-efficient LEDs and filter glass assures a high optical brilliance and good readability even in poor visibility conditions and from a larger distance. - Page 31 SCU124 Notes...
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Page 32: Impressum
As faults can never be excluded, please note: Your own calculations and plans, under con sider- the approval of Viessmann Manufacturing Company Inc.. ation of the current standards should only be basis for your This especially applies for copies, translations, microfilms projects.
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