Viessmann SCU345 Manual
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Viessmann SCU345 Manual

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SCU345
Manual for the
specialized craftsman
Installation
Operation
Functions and options
Troubleshooting
Thank you for buying this product.
en-US/CA
Please read this manual carefully to get the best performance from this unit. Please keep this
Manual
manual carefully.
5619460 v1.0 04/2012

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  • Page 1 SCU345 Manual for the specialized craftsman Installation Operation Functions and options Troubleshooting Thank you for buying this product. en-US/CA Please read this manual carefully to get the best performance from this unit. Please keep this Manual manual carefully. 5619460 v1.0 04/2012...

  • Page 2: Table Of Contents

    Safety advice Information about the product Contents Please pay attention to the following safety advice Overview ............ 3 Proper usage in order to avoid danger and damage to people and Installation ..........4 The solar controller is designed for use in 2-tank and property.

  • Page 3: Overview

    • Energy-saving switch-mode power supply into patch panels Display: System-Monitoring-Display for system visu- Included: alization, 16-segment display, 7-segment display, 9 sym- 1 x SCU345 bols, control lamp (directional pad) and background illumination 1 x accessory bag 3 x screw and wall plug...

  • Page 4: Installation

    Installation Electrical connection Mounting Note ATTENTION! ESD damage! Strong electromagnetic fields can impair the Electrostatic discharge can lead to function of the controller. damage to electronic components! Î Make sure the controller as well as the Î Take care to discharge system are not exposed to strong elec- properly before touching screw...

  • Page 5: Data Communication / Bus

    ® ® R1-R3 1 (1) A (100 ... 240) V~ 2 (1) A (100 ... 240) V~ er (not included with the SCU345). With the ServiceCenter Software (RSC), measured Temp. Sensor IP 20 values can be read, processed and visualized.

  • Page 6: Sd Memory Card Slot

    2 tanks (valve logic) west collectors (page 31) (page 28) Note The SCU345 can also be used to control 1-tank systems. For 1-tank sytsems, select system 1 or system 3, and turn sub channel I setting LST2 off. (page 45)

  • Page 7: System Layouts

    System layouts System 1 2-tank system with valve logic, 1 pump, 3 sensors and 3-port valve The controller compares the temperature at sensor pump (R1) will be activated and the corresponding S1 to the temperatures at sensors S2 and S4. If the tank will be loaded up to the adjusted maximum measured temperature differences are higher than temperature via the valve (R3).
  • Page 8 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra] Set temperature difference 1...
  • Page 9 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page PRIO1 Priority logic tank 1 OSTS Tank set option TST1 45 °C [120 °F] Set tank temperature tank 1 TST2 45 °C [120 °F] Set tank temperature tank 2 2 min Loading break time tRUN...
  • Page 10 System 2 2-tank solar system with valve logic and heat exchange control The controller compares the temperature at sensor pump (R1) will be activated and the corresponding possible with another temperature differential func- S1 to the temperatures at sensors S2 and S4. If the tank will be loaded up to the adjusted maximum tion (S3-heat sink / S5-heat source).
  • Page 11 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra] Set temperature difference 1...
  • Page 12 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page 2 min Loading break time tRUN 15 min Circulation runtime PSPEE Pause speed option PDELA Pump delay option COOL > Cooling functions OSYC* System cooling OSTC Tank cooling OHDP*...
  • Page 13 System 3 2-tank solar system with pump logic The controller compares the temperature at sensor pump (R1 and/or R2) will be activated and the cor- S1 to the temperatures at sensors S2 and S4. If the responding tank will be loaded up to the adjusted measured temperature differences are higher than maximum temperature at most.
  • Page 14 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra] Set temperature difference 1...
  • Page 15 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page OSTS Tank set option TST1 45 °C [120 °F] Set tank temperature tank 1 TST2 45 °C [120 °F] Set tank temperature tank 2 Spread function option DTSE 20 K [40 °Ra] Spread difference...
  • Page 16 System 4 2-tank solar system with pump logic and heat exchange control The controller compares the temperature at sensor (R1 and/or R2) will be activated and the correspond- Heat exchange from tank 2 to tank 1 (R3) is possi- S1 to the temperatures at sensors S2 and S4. If the ing tank will be loaded up to the adjusted maximum ble with another temperature differential function measured temperature differences are higher than the...
  • Page 17 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra] Set temperature difference 1...
  • Page 18 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page DTSE 20 K [40 °Ra] Spread difference SLSTR Spread function option 2 min Loading break time tRUN 15 min Circulation runtime PSPEE Pause speed option COOL >...
  • Page 19 System 5 3-tank solar system with valve logic and priority logic The controller compares the temperature at sensor pump (R1) will be activated and the corresponding the valve type used, the corresponding valve logic has S1 to the temperatures at sensors S2, S4 and S5. If tank will be loaded up to the adjusted maximum tem- to be selected.
  • Page 20 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number VLOG Valve logic LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra]...
  • Page 21 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page CFR F 5.0 °C [42.0 °F] Antifreeze temperature collector off FRPST Antifreeze tank selection LLOGI > Loading logic LOGIC PRIO Priority logic PRIO1 Priority logic tank 1 OSTS Tank set option TST1...
  • Page 22 System 6 3-tank solar system with pump logic and priority logic The controller compares the temperature at sensor (R1, R2 and/or R3) will be activated and the corre- S1 to the temperatures at sensors S2, S4 and S5. If the sponding tank will be loaded up to the adjusted maxi- measured temperature differences are higher than the mum temperature at most.
  • Page 23 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra] Set temperature difference 1...
  • Page 24 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page LOGIC PRIO Priority logic PRIO1 Priority logic tank 1 PRIO2 Priority logic tank 2 OSTS Tank set option TST1 45 °C [120 °F] Set tank temperature tank 1 TST2 45 °C [120 °F] Set tank temperature tank 2...
  • Page 25 System 7 Note Solar system with vertical tank loading and 2nd tank A solar system with vertical tank loading is implemented as a 2-tank system. (tank bot- The controller compares the temperature at sensor the corresponding tank or tank zone will be loaded up tom = tank 1;...
  • Page 26 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number VLOG Valve logic LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra]...
  • Page 27 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page CFR F 5.0 °C [42.0 °F] Antifreeze temperature collector off FRPST Antifreeze tank selection LLOGI > Loading logic LOGIC PRIO Priority logic PRIO1 Priority logic tank 1 PRIO2 Priority logic tank 2 OSTS...
  • Page 28 System 8 Solar system with east-/west collectors and 2 tanks (valve logic) The controller compares the temperatures at the col- es is higher than the adjusted switch-on temperature will be loaded up to the adjusted maximum tempera- lector sensors S1 and S3 to the temperatures at S2 differences, the corresponding pump (R1, R2) or both ture via the valve (R3).
  • Page 29 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra] Set temperature difference 1...
  • Page 30 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page TCEN2 19:00 Evacuated tube collector ending time 2 TCRU2 30 s Evacuated tube collector runtime 2 TCIN2 30 min Evacuated tube collector standstill interval 2 LLOGI >...
  • Page 31 System 9 3-tank solar system with east-/west collectors The controller compares the temperatures at the col- temperature differences is higher than the adjusted ing tank will be loaded up to the adjusted maximum lector sensors S1 and S3 to the tank temperatures switch-on temperature differences, the corresponding temperature via the valves R3, R4.
  • Page 32 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page System ROSA 0000 ROSA number VLOG Valve logic LOAD1 > Loading 1 DT1O 6.0 K [12.0 °Ra] Switch-on temperature difference 1 DT1F 4.0 K [8.0 °Ra] Switch-off temperature difference 1 DT1S 10.0 K [20.0 °Ra]...
  • Page 33 Adjustment channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page OCMI2 Collector minimum limitation option 2 CMIN2 10.0 °C [50.0 °F] Minimum collector temperature 2 OTCO2 Evacuated tube collector function option 2 TCST2 07:00 Evacuated tube collector starting time 2 TCEN2 19:00 Evacuated tube collector ending time 2...
  • Page 34 Electrical connection of a high-efficiency pump (HE pump) Speed control of a HE pump is possible via a PWM Temp. Sensor Pt1000 signal. In addition to the relay connection, the pump must also be connected to the controller via the VBus ®...

  • Page 35: Operation And Function

    Operation and function Selecting menu points and adjusting Menu structure Buttons values Status level During normal operation of the controller, the display TCOL is in the status level. TST1B In order to leave the status level and access the menu level, press button 6.

  • Page 36: Shortcut

    Note Indications and system monitoring display Some of the menu items depend on the selected system and the adjusted options. The additional symbols in the tool bar indicate The system monitoring display consists of 3 areas: Therefore, they are only displayed if they are the current system state.
  • Page 37 System screen in the system monitoring display The system selected is indicated in the system moni- toring display. It consists of several system component symbols which are – depending on the current status of the system – either flashing, permanently shown Upper tank or “hidden”.

  • Page 38: Further Indications

    Further indications Initial commissioning Display Description Temperature sensor 5 Fault indication When the hydronic system is filled and ready for op- DTS1 Temperature heat source ∆T function If the controller detects a malfunction, the directional eration, connect the controller to the power supply. pad flashes red and the symbols of the warning trian- DTS2 The controller runs an initialization phase in which...
  • Page 39 1. Language: Î Adjust the desired menu language. 2. Unit: Î Adjust the desired unit. 3. Time: Î Adjust the clock time. First of all adjust the hours, then the minutes. Date: Î Adjust the date. First of all adjust the year, then the month and then the day.
  • Page 40 Valve logic: Note Î Adjust the valve variant of the 3-port valves The valve variant can only be adjusted in systems with two 3-port valves (ARR 5,7,9). Maximum tank temperature: Î Adjust the maximum tank temperature In 3-tank systems, the adjustment has to be car- ried out for S2MAX and S3MAX as well.

  • Page 41: Functions And Options

    Functions and options Displays the current tank temperature. • TST1T : Temperature tank 1 top Status level • TST1B : Temperature tank 1 bottom • TST2T : Temperature tank 2 top Note • TST2B : Temperature tank 2 bottom The values and adjustment channels shown depend on the selected system, the func- in 3-tank systems only: DTS1, DTS2, SENTH,...
  • Page 42 Display of speed Display of heat quantity Display of monitoring period n1% , n2% , n3% kWh/MWh: CDIS Current pump speed Heat quantity in kWh / MWh Countdown of the monitoring period Display range: Display range: 30 ... 100 % Indicates the heat quantity produced in the system.

  • Page 43: Adjustment Channels

    Display of heating period Display thermostat function active Selecting the system TDIS THERM System Heating period Thermostat function active Adjustment range: 1 ... 9 Display range: Factory setting: 1 0:00 ... 23:59 (hh:mm) Display of blocking protection time Selection of the appropriate system. Each system If the thermal disinfection option (OTDIS) is activat- has pre-programmed options and adjustments which ed and the heating period is in progress, the remaining...
  • Page 44 If the tank temperature reaches the adjusted maxi- mum temperature, the tank will no longer be loaded in order to avoid damage caused by overheating. The symbol is shown on the display if the tank tem- perature exceeds the maximum value. The corresponding reference sensor can be chosen, see “Sensor maximum tank temperature”.
  • Page 45 Loading tank 2 and tank 3 Adjustment for a high-effi ciency pump (HE pump) Note with speed control via adapter: When loads which are not speed-controlled • ADAP : Pump on / pump off; the corresponding (e. g. valves) are used, the value of the cor- relay (R1 ...
  • Page 46 Collector emergency shutdown solar pump is activated until the collector tempera- ture falls below the maximum collector temperature. The tank temperature may then exceed the maximum temperature, but only up to 95 °C [200 °F] (emer- gency shutdown of the tank). If the collector cooling is active, is displayed (fl ashing).
  • Page 47 been active before the loading break time remains ac- tive during the loading break time, unless the evacu- ated tube collector function of the inactive fi eld be- comes active. Antifreeze function COL / OTCO (1, 2) / TCST (1, 2) COL / OTCO (1, 2) / TCIN (1, 2) Starting time Standstill interval...
  • Page 48 Note This function can only become active if the tank temperature is higher than the collec- tor temperature. Note LLOGI / tLB COL (1) / OCFR / CFR F Since this function uses the limited heat Loading break time Antifreeze temperature off quantity of the tank, the antifreeze function Adjustment range: 1 ...
  • Page 49 The priority tank will be loaded if its switch-on condi- This option is only available if each tank has its own 5. In systems with 3 tanks or 2 tanks and vertical tank loading, bLO loading is possible. This means that 2 tions are fulfi lled and if it is not blocked.
  • Page 50 Tank set option unless it is blocked. If the temperature difference falls by 2 K [4 °Ra] below DTSE, the absorption tank will no longer be loaded. LLOGI / TST3 Set temperature tank 3 LLOGI / OSTS Adjustment range: 4 ... 85 °C [38 ... 184 °F] Tank set option LLOGI / PRIO / DTSE in steps of 1 °C [2 °F]...
  • Page 51 Note If the pump delay is activated, the corresponding relay for the valve will be energized fi rst. The pump(s) will If the tank set option is actived along with be activated with the delay time (200s). the spreaded loading function, the spreaded loading function will only be active until Note the set temperature of the selected tank is...
  • Page 52 Tank cooling A selection can be made between pump logic and valve logic (OTPUM ON = pump logic, OTPUM OFF = valve logic). If pump logic is selected, the relay for solar loading switches off and the relay for heat dump remains switched on.
  • Page 53 Note Minimum temperature limitation for the heat exchange The heat exchange function is only available in arrangement 2 and 4. Maximum temperature limitation for the heat exchange DT4 / DT4S Set temperature difference Adjustment range: ... 50.0 K [3.0 ... 90.0 °Ra] DT4 / MIN4O in steps of 0.5 K [1.0 °Ra] Switch-on temperature...
  • Page 54 If the adjusted value TH1O is exceeded, the relay ∆T function will be switched on. If the temperature falls below the adjusted value TH1F, the relay will be switched off. Maximum limitation for the ∆T function ODTFT / DT4F Switch-off difference ODTFT Adjustment range: 0.5 ...
  • Page 55 OTH / t1O ODTFT / DTREL Switch-on time 1 Thermostat function Relay Adjustment range: ON / OFF Selection: System 1: R2, R4 Adjustment range: 00:00 ... 23:45 Factory setting: OFF Factory setting: 06:00 System 3: R3, R4 in steps of 15 min Factory setting: 4 In order to block the thermostat function for a cer- The relay for the ∆T function can be selected.
  • Page 56 pose, select the adjustment value MAN.The following adjustments can be carried out: Auto : relay in automatic mode ON : relay is switched on OFF : relay is switched off OTH / t2 (3) O OTH / RTH nLO : relay is switched with adjusted minimum Switch-on time 2 (3) speed Thermostatic backup heating relay...
  • Page 57 Option: Thermal disinfection (OTDIS) If the disinfection conditions have been fulfi lled by solar loading before the monitoring period ends, ther- mal disinfection is considered complete and a new monitoring period begins. Note If the thermal disinfection option OTDIS OTDiS / DDIS is activated, the display channels TDIS and Disinfection period CDIS will be displayed.
  • Page 58 If, before the delay time has elapsed, the disinfection The relay for the thermal disinfection function can be Energy metering conditions are fulfi lled by solar loading, thermal disin- selected. fection is considered complete and a new monitoring Parallel relay period begins.
  • Page 59 Note Energy metering with V40 fl owmeter The energy metering calculation (estima- The energy metering calculation uses the difference tion) uses the difference between the fl ow between the fl ow and return temperatures and the and return temperatures and a fl ow rate val- volume fl ow transmitted by the fl owmeter.
  • Page 60 Time and date Valve logic DatE/DD DatE/TIME VLOG Adjustment range: 01 ... 31 Time Valve logic Factory setting: 15 Adjustment range: 00:00 ... 23:59 Adjustment range: 1, 2, 3, 4 The date and time can be entered. Both are required Factory setting: 12:00 Factory setting: 1 for the thermostat function.
  • Page 61 Language OSDC / LOGI OSDC / FORM Logging interval Format card LANG Adjustment range: 1 ... 1200 s Formatting the SD card Language Factory setting: 60 s Î Select the menu item FORM Adjustment range: dE, En, ES, Fr Î During the formatting process, --FORM will be Factory setting: En displayed.

  • Page 62: Overview Of Options And Their Para Meters

    Overview of options and their para- meters In the following, the additional options and para- have been selected. Some of the options and para- meters are listed. meters will only be displayed, if they are available with the individual adjustments. The options and parameters displayed depend on the system as well as on the options and functions which Channels...
  • Page 63 Channels Channel Sub channel 1 Sub channel 2 Factory setting Change to Description Page n1LO 30 % Minimum speed n1HI 100 % Maximum speed PUMP2 OnOF Speed variant pump 2 n2LO 30 % Minimum speed n2HI 100 % Maximum speed PUMP3 OnOF Speed variant pump 3...

  • Page 64: User Code And Short Menu - Adjustment Values

    User code and short menu - Messages Adjustment values In the case of an error, the directional pad flashes red and a message is indicated in the status display. A Code warning triangle is additionally indicated. If more than Î In order to restrict the access, enter 0000 in the The access to some adjustment values can be restrict- one error or fault condition has occurred, only the menu item CODE.

  • Page 65: Troubleshooting

    Troubleshooting The directional pad is permanently off. Directional pad flashes red. The symbol is in- If a malfunction occurs, a message will appear on the dicated on the display and the symbol flashes. display of the controller. Sensor fault. An error code instead of a tem- Check the power supply of the controller.

  • Page 66: Miscellaneous

    Miscellaneous Pump is overheated, but no heat transfer from Pump starts for a short moment, switches off, The temperature difference between tank and col- the collector to the tank, flow and return have switches on again, etc. lector increases enormously during operation; the the same temperature;...
  • Page 67 Tanks cool down at night. Warm water outflow upwards? Further pumps which are connected to the solar tank must also be checked. Collector circuit pump runs during the night? Change connection and let the water flow sidewards or Check the non-return valve in warm water cir- through a siphon (down- culation - o.k.

  • Page 68: Accessories

    Accessories The solar circuit pump does not work, although the 10.1 Sensors and measuring instruments Turn the pump shaft using a collector is considerably warmer than the tank. screwdriver; now passable? Operating control lamp of the controller illumi- nated? Pump is defective - replace it.

  • Page 69: Interface Adapters

    10.2 Interface adapters 10.3 Visualization modules 10.4 DL2 Datalogger Interface adapters VBus / USB ® The new VBus / USB interface adapter is the inter- ® face between the controller and a personal compu- Smart Display SD3 DL2 Datalogger ter. With its standard mini-USB port it enables a fast The Smart Display is designed for simple connection This additional module enables the acquisition and transmission of system data for processing, visualising...

  • Page 70: Index

    Index Operating hours counter ..........42 Antifreeze function ............47 Parallel relay ..............58 Blocking protection time, display channel ....43 Pause control ..............51 Priority logic ..............48 Collector cooling ............46 Pump control ..............45 Collector emergency shutdown ........ 46 Collector temperatures, display channel ....
  • Page 71 Notes...
  • Page 72 This mounting- and operation manual including all parts is copyrighted. Another The texts and drawings in this manual are correct to the best of our knowledge. As use outside the copyright requires the approval of Viessmann Manufacturing Com- faults can never be excluded, please note: pany Inc.

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