1. Empfohlen wird auf dem Titel der Einsatz eines vollflächigen Hintergrundbildes (Format: 25,4 x 19,05 cm): Bild auf Master platzieren (JPG, RGB, 144dpi) Bild in den Hintergrund legen Empfohlen wird auf dem Titel der Einsatz eines vollflächigen Hintergrundbildes (Format: 25,4 x 19,05 cm): Bild auf Master platzieren (JPG, RGB, 144dpi) Bild in den Hintergrund legen Confidential / Copyright © Siemens Schweiz AG 2006 Cascade OEM Boiler & Burner Equipment

2. Seite 2 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions Hydraulic circuit - d.h.w. charging pump Up to 16 heat generators can be cascaded Only parallel cascades can be controlled One RVS controller for every heat generator

3. Seite 3 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions DHW charging pump Separate DHW heating circuit

4. Seite 4 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade Functions Common cascade pump Cascade return sensor Common Min. boiler return temp. with mixing valve Auxiliary functions

5. Seite 5 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions Basic diagram Release Setpoint State Release Setpoint State Release Setpoint State Boiler stage and release manager - Casc. management strategy - Lower/upper limit output range - Release and reset integral - Switch-on delay boilers Boiler setpoint shift - Consumer demands - Common flow demand Equalizing of operating hours - Autom. Change of boiler sequence - Exclusion Cascade control Remark: Boiler release only below an adjustable outside temperature

6. Seite 6 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions Release lag boiler – modulating boiler Switch on/off boilers before having a temperature deficide/overheat on B10 (TVK) Required temperature on the consumer side Optimum efficiency with condensing boilers

7. Seite 7 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions time power Upper / lower limit output range Heat demand

8. Seite 8 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions Cascade management strategy Strategy 1 ON as late as possible and OFF as early as possible -> Lowest possible number of boilers in operation -> Non condensing boilers

9. Seite 9 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions Cascade management strategy Strategy 2 ON as late as possible and OFF as late as possible -> Lowest possible number of switching cycles

10. Seite 10 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions Cascade management strategy Strategy 3 ON as early as possible and OFF as late as possible -> Longest possible running times for lag boilers -> Condensing boilers

11. Seite 11 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions 2-stage boiler: Second stage of boiler with priority 1 has the temperature control -> ON/OFF Boiler/stage sequence

12. Seite 12 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions Cascading two 1-stage boilers with one RVS63 QX1, QX2 can be set as boiler pump B2 has always to be connected Its possible to connect additional RVS63 controlling two 1-stage boiler each -> Cascade flow sensor B10 has to be connected

13. Seite 13 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS – Cascade functions LPB Seg/Dev 0/2 0/3..... 0/160/1 2 LMU84 OCI364.0xx 316 RVS43/63 1 Cascading BMUs with OpenTherm Bus

14. Seite 14 July 2006 Confidential / Copyright © Siemens Schweiz AG 2006 Building Technologies / HVAC ProductsMarco Serafini RVS - Cascade Functions Exercise 3: Y1 Q2 K4/5 B3 Q3 B2 B9 Y5 Q6 B12 Adress 1…3 Par. 6212: Check number of heat source 1 1 Par. 6213: Check number of heat source 2 0 Par. 6215: Check number of storage tank 4 Par. 6217: Check number of heating circuit 303 Demo case 1: LPB Adress 1 Demo case 2: LPB Adress 2 Demo case 3: LPB Adress 3