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Cascade

Cascade. OEM Boiler & Burner Equipment. 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. RVS – Cascade functions. DHW charging pump.

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Cascade

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  1. Cascade OEM Boiler & Burner Equipment

  2. RVS – Cascade functionsHydraulic 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. RVS – Cascade functions DHW charging pump Separate DHW heating circuit

  4. RVS – Cascade Functions Auxiliary functions Cascade return sensor Common cascade pump Common Min. boiler return temp. with mixing valve

  5. Release Setpoint State Release Setpoint State Release Setpoint State RVS – Cascade functionsBasic diagram Equalizing of operating hours - Autom. Change of boiler sequence - Exclusion 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 Cascade control Remark: Boiler release only below an adjustable outside temperature

  6. RVS – Cascade functionsRelease 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. RVS – Cascade functions Upper / lower limit output range power Heat demand time

  8. RVS – Cascade functionsCascade 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. RVS – Cascade functionsCascade management strategy Strategy 2 ON as late as possible and OFF as late as possible -> Lowest possible number of switching cycles

  10. RVS – Cascade functionsCascade 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. 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

  12. 1 RVS43/63 3 16 2 OCI364.0xx LMU84 RVS – Cascade functions Cascading BMU’s with OpenTherm Bus LPB Seg/Dev 0/2 0/3 ..... 0/16 0/1

  13. Y1 Y5 Q3 B9 Q2 Q6 B2 B2 B12 B3 K4/5 RVS - Cascade Functions Exercise 3: Demo case 1: LPB Adress 1 Demo case 2: LPB Adress 2 Demo case 3: LPB Adress 3

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