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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

Cascade

OEM Boiler & Burner Equipment

rvs cascade functions hydraulic circuit d h w charging pump
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
rvs cascade functions
RVS – Cascade functions

DHW charging pump

Separate DHW heating

circuit

rvs cascade functions1
RVS – Cascade Functions

Auxiliary functions

Cascade return sensor

Common cascade pump

Common Min. boiler return temp. with mixing valve

rvs cascade functions basic diagram

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

rvs cascade functions release lag boiler modulating boiler
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
rvs cascade functions2
RVS – Cascade functions

Upper / lower limit output range

power

Heat demand

time

rvs cascade functions cascade management strategy
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

rvs cascade functions cascade management strategy1
RVS – Cascade functionsCascade management strategy

Strategy 2

ON as late as possible

and

OFF as late as possible

-> Lowest possible number of switching cycles

rvs cascade functions cascade management strategy2
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

rvs cascade functions3
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
rvs cascade functions4

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

rvs cascade functions5

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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