Cascade
OEM Boiler & Burner Equipment
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Confidential / Copyright © Siemens Schweiz AG 2006
RVS – Cascade functions
Hydraulic circuit - d.h.w. charging pump
B10
T
B2
T
K4/K5
B2
UX
Y17/
Y18
K4
T
B2
T
B91
E9
E10
P
P
Q9
K1/E11
T
Q1
Q1
Q1
Q8
T
B71
 Up to 16 heat generators can be cascaded
 Only parallel cascades can be controlled
 One RVS controller for every heat generator
Seite 2
July 2006
Marco Serafini
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Building Technologies / HVAC Products
RVS – Cascade functions
DHW charging pump
B10
1
2
B3
4
3
2379S35
B70
Separate DHW heating
circuit
B10
2
3
4
B70
Seite 3
July 2006
Marco Serafini
2379S36
1
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products
RVS – Cascade Functions
Auxiliary functions
B10
T
Cascade return sensor
B70
Common cascade pump
B10
T
Q25
T
B70
Common Min. boiler return
temp. with mixing valve
B10
T
Q25
T
B70
Seite 4
July 2006
Marco Serafini
Y25/Y26
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Building Technologies / HVAC Products
RVS – Cascade functions
Basic diagram
Boiler stage and release manager
- Casc. management strategy
- Lower/upper limit output range
- Release and reset integral
- Switch-on delay boilers
Equalizing of operating hours
- Autom. Change of boiler sequence
- Exclusion
Boiler setpoint shift
Cascade control
- Consumer demands
- Common flow demand
B10
T
B2
T
Release
Setpoint
State
Q1
Seite 5
B2
T
Release
Setpoint
State
Q1
July 2006
B2
T
Release
Setpoint
State
Q1
Marco Serafini
Remark:
Boiler release only below an
adjustable outside temperature
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products
RVS – Cascade functions
Release lag boiler – modulating boiler
TK1
TK2
Q1
TKn
TVK
v v v v v
Q1
v v v v v
Q1
v v v v v
Q1
TRL
• Switch on/off boilers before having a temperature deficide/overheat
on B10 (TVK)
• Required temperature on the consumer side
• Optimum efficiency with condensing boilers
Seite 6
July 2006
Marco Serafini
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products
RVS – Cascade functions
Upper / lower limit output range
power
LeistBandMax = 80%
LeistBandMin = 40%
Boiler 4
400
Heat demand
Boiler 3
300
Boiler 2
200
Boiler 1
100
Seite 7
July 2006
Marco Serafini
time
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Building Technologies / HVAC Products
RVS – Cascade functions
Cascade management strategy
400
400
130
Strategy 1
ON as late as possible
and
OFF as early as possible
2370Z22a
%
300
270
2370Z22a
%
400
130
400
300
270
90
90
67.5
270
200
180
90
90
67.5
90
60
67.5
180
90
60
100
45
60
67.5
90
90
90
60
45
90
30
K+
1K
1K
1K
1K
1K
1K
1K
1K
1K
200
180
67.5
90
90
60
100
90
60
67.5
180
90
-> Lowest possible number
of boilers in operation
-> Non condensing boilers
1K
90
90
67.5
270
67.5
90
60
45
30
90
90
60
45
90
K+
1K
Seite 8
July 2006
Marco Serafini
1K
1K
1K
1K
1K
1K
1K
1K
1K
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products
RVS – Cascade functions
Cascade management strategy
400
400
Strategy 2
ON as late as possible
and
OFF as late as possible
2370Z22b
%
300
67.5
280
270
180
200
67.5
180
120
60
-> Lowest possible number
of switching cycles
40
90
67.5
120
60
100
45
60
67.5
60
40
45
45
30
40
60
45
90
K+
1K
Seite 9
July 2006
Marco Serafini
1K
1K
1K
1K
1K
1K
1K
1K
1K
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products
2370Z22c
RVS – Cascade functions
Cascade management strategy
%
400
400
Strategy 3
ON as early as possible
and
OFF as late as possible
280
300
-> Longest possible running
times for lag boilers
-> Condensing boilers
200
30
120
90
30
30
30
30
40
30
30
30
45
30
60
30
30
40
60
45
30
90
40
100
30
120
K+
1K
Seite 10
July 2006
Marco Serafini
1K
1K
1K
1K
1K
1K
1K
1K
1K
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products
RVS – Cascade functions
Cascading two 1-stage boilers with one RVS63
B2
T1/T2
QX4
QX1
Seite 12
July 2006
QX2
Marco Serafini
2373z38
• 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
B9
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products
RVS – Cascade functions
Cascading BMU’s with OpenTherm Bus
1
RVS43/63
LPB Seg/Dev
0/2
0/3
2
3
OCI364.0xx
.....
0/16
0/1
16
LMU84
Seite 13
July 2006
Marco Serafini
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products
RVS - Cascade Functions
Exercise 3:
Q3
Demo case 1:
LPB Adress 1
Y1
Y5
Q2
Q6
B9
B2
B2
B12
B3
Demo case 2:
LPB Adress 2
K4/5
Demo case 3:
LPB Adress 3
Par. 6212:
Par. 6213:
Par. 6215:
Par. 6217:
Seite 14
Check number of heat source 1
Check number of heat source 2
Check number of storage tank
Check number of heating circuit
July 2006
Marco Serafini
Adress 1…3
1
0
4
303
Confidential / Copyright © Siemens Schweiz AG 2006
Building Technologies / HVAC Products