Cascade OEM Boiler & Burner Equipment
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RVS – Cascade functions Hydraulic circuit - DHW 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
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RVS – Cascade functions Bivalent operation OeG B2
B10
HP
T
T
E9
E10
P
P
B91
Each heat generator can be released depending on an adjustable outside temperature
Q9
K1/E11
T
Q1
Q8
T
OeG ON below Tout Par. 2203 HP ON above Par. 2910
B71
Bivalent-alternative operation
Bivalent-partial parallel operation
Bivalent point
Release
HP
Release
OeG 30
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Release
HP
-10 -20 10°C 0°C Composite outside temperature
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Release
OeG
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-30 °C
30
20
10 -10 -20 0°C Composite outside temperature
-30 °C
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RVS – Cascade functions Basic diagram Generator stage / 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
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B2
T
Release Setpoint State Q1
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B2
T
Release Setpoint State Q1
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RVS – Cascade functions DHW preparation All heat generators work in DHW mode
B10
1
2
B3
4
3
2379S35
B70
Dedicated heat generator for DHW charge
B10
2
3
4
B70
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2379S36
1
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RVS – Cascade functions Cascade management strategy
TK1
TK2
Q1
TKn TVK
v vv vv
Q1
v vv vv
Q1
vv vv v
Q1
TRL
• Switch on/off heat generators before having a temperature loss/overheat on B10 (TVK) -> cascade management strategies • Required temperature on the consumer side -> heat generator temperature setpoint boost • Avoid too high return temperature -> Delta T (flow, return) supervision Seite 6
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RVS – Cascade functions Cascade management strategy - Example value boiler control: upper limit 90%, 40% -> adjustable Upper / lower limit output range Default Default value heat pump control: lower limit 100%, 40% -> not adjustable power LeistBandMax = 80% LeistBandMin = 40%
Boiler 4
400
Heat demand
Boiler 3
300
Boiler 2
200
Boiler 1
100
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time Confidential / Copyright Š Siemens Schweiz AG 2006 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
90
9 6 00 4 5 6 9 09 0 66 00 9 09 09 0 6 7 5 .6 7 5 .6 7 5 .6 7 5 .1 3 0 2 3 7 0 Z a
% 4 0 3 0
0 4
0 70 7 2 2 0 8 102 0 8 1 1 00 9904590 3 1 01 K K 1 K 1 K + K
67.5
200 67.5
180
67.5
90
90
60
100
90
60
180
90
-> Lowest possible number of boilers in operation -> Non condensing boilers
90
270
67.5
90 60
45
30
90
90
60
45
90
K+ 1K
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1K
1K
1K
1K
1K
1K
1K
1K
1K
Confidential / Copyright Š Siemens Schweiz AG 2006 Building Technologies / HVAC Products
2370Z22b
RVS – Cascade functions Cascade management strategy % 400
400
Strategy 2 ON as late as possible and OFF as late as possible
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
40
60
45
67.5
60 45
30
40
60
45
90
K+ 1K
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1K
1K
1K
1K
1K
1K
1K
1K
1K
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RVS – Cascade functions Cascade management strategy 400
400
Strategy 3 ON as early as possible and OFF as late as possible
2370Z22c
%
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
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1K
1K
1K
1K
1K
1K
1K
1K
1K
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RVS – Cascade functions Cascade management strategy - sequence Boiler/stage sequence
Heat pump/stage sequence
Heat Generator
Heat Generator
lI
l
lV
Stage 2/ Modul.
Stage 1
Stage 1
Stage 2/ Modul.
Stage 2/ Modul.
lII
Stage 1
Stage 1
Stage 2/ Modul.
Stage 2/ Modul.
lI
Stage 1
Stage 1
Stage 2/ Modul.
Stage 2/ Modul.
Stage 1
1
2
3
4
5
6
7
8
Pw
Boiler control: Second stage of boiler with priority 1 has the temperature control -> ON/OFF Modulating burners are allowed to modulate
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l
P Heat Generator
2370D01c
lII
Stage 2/ Modul.
2370D01c
lV
P Heat Generator
Stage 1
1
2
3
4
5
6
7
8
Pw
Heat pump: The last heat pump stage switching on has the temperature control -> ON/OFF El. Immersion heater will switch on after Confidential / Copyright Š Siemens Schweiz AG 2006 the heat pump stages. Building Technologies / HVAC Products
RVS – Cascade Functions Auxiliary 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 Only RVS43, 63
B10 T
Q25 T
B70
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RVS – Cascade functions Auxiliary functions – RVS63
Cascading two 1-stage boilers with one RVS63
B2
• 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
T1/T2
QX4
QX1
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QX2
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RVS – Cascade functions Boiler with external boiler temperature control Cascading BMU’s with OpenTherm Bus 1 RVS43/63
LPB Seg/Dev
0/2
0/3
OCI364.0xx
2
3
.....
0/16
0/1
16
LMU84
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