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Fig.33
Traditional cascade control
management
4
+3K
-3K
3
2
1
0
4
8
Fig.34
Parallel cascade control
management
2
+3K
-3K
1
0
4
8
7.6
Connecting diagrams
Tab.28
Explanation of symbols in the hydraulics flow diagram
Symbol
7725087 - v.01 - 06062019
5
6
x
4
8
AD-3000960-01
3
4
Temperature type cascade algorithm; the setpoint sent to the running
boiler is:
Output; requested by the zones.
Temperature; output setpoint requested by the zones + error calculation.
Output type cascade algorithm; the setpoint sent to the running boiler is:
x
4
8
AD-3000961-01
Output; according to PI algorithms.
Temperature; -90°C
7.6.1
Explanation
Return pipe
Flow pipe
Mixing valve
Pump
Domestic hot water
Make contact
Outdoor temperature sensor
Sensor
Safety thermostat
Room thermostat
Plate heat exchanger
1 First boiler starts running when system temperature is 3°C below
set point.
2 After 4 minutes the second boiler starts running if ΔT< 6K and the
system temperature is still more than 3°C below set point.
3 After 8 minutes the third boiler starts running if ΔT< 6K and the
system temperature is still more than 3°C below set point.
4 First boiler stops running when system temperature is 3°C above
set point.
5 After 4 minutes the second boiler stops running if ΔT< 6K and the
system temperature is still more than 3°C above set point.
6 After 8 minutes the third boiler stops running if ΔT< 6K and the
system temperature is still more than 3°C above set point.
1 All boilers in cascade start running when system temperature is
3°C below set point.
2 First boiler stops running when system temperature is 3°C above
set point.
3 After 4 minutes the second boiler stops running if ΔT< 6K and the
system temperature is still more than 3°C above set point.
4 After 8 minutes the third boiler stops running if ΔT< 6K and the
system temperature is still more than 3°C above set point.
Symbols used
7 Installation examples
AMC Pro
31
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