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Instructions for the installer
3.16 Available head
The boiler is equipped with a high-efficiency circulation pump with variable speed.
Circulation pump speed is automatically managed by the electronics, according to the settings of boiler parameters.
It is possible to choose between two pump working modes:
1. “Constant ΔT” operation
In the constant ΔT operating mode, circulation pump speed changes automatically to keep system delivery and return ΔT fixed at a value set
in the boiler parameters.
2. "Fixed speed" operation
In the fixed speed operating mode, circulation pump speed remains constant at a value set in the boiler parameters.
During DHW phase, circulation pump works at a fixed speed set in the boiler parameters.
WARNING
Circulation pump is set to constant ΔT operating mode during production.
For a correct operation of the boiler, it is recommended not to change factory setting.
Should it be necessary to change circulation pump settings, contact a Service Centre.
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100%
72%)
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Fig. 17 Available head KB 24
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Fig. 18 Available head KB 32
Q . . . . . . . . . . . . . . . . . Flow rate (l/h)
H . . . . . . . . . . . . . . . . . Available head (mbar)
