Installation Instructions

Specification
6 720 645 817 (2010/09)
29
2.4 Pressure drop, water side
The pressure drop on the water side is the pressure
differential between the boiler flow and return
connections of the gas condensing boiler. It depends on
the boiler size and the heating water flow rate.
Fig. 14 Pressure drop on the heating water side without check valve
x Flow rate in l/h
y Pressure drop on the heating water side in mbar
Fig. 15 Pressure drop on the heating water side with check valve (cascade)
x Flow rate in l/h
y Pressure drop on the heating water side in mbar