By pass and Pump
The boiler is fitted with a pre-adjusted by pass. Although adjustment is not normally necessary, the by pass can be reset by
turning screw ( D Fig. 9 ) anticlockwise to open the by-pass using the chart below for guidance.
If used on a system with thermostatic radiator valves, the flow rate with the thermostatic valves closed should be adjusted to
at least 100 I/hr.The chart below indicates the residual head of the pump available for the system.
D
Head and flow rate available
m Hz0 I<- MInImum flow rate
5
4
3
2
1
0
0 100 200 300 400 600 600 700 800 90010001100I/h
Fig. 10
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