Operating instructions

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 l/hr.The chart below indicates the residual head of the pump available for the system.
m
Head and flow rate available
Fig. 10