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1 – SAS BIO SOLID boiler, 2 – open expansion vessel, 3 – check valve, 4 – differential
pressure control valve, 5 – circulatory pump of a domestic hot water system, 6 – domestic
hot water tank, 7 – four-way valve, 8 – circulatory pump of a central heating system, 9 –
central heating system, RW – expansion pipe, RB – pressure relief pipe, RO – venting pipe,
RP – overflow pipe, RS –signalling pipe
Figure.10.
General diagram for connection of the SAS BIO SOLID boiler to an open vented
central heating and domestic hot water system with a forced water circulation and a four-
-way valve.
