The pump bypass system protects the boiler from a sudden increase in hot water pressure in the event of a power failure to the controller and central heating pump. The differential valve is closed during normal pump operation. Shut-off valves should be installed before and after the pump – this way, during maintenance and inspection of the pump, it will not be necessary to drain the entire installation of water. In the case of a boiler equipped with control automation that protects against excessively high temperature, it is advisable to install the circulation pump on the supply side.
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