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F.A.Q.

 

How do I recognise if a check valve is activated or not?

 

During the operation of the heating system, the stamping on the regulating bolt must point at

“Z” (Z = closed) for the heating system to be closed or activated. For filling, draining and venting the heating system, the stamping must point at A (A = open) for the check valve to be open or not activated.