PRINCIPLE OF OPERATION (.continued) FlowCon By-Pass Assembly supports flushing procedure according to BSRIA BG29/2021. FORWARD FLUSHING OPERATION: Option 1. During flushing the system can be forward flushed through the supply-pipe strainer blowdown valve. Option 2 - Forward Flushing through Coil. Optionally, the return-side FlowCon AB-housing plug may be fitted with a combi p/t drain valve and allow forward flushing of the FCU as well. BACK FLUSHING OPERATION: Option 1. When system back-flushing , the bypass is opened and the system can be back-flushed unrestricted through the strainer blowdown valve. Option 2 - Back Flushing through Coil. As an alternative back-flushing procedure , the bypass is closed and the system can be back-flushed through PICV and FCU. It is re- commended to set PICV setting to 5.0 to allow as much opening as possible. Alternatively, the PICV insert may be removed from valve housing and replaced with a flushing cap allowing unrestricted back-flushing though PICV housing, FCU and strainer blowdown valve. Tech note · FlowCon By-Pass Assembly DN25-32 · march 2025 · www.flowcon.com Page 3 of 12
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