Bypass Valves. When demand from all the zones in an S-plan system has ceased and the zone valves have closed the boiler may still need to run on for a while to dissipate heat in its heat exchanger. In this case it is necessary to fit a bypass valve directly between the flow and return, before the zone valves.. Both the feed and return pipes are connectable via a pressure relief valve or automatic bypass valve, which allows the pump to carry boiler water even if all home radiators have been turned off for a period. Whilst the diagram shows four radiators, standard feed and return pipe system installations can accommodate up to 12 heating devices.

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1 Apr 2020. #1. I have almost finished my upgrade to my central heating. i.e. all new radiators, new pipes etc. The combi boilers built in bypass is set to maximum at .35bar. The existing system is a Valiant ecotec plus with 22mm used for about 1/4 the run and the rest are 15mm, 6 rads for 10KW. I was going to fit a bypass valve in a accessible.. Honeywell wrote: Bypass - An automatic bypass valve. should be fitted to prevent any. increase in pressure within the system. Even though there is always one valve. outlet open: the bypass will guard. against the possibility of the heating. circuit being isolated by the radiator. thermostats or manual operation of the.