Worcester Bosch 28cdi rsf diverter valve
- Thread starter pgriff.20
- Start date
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could be to do with flow rate or a bypass
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The MIs state that a restrictor is fitted to restrict the (DHW) flow to 10.0LPM (+or-15%) on the 28 CDI, don't know if this is supposed to be calibrated on commissioning but imagine it may be to ensure that the boiler gives its rated output which can then be calculated by measuring the DHW temp and the mains temp once the flow rate is known. DHW temp rise is normally specified at a 35C rise, in the 28CDI this will be at 11.5LPM, (10+15%), the temp rise at 8.5LPM, (10-15%) will be 47C and at 10LPM will be 40C.
Not an easy one to fit
Yep it's purely a flow restrictor as above absolute pain of a valve to change be prepared for leaks afterwards. Change the O rings especially on cold inlet and plenty of silicone grease. Cover pcb housing with cling film stop water getting to it
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