I am on a job at the moment where the plumber has installed a combi boiler to work in conjunction with 2 2port valves and water cylinder to maintain hot water to 2nd bathroom, does anyone know if this common practice and how could it be externally wired to incorporate the combi boiler.
It's a reasonable design.
Unless you have a very large combi boiler, it will not be adequate to deliver the requirements of two bathrooms used simultaneously.
Having the cylinder arrangement effectively means that the heating section of the boiler is being used exactly as a non-combi would be. Thus, any of the conventional wiring arrangements like the Honeywell S plan or extended S plan can be used.
The HW part of the combi then feeds the first bathroom and perhaps other services. That operates pretty much stand alone to the heating part.
All that will happen is that if HW is used in the first bathroom, the boiler will switch to combi mode automatically and deliver that water, and will not be delivering heat to the CH or the HW cylinder during that time. This is OK because the cylinder will have HW stored for the second bathroom.
.andy
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On 2 Jun 2004 13:33:35 -0700, snipped-for-privacy@aol.com (marcus) strung together this:
It's basically an S plan. The exact wiring depends on whether the combi has a built in clock or not but in short there wants to be a feed to the 'call' terminal on the boiler via the appropriate stats and clocks external to the boiler.
Sounds good to me. At least he has the skills and knowledge necessary to realise that such an arrangement would be required!!
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