Hi,
Please forgive my lack of knowledge here! I have an Evohome retrofitted to my Y-plan system, however am now looking a changing a few things around and I read through these forums the "figure 4" installation is considered optimum - that is the heating circuit always on (though flow restricted by every radiator having a Evohome valve with a single 2-way valve, thus definitely requires a bypass valve) and relay to introduce HW on demand.
My question is WHY is this optimal? Perhaps naively I would've thought the Y-plan setup with the 3-way value would be better as at any given time the system can provide heating OR hot water OR heating and hot water.
The only obvious advantage I can see is within the Evohome software: for whatever reason when setting up as Y-plan the configuration options to set boiler cycle and run times are not available, this despite the fact the Evohome still has exclusive control over the boiler (even in setups like mine which incorporate pump overrun it still has exclusive control over demand).. I don't see why this 'logic' / 'limits' cannot be used for Y-plan setups (eg. don't cycle boiler more than x times an hour and don't run boiler for less than x minutes)?
Quite possibly missing something - maybe on both on the optimal pipework/valve setup AND a good reason why the above can't be configured for Y-plan - look forward to being educated!
Thanks.
Please forgive my lack of knowledge here! I have an Evohome retrofitted to my Y-plan system, however am now looking a changing a few things around and I read through these forums the "figure 4" installation is considered optimum - that is the heating circuit always on (though flow restricted by every radiator having a Evohome valve with a single 2-way valve, thus definitely requires a bypass valve) and relay to introduce HW on demand.
My question is WHY is this optimal? Perhaps naively I would've thought the Y-plan setup with the 3-way value would be better as at any given time the system can provide heating OR hot water OR heating and hot water.
The only obvious advantage I can see is within the Evohome software: for whatever reason when setting up as Y-plan the configuration options to set boiler cycle and run times are not available, this despite the fact the Evohome still has exclusive control over the boiler (even in setups like mine which incorporate pump overrun it still has exclusive control over demand).. I don't see why this 'logic' / 'limits' cannot be used for Y-plan setups (eg. don't cycle boiler more than x times an hour and don't run boiler for less than x minutes)?
Quite possibly missing something - maybe on both on the optimal pipework/valve setup AND a good reason why the above can't be configured for Y-plan - look forward to being educated!
Thanks.
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