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Upgrading semi gravity central heating system

  • 07-12-2019 03:12PM
    #1
    sparks24
    Registered Users, Registered Users 2 Posts: 260 ✭✭


    Hello,

    I'm after a bit of advice. I have a vented semi gravity central heating / hot water system that has no controls except the basic on / off and time switch. The boiler stat is all that fires the boiler. Hot water is a dangerously hot byproduct of the heating being on.

    Doing a bit of research i've decided to upgrade it to a c plan system. I will be installing a programmable thermostat, cylinder stat, normally open control valve on the return of the primaries just after the cylinder and trvs throughout the house except for the room with the programmable thermostat which is on the end of the central heating loop. This i believe negates the need for an automatic bypass valve? It's hard to find a definitive answer regarding semi gravity systems. I will install a lockshield valve on both sides of this radiator.

    The boiler is an oil burner firebird popular 90 /120 i don't know for sure the branding is all worn away. What i have found is that the cowboy that installed it has wired the central heating pump to a plug so basically runs 24/7 365 days a year which is a joke that i'm going to fix with an off delay timer to allow a bit of pump overrun. Hard to find some info on how long i should set this for as all the info online relates to low water volume gas systems and not this old type so any suggestions on how long or, if any pump over run is required would be much appreciated.

    Finally before i do a form of the above depending on some experienced advice i may get here, I intend to balance to secondary CH circuit but i'm not sure if i should balance to hot water primaries? Should i try to get a 11c differential between flow and return on the hot water primaries also?

    Any advice on the above would be great and thank you for your time.

    Kind regards,

    sparks24


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