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Two Zone Central heating system. Should both be able to heat at the same time?

  • 26-07-2011 11:15am
    #1
    Registered Users, Registered Users 2 Posts: 764 ✭✭✭


    Folks,
    I just got my oil fired central heating system converted to a two zone system with one zone being the hot water cylinder. Both zones now work fine independently (testing using boost) but if i put both zones on boost at the same time the radiators seem to be overiding the hot water zone which only seems to heat properly (i.e. the inlet and outlet pipes to the coil fully heating) when the radiator zone is switched off. My question is should they not heat together if both are switched on? Thanks.


Comments

  • Registered Users, Registered Users 2 Posts: 1,257 ✭✭✭Pete67


    All zones should be capable of operating together if the system is balanced properly. Look for a gate valve on the return from the cylinder coil and open it slightly. If you open it too much the radiators will not heat when the hot water is on. A bit of trial and error is required to get it balanced right.


  • Registered Users, Registered Users 2 Posts: 1,632 ✭✭✭heinbloed


    Ask the installer for the control manual.
    Usually the space heating has a different demand on the boiler temperature than the domestic hot water.
    In a modern home/space heating system the flow temperature can be reduced to 40-50 degrees. With surface heating down to 25 degrees.

    The domestic hot water should (depending on the installation !) boost to about 60 degrees Celsius once per day. This boost might not be necessary, it really depends on the installation and the quality of the water.

    So with the described situation the CH circuit works on a seperate, lower temperature than the DHW circuit.
    Nothing to worry about, an intelligent solution.

    The temperature of the CH circuit might differ between winter and summer, the extra thermal losses of the structure have to be caught up with an extra thermal input.
    There might be a weather compensation unit installed for this purpose,working automatically. The colder it gets outside the higher the CH temperature will get.A manual adjustment of the CH temperature should be possible as well.

    Again: get the manual, it will tell you how to get the most out of your installation.


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