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Landis Gyr ZAV 222 Zone Valve - 'Open' and 'Man' lever

  • 28-03-2016 4:32pm
    #1
    redt0m
    Registered Users, Registered Users 2 Posts: 346 ✭✭


    Hi, hoping someone can help. I've inherited a 20 year old central heating system with a Landis & Gyr ZAV-222 zone valve which I'm trying to figure out as it may be wonky. The heating has been working upstairs and down OK over the winter, but the last couple of nights 2 out of the 3 downstairs radiators weren't getting any heat. I bled the 2 radiators and then checked the pump and zone valve. Pump seems to be OK, but I'm confused by the 'Open' and 'Man' lever on the valve. The lever feels loose, but maybe they're supposed to be like that, I don't know. The lever has always sat near the 'Open' setting but it would not be right on it, always sort of sitting near halfway too. I pushed the lever to 'Open' and the heat resumed downstairs - should I have done that? Or should the lever always be in the 'Man' position?

    Just wondering if this is an immediate indicator that the zone valve has reached end of life and needs replacing, or if I am ignorant of something else that might explain the heat interruption downstairs. When I moved in, I had a plumber service the boiler and pump and he was happy that it was all working OK.

    Any pointers welcome.


Comments

  • #2
    redt0m
    Registered Users, Registered Users 2 Posts: 346 ✭✭redt0m


    Anyone?


  • #3
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,881 ✭✭✭✭Calahonda52


    The manual option is there so as you can manually open the valve and keep it open as the spring loaded valve is closed by default.
    You should be able to press the lever lever down, or up, into a little notch to hold it open against the spring.

    Under normal operations the lever will not go all the way over to open. They are normally a bit floppy/loose

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  • #4
    redt0m
    Registered Users, Registered Users 2 Posts: 346 ✭✭redt0m


    Thanks for that. So if I am understanding correctly, if the lever is over at the 'Man' position, the valve is closed?

    I think it'll probably have to be replaced anyway as the notch to hold the lever in the 'Open' position can't seem to hold the lever - the lever keeps popping back out.


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