Recent content by Doug0205

  1. Doug0205

    Unvented Megaflo Cylinder (Solar), why does it have an expansion vessel?

    Yeah, it's a newish double piston bicycle pump with max pump of 4bar roundabouts. Will not be using one of those again to do this as nearly broke my ribs. I'll have to try with another one. These pics should have relevant info. Cheers
  2. Doug0205

    Unvented Megaflo Cylinder (Solar), why does it have an expansion vessel?

    Quick update; Drained the main cylinder then waited for the EV to drain, although ended up pushing Schrader valve in which sped everything up. Must have still been an air pocket inside that got released when it drained a little? Ominous. The system is cold and empty, more or less. Tried...
  3. Doug0205

    Unvented Megaflo Cylinder (Solar), why does it have an expansion vessel?

    It's quite stiff with the bike pump (foot). Decided to drain the system and do a reboot, as it were. As above, decided to a "reboot" and drain cylinder, try and recharge EV, then refill and get a service before it all goes back on. Got a feeling the EV might be bust, but who knows.
  4. Doug0205

    Unvented Megaflo Cylinder (Solar), why does it have an expansion vessel?

    Yes, there is a grey cylinder on the side. I've plugged a bike pump in and the thing is totally flat. I did tentatively give the pump a squeeze to see what would happen, and sure enough, water came out the hot tap in the kitchen. Yes, that's my cylinder cupboard. I've just recharged the air...
  5. Doug0205

    Unvented Megaflo Cylinder (Solar), why does it have an expansion vessel?

    Hi, Thanks for responding. The room is upstairs. The procedure I went through went as follows: turned off mains water to it, opened up hot tap in kitchen downstairs and let drain fully, turned the PRV (the blue dial located at top of cylinder with pipe running to it) anti clockwise; first time...
  6. Doug0205

    Unvented Megaflo Cylinder (Solar), why does it have an expansion vessel?

    Ah okay, so the expansion vessel isn't just some backup or anything. It definitely needs to be pressurised.
  7. Doug0205

    Unvented Megaflo Cylinder (Solar), why does it have an expansion vessel?

    Have a fairly old (2007) Megatech Solar unvented system that has worked fine since I've been here. However, the tundish was leaking (for how long I'm not sure), so I repressurized the air gap, which didn't solve it as it dripped with frequency shortly after turning the heating back on. There is...
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