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  1. F

    Installing Evohome thermostat to Greenstore cyclinder

    Can you post a picture of the 2 dry pockets?
  2. F

    Variable speed pump question.

    Worth having a read of this: http://www.newtonnet.co.uk/permanent/GrundfosDocs/BypassCommissioningAlpha2or2L.pdf ABV's and variable speed pumps can work against one another.
  3. F

    Fernox Tf1 total filter reversed flow

    I've had many RGI's over the years (including 3 for work in the last 5 years) - I've yet to meet one that deburrs the pipes! To be fair to them, it is time consuming and they are probably usually employed based on the price they give, so deburring would add to their time and cost. However, it...
  4. F

    Adjusting the PRV to go to 4 bar..?

    I'm surprised by some of the responses relating to pressure and flow rate. The pipe diameter and length determine the pressure loss in the pipe run. If you have a longer pipe (you can try this with a garden hose reel), the pressure loss will be greater and you will get less flow at the end. If...
  5. F

    Unvented Cylinder Expansion Vessel - advice sought

    Depends on the pre-charge on the vessel. It should be set to whatever your incoming mains supply is reduced to (and this in turn should be set to whatever your cylinder manufacturer has stated). The idea is that no water enters the expansion vessel at normal reduced mains pressure. Only when...
  6. F

    Unvented Cylinder Expansion Vessel - advice sought

    Is the red vessel definitely connected to your mains water supply and not to your central heating system? If so, it should still function to take up the expansion of hot water - so the fact your Pressure Relief Valve is opening suggests it is either defective or has not been charged correctly...
  7. F

    Where to connect an ABV

    A boiler can only modulate down to its minimum (found in the manual). In the case of your cylinder, if the boiler temp is not high enough to raise the temp of the cylinder any longer, the return temp slowly creeps up until it gets close to the flow temp. This means very little heat is being...
  8. F

    Where to connect an ABV

    Are you sure your boiler is set to a sufficiently high temperature to allow your cylinder to satisfy the stat? If your cylinder is set to 60, your boiler should be set at least 10 degrees higher than that (maybe slightly more - otherwise the boiler will short cycle as the cylinder approaches...
  9. F

    Three tee rule and bypass

    I'm sure others will chime in, but this thread explains it all very well (including the ABV, which is the last return): The last tee
  10. F

    CH not getting to temp like it used to.

    The drayton wiser system should adjust the flow temp using opentherm depending on the delta T between the room and thermostat. With Evohome, for example, if the delta T exceeds a few degrees, the flow temp is set to MAX. I don't know enough about your boiler or wiser to advise further, but it's...
  11. F

    Vaillant 630 bypass question

    It seems to be that with some boiler's (eg. large KW output Vaillant's with high resistance heat exchangers and software which requires high flow rates before the boiler has a chance to modulate down), many domestic installers are using/relying on an ABV to overcome the problem of insufficient...
  12. F

    Conflicting Advice, help please

    Only for as long as it takes the cylinder to heat up. I assume it's an unvented cylinder with a coil that size, which usually have a re-heat time of around 30 mins. Most systems are setup as HW priority so that the cylinder gets all (or most) of the heat from the boiler to heat it up as quickly...
  13. F

    Auto bypass always open - help!

    Indeed: http://www.newtonnet.co.uk/permanent/GrundfosDocs/BypassCommissioningAlpha2or2L.pdf A fixed bypass is a manually adjusted valve which is set to give the required bypass flow. It could be a simple valve, but Grundfos recommends the use of the Taco Nova Setter valve with flow gauge.
  14. F

    Gas central heating vs oil radiators

    Presumably, the heating thermostat is set at 14 degrees at 6:10pm, but the house is a nice toasty 22 degrees and slowly cools down. I agree with others, though, that you should just keep the heating on until 9pm or so, and the house should still be warm for a good few hours after that until you...
  15. F

    Customer claiming against you after 6 years!

    A compression fitting failing after 6 years will be very difficult to prove. I would say the letter is speculative, at best, and probably hoping you will settle with them before it goes any further. Engaging a solicitor is the best course of action, but you may be better off waiting to see if...
  16. F

    Impluse Novice Purchase - Did I Buy The Right/Best Filter?

    One of the reasons I chose the Omega is there is no need to remove the magnet or isolate the valves either side of it. It can simply be flushed out in-situ. My previous experience with a BoilerMag was that the valves supplied with magnetic filters should be touched as little as possible, as...
  17. F

    Single or Double check NRV

    Yes, the Pressure Reducing Valve is "drop tight" - certainly, the incoming pressure never exceeds 3 bar on the gauge, even though my mains pressure fluctuates between 5 to 7 bar. It sounds like, though, from what Shaun said above, that the NRV does not stop the pressure increase on the megaflo...
  18. F

    Single or Double check NRV

    Thank you for that. The reason I am asking this is in my unvented setup I have: Cold Water Main -> Pressure Reducing Valve (3 bar) -> NRV -> Pressure Relief Valve (8 bar) -> Megaflo inlet. I'm finding every 3-6 months I need to recharge my Megaflo air bubble. Whether this is right or not is a...
  19. F

    Single or Double check NRV

    I get that. But I want to understand how it works in relation to an unvented setup. The NRV is after the balanced cold to prevent hot water expansion to the cold outlets. I wanted to understand if this is how an NRV works - does it stop not just backflow but pressure build up also?
  20. F

    Single or Double check NRV

    I understand the physical difference between the two, but wanted to know in the context of plumbing and heating, when is one used vs the other? Also, in terms of pressure differential, would either stop a buildup of pressure on one side resulting in an increase in pressure the other side?

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