Mega Flow Problem

[bennboywsm]

Hi All

Just want to say what a good forum this is!

Im having a problem with my MEGAFLOW, its not keeping the hot water HOT for long enough, we have not pressure in the red celinder at the top. The heating works fine but its just the hot water is on for an hour and only lasts for one bath / shower.

Its is a MEGAFLOW, heatrae sadia, 18 months old, unvented - any help would be great.

Thanks Ben

 

[lagunaglen]

Can you give us more details,is the system pressure low,is megaflow upstairs and boiler downstairs for instance?

 

[bennboywsm]

Thanks

The megaflow is upstairs and boiler downstairs.

system pressure is at 64 degrees.

Hope that helps.

Ben

 

[sooey]

What size cylinder is it?

 

[bennboywsm]

145

 

[lagunaglen]

I think you just have a low pressure problem here,somewhere on the boiler or system there is a pressure gauge ,this should read approx 1 bar when cold and 2 bar when hot.
you need to check the pressure and then check the flow and return pipework going to the cylinder.
There should be somewhere to bleed the pipe to get water back into the system.

Ideally there should be an auto air vent at highest point of system but if not a manual air vent you can open with a rad key or screwdriver.

 

[bennboywsm]

Thanks, not sure what im looking for thou...

Ive uploaded some photos...

http://www.ben-smith.net/boiler/photo.jpg

http://www.ben-smith.net/boiler/photo-1.jpg

Cant see anywhere to bleed it thou?

 

[sooey]

I can't see what the system pressure's got to do with it, as long as it's high enough for the boiler to work. But a 145 litre cylinder won't give much more than a good hot bath, it's designed to reheat in twenty mins or so though.

 

[spacethegas]

difficult to make out. but it looks like the sealed system pressure is on 0.

turn the black knob in the picture on until the gauge reads 1.5 bar.

 

[bennboywsm]

tried everything but nothing happens?