Pressure Drop

jtj · 18 Feb 2006

I have a Ravenheat RSF Combi Boiler about 6 years old and over the last few months I have experienced pressure drops which have got worse in spite of the radiators and hot water working perfectly.At present I am losing about half a bar daily and the pressure is about 3.2 bars when fully hot.I have disconnected the filler loop to see if there are any leaks but there appear to be none.Similarly I have checked the radiators and valves and again no visible leaks.Has anybody any ideas what I can do next.
Thanks.

croydoncorgi · 18 Feb 2006

What pressure is it when cold?
Over 3 Bar is FAR too high - it's no wonder you're 'losing pressure' - the PRV is opening to stop the thing going BANG!!!

Softus · 19 Feb 2006

jtj said:
...I have experienced pressure drops...

Please could you tell us the values that the pressure drops from and to, and over what period of time it happens?

jtj · 19 Feb 2006

croydoncorgi said:
What pressure is it when cold?
Over 3 Bar is FAR too high - it's no wonder you're 'losing pressure' - the PRV is opening to stop the thing going BANG!!!

Thanks for getting back to me so quickly.When the system cools down the pressure drops to 0.6 bar.I top it up to 1.1 bar and turn the heating on.the next morning it is back to approximately 0.6 bar.

jtj · 19 Feb 2006

Softus said:
jtj said:

...I have experienced pressure drops...

Click to expand...

Please could you tell us the values that the pressure drops from and to, and over what period of time it happens?

Thanks for getting back to me so promptly.The pressure drops to 0.6 bar when cold.I top it up to 1.1 bar before switching the heating on.The next morning its dropped to approximately 0.6 bar again.

fitz1 · 19 Feb 2006

look at pressure release pipe outside and see if any visible signs of water.i:e. water or water staines to brickwork or floor.

chrishutt · 19 Feb 2006

You obviously have a problem with the expansion vessel. It will need recharging or replacing. Lots of threads on this giving more detail, also look in FAQ topic.

jtj · 19 Feb 2006

fitz1 said:
look at pressure release pipe outside and see if any visible signs of water.i:e. water or water staines to brickwork or floor.

Thanks for getting back to me.I checked the pipe and there is dampness at the outlet.Not lots but every time I put my finger over the end it had a drop of water on it.

fitz1 · 19 Feb 2006

how many radiators on system

JPC · 19 Feb 2006

i'd go with the exp vessel also.

if i stops working it makes ur pressure yo yo...u fill it to say 1 bar...its heats up..has nowwhere to expand and goes up to 3 bar +...the prv works.

system then cools later one and pressure has dropped obviuosly as water has been discharged via the prv.

and so on....all day long

jtj · 19 Feb 2006

fitz1 said:
how many radiators on system

There are 9 altogether.

chrishutt · 20 Feb 2006

jtj, it's the expansion vessel!

jtj · 20 Feb 2006

chrishutt said:
jtj, it's the expansion vessel!

Thanks,
JTJ

jtj · 20 Feb 2006

JPC said:
i'd go with the exp vessel also.

if i stops working it makes ur pressure yo yo...u fill it to say 1 bar...its heats up..has nowwhere to expand and goes up to 3 bar +...the prv works.

system then cools later one and pressure has dropped obviuosly as water has been discharged via the prv.

and so on....all day long

Thanks,
JTJ

jtj · 20 Feb 2006

chrishutt said:
You obviously have a problem with the expansion vessel. It will need recharging or replacing. Lots of threads on this giving more detail, also look in FAQ topic.

Thanks,
JTJ

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Pressure Drop

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