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Discuss Unable to get air lock out of Hot water system? Please help! in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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tomspenny

Hello just wondering if any of you can help me, I’ve fit a drain off and double check valve on the CW mains at the base of a twin immersion heater I’ve refilled the cyclinder and unable to get any hot water, I’ve tried the hose pipe trick for 2 hours and still no luck l, also tried turning the cold water taps off and slowly on again while flushing the toilet and still not luck, can anyone give any advice please ?
 

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T

tomspenny

Take the check valve off again, why did you fit it
Had a legionella risk assessment done and they wanted a back flow prevention valve installed on the CW Mains coming into the cylinder.
 
snowhead

snowhead

Esteemed
Plumber
Are you only getting cold water out of the Hot tap or no water at all?

Is the pipe you've put the check valve on definitely Mains cold and was it a spring type Check valve?

As above post if in doubt, remove what you've done and start again.
 
J

John.g

Check valve right way round?, a bit surprising that a hose, if connected to the drain wont force the air out, I cleared a neighbours recently by keeping the outlet nozzle blocked and opening the mixing valve "1/2 way" but you have probably tried all these methods.
 
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tomspenny

Hi guys I’ve now removed the check valve and started from where I begun and still no luck, tried every method I know of flushing out air locks. It has a secondary return with a gate valve and the flow has no gate valve. Any help at all would be much appreciated.
 
J

John.g

Crack open/remove the secondary flow & return and check for water, then remove the hot water top fitting and check for water. Are the electric immersions the only form of heating, just wondering if the flow/return are to a coil for oil/gas heating.
 
B

Ben-gee

Esteemed
Plumber
Isn’t that a vented cylinder, filled by gravity from a cold water storage tank?
 
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T

tomspenny

Yes it is a vented cyclinder filled by gravity from a cold water storage tank, I think the air lock is on the secondary return going to install a gate valve on the flow and try pull it through through the return. Thanks for your replying everyone much appreciated.
 
J

John.g

By "flow"if you mean the hot water outlet on top of the cylinder why don't you just remove it and see if water comes out the top of the cylinder?
 
B

Ben-gee

Esteemed
Plumber
Didn’t you say you put a check valve on the cylinder inlet? There may not be enough pressure from the tank to open this valve, it is not needed anyway.

just seen you removed it now.
 

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