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  #1  
Old 20-01-2009, 01:47 PM
suicra05 suicra05 is offline
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Default air trapped in radiator

I recently replaced an old radiator in a bedroom with a brand new radiator. This new radiator is causing problems as it is constantly getting airlocked. I have taken the air out on numerous occasions using a key. A few days later there is air in it again. When the air is in it there is very little heat from the radiator. Can anybody offer me any solutions. It has happened about ten times now over past few weeks.
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  #2  
Old 20-01-2009, 01:48 PM
Conshine Conshine is offline
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Default Re: air trapped in radiator

Did you do it when the radiator was on? If you do it when it is off, there will be no pressure, so the airlock wont be cleared.
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  #3  
Old 20-01-2009, 01:53 PM
suicra05 suicra05 is offline
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Default Re: air trapped in radiator

I always do it when the radiator is on.
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  #4  
Old 20-01-2009, 04:13 PM
DavyJones DavyJones is offline
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Default Re: air trapped in radiator

This is a symtom of a system fault. If you have a vented system (small tank in attic feeding radiators) it may be pitching. This is a term used to describe hot water expanding up the expansion pipe and pouring into tank. This causes air to enter system as it refills. The problem rad may be the last on the circuit and the air gets pumped back to it. Pitching should be easy to fix.

If you have a sealed system or indeed a vented system, the air may be caused by a leak. IF you have a sealed system your pressure will drop. A vented/unsealed system refills itself. Tie up the ballcock feeding small tank in attic to prevent it filling itself. Note water level in tank and leave for a few days, if level drops, then you can safely assume you have a leak.
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  #5  
Old 20-01-2009, 04:22 PM
suicra05 suicra05 is offline
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Default Re: air trapped in radiator

If it is scenario 1 as you say Pitching. How do I fix Pitching as I think it is the last radiator in the circuit.
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  #6  
Old 20-01-2009, 04:34 PM
DavyJones DavyJones is offline
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Default Re: air trapped in radiator

Quote:
Originally Posted by suicra05 View Post
If it is scenario 1 as you say Pitching. How do I fix Pitching as I think it is the last radiator in the circuit.

I may have to give you a crash course in heating .

Have you changed circulating pump recently?

There are three settings on pump, high, middle, low. Check these settings.

go to attic when system has been running for a few hours, check small tank. you will see the expansion pipe, it rises over tank and bends into it. Place a finger in this pipe and see if it is wet, it will confirm or discount pitching.
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  #7  
Old 20-01-2009, 05:27 PM
noelf noelf is offline
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Default Re: air trapped in radiator

I agree with davies advice, but I think its more than pitching.
Why did you have to repalce a rad?
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  #8  
Old 21-01-2009, 07:46 AM
JBS
 
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Default Re: air trapped in radiator

[quote=DavyJones;786329]I may have to give you a crash course in heating .

Will non return valve on expansion pipe help?
Why this expansion happens anyway?
If this is a seald system, will leakage sealant help?
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  #9  
Old 21-01-2009, 09:06 AM
theengineer theengineer is offline
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Default Re: air trapped in radiator

may i ask, did you have this problem before you changed the radiator? did the old one work ok?
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  #10  
Old 21-01-2009, 09:18 AM
noelf noelf is offline
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Default Re: air trapped in radiator

[quote=JBS;786690]
Quote:
Originally Posted by DavyJones View Post
I may have to give you a crash course in heating .

Will non return valve on expansion pipe help?
Why this expansion happens anyway?
If this is a seald system, will leakage sealant help?
The expansion pipe must remain unemcumbered, never fit a valve of any sort to the expansion pipe
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  #11  
Old 21-01-2009, 09:40 AM
DavyJones DavyJones is offline
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Default Re: air trapped in radiator

[quote=JBS;786690]
Quote:
Originally Posted by DavyJones View Post
I may have to give you a crash course in heating .

Will non return valve on expansion pipe help?
Why this expansion happens anyway?
If this is a seald system, will leakage sealant help?
As mentioned already, no valves to be fitted on expansion pipe.

Position of pump is important, pump may be driving water up expansion. Stats may be faulty meaning water is heating too much. It's more than likely a system design fault.

Leak sealant is hit and miss. Worth a shot before you start digging up floors.

I doubt very much that this has anything to do with the radiator. A radiator can only leak or get blocked.
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