air lock in hot water cylinder coil?

[leertodd]

Hi all. Ive had to replace the pump isolator valves as they were leaking. All done and working but struggling to get air out. Rads are all good but when the boiler starts and stops there is odd sounds but mainly coming from inside the HW tank, sounds like water falling so im guessing air in the coil. There is what i think is an air valve near the 3 way valve but i dont get air or water from it. will attach image when i work out how. Any help appreciated.

 

[leertodd]

Only way i can find to share them

 

[John.g]

Can you slacken the compression nut about a half turn or so on the HW cylinder coil where it enters the cylinder, then pull back on the pipe until air/water comes out, re tighten compression nut.

 

[ShaunCorbs]

Highly unlikely the coil isn’t full does the hot water heat eg do you have hot water ?

 

[leertodd]

Highly unlikely the coil isn’t full does the hot water heat eg do you have hot water ?

I do have hot water. if you put ear on tank you can hear water running/falling type of sound. theres also for want of a better word a wooshing kind of sound when the pump starts. Is that bit on the end of the pipe near the 3 way an air release?

 

[Deleted member 120897]

When are you trying to open the air vent? Did you bleed the pump?

 

[leertodd]

When are you trying to open the air vent? Did you bleed the pump?

Ive tried the vent with system off and when its on. Yes ive done the pump and air came out at first. On start when its been off for a bit the sounds im hearing make me think air at pump but ive checked again and just water.

 

[Robooo]

Can you tell the make and model of the cylinder? It might have a manual online and it has troubleshooting in it.

 

[Deleted member 120897]

It might have a manual online and it has troubleshooting in it.

For a cylinder?

 

[Gasmk1]

The reason why you don’t get air or water from it is that people tighten them too much and the rubber washer gets pushed into the the air outlet opening so in essence it’s blocked if you take it off you will see a hole in the washer and the air hole is blocked. You can unblock it but you need to be quick as the air will escape then water. Has happened a few time to me over the years theses being blocked

 

[leertodd]

The reason why you don’t get air or water from it is that people tighten them too much and the rubber washer gets pushed into the the air outlet opening so in essence it’s blocked if you take it off you will see a hole in the washer and the air hole is blocked. You can unblock it but you need to be quick as the air will escape then water. Has happened a few time to me over the years theses being blocked

ive just taken the top off and as you can hopefully see in the image it looks like rubber in the hole. The cap has a rubber washer in the top with what looks like was a centre bit thats missing and im guessing thats what in the hole now. should the hole just be open as in nothing inside? if thats correct is it just a case of prising that bit out and should get air/water?

 

[leertodd]

ive just taken the top off and as you can hopefully see in the image it looks like rubber in the hole. The cap has a rubber washer in the top with what looks like was a centre bit thats missing and im guessing thats what in the hole now. should the hole just be open as in nothing inside? if thats correct is it just a case of prising that bit out and should get air/water?

The reason why you don’t get air or water from it is that people tighten them too much and the rubber washer gets pushed into the the air outlet opening so in essence it’s blocked if you take it off you will see a hole in the washer and the air hole is blocked. You can unblock it but you need to be quick as the air will escape then water. Has happened a few time to me over the years theses being blocked

should of also asked what it the correct name for this part incase I need a new cap

 

[Robooo]

For a cylinder?

That's what I was thinking.

 

[ShaunCorbs]

I do have hot water. if you put ear on tank you can hear water running/falling type of sound. theres also for want of a better word a wooshing kind of sound when the pump starts. Is that bit on the end of the pipe near the 3 way an air release?

Yes it’s an air vent

You sure your not hearing flow noise turn the pump down does it still happen

Might be Because the pump valves are full flow where as before they were restricted ?

 

[ShaunCorbs]

ive just taken the top off and as you can hopefully see in the image it looks like rubber in the hole. The cap has a rubber washer in the top with what looks like was a centre bit thats missing and im guessing thats what in the hole now. should the hole just be open as in nothing inside? if thats correct is it just a case of prising that bit out and should get air/water?

Yes do it with the system cold and poke something down there with a towel below and cap in hand ready to put it on once uou
Hear air escaping

 

[leertodd]

Yes it’s an air vent

You sure your not hearing flow noise turn the pump down does it still happen

Might be Because the pump valves are full flow where as before they were restricted ?

Im 99% sure its not the pump sound. just heard that sound of air/water moving at the boiler. will give it a poke later once cooled down. The pump valves were fully open before so put new in the same