Gravity hot water not circulating please help

[gasmannn]

I had a problem with no hot water on a gravity circulation system, I thought the coil was blocked as it was getting hot to one side, so I changed the cylinder, still didn't work, I then found a two port valve boxed in and the head was gone so I replaced, started to fire but still hot to only one side of the coil, tried back filling through the boiler drain off got some heat round the return while filling with boiler running but once I stopped and tried running it again still won't circulate????

 

[Best]

The return fitted ok but the flow was a bit higher so I just dropped it with a straight connector no elbows or bends

As long as the pipes weren't able to drop down, then you did nothing wrong there. I would have had the flow above the coil & dropped down as someone has said, but it should still work. If you are sure no airlock in pipes then looks like you have an unsuitable cylinder.

 

[gasmannn]

Trouble is I spent 300 on the other cylinder it's a 1600x 450 looks like I'll have to bite the bullet

 

[Best]

you can still buy cylinder with gravity coils from most merchants, its what they use on solid fuel installs. grade 1" gravity coil cylinders, prob cost abit tho.

I think they just use a 28mm coil that is pulled out a bit more. Hopefully not dear.

 

[gasmannn]

As long as the pipes weren't able to drop down, then you did nothing wrong there. I would have had the flow above the coil & dropped down as someone has said, but it should still work. If you are sure no airlock in pipes then looks like you have an unsuitable cylinder.

Do you think I should try and raise the flow? Is this to give it more gravity to push round and how high do I need to raise it? It is level at the minute

 

[nicro3]

Is there cytrol valve on return.

 

[gasmannn]

No just a compression elbow of the cylinder

 

[Best]

Do you think I should try and raise the flow? Is this to give it more gravity to push round and how high do I need to raise it? It is level at the minute

No, don't bother, - it should still have worked if straight in.
The extra vertical height on a flow helps it to gravitate & also makes it easy to connect to a coil & easy to change to new cylinder with different height of coil & easy to solder the tee as it is above the side of cyl.

 

[Best]

Just had a thought about how to confirm if the coil is the problem, or not.
This may not be easy, but if you could have disconnected the flow & return from cyl coil & joined them together & tried the boiler to see if the gravity pipes circulate.

 

[snowhead]

Just to remind everyone, he had no flow thro' the old cylinder before he changed to the new one.

It's got to be a problem in the flow or return.

You need to drain and check the 2 port valve is definitely clear and this in the flow is not restricting the flow.
It may be hot both sides but you may not have a good flow;

On the flow there is some type of fitting that is compression that has a cap on and feels like there is a spring in it,but the pipe gets hot above and below this??I don't know wat it is someone said it is an old pressure relief is this true?

 

[gasmannn]

Just to remind everyone, he had no flow thro' the old cylinder before he changed to the new one.

It's got to be a problem in the flow or return.

I had no flow through the return but i didn't find out till after I had changed everything there was a two port valve that had been boxed in a rediculous place and the head was faulty so I think this was the problem all along a not a blockage as I was advised so i now realise that I fitted the new cylinder for no reason and have now made more problems by changing it

 

[tamz]

Gasmann your either a retard or a wind up merchant. Either way better than the rubbish on the telly :wink:

 

[gasmannn]

Gasmann your either a retard or a wind up merchant. Either way better than the rubbish on the telly :wink:

Come up with a solution then clever clogs if not take your smart comments somewhere else! If asking for help makes me a retard then I am you cocky

 

[tamz]

A wean wi a biscuit bum could figure that one out lol

 

[sweet]

Gasmann your either a retard or a wind up merchant. Either way better than the rubbish on the telly :wink:

Tamz you wouldn't say that to his face so don't say it on here. Gasmann is only trying to get a heads up to a problem that he hasn't encountered before & being a youngster he's may never have had a problem with a semi-gravity system but he's going to learn a lot with this one and surely that's what is all about...

 

[tamz]

Tamz you wouldn't say that to his face so don't say it on here.

Would you like a bet on that?

 

[gasmannn]

Would you like a bet on that?

Lets see if your as clever as you think you are and tell me what I have not tried?

 

[REDSAW]

Behave!!!

 

[gasmannn]

Didn't think so tamz you think you talk a good game but can't come up with the solution

 

[tamz]

Lets see if your as clever as you think you are and tell me what I have not tried?

You'll never learn if someone tells you the answers.
You've already written in one of your posts (i can't be bothered to look which one) what is wrong with it. That is the only clue i'll give you.
Figure it out for yourself or pay another tradesman for your education.

 

[tamz]

Btw this is first year apprentice stuff. Basic principles of plumbing. Think about it.

 

[gasmannn]

You'll never learn if someone tells you the answers.
You've already written in one of your posts (i can't be bothered to look which one) what is wrong with it. That is the only clue i'll give you.
Figure it out for yourself or pay another tradesman for your education.

Why you so sour mate did someone not teach you what you know I can't understand people like you if you don't wana help someone out then why come on here just to take the mick, and if it the fact I chose the wrong cylinder I was advised on this and older plumbers have told me it shouldn't matter

 

[tamz]

There is nothing wrong with the cylinder.

 

[gasmannn]

There is nothing wrong with the cylinder.

What else can be restricting it? The valve is opening there's no restriction there? Is it because the flow to the coil is level? It was on the old one. It might be basic for you but I have struggled for days Ive called everyone I know people just keep telling me the same stuff, if you can help me I would appreciate it if not then don't worry about it

 

[sweet]

Why you so sour mate did someone not teach you what you know I can't understand people like you if you don't wana help someone out then why come on here just to take the mick, and if it the fact I chose the wrong cylinder I was advised on this and older plumbers have told me it shouldn't matter

have you tried bypassing the cylinder yet to rule out blockage or seized zone valve?

 

[gasmannn]

have you tried bypassing the cylinder yet to rule out blockage or seized zone valve?

Bypassing the cylinder was going to be the next step, as for the valve when I back filled it I had the boiler running and it pushed hot water up the return to the coil budding seem to go back round the flow? I don't think tamz really knows what the problem is at all To be honest

 

[sweet]

Keep us all updated with the outcome. It's great when posters do this as this helps others...

 

[gasmannn]

Wil do thanks

 

[tamz]

I don't think tamz really knows what the problem is at all To be honest

Your right. I don't but my apprentice does. I'll ask him in the morning and get back to you with a price :lol:

 

[gasmannn]

Your right. I don't but my apprentice does. I'll ask him in the morning and get back to you with a price :lol:

Go back to your single bed on your mums house you sad little man

 

[tamz]

And you keep scratching your head.
When you eventually figure it out you'll never forget it so will have learned a lesson to last a lifetime.
If you want to be half clued up in heating this is simple stuff. Think!

 

[kay-jay]

Lmao great thread this lol.

Btw op tamz has forgotten more than you'll ever know.

P.s my Labrador pup is laughing his sack off here. He figured it out ....

Sent from my GT-I9100 using Tapatalk 2

 

[nadia69]

Wil do thanks

what connections did you use on the cylinder if they were iron to coppers 1 inch make sure you have not tightened the fittings to much to cause the coil inside to face upwards causing an air lock or twist in any way, its worth looking inside the imersion heater hole

 

[Orry Clayton]

With amount it is costing him he could have ripped it all out and fitted a decent combi or unvented system...

Draw a schematic of the system, and load up on here... Can't seem to picture it in my head what you have.
From boiler to cylinder, valves, pumps, and the different levels they are on...

 

[on31ll]

hmmmm i cant seem to picture it either to figure out the problem. following this one

 

[gasmannn]

Thanks everybody that tried to help me and for all the advice, I made the flow to the coil about four inches higher than level. Once I filled up again this still didnt do anything, I called the manufacturer and asked if I needed a special cylinder they said I do cus the coil is not stretched for gravity and that's why it wasn't working. I was preparing myself to lay out for a new cylinder. I left the job and got a call a few hours later and they had hot water I couldn't believe it and now it's been a few days and had no call backs. It can only of been air and the restriction of the coil and eventually it just started circulating. I might not of made any money but I learnt a lot from this job, and if I go to gravity next time I will hopefully know the install as I think between us all we covered every problem that could exist on this system lol thank you all once again that was my first post and nice to know so many people are happy to help out