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Hello Guys,

I just recently installed a ecotec plus 825 which is working fine. The customer is complaining about their only heat source which is ufh rehau.

The problem they experiencing is no heating. I have been out and investigated the works again. I have made sure the boiler is functioning fine as well as hot water so i can definitely say the boiler side of it is good.

The previous boiler was a very old baxi boiler which was connected onto the ufh in 15mm to the manifold. Customer has complained before that the ufh never worked properly and that someone came out and hard wired the ufh.

So, my problem is that whenever my boiler is running is pushes against the other manifold pump and in return it pushes back into the boiler flow. The boiler goes into the Burner anti-cycling time. It just indicates it does not get the heat away towards the ufh. the previous engineer took all the actuators off and the thermostat at the return side. i can see by pressing the pins that each zone is functioning and open. but somehow it seems like it never worked before. I obviously connected the flow to the flow side as it was before but i cannot seem to understand why it doesnt work.

Is it not better to take the pump of the manifold and let it run like a radiator?
I do not seem to understand the way they installed it. It could have never worked as the connections and piping is exactly the same as it was before.

It doesnt seem like to circulate. I always have to turn the pump at the manifold off otherwise it pushes back into the flow and the pipes gets really cold.

boiler installation.png
 
Hello Guys,

I just recently installed a ecotec plus 825 which is working fine. The customer is complaining about their only heat source which is ufh rehau.

The problem they experiencing is no heating. I have been out and investigated the works again. I have made sure the boiler is functioning fine as well as hot water so i can definitely say the boiler side of it is good.

The previous boiler was a very old baxi boiler which was connected onto the ufh in 15mm to the manifold. Customer has complained before that the ufh never worked properly and that someone came out and hard wired the ufh.

So, my problem is that whenever my boiler is running is pushes against the other manifold pump and in return it pushes back into the boiler flow. The boiler goes into the Burner anti-cycling time. It just indicates it does not get the heat away towards the ufh. the previous engineer took all the actuators off and the thermostat at the return side. i can see by pressing the pins that each zone is functioning and open. but somehow it seems like it never worked before. I obviously connected the flow to the flow side as it was before but i cannot seem to understand why it doesnt work.

Is it not better to take the pump of the manifold and let it run like a radiator?
I do not seem to understand the way they installed it. It could have never worked as the connections and piping is exactly the same as it was before.

It doesnt seem like to circulate. I always have to turn the pump at the manifold off otherwise it pushes back into the flow and the pipes gets really cold.

either they have mixed the flow and return when they installed it o i dont know how that has worked.

View attachment 35195
 
Close coupled tees before ufh pump
 
Close coupled tees before ufh pump
would that solve the issue? It seems like such a small bypass or hydraulic bypass would not make much difference.

unless you tell me that would work I would definitely give it a go.

could I do it right after the boiler as the boiler and ufh manifold sit in one room and the flow and return are very short runs.

i was thinking to install at the left hand side like in the picture above before the thermostat
 
just before the ufh manifold

will be better but not ideal as your heating load isnt that much due to only ufh
 
There is no other circuit then the ufh with 6 small zones. They only have the ufh as heat source so somehow I think there is a setup of the previous engineers not quite right.
 
Here are the old pictures of the old setup. I just connected onto the old pipework which is shown in the drawing I did. It is even written with a manufacturing sticker what flow and return is so I tripple checked that as well as the old system.

D52B1C21-A788-4724-8F6B-83A516724583.jpeg


B15290FC-F99C-4B31-A70F-7B09A042B1AC.jpeg


B5EA5B4F-B10F-42F9-9383-4A92353E89AB.png


92D6E928-168A-4BD7-94E4-36E0E8C14AE2.png


F2CAF1D4-B15E-4968-B916-8E411EDD94A5.png
 
Manifold is all wrong.
The pump set should be fitted to the isolation valves..
The other side should be blanked off.
Will never work and has never worked.
 
Manifold is all wrong.
The pump set should be fitted to the isolation valves..
The other side should be blanked off.
Will never work and has never worked.
Chalked, that’s what I was talking about.

Thanks for the confirmation...
I also did a mistake but perhaps that wouldn’t make any difference. I connected the manifold correctly NOW but the old install had the flow at the bottom .... so I did actually not connect the system as I put was but did it unconscious in the right way
 
Furthermore the Manifold has no isolation valves at all. It is basically just the pump on the right hand side, a temperature sensor, and a manometer.

Left hand side you can clearly see it’s just the thermostat and the valve above.


Could you perhaps tell me what you would do to make that working? Would you change the whole manifold and start from zero or just fixing it somehow? I am a little stuck as i do not know what to tel the customer.
 
Depends how the manufacturers spec it out seen them either way

IMG_3940.JPG
 
Perhaps it is my fault due to the old engineers swapping the flow with the return and I actually connected the manifold correct.

The pump arrow shows upwards into the flow which you can see at the drawing.

I would not mind to say that’s me who is at fault but I would have thought somone would install a Manifold to manufactures instructions like with common sense
 
You connected the sensor head right ? Fallen off In the pic
 
You connected the sensor head right ? Fallen off In the pic
My flow goes I to the top part which has a sticker and says flow. Return at the bottom BUT as far as I can see the old baxi was connected top return bottom flow.

Now, I would think if I’d go back and swap my pipes over even though it’s stilly it may work ?

Seems a little odd the whole setup to be fair. What does it mean when someone says he has hard wired the ufh ?
 
which is correct

return get too hot sensor shuts and re passes the return to the flow

im guessing hes wired something out

your problem is the cycling due to no heat load
 
which is correct

return get too hot sensor shuts and re passes the return to the flow

im guessing hes wired something out

your problem is the cycling due to no heat load
So you are saying I have to swap my pipes around? Are you saying the 2ay I have conntected it up is right? According to manufacturer yes. But why did the previous installers connect this the other way around?

So what would you just me to do?
 
So you are saying I have to swap my pipes around? Are you saying the 2ay I have conntected it up is right? According to manufacturer yes. But why did the previous installers connect this the other way around?

So what would you just me to do?

correct way as youve done it

dont have a clue if you see him ask him :D
 
correct way as youve done it

dont have a clue if you see him ask him :D
:) will do if I meet home in person.

But what should I do now? Take the pump out from the ufh and let it run from the boiler pump only.

Could you give me an answer in what the way forward is?
 
:) will do if I meet home in person.

But what should I do now? Take the pump out from the ufh and let it run from the boiler pump only.

Could you give me an answer in what the way forward is?

whats the heat load of the ufh i would be surprised if its over 5kw thats really your issue can you down rate the heating on vaillints ?
 
whats the heat load of the ufh i would be surprised if its over 5kw thats really your issue can you down rate the heating on vaillints ?
Don’t know how much heat load it has got. But how comes that the pump at the Manifold works against the boiler pump? It does not make a sense at all to be fair. I do not think that the whole setup is correct the way it’s been done. The boiler pump pushes I to the top and the manifold pump pushes right back ...

You seemed like to have a solution to solve this problem. I could possibly take the manifold pump out and cap top and bottom end off and let the boiler do it’s job
 
after much looking your set up is a rehau manifold hkv-d with a
fixed temp control set

and it was piped up correctly

R.png
 
the flow and return manifolds are marked correctly the flow from the boiler connects to the return manifold Uponor do it this way as well
 

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