Central heating not circulating after New Navien Combi fitted to Santon Premier system. | Central Heating Forum | Page 2 | Plumbers Forums

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Central heating not circulating after New Navien Combi fitted to Santon Premier system.

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Discuss Central heating not circulating after New Navien Combi fitted to Santon Premier system. in the Central Heating Forum area at Plumbers Forums

ShaunCorbs said:
Yep

Low loss header
Click to expand...

Then if the old boiler was running at ∆T 11°c the pump would of been capable of the higher flow rate and pressure required to overcome index circuit.
Sounds like this needs a low loss header and suitably sized secondary pump. The secondary side pipework will be ok in size but the new boiler internal pump isn't capable.
Alarming really as the installer really should have considered this 🤔
 
SJB060685 said:
Then if the old boiler was running at ∆T 11°c the pump would of been capable of the higher flow rate and pressure required to overcome index circuit.
Sounds like this needs a low loss header and suitably sized secondary pump. The secondary side pipework will be ok in size but the new boiler internal pump isn't capable.
Alarming really as the installer really should have considered this 🤔
Click to expand...

Makes you laugh tho they thought a 15-70 would do 2” pipework it’s the state of the industry atm either people don’t care or they don’t know chances are it was a 25-80 or 32-80

Was he even commercially qualified to work on the install
 
SJB060685 said:
Then if the old boiler was running at ∆T 11°c the pump would of been capable of the higher flow rate and pressure required to overcome index circuit.
Sounds like this needs a low loss header and suitably sized secondary pump. The secondary side pipework will be ok in size but the new boiler internal pump isn't capable.
Alarming really as the installer really should have considered this 🤔
Click to expand...
I agree. The boiler developed a leak from the heat exchanger seal 9 weeks in and charged 200 quid to do a 35
minute job under guarantee. Now they do not want to know.
 
JohnHuson said:
I agree. The boiler developed a leak from the heat exchanger seal 9 weeks in and charged 200 quid to do a 35
minute job under guarantee. Now they do not want to know.
Click to expand...

Didn’t they call the manufacturer out ?
 
JohnHuson said:
I agree. The boiler developed a leak from the heat exchanger seal 9 weeks in and charged 200 quid to do a 35
minute job under guarantee. Now they do not want to know.
Click to expand...

That would of been a warranty job and the manufacturer liable for payment, not you!
Unfortunately to rectify this is going to cost more and the situation clearly demonstrates the installer doesn't understand the principles.
 
Time to get a solicitor involved
 
SJB060685 said:
That would of been a warranty job and the manufacturer liable for payment, not you!
Unfortunately to rectify this is going to cost more and the situation clearly demonstrates the installer doesn't understand the principles.
Click to expand...
This customer is prepared to spend money in excess of what was paid for what should have been paid under
warranty in a small claims court.
 
Where the old boiler pump was
 
I think between us we have arrived at the problem. My concern now though is as I mentioned above are the existing rads at ∆T 60°c, if so the flow temperature will need to be around 90°c to give a rad MWT temperature of 80°c and full out put.
 
Post 35
 
After the external heating plate heat exchanger which will need to be added
 
You're going to need to separate the system and as Shaun says a plate heat exchanger is your best bet as it will protect the boiler circuit from your decades old and no doubt fouled system. once you separated then a suitable pump will be installed on the flow out of secondary side of the plate heat exchanger.
At this point I strongly urge you to find a firm/engineer who understands the principles of hydronic system design.
 
Close enough
 

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A pump is required to supply the pressure required and the flow rate required. It's actually the system that creates the pressure but the pump has to be able to meet demand. As it stands the boiler integral pump just can't do this.
 
JohnHuson said:
I have a qualified engineer arriving tomorrow afternoon. Thank you for your input! John.
Click to expand...

Do they do commercial heating systems ?
 
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