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Gravity Feed Central Heating 22mmx2 28mmx2? Answered

Hi All, mate of ours drained his heating as he was extending a kitchen rad, long story short when he came to fill it up again no flow from the gravity CH tank in the loft down to the boiler, tried sucking on the rads to get flow cracked pipes open and all sorts, he knows there is an issue with air locks in the system as he has them a couple of times, he had a power flush about 5 months ago to eliminate sludge so shouldn't be that, looking at the lay out of the house it looks like the pipework is an issue due to floor levels being all over up and down! so my question is would installing a second pump at the side of the header tank in the loft force water through and back up the boiler escape be a good idea for this on going problem, he's brassy so new install or referb of the system is a long way away, poor blokes house is freezing, thanks in advance for any reply and suggestions before I go round tonight to have another go, Cheers Matt

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tractorman44

Best Answer 4 years ago

The system must have enough pressure to compensate for the highest elevation it must circulate. At the minimum 1 psi water pressure to 2.33 feet in total system height. Also an automatic vent should be installed at the highest point. Increase the pressure mildly and purge the air manually then start the pump. OR.... fill slowly until water comes out the top vent opening , install a guage and add 5 psi. Remove the guage and reinstall the vent. Thats called 'static pressure plus 5 psi' and will fill just about any system to approximate capacity for circulation. Ladies and gentlemen...start your pumps !!!!

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Matth354

4 years ago

Thanks All, Started to fill again then stopped, looks to be an issue with the back boiler, I ended up loaning him the money to sort it :-)

TTFN

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steveastrouk

4 years ago

Yeah, forcing the circulation, providing you can get water to the bloody pump in the first place should work a treat. Whatever, given the weather in the UK this week, he needs a fix fast.

expat Steve