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pump overrun
The Broad Street cholera outbreak (or Golden Square outbreak) was a severe outbreak of cholera that occurred in 1854 near Broad Street (now Broadwick Street) in the Soho district of the City of Westminster, London, England, and occurred during the 1846–1860 cholera pandemic happening worldwide. This outbreak, which killed 616 people, is best known for the physician John Snow's study of its causes and his hypothesis that germ-contaminated water was the source of cholera, rather than particles in the air (referred to as "miasma"). This discovery came to influence public health and the construction of improved sanitation facilities beginning in the mid-19th century. Later, the term "focus of infection" started to be used to describe sites, such as the Broad Street pump, in which conditions are good for transmission of an infection. Snow's endeavour to find the cause of the transmission of cholera caused him to unknowingly create a double-blind experiment.
Hi, I have noticed recently that when the central heating, set at 60 on boiler, goes off the pump no longer overruns for the period of 3 minutes like it always has. Is this a problem? With the dhw it does the 1 minute overrun still.
Thanks.
Hi,
I have a Y Plan system with Glowworm HX system boiler vented system. The system as originally fitted has one radiator without TRV (Landing) but also has a gate valved controlled by-pass. The pump is controlled by an output from the boiler.
Many years ago I added an Honeywell ABV and this...
Hello everyone.
Could someone please advise on a fix for this annoying problem?
I have a shower pump feeding our master ensuite which occasionally pulses once the tap or shower is turned off. This will continue to pulse until you turn the tap back on and the REALLY slowly turn it off. Or as my...
Happy New Year.
Okay, maybe the subject is a little dramatic, but hopefully I've got your attention for a few minutes 😀
After a recent upgrade of my CH system, which included a LLH and a new circulation pump, my trusty old Vaillant ecoTEC 637 Plus system boiler seems to be spending a lot of...
A simple question, but so far I've not found a definitive answer:-
Some older boilers use a thermostatically controlled pump overrun switch built into the boiler thermostat.
They are generally factory set and not adjustable.
At what temperature should it switch?
I'm specifically referring to...
I have an old Glowworm Fuelsaver MK2 in a Y plan installation.
It's still working ok apart from an issue with the pump overrun...
As of 2/3 weeks ago, when the room stat switches off the boiler, there is sometimes a thump in the vent/expansion pipe as hot water / steam is pushed up into the F&E...
Hi all, new to this forum and hoping to find some advice on my Grant Vortex 26 external combi boiler,
Basically the heat exchanger sprang a leak, dripping on to the terminal box of the hot water pump below causing a short. I replaced the pump and the fibre washers on the heat exchanger, problem...
Hello,
I am not a plumber, but I have done some DIY in the past, so I have some experience. Following a new boiler install by a professional about a year ago, there remains an issue when the pump overrun initiates. The boiler is a Worcester Ri compact installed downstairs. the pump is...
My earlier post entitled Honeywell ABV setting raised several issues and a number of well-informed comments (thank you). One topic in particular seems worth pursuing on its own, hence the present post. Your comments will be appreciated.
Widely-used domestic CH pumps such as the Grundfos UPS2...
Hi,
I've been searching for a while for an answer to this. Had heating engineer out today to look at the boiler. Problem is that the pump is coming on at 2AM, 4AM, all hours. The rads upstairs have their valves open only a little so the water's quite audible. Apparently, this is the overrun...
Just thinking... my new boiler (a Viessmann) was installed without pump overrun, apparently it's not required because it has a stainless steel heat exchanger, but when the burner cuts out I see the temperature slowly rise (as reported by the boiler) to around 95 degrees, I assume this is the...
This topic has sort-of been touched on in a couple of other threads, notably 'Two questions about a bypass valve', but I haven't quite found the answer I'm looking for.
I have a Potterton Suprima 80 boiler (non-condensing, old-school) and recently replaced the old constant-speed circulating...
I have just had my question, which was asked honestly and in good faith, closed unceremoniously by someone who accused me of "fishing" instead of calling an engineer. The accused should be allowed right of appeal, especially when injustice is so obvious. Not sure what "fishing" refers to but I...
I have an old Apollo 60B which is running well but has an intermittent boiling issue. It seems to be connected to the pump overrun stat but it works correctly most of thetime and I would be grateful for advice. Intermittently – once every few days - water boils in theboiler for a few seconds...
Hi ALL,
Ideal Logic Heat + 15 heat only (not combi) boiler keep running (not burning) about 2 minutes after heat demand stops, seems like pump running 2 minute as well to get heat away from boiler inside. Just wondering Am I right, in this two minutes one of the zone valve must be open to get...
Boiler is a WB Greenstar CDi conventional 40. Pump is connected to LzNz. The pump runs constantly ie provided the boiler has power, the pump runs.
Any suggestions as to what needs to be done so that the pump cycles till the boiler cools and then switches off.
Tom
Want to arrange pump overrun. Current system, pump and boiler controlled by timer, when boiler cuts out on control stat. pump continues to run, no problem. When boiler and pump stop together on timer, residual heat is not dissipated and high limit stat. is thrown requiring manual reset. It is...
Hi all.
Was instructed to replace an ideal classic with a Worcester 18RI. Quoted (including electrics) and started the job. The customer was clear in saying he didn't want any modifications to the cylinder etc. The system is a thermal store with 2 pumps a room stat and cylinder stat. When the...
MDS PLUMBING
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I had an original central heating/hot water system incorporating a single pump, single room stat and a mid-position valve. I have now built an extension and extended the heating system so that I have 2 pumps and an additional 3 zones each controlled with its own valve and stat. There is a single...
craigskelly
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Boiler working fine, heating and hot water perfect, no faults on display, apart from pump overrun coming on when no heat called for. ?? If flow and return was back to front could this possibly cause this?
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