Search results

Jan 2019 (petrol) Polo, original 59AH Type EFB Battery 21/10/2025 IDE01834 Battery voltage 12.256 V (Engine Off) IDE01836 Battery current -4.407 A IDE01837 Temperature of battery sensor 15 °C IDE01839 Battery charge level 78 % IDE01841 Battery internal resistance 7.4 mOhm...

I've been driving VWs for over 60 years, and the battery only had to be replaced in one, a 6V ,1963 Beetle, after 6 years, all the others, from new, were in the family as hand downs for 20+ years and I used to replace the battery, purely precautionary, before handing the cars on after 10/12...

Here is a photo of one I definitely know was in service for ~ 35 years on a Riello burner in a Firebird SE Boiler, its not mine by the way.

This graph is possibly a good indication of the pressure loss. Its ~ 2.7M at 1550LPH so even at this very high flowrate the residual pump head at 100% speed is, (assuming a clean HEX), 6.3-2.7, 3.6M, 360mB, probably a bit on the low side but your system doesn't remotely require these flowrates...

As above, the "normal" way of increasing the effective pump head is to install a LLH (Low Loss Header), where the boiler HEX head losses only are dealth with by the boiler circ pump and the rad/system (secondary) loss are dealth with by another pump. I don't really see though why a a pump in...

1Kwh = 860 kcal and there are 60 minutes in a hour. (860 = 3,600,000/4186) Some use a very long winded formula but I've used this for over 60 years since my introduction to SI units. So, kWh = LPM*60*dT/860 or any variation of this. ( I get mixed up in the lower/upper case of the units but the...

Its quite easy to calculate the flowrate as long as you have accurate flow and return temps, you said you were buying more accurate sensors? You know that the boiler % output is quite accurate so at say a steady 30% output, 36*30%, 10.8kW and if the flow/return dT is 15C, then the flowrate is...

A bit strange why the pump output was modulating at all on option 6 at a fixed constant pressure of 400mbar and also now at a far greater pump head and circ rate and rad output (if at the same flowtemp) that the boiler output is now only 30% vs ~ 40% previously.

Yeah, a max 400mbar, 4.0M pump head always seems to me to be a bit on the low side, especially with a massive (if this one) circ pump like this

Thanks Fred, I certainly know how to use SI units and you now know what "granny charging is" (y) A "granny charger" is a colloquial term for a portable EV charging cable that plugs into a standard household outlet, also known as a Level 1 or In-Cable Control Box (ICCB) charger. It's called...

Well, if they do use pump overrun in their system (with integral circ pump) boilers but not, by default, in their heat only boilers, its a bit disingeneous to say the least to offer it as a optional extra. Vaillant heat only (series "4") boilers like the Ecotec Plus 424, 430, etc, as far as I...

The fan overrun of a few minutes will obviously cool the HEX to some extent but its main purpose I would think is (as a Post Puge) to expel any residual combustion gases from the boiler when the burner shuts down, oil fired domestic boilers are now incorporating this post purge as well. ,

I would say a must under the conditions I stated above or/and if you have smart TRVs which can cycle the boiler on/off frequently, they havn't got a stainless HEX so IMO a very desirable function but would then also require a automatic bypass valve (ABV) installed.

This a pretty old thread but pump overrun is used to cool down the boiler HEX (heat exchanger) when the boiler is switched off by the programmer or the roomstat, if the boiler is asked to fire up again after say 10 minutes or so by the roomstat then it will be very difficult to get it away...

I think some coils are now flexible and are on hangers of some sort or other, unlike the rigid copper coils which are very unlikely to go banging about. The cylinder make might throw up something in its MIs.

Reading a fair amount lately re these EV granny charging cable plugtops/sockets etc going on fire and wondered how much heat is generated in the fuse itself, not a lot if my tests are to be believed, tests were done on a DC circuit with a battery so maybe more heat generated under AC...

If I'm reading you correctly, then suggest, with that kitchen tap opened, switch on the shower, if it doesn't start, measure as above from the shower to confirm that the flowrate is < 1.0LPM.

As pointed out above, its important that the inlet is connected to the LH side if the RAD is labelled inlet here. I have all my (8) TRVs installed horizontally on the outlet as I think that will give a more representative room temperature than installed vertically on the inlet, also, even though...

Your old Grundfos selectric is certainly a vetern alright so no harm in replacing it, beware though, the UPS 3 is a giant of a pump but has plenty of modes to calm it down for use with a OV system, do not run it at CC3(constant speed) which can create havoc in a OV system with pump carry over...

These are positive head pumps and require a flowrate of 1.0LPM or more from either a cold or hot tap to make either flow switch to start the pump. Is this only happening when HW only required?. A likely suspect might be a thermostatic shower which when first switched on only takes HW...