SteamyTea Posted November 12, 2020 Share Posted November 12, 2020 (edited) 15 minutes ago, MarcelHoldinga said: The installer said that your bathroom is usually the hottest room in the house, and that there would normally always be an open loop into there... I know very little about the mess that is plumbing, but is that an old fashion idea where one radiator was always hot, to stop the boiler blowing up or something. Is there a risk by turning down the flow temperature, that the DHW may not get very hot. I would expect the controller to sort this out, but if someone that does not understand HPs fitted it, they may assume differently. 20 minutes ago, AliG said: There will be a lot of heat coming off the cupboard which in itself will be boosting temperatures in the house. Yes, we think an airing cupboard is normal, it is really a failed design. Edited November 12, 2020 by SteamyTea Link to comment Share on other sites More sharing options...
ProDave Posted November 12, 2020 Share Posted November 12, 2020 What are the thermometers on the manifold reading? i.e what temperature is showing? Link to comment Share on other sites More sharing options...
joe90 Posted November 12, 2020 Share Posted November 12, 2020 29 minutes ago, SteamyTea said: Is there a risk by turning down the flow temperature, that the DHW may not get very hot hopefully @MarcelHoldinga can set different temps for heating and DHW (unlike me). Link to comment Share on other sites More sharing options...
MarcelHoldinga Posted November 12, 2020 Author Share Posted November 12, 2020 11 minutes ago, joe90 said: hopefully @MarcelHoldinga can set different temps for heating and DHW (unlike me). yes, separate settings for UFH and DHW - UFH currently on 36C, DHW is at 45C Link to comment Share on other sites More sharing options...
SteamyTea Posted November 12, 2020 Share Posted November 12, 2020 12 minutes ago, joe90 said: hopefully @MarcelHoldinga can set different temps for heating and DHW (unlike me). Hopefully. It would be a very poor design if it can't. Where system boilers fixed temperature in the olden days? Seem to remember my old Baxi only had on/off and a diverter to the CH or DHW. Link to comment Share on other sites More sharing options...
SteamyTea Posted November 12, 2020 Share Posted November 12, 2020 (edited) 4 minutes ago, MarcelHoldinga said: yes, separate settings for UFH and DHW - UFH currently on 36C, DHW is at 45C Good. Knock the UFH down to 30. Don't muck about with little steps. If it is too cold, up it. Edited November 12, 2020 by SteamyTea Link to comment Share on other sites More sharing options...
MarcelHoldinga Posted November 12, 2020 Author Share Posted November 12, 2020 53 minutes ago, AliG said: Weird that it is so neatly fitted yet no insulation. There will be a lot of heat coming off the cupboard which in itself will be boosting temperatures in the house. Not sure what the reason for having a loop without an actuator is. Is the system calling for heat to this loop even though all the thermostats are off? There's no insulation on the long DHW runs either, which I found odd... some of it sits directly behind plasterboard, so possibly no space for it, but there's a section in the loft where it could [read: should have been] fitted. Wouldn't having a bypass on the manifold negate the need for an open loop somewhere in the house? Afaik, when all the stats are off, the system won't call for heat. I've turned them all down to 17 or 18 degrees and it's been comfortable. Link to comment Share on other sites More sharing options...
joe90 Posted November 12, 2020 Share Posted November 12, 2020 12 minutes ago, SteamyTea said: It would be a very poor design if it can't. well I have just dug the manual out fir mine and can confirm only one water temp programable , so I am glad I have a buffer with a stat set to 35 and a blending valve down to 24. Link to comment Share on other sites More sharing options...
PeterW Posted November 12, 2020 Share Posted November 12, 2020 19 minutes ago, MarcelHoldinga said: there's a section in the loft where it could [read: should have been] fitted. that needs doing as it could (will) freeze if you are not careful. What model of ASHP is it ..?? Link to comment Share on other sites More sharing options...
MarcelHoldinga Posted November 12, 2020 Author Share Posted November 12, 2020 2 hours ago, PeterW said: that needs doing as it could (will) freeze if you are not careful. What model of ASHP is it ..?? it's a warm space - insulation is in the roof, so fingers crossed shouldn't freeze up I'l have a look and get back to you on the heatpump model Link to comment Share on other sites More sharing options...
AliG Posted November 12, 2020 Share Posted November 12, 2020 The uninsulated DHW pipework will be acting like mini radiators around the house. I think under Scottish building regs hot water pipework all has to be insulated, but I may be wrong. It is all insulated in my place and I can still use an IR camera to see where all the pipework in the ceilings is. Luckily it will be relatively easy to fit, other than for the stuff behind plasterboard. I think what we are trying to figure out is does the system pump hot water around the bathroom loop when the other loops are off or is it only when the other loops call for heat that the water is hot? In the pic you posted earlier the bathroom loop had flow, it would seem unlikely that it has flow when the ASHP is not switched on, but maybe it does. The temperature gauge will tell you if the flow is hot and there is probably a light somewhere that shows if heat is called for from the boiler. The other easy tell of course is the bathroom would be way warmer than everywhere else. Link to comment Share on other sites More sharing options...
daiking Posted November 12, 2020 Share Posted November 12, 2020 22 minutes ago, AliG said: The uninsulated DHW pipework will be acting like mini radiators around the house. I think under Scottish building regs hot water pipework all has to be insulated, but I may be wrong. It is all insulated in my place and I can still use an IR camera to see where all the pipework in the ceilings is. In my first floor bathrooms I like to think of this non-lagged pipework as UFH. 1 Link to comment Share on other sites More sharing options...
scottishjohn Posted November 12, 2020 Share Posted November 12, 2020 19 minutes ago, daiking said: It is all insulated in my place and I can still use an IR camera to see where all the pipework in the ceilings is thats just showing what crap quality and no doubt thin insulation has been used and no joints taped probably If done to a quote it will be thin and cheap stuff used and little time spent on fitting it -more probable that cold sweating condensation will be more of a problem if not lagged in a well insulated house If its well sealed house not really sure how much real heat loss to outside world there will be old drafty house --certainly will be a lot Link to comment Share on other sites More sharing options...
MarcelHoldinga Posted November 12, 2020 Author Share Posted November 12, 2020 7 hours ago, ProDave said: What are the thermometers on the manifold reading? i.e what temperature is showing? I noticed it at 32C at one point the other day (UFH had been off for a while) then made a point of checking when I knew the UFH was running, and it was near the 38C setpoint on the internal ASHP Module. I've since reduced the LWT temp to 36 - intending to knock it down some more. Link to comment Share on other sites More sharing options...
MarcelHoldinga Posted November 12, 2020 Author Share Posted November 12, 2020 @PeterW ASHP is Daikin Altherma. Outside unit model number ERLQ008CAV3, Interal unit model EHBH08CB3V. We've a 300 litre DHW storage tank, which is set to 45 C. Link to comment Share on other sites More sharing options...
Stones Posted November 13, 2020 Share Posted November 13, 2020 On 11/11/2020 at 17:17, MarcelHoldinga said: Our slab is around 130 sqm (about 120sqm internal), so not too far off yours.... I've had a root through the menus on our ASHP (Daikin Altherma), and it looks like the installer has stopped down the menus so we're not able to select weather compensation - it's there in the manual, but the footnote indicates that some options may be hidden from view... ? Frustrating that I don't appear to be allowed to control my own heating system in my own house... coudl it be to do with the fact we're getting RHI? Do they stipulate specific usage conditions on the units being installed? Page 13 tells you how to access installer settings : https://www.daikin.co.uk/content/dam/document-library/declaration-of-conformity/heat/air-to-water-heat-pump-low-temperature/ehbh-cb/EHBH-CB_EHBX-CB_4PEN383118-1C_Installation manuals_English.pdf It will simply have defaulted to end user settings 1 Link to comment Share on other sites More sharing options...
MarcelHoldinga Posted November 13, 2020 Author Share Posted November 13, 2020 Thanks @Stones, I will give that a go and see what I can unearth. Link to comment Share on other sites More sharing options...
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