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Daikin problem

Tog Porter · 2024-01-17T14:04:24Z

Hello. I am not a professional, just a householder. My house is an old barn with very thick stone walls. I had a Daikin Altherma 3 ystem fitted in the summer under the ECO4 system. Outside model: EBLA 11 DAV 3 Inside model; EDLA 11 DA 3V3 The installer has created 2 zones (upstairs and downstairs). They also fitted new radiators , solar panels, and wall insulation throughout the house. I previously had oil fired heating and changed because the installer said an ASHP system would save me money. Now we have snow and freezing temperatures outside, it seems that we have serious heating problems. The setpoint is set to 39 degress, but the Daikin control panel shows an actual temperature of only 34 degrees. Does this indicate a fault with the system? I have emailed the installer and Daikin, but not redceived an answer. The third party thermostats (one for each zone) are set to 15.5 degrees, but only 13.5 degrees is being achieved. The actual room temperatures are down as low as 11 degrees, whereas before the cold weather they were reaching a comfortable 17+ degrees. The radiators have been bled and the pressure is fine at 1.4 bar. So, our heating is not reaching comfortable levels any more, yet the cost has jumped astronomically from £6.70 a day to £29 a day (equivalent to over £800 a month) I am a pensioner (71) and cannot afford to pay that kind of money, and for a cold house to boot. Can anyone advise on what action, if any, I should take? If the tank temperature will not reach the setpoint, I am wondering if the unit may be the wrong size for my house. How can I tell? Many thnaks and best wishes. Tog 🙂

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Mike H

(@mike-h)

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21/01/2024 2:23 pm

Posted by: @togfather

↑

@toodles Thank you for this. I will give it a try 🙂

Although this is generally good advice, as @iancalderbank pointed out, you need to get the very low flow rate fixed first in order to get heat into your house.

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iancalderbank

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22/01/2024 11:03 am

@togfather the flow rate is crucial. If that stays at 10.7, you will never move enough heat, there is basic physics in the way, the rate of movement of the water is directly related to the rate of the heat movement, it needs to be 20-25l/m at least.

I don't know enough about daikin to know if there could be some setting causing it to be low. If you are able to turn off the backup heater, please see if that makes any difference to the flow rate, if not then something else may be required.

@toodles @chrislay can you help with where are the pump speed settings on a daikin?

regarding your installer and daikin

1. they are just plain wrong about weather comp costing money. the point of weather comp is that it reduces the heat pumps power in proportion to how warm it is outside (or increases it in proportion to how cold, if you like). The times when its mild spent running at lower power , saves you money. (Bit more to it than that, but thats the "in a nutshell")

2. The low flow rate is a clear and obvious demonstrable fault with the system. There is no way they can "debate" whether its large enough. Its not, the system will never move enough heat to warm your house with this low flow rate. You can legitimately keep on calling them back, asking for your money back, until they get this value to where it should be.

My octopus signup link https://share.octopus.energy/ebony-deer-230
210m2 house, Samsung 16kw Gen6 ASHP Self installed: Single circulation loop , PWM modulating pump.
My public ASHP stats: https://heatpumpmonitor.org/system/view?id=45
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Toodles

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22/01/2024 1:36 pm

@iancalderbank I have just looked in the Daikin Installer’s Manual and I am attaching a screen grab of the relevant part of a page about pump volume. I am confused to say the least! With my sight and having to magnify the image on my iPad, navigating the pages is very awkward. I will try to find HOW to adjust the flow rate but meanwhile, at the bottom of the image is the manual details so that Tog can look it up if not in possession of a printed copy.

Regards, Toodles.

Toodles, heats his home with cold draughts and cooks food with magnets.

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Toodles

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22/01/2024 1:45 pm

Just found this link for the manual in case it helps you.

https://www.daikin.co.uk/content/dam/document-library/Installer-reference-guide/heat/air-to-water-heat-pump-low-temperature/EHVH11-16SU28CB6W,%20ERHQ-BV3,%20ERLQ-CV3_4PEN449979-1_Installer%20reference%20guide_English.pdf&usg=AOvVaw3OcY6H5ivH90kEetHkPonT&opi=89978449Regards ," title="GOOGLE.COM" rel="nofollow" target="_blank" >

GOOGLE.COM "https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjVi5-qj_GDAxX_SEEAHVfYDi8QFnoECCAQAQ&url= https://www.daikin.co.uk/content/dam/document-library/Installer-reference-guide/heat/air-to-water-heat-pump-low-temperature/EHVH11-16SU28CB6W,%20ERHQ-BV3,%20ERLQ-CV3_4PEN449979-1_Installer%20reference%20guide_English.pdf&usg=AOvVaw3OcY6H5ivH90kEetHkPonT&opi=89978449Regards ,"

Toodles

Toodles, heats his home with cold draughts and cooks food with magnets.

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Toodles

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22/01/2024 2:13 pm

I’ve done my best as my sight allows for now, may I suggest Togfather that you look at section 8 on configuration where you will find mention of the back up heater. My system doesn’t have such a heater and therefore, I don’t wish to rootle through the configuration which may not be the same anyway! I’m glad my installers set up my pump correctly, it sounds like your is a real nightmare job and the installer should be putting it right for you - compensation?

Regards, Toodles

Toodles, heats his home with cold draughts and cooks food with magnets.

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ChrisLay

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22/01/2024 10:13 pm

@iancalderbank I don't know if you can set the actual pump speed. As far as I know the controller sets the speed to maintain the delta t. 10.7 is the minimum and the max is about 40. It will then switch the compressor on/off as well. I think the default dt is 7 or 8.

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