Samsung weather compensation oddities

cloudclear · 2024-11-15T20:02:19Z

Hello First - I want to say what a fantastic community and resource this is. It's been eye opening to a newbie ASHP owner. Thanks to all!! To the question I have. I have a recently installed Samsung 12kW EHS Mono HT Quiet R32. I am not overly convinced by the install (despite 2 X recommendations of the installer) but it gives us warm water and heat although not overly efficiently. I can see routes to fixing that. A key one is to make sure the weather comp system is working. I have recently followed the general advice of bypassing the thermostats by raising the temp to 24+ and then playing with the flow temps in the Samsung controller. Earlier this week when playing with those temps I could not get the flow temp below 34.8degrees resulting in the house continuing to warm as I lowered the curve lower and lower. I had a bit more success today and got the flow down to 32degrees and got closer to balance, but ultimately the temp kept increasing and would not stop even as I reduced the temp on the controller. Has anyone else had problems dropping the flow temp to balance the temp on a samsung and any guidance on how to crack it? I do not have indepth data (looking at Planet Devices to crack that) and possibly HavenWise to maximise efficency. Feedback on both welcome! I can't do Homely as my ASHP is a fair distance from the house. Any input welcomed. Cheers CC

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Air Source Heat Pumps (ASHPs)

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Old_Scientist

(@old_scientist)

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Joined: 1 year ago

Posts: 249

17/11/2024 3:00 pm

Posted by: @cloudclear

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@old_scientist thank you for this. It sounds like we have the same set up. Only difference is that I have two zones - one for UFH in extension and another for rest of the house.

Given that. I have changed my 2091, 2092 and 2093 to the same setting you have to see what happens!

Without additional monitoring, how do you know if the ASHP is cycling or not?

I don't know how having two zones may complicate/affect things, especially as presumably the two zones may require different flow temps?

With #2091-3 set to Use (Signal On/off) only, I know it's not cycling.

But otherwise, I would watch the smart meter IHD to see live electricity usage and/or listen as I can hear if the circulation pumps are running.

What I haven't yet established is if there is any measurable difference in efficiency / running costs to control with a room thermostat versus control through the Samsung controller WL & #2091, allowing the heat pump to cycle to maintain constant LWT. I've gone with the former for now, as I like to be in control / manually control things whereas I'm sure some people would rather just set and forget it, and allow the system to churn away in the background maintaining a steady temperature in the house without having to think about it or touch anything. There is no one right way - there are options and you can choose which works best for you in your setup.

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.

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cloudclear

(@cloudclear)

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Joined: 10 months ago

Posts: 8

Topic starter 17/11/2024 4:18 pm

Agree re two zones. Shouldn't make any difference to how the system runs. The flow temps in FSV for both Floor and Rads are low enough for the floor too.

Can I ask what your FSV 201*, 202* and 203* settings are? You mentioned you haven't "found" your higher temp yet. I am wondering if you have 32 set for both of 202 and 203 so you have a flat curve. If I did that, would I then find my lowest output flow temp? Apologies if that is a daft question.

Once I understand the weather comp I am likely just to go with Havenwise or someone similar and leave a computer to figure it out!

Economics is man made, lets use it to make a net zero world

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