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Newbie out of her depth – Samsung AE120RXYDEG 12kW heat pump

 
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Air Source Heat Pumps (ASHPs)
Last Post by BAMi 2 hours ago
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
5011 kWhs
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Posts: 740
10/03/2025 9:32 am  

@bami Is there some reason the room would have a lot of moisture in it overnight? If not that would kind of suggest the double glazing panel has blown and th window itself is cold. You usually see moisture between the two panes if that has happened.

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 BAMi
(@bami)
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68 kWhs
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Posts: 13
Topic starter 10/03/2025 9:53 am  

@bontwoody 

It's not inbetween the glass but on the glass itself.  I'll do a bit more investigating!  I'm still getting used to the house, which has been a building site since I moved in.  Now all the rooms are done and the flooring down I'm now looking at how it actually functions and any issues.


   
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 BAMi
(@bami)
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Posts: 13
Topic starter 10/03/2025 9:58 am  

Hi to all those who have generously replied to this thread.  I've now had another discovery.

The 3rd bedroom is always too cold.  I measured the room size and it is 3.4m x 3.6m, yet it only has a 50cm x 70cm rad. This is the same sized rad as in the tiny en suite bathroom!

The 2nd bedroom is fine.  It measures slightly smaller than the 3rd bed at 3.2m x 3.6m, yet has a rad sized 80cm x 70cm.

The installer contact has given me all the design & heat loss documents this morning at first ask, which is great.  Straight away I see on the schematic diagram that the room size for Bed 3 is wrong.  It's down as 2.4m wide instead of 3.4m (and strangely has no doorway!).  You can see from the bathroom below, which is 3m wide, that Bed 3 width is wrong. 

So the rad size in Bed 3 needs to be increased to an 80cm from a 50cm wide.  This cold room will be affecting the heat demands of the rooms either size, which won't be helping anything!

Schematic diagram

The room size for the Utility is also way out!  It's 2.7 x 2.4m, not 3.98 x 3.36.  No wonder it's always boiling in there, as the rad is huge!  Whoever measured my house was having a very, very, off day 🙄

If they've got my room sizes so wrong maybe that's why they've given me a ASHP which is too large for the actual square area of my property? 🤔

This post was modified 2 hours ago 2 times by BAMi

   
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 JohnR
(@johnr)
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10/03/2025 9:59 am  

The condensation demonstrates that the curtains are very effective so the window gets cold. My bedroom has a fairly big (2.4m x 1.2m) north-facing window which was triple glazed a few years ago and gets some condensation in cold weather, but less than when double glazed. A hazard with 1970's construction is thermal bridging around the windows. I wouldn't be surprised if it's got an uninsulated steel beam as a lintel. An infrared thermometer quickly reveals the cold spots. The thermal bridging guide is full of examples of good and bad practice but is short of examples of how to retro-fit improvements. I've applied the Wallrock thermal lining paper around the windows as something that's better than doing nothing.

If there's a lot of heat leakage around the windows then secondary glazing set in its own frame away from the existing window will increase the path length for the heat loss around the window.

Edit 1: If there's drying plaster or concrete from the building work then that will have raised the internal air humidity.

Edit 2. Where is the garage with the cylinder? If that's at the opposite end of the house from the lounge then there will be heat loss in the pipework. You wouldn't be the first to suffer this problem. Restricting the flow through the lockshield valves in the other radiators should help more hot water reach the lounge.

This post was modified 2 hours ago by JohnR

   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
5011 kWhs
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Posts: 740
10/03/2025 10:07 am  

@bami thats helpull. Did you also get the heat pump spec and heat loss calculation?

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 BAMi
(@bami)
Eminent Member Member
68 kWhs
Joined: 1 day ago
Posts: 13
Topic starter 10/03/2025 10:21 am  

@bontwoody 

I can't see anything in the documentation that says it's a heat loss calculation but there's 20 odd bits of paper so I'll keep looking.

Attached is what I can see on the ASHP.

ASHP 1
ASHP 2

   
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 BAMi
(@bami)
Eminent Member Member
68 kWhs
Joined: 1 day ago
Posts: 13
Topic starter 10/03/2025 10:33 am  

OMG, the attached schematics (even with incorrect room sizes) says it should be an 8kw ASHP, not 12!!

schematics2

   
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