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DHW temp Samsung AE120RXYDEG 12kw ASHP with Gen 6 controller

 
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Air Source Heat Pumps (ASHPs)
Last Post by BAMi 43 minutes ago
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 Old_Scientist
(@old_scientist)
Reputable Member Member
868 kWhs
Joined: 9 months ago
Posts: 127
16/03/2025 6:18 pm  

Posted by: @bami
↑

@old_scientist Thank you so much for this info 🙏🏻  I'm still in the very early stages of getting to grips with it all.

The booster is set to Use and the delay time is 75 mins.  Overshoot is 0C.

I've decreased the time the tank heats on the schedule down to 60 mins and will see how that goes.  This time is below the delay time of 75 mins for the booster anyway, so the booster even while on shouldn't affect anything.  As the overshoot is set to 0C that can't be responsible for heating the water higher than the set point.

I agree, it doesn't look like that was the culprit, but was worth checking.

Let us know how you get on.

 


   
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 Lenny
(@lenny)
Trusted Member Member
726 kWhs
Joined: 2 years ago
Posts: 31
17/03/2025 10:19 am  

My temp sensor is housed in a small (10mm maybe) dia pocket in the tank. At one time my DHW temp was way too high and I noticed the sensor had become dislodged (so was not reading actual temp. Replacing it brought them temp back to where it shound be and adding a small blob of hot glue has stopped a reoccurrence.

 

Samsung 12kw ASHP, nine 415w PV panel array, upgraded radiators and DHW water tank (+ pumps etc). Two wireless zone thermostat controllers and Samsung MWR-WW10N


   
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Toodles
 Toodles
(@toodles)
Famed Member Contributor
11371 kWhs
Veteran
Joined: 2 years ago
Posts: 1839
17/03/2025 11:45 am  

@lenny I think some owners even apply a blob of heat sink compound to ensure good heat conduction to the sensor. Toodles.

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


   
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 DerekDeLeon
(@derekdeleon)
Active Member Member
56 kWhs
Joined: 2 years ago
Posts: 6
17/03/2025 12:58 pm  

Could it be that the legionella cycle has been on and you've just noticed it once the temperature has come down a bit but it's still higher than your set temperature?

What temp have you set for your heating water? could there be an issue with the 3 way valve / zone valve?

FWIW I think you are doing the right thing putting the DHW onto timed as it's better for COP to heat the tank from a cooler temp rather than continuously on a 5 deg hysteresis.


   
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 BAMi
(@bami)
Trusted Member Member
148 kWhs
Joined: 1 week ago
Posts: 28
Topic starter 17/03/2025 1:15 pm  

@lenny Thanks for this info.  It's certainly something to investigate after ruling settings out.


   
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 BAMi
(@bami)
Trusted Member Member
148 kWhs
Joined: 1 week ago
Posts: 28
Topic starter 17/03/2025 1:19 pm  

@derekdeleon The legionella cycle is on a Tuesday and I took the photo on Saturday, so not it's not that.

Had a look yesterday and the DHW was set to 43C but the temp in the tank after the 2 hour schedule finished was 44.5C.  I've now set the schedule to 1 hour but am going to be out this aft when it finishes so will have to check the temp tomorrow.

> could there be an issue with the 3 way valve / zone valve?

No clue!  I'm hoping to speak to the installers some time this week so will be having a chat with them about it.

This post was modified 43 minutes ago by BAMi
This post was modified 42 minutes ago by BAMi

   
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