Notifications

Clear all

Is this a bad installation and is there something wrong with my Samsung heat pump?

David999 · 2024-03-24T21:10:40Z

Got a bit of ice and could you say if it’s normal and if this installation is ok so close to the walls

Page 5 / 30 Prev Next

Air Source Heat Pumps (ASHPs)

Last Post by David999 1 year ago

360 Posts

15 Users

89 Reactions

51.5 K Views

RSS

David999

(@david999)

Honorable Member Member

Joined: 2 years ago

Posts: 302

Topic starter 28/03/2024 3:01 pm

@toodles should it be tied shut like that.

ReplyQuote

Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4427

28/03/2024 3:18 pm

Posted by: @david999

↑

@derek-m I was out looking again and no ice but was wondering if this pipe being cable tied is the cause.

The sensor to which I refer is located inside the unit and should be attached to the pipework coming out of the evaporator.

ReplyQuote

sjn

(@sjn)

Trusted Member Member

Joined: 2 years ago

Posts: 23

28/03/2024 3:25 pm

@david999 the OAT sensor on the back of my 8kW unit looks the same as yours. I think the actual sensor is towards the open end of the pipe and the cable tie will be holding the pipe tight to the cable back into the unit.

ReplyQuote

David999

(@david999)

Honorable Member Member

Joined: 2 years ago

Posts: 302

Topic starter 28/03/2024 3:29 pm

@sjn that makes sense

ReplyQuote

Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4427

28/03/2024 3:35 pm

Posted by: @allyfish

↑

@derek-m interesting video. Stateside the defrost mode in A2A systems enables direct electric heating of the incoming air to avoid loss of heating function. Having got rather fed up over two winters with my A2W system doing exactly that - losing heating function during defrost, I've just enabled the 3kW immersion back-up heater on my system LLH, which was never wired up properly at install, or commissioned. Supplementary back-up heating will enable 3kW of direct electric heating during defrost if the LWT is below 38degC. I'm hoping it will help maintain target LWT during periods of regular defrost, and mitigate the time the ASHPs needs to reach LWT after defrost, but I may need to wait until next winter now to determine that. 😉

Achieving efficient defrosting is a problem with which a sufficiently large volumiser would probably assist, rather than using an immersion heater. When operating in heating mode the water in the volumiser is heated and therefore stores thermal energy, this thermal energy can therefore be used during the defrost cycle which should help reduce the possible cooling of the heat emitters.

Producing the thermal energy gradually using the heat pump should be more efficient than using an immersion heater during the defrost period.

ReplyQuote

Toodles

(@toodles)

Illustrious Member Contributor

Joined: 3 years ago

Posts: 2290

28/03/2024 4:00 pm

@david999 Ah, that I don’t know, the one on ours has a tube or sleeve over it ‘pipette style’ and suspect that yours may follow the same scheme but on the other hand, it may be protective packaging and that it should just rest over the clip on the case. Perhaps you have access to the installer’s manual where you could determine which is the case. Regards, Toodles,

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

ReplyQuote

Transparent

(@transparent)

Illustrious Member Moderator

Joined: 4 years ago

Posts: 2743

28/03/2024 4:14 pm

Why would a sensor for external air temperature be placed in the airflow being drawn through the fins?

Placing it within a sleeve might provide mechanical protection, but to me, it still seems to be a strange location.

Save energy... recycle electrons!

ReplyQuote

David999

(@david999)

Honorable Member Member

Joined: 2 years ago

Posts: 302

Topic starter 28/03/2024 4:15 pm

@toodles yup I can feel the sensor inside so likely ok. Have swung a camera around to watch how it manages the ice. At 76 it’s nice that you keep an interest in these things, I’m 66 an engineer and still learning new stuff but it keeps you alive I say. 😊

👍

ReplyQuote

Toodles

(@toodles)

Illustrious Member Contributor

Joined: 3 years ago

Posts: 2290

28/03/2024 4:16 pm

@derek-m The nearest we have to a buffer is the LLH which I don’t think could hold more than a few litres at most; when the Daikin (no extra heating element involved) goes into defrost mode, the cycle lasts about 4 - 5 minutes at most and then the radiators start warming again. The radiators (10 plus towel rail) during a very cold day will drop to a ‘cold water; sort of temperature for those few minutes and then back in business and rarely have I been aware such a cycle is going on at all! Regards, Toodles.

This post was modified 2 years ago by Toodles

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

ReplyQuote

Toodles

(@toodles)

Illustrious Member Contributor

Joined: 3 years ago

Posts: 2290

28/03/2024 4:19 pm

@transparent Surely, if you need to know the OAT, the best place for the sensor is close to the air inlet for the pump? After all, that is the air that is about to enter the system. Regards, Toodles.

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

ReplyQuote

David999

(@david999)

Honorable Member Member

Joined: 2 years ago

Posts: 302

Topic starter 28/03/2024 4:20 pm

@toodles I installed so much insulation that when the installer moved a faulty room stat to another location he wired it wrong and it was two days before we realised the heating was off.

ReplyQuote

Toodles

(@toodles)

Illustrious Member Contributor

Joined: 3 years ago

Posts: 2290