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Samsung Heat Pump – Can't Activate TW2 Pipe Sensor (for Delta T Control)

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 hour ago
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 bubuontheweb
(@bubuontheweb)
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Joined: 3 hours ago
Posts: 1
Topic starter 06/10/2025 12:06 pm  

Hello all,

I hope someone can help.

I have a Samsung split heat pump installed, outdoor unit AE090RXEDEG, indoor AE200RNWSEG.

Underfloor heating only.

A 100 L buffer is installed, where the out and in water pipes for heating are connected.

There is a recirculation pump mounted on the pipe which is going to the floor distributor. 

Heat pump set to work with water law. I believe the pump is oversized for the houses' heat requirements, as it has a lot of on/off cycles.

I wanted to mount one of the external sensor which came with the pump (blue wire one) on the pipe which is leaving the buffer tank.

The problem is I can't seem to figure out where do i connect the wires on the PCB.

According to the manual, this sensor is TW2 - which has to be connected to connector 17 and 18.

I did that but i don't see anything I can change in the service menu to account for it, also in the self test mode, there is no sensor displayed.

 

The reason why i wanted to add this sensor, is that the difference between water out and in is max 1 degree, even though the delta T is set to 5.

I assume the water from the buffer is cycling between out and in of heat pump, mixing the "hot" and "cold".

I was hoping that by reading this temperature, the DELTA T would actually be close to 5 and heat pump cycling will not be so frequent.

 

image

 


This topic was modified 3 hours ago by Mars

   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3019
06/10/2025 1:43 pm  

Posted by: @bubuontheweb
↑

Heat pump set to work with water law. I believe the pump is oversized for the houses' heat requirements, as it has a lot of on/off cycles.

Posted by: @bubuontheweb
↑

I was hoping that by reading this temperature, the DELTA T would actually be close to 5 and heat pump cycling will not be so frequent.

If the house loss is much less than the heat pump min output the heat pump will cycle whatever you do because there is no other way to match the output to the loss.  The deltaT will also be lower than the design value of 5, because the loss is lower.  I dont know where you are located but where I am its very mild at present so my heat pump is cycling even though well matched to the house loss.

Unless the heat pump controls the speed of the secondary water pump (the one on the emitter side) the deltaT will be determined by the emitters and heat loss anyway, not by the heat pump.

To detect a newly installed sensor you may have to power cycle the heat pump and its controller.  Don't forget to leave it off for a minute or more.

Best advice is almost certainly to replumb the buffer (which almost certainly is detrimental) as a 2 port volumiser, but I know that many installers refuse to do this and insist on fitting buffers. 😪 

 


This post was modified 1 hour ago 3 times by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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