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Air Source Heat Pumps (ASHPs)
Last Post by Patch321 2 hours ago
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 Patch321
(@patch321)
New Member Member
Joined: 2 hours ago
Posts: 1
Topic starter 13/01/2026 10:03 am  

Hi, 

I think I’m having some issues with my Ecodan ashp and the pumps, details are as follows:

 

11.2kw Outdoor Unit (PUZ-WM112VAA)

300L Indoor Unit (EHPT-UKHDW)

Flow Temp Controller (PAC-IF073B-E) 

New Build Property

UFH downstairs

Rads Upstairs

Running on Temp Comp Curve (tcc)

I’ve attached some photos showing the current set up.

 

So the issue (I think) I’m currently having is that, when the compressor comes on the circulation pumps switch on - Happy days, but when the compressor shuts down so do the circulation pumps with a flow rate of 0.

The flow rate rises but then drops when the compressor shuts down, which then the return flow is higher than the flow rate, which slowly drops, only then does the compressor switch back on to increase the flow temp.

Am I correct in thinking that the most efficient way to run the tcc is for the circulation pumps to continuously run including the compressor but just at a low level? 

Also I’m worried that because the circulation pumps down seem to be running that the t1+t2 sensors (they are on the correct way)

are just detecting stagnant glycol, hence the slow drop in return until it then switches back on? 

Also does anyone know the optimum flow rates for my ashp?

Any help/guidance would be appreciated.

 

Thanks

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