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ASHP-BOBBA
@ashp-bobba
Member Professional Installer
Honorable Member
Joined: Dec 6, 2024
Last seen: Feb 25, 2026
Profile Activity
Topics: 2 / Replies: 407
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RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

@patch321 I expect they are trying to balance the zones?

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

Lower pump speed = less flow = lower heat transfer. Speed 2 - 20lps at DT5 = 7kW Speed 4 - 30lps at DT5 = 10.5kW Also the ASHPO will have minimu...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

Unfortunately it seems to be oversized. I can answer to you points as follows: 1) I would not recommend this unless you are sure you will check that...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

@jamespa Yes, it is a balance of transfer using all components of the system so the flow, curve, plate exchange, expansion control and evaporator fan ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

@jamespa sorry James, yes larger surface area, messing with the DT. also this allows even lower running temperature, technically you could over size t...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: GSHP WOES! Midland based engineer recommendations?

@johnbroome if it is not the pressure in the expansion vessel then just look for a slow leak somewhere, top up as needed.

2 months ago
Forum
Ground Source Heat Pump (GSHPs)
Reply
RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

@jamespa oh this is very good results on your system, yes, its just for fun and in house training but I am experimenting a few things.   1) I...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: GSHP WOES! Midland based engineer recommendations?

@johnbroome `yes, worth checking bladder in expansion vessel for sure.

2 months ago
Forum
Ground Source Heat Pump (GSHPs)
Reply
RE: GSHP WOES! Midland based engineer recommendations?

@johnbroome perhaps, does it rise in pressure when heated and then drop when off?  

2 months ago
Forum
Ground Source Heat Pump (GSHPs)
Reply
RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

can you see here it not like a set of steps every 20 mins, it runs flat for 2 or 3 hrs. I also currently have a Vaillant that is running 808hrs for ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

Please see attached graph from 8.5kW Ecodan serving a 244m2 hose new build 2025. see how the return flow is steady. This is dissipating it heat so i...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

Great this is open loop so surely the heating should remain on constantly? Or until it hits the target temp from the tcc? Looking at your graph yo...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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