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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 23, 2025
Profile Activity
Topics: 16 / Replies: 2636
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I presume the diverter valve then, which would make sense. As you say you would expect this to be on the inlet to the BT

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Is it a 2 way valve or a 3 way diverter valve. Normally the (3 way) diverter valve is the only motorised valve needed. As you say taking some tempe...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@davidnolan22 I will continue to think about this. We could do with a comment from @bobtskutter on the pump arrangement , he is good on the hydron...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Fundamentally emitter output increases with flow temperature. Once the system has got to the point where flow temperature is such that the emitters a...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

if 38 at -3 is specified as an end point on the curve, the target temp will never go above 38. If however you shut zones down then it may overshoot b...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

OK nothing obvious here so more questions Im afraid What controls the pumps Are you sure that the secondary remains open (and pumped) during d...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Starting our heat pump journey in 4 bedroom house (possibly)

I got several quotes like this for a (on the face of it) similar season. I also got two quotes of 5K + BUS grant, from the installers I anyway trust...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

OK Its a complex system (5 pumps!), how is it controlled: eg weather compensation only without room influence, zone valves?, TRVs?, external thermo...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Im really sorry to hear that the installer didnt sort the problems. Ecodans are renowned as good pieces of kit, so there must be something specific ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Rate the quality of your heat pump design and installation

@stopbar thanks for your contribution and I am pleased you are now sorted. When I read it I immediately thought - this is so typical. Installers le...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona3 13kW Noisy pipes after balancing

If water is flowing through the radiators quickly then DT will be small for any given heat transferred to the room, and vice versa. The heat transf...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

I think thats expected with the way this particular model works, see page 49 of the manual. Adjusting the room temperature 'set point' shifts the WC ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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