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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 13, 2025
Profile Activity
Topics: 17 / Replies: 2839
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RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

The water pump manual tells us there are 3 pins, control, feedback and voltage reference ( presumably the return is via the case, ie ground) or if th...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

I think you are right about multi-core, I just saw it in the manual. One of the cables appears to be the pwm cable. Im thinking narrowboats, whic...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

Two wires doesn't seem enough - this isn't a boat with return via the chassis (I presume) so I would have expected three! That said I thought that PW...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

Its not pretty but its pretty clear, pump speed is constant. However the manual seems to say it isnt! Something odd!

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

If this is the case then its a bit weird its not enough particularly as you presumably have a primary that is pretty low resistance (or is it?). So t...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

Im not an expert on pump curves (or indeed very much else) however there is a good guide to reading pump curves here/p> I think the way to look ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

They decide is by measuring the flow/return temperature. The control loop adjusts the output of the heat pump (within the limits it can achieve) to g...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter...

Fascinating. Referring to your first post, is it a cycle or a defrost. It looks like the latter but maybe Im misreading. Can you confirm Understa...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 1meter boundary planning question about heat pumps

Planning officers tend to be black and white in their approach in my experience so minor or not it's a breach. In practice it almost certainly hangs...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Don’t ‘TRV’ (Trust a Radiator Valve!)

Thats odd. I have experienced a (Drayton TRV4) which is stuck open because a plastic insert inside the head about 4mm dia and 2mm thick had somehow f...

10 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Should We Rethink the Name “Heat Pump” for Homeowners?

Cue the 'ignore climate change and it might go away' lobby running articles telling their readers that heat pumps have been cynically rebranded by the...

10 months ago
Forum
Well & Truly Off The Grid
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RE: Ecodan help - flow temperature spikes when operating in weather compensation mode

The peaks in your graph (which I presume are the 'spikes' you are referring to) appear to be at different FTs. What is the set FT, what is the set FT...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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