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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 24, 2025
Profile Activity
Topics: 17 / Replies: 2699
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RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

So deltaT across rad circuit = 37.9-24.4 = 13.5C. ~5C is what we are looking for. So Im expecting the return from rads to be more like 32C than 24...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Yes. If the pin feels sprung then no problem. If it moves freely then the closing piece (not sure what it's called) may be stuck. A few sharp taps ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Not a good January? My heat pump used 840 KWh of electricity

You adjust the end points of the sloped line.you presented earlier. This will be somewhere in the menu, probably the installer menu. I would reduce ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Not a good January? My heat pump used 840 KWh of electricity

Yes thanks, good plot Yes initially, but then you turn down the weather compensation curve until the house is at just the right temperature, that...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Not a good January? My heat pump used 840 KWh of electricity

Situation normal then as @tim441 says you are almost certainly going to have to meddle if you want your system to work efficiently. T...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Not a good January? My heat pump used 840 KWh of electricity

Black thing looks like (probably) a low loss header combining the output of the two pumps. You will get complete mixing in that which could in princi...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

On the grounds that turning the pump speed down didnt help I would put it back up again. Slow flow = higher deltaT across radiators = higher FT neede...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Rate the quality of your heat pump design and installation

Only half!

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Not a good January? My heat pump used 840 KWh of electricity

Quite likely not but...with two pumps you have the opportunity to get a very good turndown/modulation ratio and a level of redundancy against failure....

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

Sorry thats lots of numbers, but no clear explanation what they are measuring. What is needed is the temperatures of flow to and return from the rad...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: ASHP & Radiator Sizing - Measuring Heat Loss

That's correct. You probably will need to measure flow rate though, spec sheet will likely just be a pump curve.

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

So heating pipes go from 22 copper to 22 plastic to 28 copper? What a lazy sod of a plumber who fitted the heat pump Would it be practical to replac...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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