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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 19, 2025
Profile Activity
Topics: 16 / Replies: 2631
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RE: Load Compensation and Weather Compensation

In the context of a single zone heat pump system a valve that self balances very slowly for equal (or set) temperature would avoid the need to adjust ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How accurate was your heat loss survey?

For me: Two full surveys (each taking 3hrs, one of which cost me £300) got to 16kW. Correcting for obvious errors in the surveys got to 10.5kW. Meas...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Nibe F2040 periodic warm water increase fails

Ok. The key point I think you have made is that the error only occurs only during the disinfection cycle. That's getting quite deep into NIBE specif...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

@matwin If you plan to commission one it might be worth checking that at least one installer will take notice of a blower test. Some can be a ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

1. I certainly did, I found two installers who would accept evidence of actual heat loss and factor it into their calculations in a way which meant th...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Nibe F2040 periodic warm water increase fails

Many people with heat pumps heat water only to say 48 with a weekly legionella cycle (often using the immersion) taking it to 60/65. This should all ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Commencing on an ASHP Installation Process

Good spot on the data. The physical size of the 7,kW model is different however so I don't think it's likely the 5 is entirely a SW mod of the 7, how...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Load Compensation and Weather Compensation

Fair enough, I was just checking I hadn't missed something! Thanks for replying.

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Load Compensation and Weather Compensation

This is so important. For my money householders need to know how to balance radiators using the lsv. Why? Because, given that its unlikely that radi...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Load Compensation and Weather Compensation

The other important point about wc is that the controller gets the signal to change what it is doing at the same time as the principal driving factor ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Load Compensation and Weather Compensation

Surely you can 'correct' a mildly oversized rad by turning down the lsv during the balancing process? Certainly that's what I did with my installatio...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Load Compensation and Weather Compensation

As @ashp-bobba says there are lots of variables. My house takes 3-6hrs to change temperature by a degree. I have one room with a fancoil that respon...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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