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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 17, 2025
Profile Activity
Topics: 17 / Replies: 2696
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RE: Load Compensation and Weather Compensation

Still not quite. As I read this the body adjusts for fixed flow when on (based on an adjustment made by the installer according to a table that doesn...

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

Er - that description you posted says that the trv shuts off the flow when the room is at the set temperature, which is also what seems to happen in p...

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

That's good to know - and in which case, adding anything fancy to the system to "automate" it sounds like (a) an unnecessary complication; and (b) lik...

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

Is that really the case? Won’t the rate of heat loss in the room change as it cools/warms outside and thus what it is balanced for today at 1c isn’t ...

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

Almost but not quite a trv with remote sensor. A trv with or without a remote sensor operates principally, so far as I know, as an on off device (alb...

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

As I understand it these balance for fixed dT That's not what's needed unless emitters are perfectly sized (which they inevitably aren't). What's n...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

3 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...

3 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...

3 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 ...

3 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...

3 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 ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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