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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 15, 2025
Profile Activity
Topics: 17 / Replies: 2134
AllTopicsReplies
Topic
K3 rads and ASHPs
4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 0
Views: 1762
Reply
RE: 14kW Midea ASHP in an old leaky building

@derek-m - it's just another example of MCS obfuscation. They don't use Midea in the product name. You have to search for the model number. If you sea...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

Rather bizarrely, I got the M-thermal Service Manual from Freedom's website: Bottom of the list on that page, click on the box on the left to sel...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@mjr - agreed. Here's a photo from the M-thermal service manual (I will try and track down where I got it from) showing two things: (a) S6 where w...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@batalto - see what I said about the price diffs a couple of posts ago - there is a difference, but it is not very much, which fits with same hardware...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@batalto - brilliant, you are a hero! It looks like S6 is upper mid position on the MAIN BOARD in the drawing just above the one showing the switch se...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@grahamh - yes, that helps, I will have a look inside the unit when it is less damp outside and see if I can make sense of things. Presumably if a 16k...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

Reviewing the entire history of this installation to date, I think the key points can be summarised as follows: All the design calculations were don...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@grahamh - I've not been able to find anything in the manual yet, but no rush, need to see if there is a problem at low ambients before fixing it. Hav...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@grahamh - its a very impressive spreadsheet, how you managed to keep on top of all those lookup formulas is beyond me. I did wonder if gh was you, bu...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

Apologies in advance - this is a very long post... @derek-m - you are of course right, as I feared you would be. The rad sizing was based on the hig...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

Hi @derek-m I agree the heat loss needs reducing as it is high, and there is scope for lowering it, even within the listed building constraints eg d...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Page 179 / 180
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