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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 2, 2025
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Topics: 17 / Replies: 2087
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Reply
RE: 14kW Midea ASHP in an old leaky building

@batalto - it would be interesting to compare flow rates, given we have similar units. I haven't cleaned the gauze filter, the one adjacent to the hea...

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

Some measurements from 0800 this morning: Midea controller: ambient 11 LWT 41 RWT 35 capacity 0kW flow 0.83M3/H current 0A Room temps (design temp...

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

@cycleneil - no, its controlled by an on/off room stat in the kitchen, currently set to 21 degrees, kitchen design temp is 19 degrees, so most of the ...

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

The rads are actually Ultraheat branded, and the output per size varies slightly between different manufacturers. My installer went with a certain sup...

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

Exactly, that is why I am increasing thinking it is a compound problem, both the heat pump capacity is inadequate at low ambients and the heat that is...

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

I wasn't meaning to be harsh (and note that I chose a Midea over a Mitsubishi, for various reasons, including it must be said its low profile design b...

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

Current (0915h) flow/return temps and top middle rear panel rad temps: Midea controller: Ambient: 7; LWT 47; RWT 41 PHE pipework: Primary in 45; p...

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

This gets complicated. Firstly there is the nominal output, as listed in the catalogues, usually at a delta t of 50. A correction factor then has to b...

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

@derke-m - Argghhh!!!! The forum has just deleted my reply. very frustrating. 'Something went wrong with your submission' or words to that effect, and...

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

@derek-m - OK, here are some minute by minute readings, col head abbreviations as before, csv text format. Ambient throughout was 5 degrees: Time,LW...

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

@mookyfoo - Midea promote themselves as being value for money, based on economies of scale, they are a huge company. They also promote themselves on t...

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

@batalto - I think they may have photographed the board, they certainly photographed other parts of the system. I have to be mindful that if something...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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