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MikeFl
MikeFl
@mikefl
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Joined: Apr 17, 2023
Last seen: Oct 16, 2025
Profile Activity
Topics: 1 / Replies: 118
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RE: Grant Aerona3 10kw - Few questions

For adjusting the overall system I'd leave everything open - you want to adjust things for when there's full demand on the system. Use TRVs to reduce ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona3 10kw - Few questions

It depends a little on what the current OAT is. You're basically lowing the WC line to generate less heat, so you could lower either end, or both ends...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona3 10kw - Few questions

Hi, welcome to the forum! To answer your questions in order: "having WC on overrides the thermostat settings is this correct? I've changed the the...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

Primary flow rate is good. Now it's time to sit back and stop thinking about deltaT, low loss headers, thermal mass, heating zones, ... have a break, ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

Has the flow rate now increased if you look at the regulator below the pipe where the mag one sits? Balancing the flows across the LLH is something ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

Isha killed my internet so out of loop a bit on this one, but has the auto bypass valve been checked? It should be set to almost never operate as your...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

I think Grant have recognised how unfriendly the controller is, with bringing out (soon) there own 'smart' controller, but I'm not expecting this to b...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

@crimson So far as I understand it, before the plumber started fixing things (i.e. when you had the blown DHW controller) most of the CH zones were wo...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another ASHP Performance Thread - 13kW Grant Aerona

Your conclusions (1) and (2) are probably valid, and common for most ASHPs it seems - the defrost cycles nobble performance, as although they only tak...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another ASHP Performance Thread - 13kW Grant Aerona

The standard flow regulator which comes with the Grant (and I think yours looks like one), you read from the bottom of the float, so 29l/m if I can se...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

If you can get them to focus on the flow rate, which seems to be the main issue. Playing around with the HP parameters is really tweaking to help with...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

As @allyfish has pointed out, that flow rate is an issue - the 'square-headed' screw-like thing below the gauge window on the regulator is what contro...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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