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AllyFish
@allyfish
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Noble Member
4198 kWhs
Joined: Oct 31, 2022
Last seen: Mar 14, 2025
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Topics: 22 / Replies: 457
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RE: Grant 13kW Aerona3 - issues getting zones to temp

@crimson good morning. Lots of people here want this one fixed for you! What's the approximate length of buried pipework on the primary circuit under ...

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

Hi @crimson, sure. The formula is the sensible heat equation, to work out how much heat energy in kJ/s is being added. 9 is your flow rate as indica...

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

@crimson great stuff. The delta T between flow and return is high, especially when your ASHP is on low load, 1300W power consumption, that's about 1/3...

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

@Crimson, I hesitate to state it, but it seems like your plumbers are clueless. You need a fresh pair of eyes on the job as there's something seriousl...

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

Finally Grant is waking up and smelling the coffee and, when they offer their 'smart controller' option pack (which monitors primary flow rate), they ...

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

Hi @crimson, probably time to bite the bullet and get the system checked over by Grant. The installation manual from Grant has suggested circuits for ...

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

Some progress on the hot water. Reducing the flow on the secondary side to balance with the deficient flow on the primary side is a sticking plaster. ...

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

@crimson small steps towards a resolution. The flow rate is a biggie, that needs fixing. That will be throwing a spanner in the works in the LLH if th...

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

Hi @crimson, the flow rate is constant for Grant systems, as they have a fixed speed pump in the ASHP. If your primary flow rate is 9l/min, and the fl...

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

@crimson - is that flow rate photo taken with the ASHP running? It's showing a flow rate about 9 litres/minute. If so, that's way below Grant's minimu...

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

Most Grant Aerona ASHPs work on a DT of 5degC, they will push up to 8degC, but seem happiest with a low DT. If you are in the habit of turning the hea...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost Cycles - How Common Are They?

Psychrometric trickery this week. It's cold outside, but low relative humidity. The sort of 'dry cold weather' that Scandinavia routinely gets, and wh...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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