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Grant 13kW Aerona3 - issues getting zones to temp

Crimson · 2024-01-16T07:17:28Z

Hi all, New here and looking for some advise. I have a 220sqm property with a Grant 13kW (I need to check if it’s 13 or 17) Aerona 3 ASHP installed as part of a full renovation/extension heating and plumbing redesign. We moved in on 1st December and have never quite had the heating be up to scratch. There are 4 zones each with Heatmiser panels (mainly floor space measures listed not total room sizes) 1 underfloor heating open plan kitchen/dining area approx 44sqm 1 utility with underfloor approx 8sqm Ground floor heated by radiators (Eskimo) - consists of 2x 28sqm living rooms, 1 hall at 16.5sqm, 1 downstairs wc 2 sqm - approx 74.5sqm First floor heated by radiators (Stelrad/towel rads in bathrooms) - consists of 2x 20sqm bedrooms, 1x 18.5 sqm bedroom, 1x 16sqm bedroom, 1x 9.5 sqm bathroom, 1x 3.8 sqm ensuite, 1 Wc 2 sqm, 1 storage cupboard 1sqm - approx 93sqm The downstairs area seems to never hit the desired temp of 21c. I have set it at 21c on and 19.5c off on the heatmiser oanel. Every morning it’s not even sitting at 19.5c. Of note the hall and landing essentially same space so I always wonder if that is an issue as it’s serviced by just 2 radiators between them. All rads were sized according to heat calcs performed by the plumbers. The Grant is running with weather compensation. The plumber/installer came other day and set: 2101: 50c (not sure why set this as that’s the fixed point but keeps referring to the weather curve) 2102: 50c 2103: 35c 2104: -4c And on the panel set to 40c. This improved zones by I reckon 1c but I still never see the downstairs zone hit its desired temperatures. Of note in mornings the rads downstairs never feel as warm to touch as later in the day so I wonder if the system is struggling at coldest points of the day? All radiators have TRVs opened to max. hot water has been an issue too but panel for that has lost power. Seemingly the second time with a power cut. Am awaiting electrician to come and get that back on and check what settings that has. im concerned as can see the electricity meter is flying up and we’ve not got a system working as it should. Can provide more info if needed and photos etc. be good to have some advice as I’m at the mercy of the plumbers who so far on this project have made some blunders so don't quite trust their setup. To clarify this is a Aerona 3 13kW.

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Crimson

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Topic starter 22/11/2024 10:33 pm

Turning TRVs down to zero on all rads but the one that has no air nor water. After a while opening the bleeding valve on problem tad right open some water eventually came out so suspect a tonne of air or theres a blockage on this small Eskimo rad.

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Crimson

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Topic starter 23/11/2024 5:04 pm

Anyone got any tips on an airlocked radiator? This one seems to be having issues

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Toodles

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23/11/2024 5:16 pm

@crimson I don’t know what the experts might do but, when a radiator is plumbed in, it is ‘dry’ containing just air and filling is accomplished by opening the air vent at the top and then allowing it to gradually fill with water from the flow pipe. If you completely drain the offending radiator and then gradually fill it until water exits from the air vent - might this do the trick? Please note: I’m not a plumber, an expert or an installer but from observing radiators being filled in my own home, this is my suggestion. I’d be interested in any comments from those more knowledgable amongst us please. Regards, Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.

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Crimson

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Topic starter 04/12/2024 7:35 pm

Thanks @toodles, Im awaiting the installers to get back to me (seemingly gone back to radio silence).

I’ve altered the WC to be as follows:

That’s 36C at 7C.

Currently temps seem to be around 19.5-20C in the living rooms like this.

note this is 3C above design at -3C.

How “bad” is this? I need to feed back to architect about current state. I suspect to get to temp I’d need to push to 45C and min temp of 30C. Which is well above design. Not really sure where to go with this, rads were doubled in output, hallway tripled essentially.

Still cycles often, but that small rad seemingly air-locked I cant imagine helps

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Toodles

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04/12/2024 7:45 pm

@crimson A raise in flow temperature to 45 deg. C should not be too disastrous - my system hits the low 40’s some of the time on colder days and I think the highest I have observed was approx. 48 deg. C when it was -7 OAT. 45 deg. C is usually an acceptable temperature for LT heat pumps. Regards, Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.

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Crimson

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Topic starter 05/12/2024 8:46 am

Yeah, I’m just concerned that the design of the system is 40C at -3C ambient, if I keep pushing up percentage wise I’m getting quite above that and wonder if its simply rads are still undersized - which means their heat loss calculations are still far off for those rooms

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Crimson

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Topic starter 06/12/2024 9:45 am

I've created a separate thread to discuss WC settings as feel that's a more specific topic.

Still waiting on installers to come and sort that airlocked rad. Over a chat with one of the installers checked underfloor and other zones to ensure nothing up there. Something that I realised is the flow setter in the plant room looks black now.

Certainly wasn't like that before. And I keep finding air in the LLH, and rads upstairs at the front and any towel rads. Yesterday bleeding some rads upstairs, produced some rusty looking orange water. Mentioned to installer and he said they hot flushed the system when did the upsize not long ago and put in inhibiter so not sure why that's happened.

Here are photos of the flow setter (ignore the level it was taken when things weren't quite right) before, and now (with it black)