@dawnrg

Hi Dawn

Can I suggest you try and get the original installer back or engage with Grant Uk directly yourself, I have in the past and they have been excellent to deal with, the issue I passed on to them was similar to yours and they were able to help even though it wasn't of their making (all down to set up and system commissioning). Your system may need some fine tuning and a full customer handover done.

Hi Dawn,

Our Technical Team would be more than happy to help. You can reach them on 01380 736920 from 7:30am to 6.00pm weekdays and 8:30am to 1:00pm on Saturday.

We also have a customer handover guide and a series of videos which explain the Aerona³ controller, its settings and the display buttons. You may find these resources useful:

Handover Guide -

GRANTUK.COM "https://www.grantuk.com/media/4106/aerona3-ashp-handover-guide_july-21.pdf"

Aerona³ Videos - https://www.youtube.com/user/MyGrantUK/playlists

Kind regards

Grant UK

@kens Hi Ken, I had a long conversation with Grants on Monday morning which fired me into action on this forum. They were the ones who told me that it wasn't a good idea to turn the hotwater temp down, that the heat flow setting of 55deg was what the pump was built with, and that calculating CoP was not easy and required many variables. (See original post). The installer is a plumbing/heating engineer the developer uses and while he may be able physically fit them, hasn't any real knowledge of how to adjust them hence everything is set at default. We are coming to the conclusion that we will probably let it run as it is until next summer when its service time and then get a quakigfied Grat engineer in. (See below).

There are many that say they fit them but how many understand how to make them run efficeintly. Not many I guess judging by Grants list of Grant approved engineers. Many listed around my area do not mention ASHP of any breed on their websites (if they have one), and out of twelve listed within 50 miles of me, only two acknowledge they install and service Grant machinery.

@grantuk The original post will tell you I did exactly this on Monday morning hence my need to come on this forum:-  "The Grant Aerona 10kW has a default design flow temperature (not entirely sure what this actually is) as stated on the commissioning form of 55degC. I spoke to Grants this morning and I got the impression from them that this is fixed. Is this correct? Hot water is separate apparently and is set by the thermostat in the hot water cyclinder. Its boiling hot! You have to add a lot of cold to make it workable and this seems mad. Must be so inefficient.They seemed to think that 55 -60 was about right and thought my idea of turning it down to 50 or less was not ideal, and started going on about thermostats and various gadgets in the tank that would need adjusting. "

I have the handover guide which I personally found didn't tell me anything about how to adjust things. It hasn't helped that the installer fitted it four months before the house was sold and hence no handover. He is not a Grant engineer - see my comment to KenS above.

I will have a look at the Grant videos on You Tube - thanks.

I do think though, that while you have a list of approved G1 installers, when you drill down on their websites (some don't have one and three in my listed area come up as website doesn't exist) only two out of the twelve state they fit and service Grant ASHP. You may want to go back to those listed and double check (ie due dilligence) that they really do do G1 work as stated on the tin so to speak.

Thanks for your help, though, and responding.

@dawnrg We have a Grant Aerona 13kw and our hot water is set to 45 degrees which is plenty hot enough. We had ours serviced recently and the flow temperature is set to 52, we aren’t certain if the weather compensation is set. We keep the house at 19.5 degrees and whilst it does at times (in last 2 days) drop as low as 18.7 it warms up again within an hour. Yesterday (very cold outside) we used 70kwh for all our electricity consumption.

I would at least turn your hot water down.

It might be worth giving Grant another chance in view of their post.

Where in the country are you based?

Jane

@dawnrg 

Dawn,

Do you require any further help or should I concentrate on assisting other people with problems?

Posted by: @jane

@dawnrg We have a Grant Aerona 13kw and our hot water is set to 45 degrees which is plenty hot enough. We had ours serviced recently and the flow temperature is set to 52, we aren’t certain if the weather compensation is set. We keep the house at 19.5 degrees and whilst it does at times (in last 2 days) drop as low as 18.7 it warms up again within an hour. Yesterday (very cold outside) we used 70kwh for all our electricity consumption.

I would at least turn your hot water down.

It might be worth giving Grant another chance in view of their post.

Where in the country are you based?

Jane

@jane,

Your comment about hot water is spot on.  45C is easily hot enough; any more and you'll just be adding cold.

I know nothing about Grant ASHPs but is your flow temp set at 52C or is that the maximum?  52C is very high for a heat pump and if it's running at that temperature all the time it will be very inefficient.  Radiators at 52C will feel very hot to the touch. 

Of course it may be that your house needs its radiators at 52C when it's very cold but a well-designed ASHP system shouldn't be running that hot all the time, if at all. 

@kev-m 

Hi Kev,

Having spent quite a number of hours going through the Grant installers manual, apparently wasting my time, I can confirm that they are not as easy to optimise as an Ecodan, but it should still be possible without too much effort.

Unfortunately most people are not aware that their ASHP has been incorrectly installed and/or incorrectly commissioned and optimised, so continue to go back to the same people who installed and commissioned the system in the first place.

I can fully understand why Brendon would get so frustrated.

@derek-m 

Easy to say re going back to the installer but what can one do.  You see the issues people have getting a company to even respond to initial enquiries.  The MCS installer route is supposed to be our saviour and safeguard and still the issues persist. It’s a nightmare from start to finish and much worse for some.

@morgan MCS is for installation quality. Setting up a system is very a different animal. I think the problem is that installers don't dial in systems. All that's needed is a hand over to users to say "do XYZ to get this working perfectly"

@batalto 

I was under the impression it was the complete job including, commission and fully setting up before hand over.

Otherwise it’s a case of, “ooh that looks lovely”.  “Well thank you, now you just need to find somebody to make it work properly for you”.   What kind of standard is that?

@morgan you can commission it, I just don't think you'll get any installer to dial in a custom heat curve per property. Better to leave simple instructions for the user to tweak themselves. It's not like it's hard - but people need to be informed on the process