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Is the Grant controller a thermostat?

Dodgyknee · 2023-06-03T07:14:46Z

I'm about to have a 17kW Grant Aerona installed to run underfloor heating plus some upstairs bedroom radiators in a new build house. I've read hear that the controller is (or can be) the thermostat for the system but when I spoke to the installer I was told that it wasn't. It looks like there are going to be multiple room thermostats in the setup and I'm feeling a bit confused about what is right Csn anyone with a Grant clarify for me?

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Heat_Help

(@heat_help)

New Member Member

Joined: 2 years ago

Posts: 3

15/12/2023 8:01 am

@mikefl hi, sorry yes i meant flow temperature. Will give this a go over the next few weeks using modbus. Agree with what you say. I already have a controller set up in home assistant controlling the flow temp with protections in place but its messy, better to input via modbus

For the others:

As for a set back on the grant controller, this can be done using the low tariff mode. Just set the weather comp curve x degrees below what you require, set the low tarrif offset to x. During set back times have the low tarrif mode turned off, and during energised periods have this turned on. You set each time period in the grant controller.

Ive been doing this since i got the heat pump a few years ago and Grant of course were no help to set this up.

👍

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ghayne

(@ghayne)

Active Member Member

Joined: 3 years ago

Posts: 7

15/12/2023 7:13 pm

A bit late to the discussion. I've been reading parameters over Modbus from our 6kW Aerona3. I've managed to get the flow temperatures pretty low. The consumption is reasonable too. I'm reading the values with node-red and pushing data to an InfluxDB database and using Grafana for display.

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AllyFish

(@allyfish)

Prominent Member Contributor

Joined: 4 years ago

Posts: 518

18/12/2023 9:20 am

Posted by: @dodgyknee

↑

@allyfish I haven't heard about the Grant smart controller. Do you have a link you can share?

Hi @dodgyknee, I hope to have more info soon. I have some basic info direct from Grant, but under condition it is embargoed until product launch. (Early 2024)

It looks a much improved user interface with remote monitoring. Not sure if it can programme a 'true' night-time set back by dropping the WC curve by a configurable offset for lower night time LWT. That's one aspect of the Aerona's functionality that is lacking, especially for rerofit with wet rads where the option to lower the LWT overnight and maybe boost early morning would be desirable. Such flexible LWT control would be the way forward with variable TOU tariffs to leverage advantage of lower rate tariffs.

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Marvinator80

(@marvinator80)

Reputable Member Member

Joined: 3 years ago

Posts: 201

15/01/2024 9:43 am

House was 20.5 on average at midnight last night. Outdoor temp was 0. It got colder all night and went down to -8 at its lowest.

house is average of about 18.9 this morning. I guess that’s ok but would really want the system be able to hold its temp.

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HughF

(@hughf)

Honorable Member Member

Joined: 4 years ago

Posts: 489

15/01/2024 2:40 pm

@marvinator80 Bigger radiators, better insulation, or higher flow temperature - pick your poison...

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.

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RoamingBull

(@roamingbull)

Eminent Member Member

Joined: 3 years ago

Posts: 38

16/01/2024 9:57 am

Posted by: @allyfish

↑

Posted by: @dodgyknee

↑

@allyfish I haven't heard about the Grant smart controller. Do you have a link you can share?

Hi @dodgyknee, I hope to have more info soon. I have some basic info direct from Grant, but under condition it is embargoed until product launch. (Early 2024)

It looks a much improved user interface with remote monitoring. Not sure if it can programme a 'true' night-time set back by dropping the WC curve by a configurable offset for lower night time LWT. That's one aspect of the Aerona's functionality that is lacking, especially for rerofit with wet rads where the option to lower the LWT overnight and maybe boost early morning would be desirable. Such flexible LWT control would be the way forward with variable TOU tariffs to leverage advantage of lower rate tariffs.

-- Attachment is not available --

Regarding the new Aerona controller why so few zones?

Will the New Homely device be a better option?

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HughF

(@hughf)

Honorable Member Member

Joined: 4 years ago

Posts: 489

16/01/2024 11:12 am

@roamingbull you don’t want zones with a direct heat pump install…. One single zone, one constant temperature….

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.

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Dodgyknee

(@dodgyknee)

Active Member Member

Joined: 3 years ago

Posts: 14

Topic starter 16/01/2024 12:03 pm

@hughf LOL, I have 8 zones but there is a combined LLH/volumiser too. I wish I had a simpler setup 😕 I suppose there must be a way to undo some of the unnecessary elements of this install but I could do with a plan.

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HughF

(@hughf)

Honorable Member Member

Joined: 4 years ago

Posts: 489

16/01/2024 12:05 pm

@dodgyknee open all the zone valves, jumper out the thermostat wires, run the whole thing on weather compensation.

That’s pretty much it.

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.

👍

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Dodgyknee

(@dodgyknee)

Active Member Member

Joined: 3 years ago

Posts: 14

Topic starter 16/01/2024 12:12 pm

@hughf you make that sound quite easy! When you say open the zone valves, what does that require here. I'm afraid I'm just a couple of weeks into this adventure. I assume the jumper part is done at the thermostats?

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Marvinator80

(@marvinator80)

Reputable Member Member

Joined: 3 years ago

Posts: 201

17/01/2024 2:54 pm

Posted by: @hughf

↑

@marvinator80 Bigger radiators, better insulation, or higher flow temperature - pick your poison...

we’re mostly underfloor, have already installed bigger upstairs radiators. House is 2016 build and well insulated.

whacked up the flow temps. Last night was -8 and house was average of about 20 when I got up this morning.

quite happy with that.

stuck the wood burner on first thing and super comfort achieved! 🙂

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HughF

(@hughf)

Honorable Member Member

Joined: 4 years ago

Posts: 489

18/01/2024 8:24 am

@marvinator80 pleased to hear it…

we’re running at 47.5@0 at the cold end of our curve and the house is nice and stable at 21.5.

All about getting that flow temperature optimised for your house.

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.

👍

ReplyQuote