@transparent well, we were left with the manuals and told how to turn the temps up and down with the room stats and how to set a schedule for the hot water (which he didn't do correctly 🙈). We have had some paperwork but no DNO as they applied for it in their name and not ours so Western Power (now national grid) can't help us as it's not in our name and the supply company Consumer Energy solutions just tell us they'll call us back but never do. 🙄
We are signed up for the Indra V2H trial so will have battery storage options from our Nissan e-nv200 40kw/h and have 3.6kw of solar. We did briefly look at wind a year or so ago but the costs didn't justify the gains.
For information this is my flow temps now. It currently runs for around 7-8 mins then off for 3-4 mins. When running it's using 0.8kw.
It's 10 degrees windy and raining here today.
It looks like it's hitting its lower modulated limit. At a COP of approaching 4 0.8 kW is less than 30% of your ASHPs rated output, which sounds about right. I don't know Samsung but on my Ecodan, there is a setting that changes how much around the target flow temp the actual flow temp can vary.
You could try running the WC/water law a little bit hotter and use the thermostats to stop the house getting too hot. That might reduce the cycling and make it more efficient. Or it might not... Also try not to heat only parts of the house at a time too much.
I have a similar sized house and my ASHP cycles at about 9 deg and above when keeping the whole house at about 20 deg. I've managed to get it down to 1-2 times per hour. I'm happy enough because the COP is about 4 at 10 degrees.
the supply company Consumer Energy solutions just tell us they'll call us back but never do.
That's a pretty large company to be based out of Swansea. They're actively recruiting, which isn't surprising because the Welsh Government is proactively pushing energy-efficiency measures.
However, they will have to respond to you if they value their Trustmark status, which is referred to in this article from Wales Online:
I don't think the verbal briefing on running your system complies with Part-L of the Building Regulations.
At the very least you must have a copy of the pre-installation survey and the schematic of what your installation comprises. Every valve and control-input will be identified on that diagram.
It is commonly the case that the LCT Application is made by the Installer rather than the home-owner.
You still require a copy of the Application Response which they were sent by WPD. It should have your address identified on it. Since you will also have an invoice from the company for the work, that documentation would be perfectly acceptable for the sale of the house at a future date.
I suggest you email CES and give them the link to this discussion.
It's unlikely they're intentionally cutting corners if they're handling of £m of grant funding on behalf of the Welsh Government. I suspect they're just totally overwhelmed by the surge in demand and their administration work is suffering.
That's unfortunate, it means the ashp doesn't have any PWM control over the primary pump. A bit 2005.... I'd have expected more from Samsung to be honest.
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.
@transparent thanks for the details. I'm going to have to rummage through the info I have to see exactly what's there. I'll come back once I've had a look. Thanks.
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.
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.
Your Wilo pump has a manual choice of three different ways in which it can operate.
There is another type called the Varios Pico-STG which has a 4th option, whereby the pump pressure curve (and hence flow-rate) can be altered by an external device, such as a heat-pump controller.
Here's an extract from the relevant manual pages for that Varios pump:
If the installers didn't choose the Varios type, then it's presumably because the Samsung controller doesn't have an output signal which could've been used.
This post was modified 2 years ago 2 times by Transparent
Your Wilo pump has a manual choice of three different ways in which it can operate.
There is another type called the Varios Pico-STG which has a 4th option, whereby the pump pressure curve (and hence flow-rate) can be altered by an external device, such as a heat-pump controller.
Here's an extract from the relevant manual pages for that Varios pump:
-- Attachment is not available --
If the installers didn't choose the Varios type, then it's presumably because the Samsung controller doesn't have an output signal which could've been used.
From looking at two samsung installation manuals, one from Joule (that because of an ssl certificate issue, I couldn't download) and one from Secon renewables (attached) it looks like the samsung really is a dumb unit. It needs two external pumps, which are on/off only, and an external flow sensor.
Most other modern ASHPs have these built in, and have full PWM controlled pumps.
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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