Hi @rvdbreemer,
Here’s an answer to MELcloud - #98 by OlivierZal – provided by a user which is an air-to-water heat pump expert!
He proposes one flow which is very easy to create, and another one which is more complex.
You are invited to use the “power by the hour” app.
First and foremost:
- heating once every 2 days won’t be enough: heating once every day is recommended / needed in most cases;
- 60°C is possible but not good for the compressor as it will wear it out a lot faster: recommendation is a maximum temperature of 53°C to avoid damaging the machine and a 7-day legionella cycle.
With that out of the way, here are few examples.
Always start to check the price, and this is done every hour since we have hourly prices.
These screenshots are from 2022, so changes have been made but it remains 90% the same.
This is only for hot water, heating is a bit more complex.
The first example is just to show how to think: this flow is the most easy one someone can make. It doesn’t take current water temperature or other factors into account – what the advanced flow does.
The top section of the flow has to match with the legionella settings in the machine: it basically only changes back the hot water set point temperature to 53°C when it’s one of the cheapest hours, or right before legionella cycle; otherwise it’s set to 40°C.
Also, if the set point is already at what I’m going to set it to (e.g. 40°C or 53°C), it won’t send the command since that only takes up unnecessary capacity from MELCloud.
