Posted by: @sand

Hi all

I am using compensation curve, over the last couple of days I have noticed zone 2 is on most of the time. Is that normal ?

Zone 2 is radiators Zone 1 ufh.

I was using the mitsubishi wireless controller that came with the ecodan system, but have taken out the batteries to try to figure out what is calling for heat. 

The system is in play mode see image so that suggests to me the wireless controller has no bearing on the system now its off completely.

We have 5 radiators all with TRVs all set to 5, but surely at some point they would stop calling for heat. 

Does this maybe have something to do with the flow being too low for rads?

 

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@sand, the TRVs don't call for heat, they just shut off.  If you're running on weather compensation with no thermostats - and I think you are now - then the ASHP will only stop when the flow reaches whatever its target is and the radiators will be maintained at or around that temperature. If you turned the TRVs down they might shut off; all that would happen is that the flow temperature wouldn't decrease and the ASHP would probably start to cycle.  Do you mean zone 2 is running on the Ecodan display all the time or do you mean the radiators are always warm?

I have 2 zones too and the first picture looks like my zone 2.  You can see the weather compensation offset but can't change it (no up/down arrows).  You need do that in the zone 1 settings.  

How did you get to the second picture?  I can't get anything like that on mine?

For the last couple of days zone 2 has been on most of the day, on play icon see image, the rads are on warm not overly warm and trv set to 5. I just know what is calling for the heat. I had a wireless controller I assumed this was controlling the rads, but noticed yestarday morning on the controller heat requested was 19 and the actual room temp was 19 so, I checked the ftc and it just wouldnt go off it kept running most of the day.

I have changed the offset for zone , I lowered it -1 as downstairs was a bit warm.

Am I missing something, so should they the play icon be on all the time. Zone one is hardly on as thermostats maintain heat, they mainly in paused, not sure if thats correct term, square icon.

Sorry, should say just dont know whats calling for heat.

Sorry Kev M, see attached image on how to get that info.

 Under z1 z2 hold F1 down for a few seconds.

This icon circled is what I call play, it just wont stop.

Posted by: @sand

Sorry, should say just dont know whats calling for heat.

Hi Sand,

Don't panic.

The FTC controller is operating the heat pump, and below +7C outside air temperature your heat pump should be operating for most of the time, this is the most efficient manner. What you call the 'play' icon, just indicates that the heat pump is operating.

Think of it like driving a car. You have been asked to drive 100 miles in 2 hours, so you have the choice, do you drive at 50 mph for the full 2 hours, or do you stop and wait 2 minutes then speed up to 70 mph for 5 minutes, and repeat this method for the rest of the journey. You will still travel the 100 miles in 2 hours, but I suspect will use quite a bit more fuel with the stopping and starting method.

This is the way that your heat pump prefers to operate in weather compensation mode, when the outside air temperature is low enough to warrant continuous operation. It is the most efficient way for the heat pump to operate at a constant temperature setting, any increase in energy consumption is due to the lower outside air temperature, not the way in which the ASHP is operating.

@kev-m 

Derek to get from pic1 to pic2, press and hold the first button on the left under the i (information) icon.

Edit:  Or the other way about given how the pictures uploaded 😀

Thanks Derek for that analogy, its just that it has never done that before. It was on all night and the bedrooms got to 22.5.

It was soooo hot this morning got up but the batteries back in the remote, moved them to another bedroom. Thankfully its turned off, order resumed.

In our bedroom we have a bit of tech mainly puc from sky glass and tplink wifi extender, I'm wondering if there was a bit of conflict beacuse those items and the mitsubishi wifi controller.

Posted by: @sand

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Thanks Derek for that analogy, its just that it has never done that before. It was on all night and the bedrooms got to 22.5.

It was soooo hot this morning got up but the batteries back in the remote, moved them to another bedroom. Thankfully its turned off, order resumed.

In our bedroom we have a bit of tech mainly puc from sky glass and tplink wifi extender, I'm wondering if there was a bit of conflict beacuse those items and the mitsubishi wifi controller.

 

Hi Sand,

I think that you will find that your system will not work particularly well 'if you remove the batteries from the controller'. If the temperature is too high, then your weather compensation curve is probably set too high.

Just had to try something Derek it was perfect downstairs with the weather comp ufh, just upstairs was getting hotter and hotter all day.

That was at the comp curve figures you kindly gave me which was 50 @ -10, plus I had taken it down -2 on the ftc has it had been too warm downstairs, but it has been working perfectly with the ufh.

So are you saying I should take it down even further. 

Sorry if images look fuzzy but if you click on them they do become clear.

Posted by: @sand

Just had to try something Derek it was perfect downstairs with the weather comp ufh, just upstairs was getting hotter and hotter all day.

That was at the comp curve figures you kindly gave me which was 50 @ -10, plus I had taken it down -2 on the ftc has it had been too warm downstairs, but it has been working perfectly with the ufh.

So are you saying I should take it down even further. 

 

Hi Sand,

The weather compensation needs to be adjusted to match the heat loss of your home. The figures I gave initially were a starting point for further optimisation. 

If you are getting correct temperatures downstairs, then you may have to use TRV's on the upstairs radiators to control the temperatures. If your system has been correctly zoned with the necessary equipment then you should be able to control the zones independently. What equipment do you have on your system?