@pooneil Hi. It’s a nice problem to have 😁. Do you know if the system is running using weather compensation?  It’s called water law by Samsung

Posted by: @bontwoody

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@pooneil Hi. It’s a nice problem to have 😁. Do you know if the system is running using weather compensation?  It’s called water law by Samsung

Hi. I did wonder if complaining it was working too well on 1st April might look like a joke 😃 

Yes, I believe it is using weather compensation... at least I recall seeing 'water law', but had no idea what that referred to. Again, user information seems deliberately vauge and confusing. 

While I was working there today I turned a couple of the downstairs rad stats right down -- I was in a t-shirt with all the windows open -- and got a E911 error. A flow issue apparently. This happened before, just after the system was first turned on, because the installer had forgotten to open all the check valves. 

This is my concern, with tenants moving in, that they will be fussing with it for comfort and worrying about bills and I'll be forever having to deal with resetting it.

Generation and consumption for January, mainly on Outing Mode was:

Generation 790.5 kWh

Consumption 192.8 kWh

Does that sound about right for a 90 sqm 3 bed house?

Posted by: @pooneil

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Posted by: @bontwoody

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@pooneil Hi. It’s a nice problem to have 😁. Do you know if the system is running using weather compensation?  It’s called water law by Samsung

Hi. I did wonder if complaining it was working too well on 1st April might look like a joke 😃 

Yes, I believe it is using weather compensation... at least I recall seeing 'water law', but had no idea what that referred to. Again, user information seems deliberately vauge and confusing. 

While I was working there today I turned a couple of the downstairs rad stats right down -- I was in a t-shirt with all the windows open -- and got a E911 error. A flow issue apparently. This happened before, just after the system was first turned on, because the installer had forgotten to open all the check valves. 

This is my concern, with tenants moving in, that they will be fussing with it for comfort and worrying about bills and I'll be forever having to deal with resetting it.

 

With tenants I'd be tempted to remove the trv heads, set it up to run on water law only, adjust the water law and leave.  (Otherwise you will likely get 911 errors when they turn down the trvs.). Which is anyway a good way to run a heat pump.

That said you seem to be getting a good cop (energy produced/energy consumed) with it running part time which is encouraging.

OK, so the low flow error could well be because you are closing radiators stats down, I think. Its certainly not the way to control your heat pump.

If weather compensation is active then you need to reduce the two set point temperatures. this is in the installer menus.

Firstly though do some reading to understand how weather compensation works. Basically you set two flow temperatures for two outside air temperatures. For example when its minus 2C outside your flow temperature might be 45C and when its 15C outside your flow temperature might be 35C. Between these two outside temperatures the controller interpolates to find the correct flow temperature.

Once you get this right you really wont need to use radiator stats at all, but there is a bit of trial and error.

Ill have a look for some links to help you.

@pooneil This is how to alter the water law settings

@pooneil Hi and welcome.

I have to say you are thinking like a gas boiler and heat pumps don’t work well being treated that way. It’s best that you sort it before you have tenants and then you can guide them. There’s a document called ABC of heat pumps on this site and you should start by reading that.

The controls you write about are suitable for a gas system and possibly the pump settings may be too. You need to set the TRVs to fully open, the room thermostats to above what anyone might want, say 24C. Then the pump has always got water flowing and not show flow errors.

Then you need to balance the radiators using the lock-shield valves to give an even heat throughout the house. There’s a guide to that too in this forum.

The radiators should NEVER be hot, ours are barely warm so your plumber may have used set flow temperatures limits more appropriate for a gas boiler.

The away mode on our Vaillant uses about half the electricity than normal to keep the temperature about 3C less than normal.

Other Samsung users will best guide you on detailed settings but the principles are the same for all.

The pump may be too big for the house now that you have improved the insulation. 
Well done for insulating the house well and putting in a pump. At the present 15C it will barely need to run at all but you must keep the water flow up and all the radiators open.

Where has the control been mounted? Hopefully inside the house in a normally used room?

@pooneil   I too have a heat pump in a house which is rented out, this was a nightmare as every tenant wanted a different temperature regime to suit their needs, a constant cause of trouble. To overcome this I installed a Homely, which meant the tenants, or you could easily alter the temperature requirements remotely via an app which can be on everybody's phone, with an added advantage that the Homely is easy to use with time-of-use tariff.

JamesPa
The flow error issue is almost certainly from shutting the TVRs off. I'll see if I can get it balanced and comfortable before thinking about taking them off.

bontwoody
Thanks for the video link. I've adjusted it to what he advised for a well insulated house. I'll check tomorrow to see if it makes any difference.

Judith
I'm definitely still in the gas boiler mindset, it's all I know. Living in a draughty house where we can't afford to have the heating over 18°, I'm not used to a constant 25° 😃
Opening all the bedroom TRVs reduced the downstair radiator temperatures, which makes sense as the heat is distributed over a larger area, but it didn't noticeably increase the bedrooms as I'd expect with gas. Again, the mindset of operating gas heating at 70°.

Potatoman
That's interesting to know. I'll investigate the Homely. The only controller is in the cupboard attached to the water tank. I asked the installer about a roomstat and he advised I didn't need one, especially with tenants, because they would more likely be turning it up, down, on and off which was not the best way to run a heat pump. He advised using the +5 and -5 and the Outing setting on the controller if needed. This made sense, assuming it's ticking over correctly 

Thanks again everyone. 

Posted by: @potatoman

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@pooneil   I too have a heat pump in a house which is rented out, this was a nightmare as every tenant wanted a different temperature regime to suit their needs, a constant cause of trouble. To overcome this I installed a Homely, which meant the tenants, or you could easily alter the temperature requirements remotely via an app which can be on everybody's phone, with an added advantage that the Homely is easy to use with time-of-use tariff.

This is where the control philosophy adopted by Vaillant (and some others, mainly European) wins.  They give you a 'room temperature' adjustment, but behind the scenes it actually adjusts the flow temperature by moving the WC curve up or down.  This works even if you disable 'room influence' entirely so you are operating open loop on pure WC.

You have had good advice so far, but I am just wondering what your thermostat is?  What unit is telling the heat pump the desired temperature or when to come on? 

I ask because if the installers have a third party thermostat controlling when the pump comes on etc, then that might cause problems.