Help!! Air source heat pump costs

Mstty

TadleyBaggie said:

Mstty said:

If that was on all this time it could well be the cause, please turn this off and update.

I think she has just found the breaker for the circuit that supplies the immersion heater. It's clearly not switched on else the hot water wouldn't be tepid

Maybe but who mows perhaps a picture will help

Mstty

@Dolor

It has taken us a year to understand our ASHP. Even now our second winter upcoming we have a number of configuration settings to test to get the best efficiency out of our HeatPump. But that is hopefully just fine tuning.

It should not be underestimated how much time it will take, reading, watching and experimenting if you want to run you ASHP as efficiently as possible for your home.

That said there are some very simple steps that are enough for most people and they will be happy not try to save that extra 1000kwh a year with some fettling.

However what can happen, to make ASHP seem like gas CH, installation engineers set the flow temperature too high as otherwise they get called back saying my radiators aren't getting hot. That high flow temp will just eat electricity.

matelodave

If we could find out the make and model of the OP's heatpump and what the controller looks like then perhaps it would be easier to give better answers. Non of us have any idea of how the system is configured nor how it's set up.

It seems that the OP is discovering stuff on a daily basis rather than trying to get a handle on how it is all put together and having a plan to try and sort it out - just guessing and poking wont really come out with a satisfactory conclusion.

I'm guessing but I donl know that if its a Daikin around 15 years old, then it could be a bit like mine which is 12 years old. however that said  mine is a split system with an outside unit and an indoor hydrobox, hers may well be a monobloc wheres all the gubbins is in the outside unit.

Mine has three power feeds, 32amp for the heatpump, 32amp for the 6kw back-up heater and 16amp for the hotwater tank immersion. All three are connected into the heatpump and it has control of which heater is used and when based on how the controller has been set up. There are a lot of parameters that can be set in the engineering menu which affects how these are used and which may or may not be disabled.

The problem being that it's quite possible for the controller to activate either the boost or immersion heaters - just pressing the hot water boost button fires up the immersion unless its disabled or switched off at the mains

Many people have problems with heatpumps because they have their hot water or heating flow temperatures set above 50-55 degrees and it activates the boost and immersion heaters. Both mine are switched off

MrsBeee

The system is a daikin but I don’t know the model of it unfortunately. I think this is only found on the outside fan which isn’t accessible unfortunately. 

I don’t have an inside section like you mention on yours, inside I only have the hot water tank and a boiler. 

The only controls I have are photographed below. This has a timer set which I have now removed as I am turning on and off at the fuse board. 

Someone mentioned I am playing around with it trying to find the best solution without realllt knowing what I’m doing. You’re completely right, I didn’t have the system installed and I’ve never had a such a system before. Everything I know has been from hours of reading online. I have no manuals etc just a basic guide kn the control panel from the previous owner. I have lived in the property two years and I’m still learning everyday. 

I have learned more from this thread than I could have ever imagined and I am so so thankful for everyone’s replies. 

Mstty

In what way is the outside unit inaccessible?

How is it serviced? When was it last services?

Is it overgrown around the unit?

k_man

Mstty said:

In what way is the outside unit inaccessible?

How is it serviced? When was it last services?

Is it overgrown around the unit?

In addition, can you confirm what you mean by boiler:

MrsBeee said:

The system is a daikin but I don’t know the model of it unfortunately. I think this is only found on the outside fan which isn’t accessible unfortunately. 

I don’t have an inside section like you mention on yours, inside I only have the hot water tank and a boiler. 

The only controls I have are photographed below. This has a timer set which I have now removed as I am turning on and off at the fuse board. 

Someone mentioned I am playing around with it trying to find the best solution without realllt knowing what I’m doing. You’re completely right, I didn’t have the system installed and I’ve never had a such a system before. Everything I know has been from hours of reading online. I have no manuals etc just a basic guide kn the control panel from the previous owner. I have lived in the property two years and I’m still learning everyday. 

I have learned more from this thread than I could have ever imagined and I am so so thankful for everyone’s replies. 

matelodave

MrsBeee said:

The system is a daikin but I don’t know the model of it unfortunately. I think this is only found on the outside fan which isn’t accessible unfortunately. 

I don’t have an inside section like you mention on yours, inside I only have the hot water tank and a boiler. 

The only controls I have are photographed below. This has a timer set which I have now removed as I am turning on and off at the fuse board. 

Someone mentioned I am playing around with it trying to find the best solution without realllt knowing what I’m doing. You’re completely right, I didn’t have the system installed and I’ve never had a such a system before. Everything I know has been from hours of reading online. I have no manuals etc just a basic guide kn the control panel from the previous owner. I have lived in the property two years and I’m still learning everyday. 

I have learned more from this thread than I could have ever imagined and I am so so thankful for everyone’s replies. 

Same as mine - the little zig-zag symbol means that you've got the immersion heater activated so you need to ensure that its off - if necessary at the fuseboard. Is the zig zag and shower symbol flashing - if so you've got hot water boost on if not flashing then the immersion is on permanently. I've just had a shuft at mine and can only get the symbol on when I press and hold the hot water button, otherwise a short press just turns the hot water on or off but doesn't activate the immersion.

I have got some info on how to set the timer and stuff - it's not everso easy but you need to stop the immersion and possibly the boost heater from operating. The easy way is to turn them off at the fuseboard but it would be helpful if you can get into the engineering menu and find out how its configured

Just to clarify - you say you've got an outside unit (that the bit with the big fan or fans on it) have you also go summat on the wall that looks like a boiler with the above control panel on the front under a drop down panel. If so you've got a split system and not a monobloc. A split system has the heatpump outside and the internal hydrobox is connected to it by refrigerant piping. The hydrobox contains the heat exchanger, boost heater, circulating pump and a control panel.

Do you have a motorised valve close to the hydrobox plumbed to the hot water tank and the central heating pipework. Try to get a couple of photos to show us what you've got.

I'll see what I can find as I suspect that my unit is much like yours and I'd guess that my settings would be fairly similar. I do have all the installation and commisisoning documents as well as a chart showing my controller engineering settings.

I'm not suggesting that you set it up like mine, but it could be worth comparing settings to see if there are any major differences.

MrsBeee

Mstty said:

In what way is the outside unit inaccessible?

How is it serviced? When was it last services?

Is it overgrown around the unit?

The unit is above ground level. Whilst it’s ground level to the floor in the garage, it’s not from the road. It would need ladders and suitable protection from traffic to be accessed. 

It was serviced 2 years ago. 

It’s not overgrown, no. 

MrsBeee

So the control panel is fixed into a box boiler (looks like a combo boiler box) this is what I’m referring to when I say boiler. Is there a more technical word I should use for this? 

I can turn the immersion heater off at the fuse or breaker. However, just having the boiler on is using energy (figure quoted earlier on thread). Are you recommending I turn the immersion off completely and rely on the ASHP only to heat the hot water? 

The shower icon is flashing, yes. 

I don’t have any idea how to get into the engineering menu. I have never found anything more than basic instructions online. 

I have downloaded the bright app and received the data today. 

I am consistently seeing a 3kw spike between 10 and 11am everyday. Is this the immersion heating the water after our morning showers? Friday I had the whole system off at the fuse. 

See below:  

Mstty

I think you said you had no manuals. This might help with programming and getting into what they call Field settings.

https://my.daikin.eu/dam/document-library/operation-manuals/heat/air-to-water-heat-pump-low-temperature/ekhvh-bb/EKHVH(X)016BB6V3-6WN-9WN_4PWEN64332-1_Operation manuals_English.pdf