UPDATED: Air Source Heat Pumps/Air Con - Full Info & Guide, is it cheaper to run than mains gas?

offitmassive

Right, manual found, I've read about the dip switch and by looking at the diagram it's in the main wiring box?? So I don't know what position it's in, and it says once temp has been reached, the pumps should turn off to prevent heat loss. The noise is coming from both green wilo pumps. The heat on the water could be like 33c so I flick the extra hour button a few times to get nearer to 50c but will sometimes only get to 38, 40c at most but says in the book it should only take half hour to heat the whole cylinder?

[Deleted User]

offitmassive wrote: »

Right, manual found, I've read about the dip switch and by looking at the diagram it's in the main wiring box?? So I don't know what position it's in, and it says once temp has been reached, the pumps should turn off to prevent heat loss. The noise is coming from both green wilo pumps. The heat on the water could be like 33c so I flick the extra hour button a few times to get nearer to 50c but will sometimes only get to 38, 40c at most but says in the book it should only take half hour to heat the whole cylinder?

Sounds like you have a number of issues to be resolved. Perhaps best to contact the installer or qualified engineer, even the Mits helpline, as it could be something simple like low system pressure to a fundamental requirement/setting being incorrect.


Cheers

matelodave

Ideally you need to know how your system works and how it's set up to be able to get it to do what you want and to obtain the best performance out of it. Unfortunately a lot of systems are just bunged in and the owner/occupier might get given a handbook and then left to get on with it. This is a recipe for disaster and very high energy bills.

Unless you can work your way through the handbook with a fair degree of understanding and know how your heating system works and is configured you really don't have much chance of sorting it out by yourself.
It's even difficult for someone to remotely talk you through it unless you can accurately describe how your heating system has been configured and can sort your way through the controller menus. (by the way ufh = under floor heating).

You'll either have to get the original installer back to set it up and tell you how it works or get either Mitsubishi or one of their accredited installers to come and help.

I know how my Daikin ASHP system works and I have recorded all the settings, so if it all goes to pot, I can check the settings and reset or tweak them if required.

thenudeone

JackMar wrote: »

Thanks for all the comments. We were advised in black and white that we would be saving a £1000 on our bills each year.

How much were you paying for gas each year?
The average house only spends £1k per annum in total on gas (according to http://www.ukpower.co.uk/home_energy/average-energy-bill#.U0woz_m46qg)
so anyone suggesting a saving of £1k would have their work cut out.

BTW if you have a large house with a large heat requirement, you would expect to receive a substantial income from the RHI scheme which went live this month, as long as the installers, equipment, and installation are all MCS registered. (I'm expecting £2-3k income from RHI for my ASHP). Have you taken this income into account?

matelodave

How are you calculating 2-3k from the RHI - is it the total over the seven years or per annum.
I've just put my application in and am waiting with bated breath to see what, if any, I'll get.

offitmassive

matelodave wrote: »

Ideally you need to know how your system works and how it's set up to be able to get it to do what you want and to obtain the best performance out of it. Unfortunately a lot of systems are just bunged in and the owner/occupier might get given a handbook and then left to get on with it. This is a recipe for disaster and very high energy bills.

Unless you can work your way through the handbook with a fair degree of understanding and know how your heating system works and is configured you really don't have much chance of sorting it out by yourself.
It's even difficult for someone to remotely talk you through it unless you can accurately describe how your heating system has been configured and can sort your way through the controller menus. (by the way ufh = under floor heating).

You'll either have to get the original installer back to set it up and tell you how it works or get either Mitsubishi or one of their accredited installers to come and help.

I know how my Daikin ASHP system works and I have recorded all the settings, so if it all goes to pot, I can check the settings and reset or tweak them if required.

ahh i see what ufh means, no i dont have that, im a motor vehicle technician with F gas license so am aware it works in reverse to air conditioning to an extent. and that it draws in the ambient air temperature to change the gas to a liquid (or vice versa?) and this in turn heats the water which is then pumped around the home. I get that bit. i also dont understand why say the temps are preset at 50c but recommended temps for water are 55c? i dont understand either way error code u1 keeps appearing, twice yesterday infact. I dont understand why peter barlow is keeping things going with carla when tina is sniffing around either!

matelodave

You don't have to know how the air pump works but you do need to know how your system is configured, where the pumps & motorised valves fit into the system, how they are wired and how they are controlled by the controllers. Which ones should be running and when and what positions the valves should be in when they are. What the settings do and what the fault codes mean. Without that knowledge, either in your head or in a handbook you won't know what's right and what's wrong and you won't be able to locate faults or identify any wrong settings or misoperation
I'd guess that if the preset temp is 50 degrees and the water temp is set to 55 then the back-up immersion kicks in to give the extra 5 degrees. That's what I mean about understanding how it works, not strange comments about people I've never heard of.

thenudeone

matelodave wrote: »

How are you calculating 2-3k from the RHI - is it the total over the seven years or per annum.

It's per annum.

My EPC states an energy usage of 67,000kwh pa :eek::eek:

Assuming a legacy COP of 2.5, 60% of this will be renewable (1.5/2.5)
= 40,200 kwh pa
x 7.3p/kwh
= £2,934 pa

I hope.:o

Cardew

I dont understand why peter barlow is keeping things going with carla when tina is sniffing around either!

matelodave wrote: »

not strange comments about people I've never heard of.

must be a soap????

matelodave

thenudeone wrote: »

It's per annum.

My EPC states an energy usage of 67,000kwh pa :eek::eek:

Assuming a legacy COP of 2.5, 60% of this will be renewable (1.5/2.5)
= 40,200 kwh pa
x 7.3p/kwh
= £2,934 pa

I hope.:o

I think that's a bit optimistic I don't think it's the EPC estimate that they use.
It's either based what you actually produce if you've got a heat meter or the projected amount detailed on your MCS certificate. So try the calculation on the MCS figure to see if it's as good. I hope you aren't going to be too disappointed:(