Benjseb

New 14kw Ecodan install

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The week has finally arrived to have our old oil boiler and a huge 500L water tank ripped out and a new AHSP installed :)

Can't wait - especially as we now have no hot water until it's connected!

 

So far the oil tank has been removed, we've dug a big trench to lay the pre-insulated pipe into, and the old Whitebird 120/150 oil boiler is going on eBay!

 

Hopefully today the cylinder will be in so we can have a warm shower, then everything else will get connected up and commissioned tomorrow

 

 

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Wow, bet you are looking forward to that!

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I am!

 

 

We’re  getting there. Tanks and water filters (chlorine/etc) in today. 

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was it not possible to site the ashp closer to avoid long pipe runs?

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No not really. The house is quite picturesque from the front and it would be right near the front door. At the back it’s a  north facing courtyard so not ideal due to sound and cooler temps. 

 

We we didn’t really want the heat pump smack bang in the middle of the house layout so it’s gone where the oil tank was. Using pre-insulated buried pipes so hopefully heat loss will be minimal. 

 

 

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2 minutes ago, Benjseb said:

At the back it’s a  north facing courtyard so not ideal due to sound and cooler temps

Can't comment on sound, but air temperature will be the same on north or south side of house unless you have a massive heat trap due to local conditions. Also, my ASHP external unit has a temperature sensor which is used for compensation control purposes. Siting it on the north side will prevent false readings due to direct solar on the casing.

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Just now, ragg987 said:

Can't comment on sound, but air temperature will be the same on north or south side of house unless you have a massive heat trap due to local conditions. Also, my ASHP external unit has a temperature sensor which is used for compensation control purposes. Siting it on the north side will prevent false readings due to direct solar on the casing.

 

Yes it’s primarily due to it being a courtyard with walls all around and neighbours bedroom nearby so didn’t want  the sound bouncing off the walls at night. 

 

I know they are quite quiet now but when amplified and reflected we didn’t want to risk annoying people!

 

it would also have needed a run of pipe probably 4-5m anyway compared to 8-9 now. 

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And we're done, all installed and working :)

 

We've not had an oil boiler since May so glad it's in! use in time too by the looks of the news with the Saudi oil strikes.

 

Great that we're fully pumped now and not on the horrible gravity fed system we had - so many air blockages previously!

 

Now to try out the underfloor heating!

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Quick question...

 

 

Is it usual on these systems to have the heat pump keeping the flow temp to our set temperature, 24/7, even when all the heating zones aren't calling for heat?

 

Seems the room stats link to the zone valve/pump for that zone, but don't interface with the Ecodan in any way. So if our rooms are all at 20c, with the stats set to 18c, even if no heat is called for all day, the ecodan is still spinning up to keep the flow temp to 40c for instance. Understandably this water shouldn't change much with no heating load, but seems a waste to be continually circulating the water from the heat pump to the buffer tank when no demand?

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Sounds like a lazy installer.  One that was fitted to a house I wired 2 years ago (HP installed by local renewables company) they were too lazy to bother connecting the "call for heat" contact from the UFH manifold.

 

You would have to read the manual, but there are a pair of call for heat input terminals to connect to, and you probably have to change a software setting to make it look at that input.

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First coldish day today as the outside temp dipped to 3c this morning and about 5c this eve

 

Everything is toasty at 19c.  we can really tell the difference between the lounge which has radiators and the other rooms with UFH. They don’t seem to call for much heat at all as the tiles just gently give off some heat after turning off. 
 

The lounge takes a lot longer to warm up. Might have to do some extra draughproofing and add some thick curtains so we can keep the flow temp low But it’s still within design specs 

 

It’s   currently running at 42c this eve which I’m happy for as we specced it to run at 50c at -2.5c so about right. 

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Yep they are upsized. It still take a lot longer to warm up though than the UFH which is probably 4x bigger than needed 

 

so just a case of one working more effectively than the other really. They should all still kick out the heat needed. 

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