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

lovesgshp

richardc1983 wrote: »

You mean 19c increase from 18c?

Yes, apologies if I did not explain it clearly.

richardc1983

lovesgshp wrote: »

Yes, apologies if I did not explain it clearly.

The way I understood it was that at 19c the house would not cool so much and therefore recovery times should be shorter? MIL says house is nice and warm! I wouldn't be warm enough at those temps personally.

lovesgshp

richardc1983 wrote: »

The way I understood it was that at 19c the house would not cool so much and therefore recovery times should be shorter? MIL says house is nice and warm! I wouldn't be warm enough at those temps personally.

That was what I was trying to explain. A UFH system, can cope easily at 19C, even with a flow temp reduction of 1-1.5C overnight. With rads, flow would be max 4C flow temp reduction.
With the set-up you have, you are using room temperature as the control, so therefore the reason for the pump operating continuously trying to recover to 21C.
But, if MIL is happy then leave as it is!!! She is paying the bills, I hope.

richardc1983

But this is the way they have set it up to operate so not sure of any other way of operating it?

lovesgshp

As there is no other way that I can see at the moment, then you need to get the room thermostat control, at overnight, to a reasonable level. The room temperature is controlling the heat pump totally.
Without me going back into the manual again, can you overide the internal thermostat and set the pump to run on the external air temp setting only?

lovesgshp

Am looking at the installation manual again, can you let me know the pump size for output?

richardc1983

lovesgshp wrote: »

Am looking at the installation manual again, can you let me know the pump size for output?

It is a 14kw Samsung unit, there doesn't seem a way to override the internal temp sensor with the outdoor temp.

lovesgshp

richardc1983 wrote: »

It is a 14kw Samsung unit, there doesn't seem a way to override the internal temp sensor with the outdoor temp.

Ok will see what I can find out, as there should be a way. Please give me a while to look at it.

richardc1983

lovesgshp wrote: »

Ok will see what I can find out, as there should be a way. Please give me a while to look at it.

Sure no worries

lovesgshp

Look at P15 of the manual you emailed me, that gives a lot of info. Set the unit up in test mode, you do need a 17ltm flow rate. Check the filter to make sure it is clean on the heating circuit.