Ämne: S1156 uptime and best practises

[poker]

Hi,

S1156, Ireland, typical outside temp +5C, had some weeks at -1C in early January. House built 2009, size 350msq. Underfloor on 2 floors.

Recent settings I see it modulates down to low energy but rarely turns off. I understand low and slow is good. Stop start is bad. But should there be more hours of stop and rest?

The demand increases at 3am for hot water session, and then i charge home. In Ireland night rate electricity is 13cent/kw and day rate 25cents, so try to work hard at night.

House temp is good. It can struggle below zero. Machine is S1156, ignore chart title.

[Carl N]

It is a frequency-controlled compressor and is should not stop during winter period.

I would schedule the indoor temperature.
In menu 6.2 you can set the curve offset if you don't have a room sensor, or set up the setpoint for the room sensor.
Just turn it up during the 13 cent period and down the rest of the day.
Make sure that as many of the thermostats is fully open as possible so they don't cut of the temperature rise during night.

[poker]

Ok, so minor change from current approach.

Room thermostats are not integrated back to pump. So I will bump the curve in the night rather than try manage rooms.

So ideally pump never turns off and runs on low, and if it goes off we want it to stay off for a good period?

May need to review degree minute logic

[poker]

I increased curve at night to charge floor. My day time looks like picture. Is this what we want? I don't identify this as short cycle but it is on and off a few times. Mild day 6.5 degrees C.

Maybe in this config my degree minute to trigger on should become a bit more, or what is the optimization?

[Carl N]

It is long cycles, you can keep it as is.
But make sure that the electric heater in the heat pump don't turn on when you raise the kurve durig night.

[poker]

Has S1156 got any passive cooling ability? I know there are ancillary add-on units. They were rather expensive in Ireland.

Outside air temp ~28-30C,

[Carl N]

Has S1156 got any passive cooling ability? I know there are ancillary add-on units. They were rather expensive in Ireland.

Outside air temp ~28-30C,

Yes, this works best with geothermal collector (in bedrock).
You need a fan coil unit and PCS 44 gadgets.

[poker]

Is there a way without adding that? No way to reverse without it?

[Carl N]

Is there a way without adding that? No way to reverse without it?

No, Nibe heat pump can't reverse the cooling circuit.
There is one mark, Daikin, that have this feature.
But that's not passive cooling, it is called activ cooling.