Nibe 1220 GSHP settings - please help.

antbon

Hi
Really hope someone can help me out..
We've got a house with a Nibe 1220 GSHP installed,I'll be honest i haven't got a clue how to use it.....its either too hot, too cold, no hot water, large bills etc.
We've got a reasonable sized open plan house, the bedroom upstairs all have thermostats (no thermostats downstairs)
I just want the house reasonable warm (not too hot) and some hot water.
I've taken a reading from all current settings as they stand now, does anyone know if they are correct ? 
Ideally if some one explain what they mean in laymens terms i.e co-efficient? off set heating curve ? brine in/out ? brine return ? what are the values in brackets ?
I'd like some base values / settings to work from and some instructions on how to adjust things to make the house warmer / colder.

Many many thanks to any help given

1.0) Hot Water Temp      :     55.0
1.1) Period HW/Total     :     30 (60) min
1.2) Time Period             :     60min
1.3) Max Time HW period     :     30min
1.4) HW Temp / Start Temp   :     51.4 (45)
1.5) HW Temp / Stop Temp   :     51.1 (50)

2) Flow Temperature               :     25.9 (30)
2.1) Curve Co-efficient           :     5
2.2) Offset heating curve        :     0

4) Outdoor temperature          :     6.7C

5) Brine In/Out                       :     84.3/91.2
5.1) Brine return temperature Min  :    91.2 (6)
5.2) Auto reset brine alarm     :      On
5.3) Time between starts        :      45min
5.4) Compressor Start            :       -55

soundskin

temps in the brackets are the target temps.

The heat curve is your main point of call for adjusting your heating. Be aware too many stats is a bad thing for a heat pump.

Most of your settings are fine. You'd have to get into the service menus to go digging properly

1.0) Hot Water Temp : 55.0 ok
1.1) Period HW/Total : 30 (60) min ok
1.2) Time Period : 60min ok
1.3) Max Time HW period : 30min ok, usually set to 20
1.4) HW Temp / Start Temp : 51.4 (45) (45 is the start
1.5) HW Temp / Stop Temp : 51.1 (50)

2) Flow Temperature : 25.9 (30)
2.1) Curve Co-efficient : 5 this is where you adjust your heating
2.2) Offset heating curve : 0

4) Outdoor temperature : 6.7C

5) Brine In/Out : 84.3/91.2 these figures are incorrect as sensors are failed, not an issue to affect the running of the heat pump
5.1) Brine return temperature Min : 91.2 (6) This is usually minus 8 degrees and not 6
5.2) Auto reset brine alarm : On
5.3) Time between starts : 45min
5.4) Compressor Start : -55

antbon

Hi, Thanks very much for the reply
I'll make the adjustments you have suggested - thank you.
If you don't mind, what is the relationship between the 'Offset heating curve' and the 'Curve Co-efficient'

antbon

Still just wondering if anyone could explain what the relationship between the 'Offset heating curve' and the 'Curve Co-efficient' is ?
Thanks

antbon

Still just wondering if anyone could explain what the relationship between the 'Offset heating curve' and the 'Curve Co-efficient' is ?
Thanks

rathbaner

The relationship is discussed in the manual here. http://www.nibe.eu/nibedocuments/14052/231651-1.pdf

From what I can gather a relationship is maintained by the unit between the indoor temperature and the outdoor temperature. This is based on a theoretical model based on an ideal house. In real life conditions this relationship (which is expressed mathematically as a curve) has to be offset to take into account these real life factors. The amount which it is offset is the coefficient.