Readjusting, venting, collector side
Level vessel
2/3
LEK
LEK
LEK
2/3
LEK
Gamla bilder, med säkerhetsventil på nivåkärlet
1/3
1/3
Check the fluid level in the level vessel
(CM2). If the fluid level has dropped, top
up the system.
1.
Close the valve under the vessel.
2.
Disconnect the connection on top of
the vessel.
3.
Fill with brine until approx 2/3 of the
vessel is full.
4.
Reconnect the connector at the top of
the vessel.
5.
Open the valve under the vessel.
If the pressure in the system needs to be raised, this is
done by closing the valve on the outgoing main line
when the brine pump (GP2) is in operation and the level
vessel (CM2) is open, so that liquid is drawn down from
the vessel.
Expansion vessel
If a pressure expansion vessel (CM3) is
used instead of a level vessel, the pressure
level is checked with the pressure gauge
(BP6). If the pressure drops, the system
should be replenished.
Setting the heating
curve
In menu Curve, heating you can view the heating curve
for your house. The task of the curve is to give an even
indoor temperature, regardless of the outdoor temper-
ature, and thereby energy efficient operation. It is from
this curve that the F1145 determines the temperature
of the water to the climate system (the supply temper-
ature) and thus the indoor temperature.
CURVE COEFFICIENT
The slope of the heating curve indicates how many de-
grees the supply temperature is to be increased/reduced
when the outdoor temperature drops/increases. A
steeper slope means a higher supply temperature at a
certain outdoor temperature.
20
0 10 0 -10 -20 -30 -40
30
40
50
60
70
80
Framledningstempereratur
(°C)
Utetemperatur
(°C)
Steeper curve slope
Supply temperature
Outdoor temperature
The optimum curve slope depends on the climate con-
ditions in your location, whether the house has radiators,
fan coils or underfloor heating and how well insulated
the house is.
The heating curve is set when the heating installation
is installed, but may need adjusting later. Normally, the
curve will not need further adjustment.
CURVE OFFSET
An offset of the heating curve means that the supply
temperature is changed by the same amount for all
outdoor temperatures, e.g. a curve offset of +2 steps
increases the supply temperature by 5 °C at all outdoor
temperatures.
20
0 10 0 -10 -20 -30 -40
30
40
50
60
70
80
Framledningstempereratur
(°C)
Utetemperatur
(°C)
Offset heating curve
Supply temperature
Outdoor temperature
SUPPLY TEMPERATURE – MAXIMUM AND
MINIMUM VALUES
Because the flow line temperature cannot be calculated
higher than the set maximum value or lower than the
set minimum value the heating curve flattens out at
these temperatures.
35Chapter 6 | Commissioning and adjustingNIBE F1145
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