Section 8: OperationPage 34
8.2 Weather Compensation
8.2.1 Water Temperature Control Point
The water temperature control point is based on a variable set point
calculated automatically using climatic (weather compensation)
curves as described below.
8.2.2 Heating Climatic Curves
The regulation of the temperature of the outlet water from the heat
pump, in normal winter heating operation, is based on the climatic
curves.
The basic logic is to modulate the temperature of the outlet water
depending on the outdoor air temperature.
During commissioning, the four climatic curve parameters
must be checked and the default values adjusted to suit the
design parameters for the system in question.
For example:
Maximum outgoing (flow) temperature in heating mode (Tm1)
– Parameter 2102, must be set to the design maximum flow
temperature for the system.
Minimum outdoor air temperature (Te1) – Parameter 2104, must be
set to the same value as used in the design heat loss calculations for
the building.
Te1(-4.0°C) Te2(20.0°C) Outdoor air temperature
Outgoing water
set point
Tm1(45.0°C)
Tm2(30.0°C)
Figure 8-4: Climatic curves
Table 8-5: Outgoing water temperature parameters
Level
Parameter
Function description
Display and input value
Remarks
Group Code Default Min. Max. Unit
I 21 00
Enable outgoing water set point
0=fixed set point*
1=climatic curve
1 0 1 -
I 21 01 Fixed outgoing water set point* 45.0 23.0 60.0 0.5°C
I 21 02 Maximum outgoing water temperature in Heating mode (Tm1) 45.0 23.0 60.0 0.5°C
I 21 03 Minimum outgoing water temperature in Heating mode (Tm2) 30.0 23.0 60.0 0.5°C
I 21 04
Minimum outdoor air temperature corresponding to maximum
outgoing water temperature (Te1)
-4 -20.0 50.0 0.5°C
I 21 05
Maximum outdoor air temperature corresponding to maximum
outgoing water temperature (Te2)
20.0 0.0 40.0 0.5°C
I 21 41 Hysteresis of water set point in heating 8.0 0.5 10.0 0.5°C
* Fixed set point - thermal store require temperature sensor
For details of how to access the parameter settings, refer to Section 9.3.
8.2.3 Fixed Set Point
The heat pump is supplied with parameter 2100 set to a default
setting of 1 (Climatic curve operation).
For the heat pump to operate based on a fixed outgoing water set
point parameter 2100 must be reset to 0 (fixed set point).
With parameter 2100 set to 0, the outgoing water fixed set point is
determined by parameter 2101 (factory default value = 45°C).
To stop operation of the weather compensation function, and set the
outgoing water temperature control to ‘fixed set point’, set Parameter
2100 to 0 and parameter 2101 to the required ‘fixed set point’ value.
If the installation is receiving an RHI payment, do NOT set
the outgoing water control to ‘fixed set point’ as the weather
compensation function MUST be operational.
NOTE
!
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