Settings
Installation manual – System controller
33
5
To avoid reaching too high temperatures in unexpectedly harsh
climate conditions, we recommend setting the Flow temp set-
point max to a suitable value. As a first general criterion, set
these parameters to a value that ensures the system and build-
ing will not be damaged.
Special care must be taken in the case of floor heating
systems. It is best to ask the system installer and the
flooring vendor for advice, especially for parquet floors.
Moreover, for floor heating systems it is recommended
that the heating be run off a mixed heating circuit.
Furthermore, except for cases in which the system will be oper-
ated exclusively with the auxiliary boiler at high thermal loads
(i.e. the system is intended to run at a higher water temperature
setpoint than the operating limit of the K18 heat pump), we rec-
ommend setting these parameters to no more than 65 °C.
To optimise the heating service with certain room heat exchang-
ers (for example, ducted hot air or fan coil heating) it is often also
worth setting the values of the Flow temp setpoint min param-
eters to ensure sufficient heat exchange in all room conditions.
Since the efficiency of the K18 heat pump (GUE, Gas
Utilization Efficiency) is greater the lower the water tem-
perature, it is good to set these parameters to the lowest
value compatible with the needs of distribution. This en-
ables you get the most out of heating curve operating
mode, and boosts efficiency.
Figure 5�1
Heating curve graph - Each curve plots the outlet temperature against the external room temperature, when the room setpoint temper-
ature is 20°C
Tacq
water temperature
Tamb
external ambient temperature
T amb
T acq
5.1.5
Setting the Room influence and Room
temperature limitation parameters
When a room unit is installed in a heated room (reference room),
it acquires the local temperature and interacts with the control
system. In particular, it may:
1� Modify the outlet water setpoint relative to the heating curve
setpoint. If the reference room temperature stays below the
requested value for too long or reaches it too slowly, the wa-
ter setpoint is gradually increased. In the opposite case, the
water setpoint is gradually decreased. This compensates for
errors in selecting the heating curve or due to particular con-
ditions (variations in the internal thermal load, strong winds,
etc.). This compensating action can be made more or less ef-
fective, to the point of completely substituting the heating
curve system, or it can be disabled entirely. Heating circuit
1 and, if present, heating circuit 2, are preconfigured to use
this function in relation to the included room unit 1 tem-
perature reading, with a mild compensating action (20%),
which is suited to many installations. To modify the degree
of influence, or disable the function entirely:
Select parameter 750 or 1050 (heating circuit 1 or 2
respectively), as described in par. 5.1.1
p. 31 and
5.1.2
p. 32, and set the influence percentage (%),
or - - - to disable the function entirely.
WARNING: Setting a value of 100 % disables the heating
curve. It is best not to use this setting, or even very high
influence percentages. For most applications, do not ex-
ceed a setting of 30 %.
