Normal operation
Installation, use and maintenance manual – K18 Simplygas
47
6
1. Set the flow water temperature according to the expected
minimum outdoor temperature (for instance: Twater = 60 °C
when Toutside = -10 °C).
2. Using the chart in Figure 6.1 p. 47, select the curve that
meets the above requirement (in the specific case curve with
slope 1.5).
3. Multiply the slope of the selected curve by 100 and set
the figure thus obtained in menu 3 parameter 228 (in the
example set parameter 228 to value 150).
If no curve passes through the established point, select
an intermediate figure between those of the curves
immediately above or immediately below this point.
Indicatively, a system that uses floor radiant heat ex-
changers will use "low" slope figures, a fan coil system
will use “medium” figures and a system with radiators
"high" figures.
4. Ensure parameter 229 (heating curve offset) of menu 3 is set
at 0.
5. Set parameter 230 (room setpoint with climatic curve) of
menu 3 to the desired value (default setting 20 °C).
Unit operation is based on the heating curve ONLY if the
setting of parameter 225 (menu 3) is at 1 (default setting
- see Table 5.3
p. 38).
If the slope of the selected curve is not correct the following
cases may occur, to be assessed during early operation of the
system:
▶
Ambient temperature lower when outdoor temperature is
lower: in this case, the slope of the curve is not sufficient, it
is needed to set a higher value for parameter 228, indicating
the slope of the curve.
▶
Internal ambient temperature is higher when the outdoor
temperature is lower: in this case the curve slope is exces-
sive, a lower figure must be set for parameter 228 indicating
curve slope.
If however the slope is correct (stable internal ambient temper-
ature when the outside temperature changes), but the internal
temperature does not match the setpoint one, the following cas-
es may occur:
▶
Internal ambient temperature is always higher than the set-
point: in this case one must act on the Offset parameter of
the heating curve, setting a negative figure equal to the in-
ternal temperature deviation from the setpoint; for instance,
if the setpoint is 22 °C and the actual internal temperature is
24 °C, set the Offset parameter (parameter 229) to -2 °C.
▶
Internal ambient temperature is always lower than the set-
point: in this case a positive figure must be set for the Offset
parameter of the heating curve; for instance, if the setpoint
is 20 °C and the actual internal temperature is 19 °C, set the
Offset parameter (parameter 229) to 1 °C.
Figure 6.1
Heating curves for internal ambient temperature = 20 °C
Tacq
Water temperature
AmbT Outdoor ambient temperature
Tamb
Tacq
6.6.2
How to raise/lower the water temperature
setpoint (fixed setpoint)
The water temperature set-point establishes the outlet temper-
ature to the system (water output from the appliance), or inlet
from the system (water input in the appliance). The temperature
is pre-set by the TAC upon first start-up.
The water setpoint is set on outlet by default.
Fixed setpoint regulation is used if parameter 225 is set
to 0.
In general, regulation based on heating curve, described
in Paragraph 6.6.1
p. 46, provides better results in
terms of comfort and efficiency. Contact Robur technical
Support before changing the regulation mode.
To raise/lower the water temperature setpoint, through
the GHP10/GHP11 board, proceed as follows (see also
Paragraph 6.5
p. 45):
1. Access menu 3 parameter 225 (= setpoint origin) with
keys
and
; set parameter 225 to 0 (fixed set-
point - see Table 6.1
2. Set parameter 226 (fixed setpoint in heating operation)
to the desired temperature setting.
