Biasi Riva Advance Combi Installation & Operation Instructions page 49

15. Commissioning Cont.
the table CO
"Technical Information" page 9.
• Close the domestic hot water cocks.
• Turn off the boiler by positioning selector
7 to " " Figure 15.19.
Figure 15.19
The boiler is set with a K coefficient equal to
zero for boiler operation without a connected
probe.
C.h. flow temperature °F
K=6 K=4
176
158
140
122
104
86
68
68 59 50
Figure 15.20
The K coefficient is a parameter that raises
or lowers boiler delivery temperature as the
external temperature changes.
When the external probe is installed, this
parameter must be set based on the heating
system efficiency to optimise the delivery
temperature (Figure 15.20)
Ex. To achieve a delivery temperature to
the heating system of 140°F (60°C) with an
outdoor temperature of 23°F (-5°C), K must
be set at 1.5 (dashed line in Figure 15.20).
49 RIVA ADVANCE COMBI MANUAL
at Q. min. in the section
2
7
15.7 Setting the external probe K coefficient:
K=3 K=2
41 32 23 14 5 -4
External temperature °F
When checking the minimum and maximum
burner pressures, check the gas flow rate
at the meter and compare its value with the
gas flow rate data see section "Technical
Information" page 9.
Reclose the flue analysis points.
Sequence for setting the K coefficient
• Position the handles 8 and 7 indicated in
Figure 15.21.
K=1,5
K=1
K=0,5
• Electrically power the boiler, the following
-13
will appear on the LCD display.
• To set the K coefficient, which is determined
from Figure 15.22 access programming
by pressing the reset button 6 in Figure
15.2 for 15 seconds until parameter P01
appears on the LCD display; the following
will appear on the LCD display (the
8 7
Figure 15.21
Figure 15.22
6