Biasi M275V.2024 SM, Service Manual

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MAIN ELECTRONIC CONTROL/IGNITION P.C.B.
When the boiler functions in D.H.W. (Figure 9.4), the signal com-
ing from the D.H.W. temperature probe is compared with the sig-
nal given by the control panel through the adjustment made by
the user (key ).
Figure 9 .4
90 °C
Normally, the result of the comparison between these two signals
directly operates the fan speed adjusting the useful output gen-
erated in order to stabilize the temperature of the exiting water.
If during the D.H.W. mode operation, the temperature of the pri-
mary circuit goes over 90°C, the useful output is automatically
reduced so that the primary circuit cannot reach excessive tem-
peratures.
The control sequences in function and in function are
illustrated in detail in sections "9.7 Thermal control in the
mode" on page 26 and "9.8 Thermal control in the mode"
on page 27.
9 .4 Setting the boiler control function modes
It is possible to select the various boiler control function modes
hereafter named “parameters” by using the keys of the control
panel p.c.b.
1 To enter in the parameters setting mode press at the same
time the 2 keys "F" and "G" (Figure 9.5) and hold in for 5 sec-
ond until the display shows Figure 9.6.
Figure 9 .5
A
B
C
D
E
F G
Figure 9 .6
bar
RESET
2 Scroll the various menus using keys "A" or "B" (Figure 9.5)
until the LCD display indicates the letters Cod , indicating en-
try into “parameter Cod” (Figure 9.7), and then displays three
dashes “ - - - ”.
Figure 9 .7
bar
RESET
3 To enter the selected menu:
• Press the "E" button to set “ 2 - - ”, then press "A" to confirm
the 2 and go to the next segment.
• Press the "E" button to set “ 2 7 - ”, then press "A" to confirm
the 7 and go to the next segment.
• Press the "E" button to set “ 2 7 5 ”, then press "A" to confirm
the 5 and go back to the list of parameters.
• The code P10 appears on the display, indicating entry into
“parameter P10” (Figure 9.8).
Figure 9 .8
bar
RESET
4 By using buttons "D" or "E" (Figure 9.5) it is possible to modify
the value of parameter P10 (Figure 9.9).
03 = M275V.2024 SM
04 = M275V.2428 SM
05 = M275V.2832 SM
Figure 9 .9
bar
RESET