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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
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
illustrated in detail in sections "9.7 Thermal control in the
mode" on page 26 and "9.8 Thermal control in the
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.
- 22 -
MAIN ELECTRONIC CONTROL/IGNITION P.C.B.
90 °C
and
in function are
A
B
Figure 9 .5
Figure 9 .6
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
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).
mode"
Figure 9 .8
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
G
F
E
D
C
RESET
bar
RESET
bar
RESET
bar
RESET
bar
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