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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 25 and "9.8 Thermal control in the
on page 26.
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.
Figure 9 .5
1 To enter in the parameters setting mode press sequentially
the 3 keys "B - C - A" (Figure 9.5) and hold in for 10 second
until the display shows Figure 9.6.
Figure 9 .6
2 To move through the parameters press C.H. set keys ("A" or
"C" Figure 9.7).
Figure 9 .7
3 The display shows Figure 9.8.
Warning: You must wait for a period of at least 8
seconds after you have stored your last P .C .B . ad-
justment before you turn the boiler off or exit the
setting mode using the same 3 keys you used to
enter the mode as described above .
- 22 -
MAIN ELECTRONIC CONTROL/IGNITION P.C.B.
and
in function are
A
B
C
A
C
mode"
Figure 9 .8
4 To modify the parameter press contemporary the keys ("A -
B" Figure 9.9).
Figure 9 .9
5 To change the parameters press C.H. set keys ("A" or "C"
Figure 9.7).
6 To memorize the setting press the key ("B" Figure 9.10).
Figure 9 .10
7 To exit for setting without modifying the set press the keys
("B - C" Figure 9.11).
Figure 9 .11
To reset the boiler to the normal operation press contemporary
the 3 keys ("A - B - C" Figure 9.5) for 10 second.
The following table gives details of each parameter and the pos-
sible value that can be set.
Important: at the end of the setting operation it is important
to fill/update the table in the installation manual see chapter
COMMISSIONING section: Setting record .
A
B
B
B
C
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