Setting The Boiler Control Function Modes - Biasi Activ A 25C Service Manual

Main electronic control/ignition p.c.b.
Fig. 9.4
Normally, the result of the comparison between these
two signals directly operates the fan speed adjusting
the useful output generated in order to stabilize the
temperature of the exiting water.
If during the d.h.w. mode operation, the temperature of
the primary circuit goes over 90C, the useful output is
automatically reduced so that the primary circuit can-
not reach excessive temperatures.
The control sequences in
tion are illustrated in detail in sections 9.7 and 9.8.
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.
Fig. 9.5
1 To enter in the parameters setting mode press
contemporary the 3 keys (A --- B --- C Fig. 9.5) for
10 second until the display shows Fig. 9.6
20
90 ˚C
function and in
Fig. 9.6
2 To move trough the parameters press c.h. set
keys (A or C Fig. 9.7)
Fig. 9.7
3 The display shows Fig. 9.8
func-
Fig. 9.8
4 To modify the parameter press contemporary the
keys (A --- B Fig. 9.9)
A
B
C
Fig. 9.9
5 To change the parameters press c.h. set keys (A
or C Fig. 9.7)
6 To memorize the setting press the key (B
Fig. 9.10)
A
C
A
B