Commissioning
33
7.8
Maximum output in c.h. mode
The maximum useful output in c.h. mode of model
can be varied and on model M110.32SM/... is fac-
tory set to 24 kW.
To change the maximum useful output value in
c.h. mode refer to the
electronic control/ignition
pcb
section of the service manual
7.9
External temperature probe
setting (optional)
The external temperature probe (if fitted) allows to
adjust automatically the temperature of the c.h.
flow with reference to the external temperature.
The curves given in the chart of Fig. 7.7 represent
the c.h. flow temperature setting as a function of
the external temperature measured by the exter-
nal temp. probe.
The relationship between the external tempera-
ture and the c.h. flow temperature is represented
by the coefficient K (Fig. 7.7) that can be set be-
tween 0 and 6 as hereafter explained.
E.g. to obtain a flow temperature setting of 60
û
C
when the external temperature is ---5
û
C, K must
be set to 1,5 (dashed line in Fig. 7.7).
20
30
40
50
60
70
80
External temperature
û
C
C.h. flow temperature
û
C
20
15
10
5
0
--- 5 --- 10 --- 15 --- 20 --- 25
K=4
K=3
K=2
K=1
K=0,5
K=1,5
K=6
Fig. 7.7
The appropriate value of the coefficient K de-
pends on the design temperatures of the c.h. sys-
tem as the minimum external temperature and the
corresponding c.h. flow temperature.
The coefficient K is factory set to 0 that is the
setting for the operation with no external tem-
perature probe fitted.
To set the coefficient K:
1 Turn on the electricity supply to the boiler,
switching on the fused spur isolation switch.
2 Set the function knob 8 as illustrated in Fig. 7.8.
8
10
7 6
9
Fig. 7.8
3 Keep pressed the reset button 7 for about 10
seconds until the lock---out signal lamp 6
blinks.
4 The lamps should give the indication as in
Fig. 7.9 (coefficient K setting). If not, press the
reset button repeatedly to obtain it.
Where:
Lamp OFF
Lamp ON
Fig. 7.9
5 To change the setting turn the knob 9 on a posi-
tion corresponding to the desired coefficient K.
By turning the knob 9, the lock---out signal
lamp 6 blinks quickly (2 per seconds) indicat-
ing that the setting has changed and must be
memorised.
Setting No.
Coeff. K
1
4
2
3
5
6
7
0
0,5
1
1,5
2
3
6
4
9
5
Fig. 7.10
6 To memorize the setting keep pressed the
reset button 7 for about 5 seconds until the
lights 10 briefly blinks simultaneously.
7 To reset the boiler to the normal operation turn
it OFF and ON by the function selector knob 8.
INST
ALLA
TI
ON
