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• Switch off the boiler close the gas inlet
valve and close the water tap.
• Disconnect the pressure gauge and close
the Inlet Pressure Test Point 42 (Fig. 7.7).
Important: after the checks all of the test
points must be sealed.
7.9
Maximum output in c.h. mode
The maximum useful output in c.h. mode
of model can be varied and on model
M110B.32SM/... is factory 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.
7.10 External temperature probe
setting (optional)
The external temperature probe (if fitted) al-
lows to adjust automatically the temperature
of the c.h. flow with reference to the external
temperature.
The curves given in the chart of Fig. 7.9 rep-
resent the c.h. flow temperature setting as a
function of the external temperature meas-
ured by the external temp. probe.
The relationship between the external tem-
perature and the c.h. flow temperature is
represented by the coefficient K (Fig. 7.9)
that can be set between 0 and 6 as hereaf-
ter explained.
E.g. to obtain a flow temperature setting
of 60°C when the external temperature is
-5°C, K must be set to 1,5 (dashed line in
Fig. 7.9).
COMMISSIONING
C.h. flow temperature °C
80
70
60
50
40
30
20
20
Fig. 7.9
The appropriate value of the coefficient K
depends on the design temperatures of the
c.h. system as the minimum external tem-
perature 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 temperature probe fitted.
To set the coefficient K:
• Turn on the electricity supply to the boil-
er, switching on the fused spur isolation
switch.
• Set the function knob 8 as illustrated in
Fig. 7.10.
Fig. 7.10
• Keep pressed the reset button 7 for about
10 seconds until the lock-out signal lamp
6 blinks.
• The lamps should give the indication as in
K=6
K=4
K=3
K=2
15
10
5
0
--- 5 --- 10 --- 15 --- 20 --- 25
External temperature °C
10
9
8
K=1,5
K=1
K=0,5
7 6
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