Maximum Output In C.h. Mode; External Temperature Probe Setting (Optional) - Biasi M110B.24SM/C User Manual And Installation Instructions

Commissioning
ual.
If it does not comply with the required pressure
check the gas supply line and governor for
faults and/or correct adjustment.
Where the boiler is connected to a gas supply
which has a zero set governor then it is necess-
ary under the Gas Safety (Installation and Use)
Regulations 26.9. to perform a combustion
analysis test for CO/CO
boiler is given in section 4.3 and 4.4 Technical
data: CO contents / Other flue gas figures) and
2
complete the Certificate of Exemption section
of the Benchmark.
8 Switch off the boiler close the gas inlet valve
and close the water tap.
9 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.
7.8

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
7.9 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. 7.9 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. 7.9) that can be set be-
tween 0 and 6 as hereafter 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).
36
(The limits for the
2
C.h. flow temperature ˚C
K=6 K=4 K=3
80
70
60
50
40
30
20
20 15 10 5
Fig. 7.9
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. 7.10.
10 9
Fig. 7.10
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. 7.11 (coefficient K setting). If not, press the
reset button repeatedly to obtain it.
K=2
K=1,5
K=1
K=0,5
0 --- 5 --- 10 --- 15 --- 20 --- 25
External temperature ˚C
8 7 6