Temperature - Biasi M110B.24SM/C User Manual And Installation Instructions

Instructions for use
Your qualified Installer will be able to recommend
the most suitable adjustment for your system.
The temperature and pressure gauge (4, Fig. 1.3
on page 2) will allow you to check that the set tem-
perature is obtained.
Adjustment of temperature WITH the external

temperature

probe (optional)
When the boiler is connected to the external tem-
perature probe (optional), the temperature of the
c.h. flow is automatically adjusted with reference
to the external temperature.
In this case the boiler must be properly set by the
Installer ( section 7.9 of this manual) and the c.h.
flow temperature control knob 8 must be positio-
ned as illustrated in Fig. 2.8
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8
Fig. 2.8
To satisfy temporary changes or different room
temperatures, the c.h. water temperature can also
be manually increased or decreased within a ran-
ge of ±15 ˚C by turning the knob 8 (Fig. 2.8). Mo-
re details are given in section 7.8 of this manual.
2.5 D.h.w. temperature
Minimum
Maximum
Fig. 2.9
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The temperature of the d.h.w. leaving the boiler
can be varied from a minimum of about 35°C to a
maximum of about 55°C (Fig. 2.9), by turning the
temperature control knob 9.
Adjustment of the d.h.w. temperature is complete-
ly separate from that of the c.h. circuit.
The adjustment system integrated within the
boiler automatically controls the flow of gas to the
burner in order to keep the temperature of d.h.w.
delivered constant, between the limits of maxi-
mum and minimum output.
Where the demand is at a low level or with the tem-
perature set to the minimum, it is normal to see a
cycle of lighting and extinguishing of the burner
when running.
Adjustment
It is advisable to adjust the d.h.w. temperature to
a level commensurate with the demand, minimis-
ing the need to mix with cold water. In this way, the
automatic control facilities will be fully exploited.
Where lime scale is present in the water supply
(hard water areas) it is also advisable not to ex-
+15
ceed the setting position of the d.h.w. temperature
control knob (9) as indicated in Fig. 2.10. This will
help to minimise the incidences of scale deposits
clogging the domestic hot water heat exchanger
of the boiler.
Fig. 2.10
In these cases, however, it is advisable to install a
small water treatment device or softener. With
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such a device you should avoid periodic descal-
ing.
Consequently, the d.h.w. heat exchanger will keep
its performance consistent for a longer period of
time with resulting gas savings.
If the demand for d.h.w. is so great as to prevent
reaching a high enough temperature, have the ap-
propriate output limiting valve installed by your In-
staller or an Authorised Service Engineer.
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