Temperature; Extinguishing - Biasi RIVA COMPACT M90E.24S 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 1) will allow you to check that the set tem-
perature is obtained.
2.5 D.h.w. temperature
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. 2.8), by turning the
temperature control knob 9.
Minimum
Maximum
Fig. 2.8
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.
Moreover, where the amount of limescale present
in the water may be particularly great, not exceed-
ing the position in Fig. 2.9 of the d.h.w. tempera-
ture control knob 9 corresponding to about 50°C
4
(Fig. 2.9), minimises annoying incidences of scale
deposits and clogging.
Fig. 2.9
In these cases, however, it is advisable to install a
small water treatment device or softener. With
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.
9
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.
2.6

Extinguishing

To turn the boiler off set the function selector 8 to
the position shown in Fig. 2.10.
The appliance operation light 10 will flash every 4
seconds.
10
Fig. 2.10
When you do not expect to use the boiler for a long
period:
1 Switch off the electricity supply to the boiler, by
means of the fused spur isolation switch;
2 Shut off the gas supply cock 13 and the valves
for the water circuits fitted under the boiler
(Fig. 2.11).
9
8