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11 - OPERATING
11.10 - Adjusting
the heating
capacity
This boiler has been engineered
with an "intelligent" micro-processor
control that will adjust the heating
output to match the system demand.
To maximize the effectiveness of the
system, the parameters
the "Installers menu", in section 12.17,
can be adjusted set the maximum
heating output to the effective
maximum load necessary for the
system. The
parameter can be
adjusted from 100 (factory set value),
to 1. The correspondence between
value and heating output is given by
table in fi gure 36.
NOTE: This setting, adjusts the
heating input only. The domestic
output is always 160,000 btu/hr for
every
value.
*Factory set heat input. To adjust see section 11.10
Figure 36 -
Correspondence table to set space heating
11.11 - Domestic
hot water fl ow rate
adjustment
The volume of domestic hot water
that the boiler can produce, depends
on the fl ow rate of the domestic water
system. If the fl ow rate is too high,
the water will move through the heat
exchanger without being adequately
found in
heated. It is therefore advisable to
carry out the following adjustments:
1. switch the on/off power switch, item
"34" in fi gure 1, to "on";
2. adjust control "32" as shown in
fi gure 1, to 130 °F (50 °C);
3. fully open a hot water faucet. If a
mixing type faucet with single lever
is opened, the position must be
fully to HOT;
4. set the mixing valve (item "10" of
fi gure 13 to its maximum values)
5. wait 5 minutes for the temperature
to stabilize;
6. if the water temperature is too
low, reduce the water fl ow using a
fl ow restrictor (item "12" of fi gure
13) until reaching the desired
temperature (turn the fl ow restrictor
in small increments and wait for the
temperature to stabilize to prevent
overshooting the desired value) .
NOTE: Water fl ow should generally
be regulated according to the
values given in section 14, under
the heading "instantaneous d.h.w.
production (rise 75 °F (42 °C))".
11.12 - Cold start
boiler
The boiler has a "cold start" mode.
Any time the room thermostat opens,
(no call for heat) the burner stops
immediately. However even with the
room thermostat contact open, the
boiler will still run for freeze protection
as described in section 12.14.
input
43
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