Instruction manual

44
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 found in
the “Installers menu”, in section 12.11,
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 figure 39.
NOTE: This setting, adjusts the
heating output only. The domestic
output is always 160,000 btu/hr for
every value.
Figure 39 - Correspondence table
to set space heating output
11.11 - Domestic
hot water flow rate
adjustment (45WN
and 45WE models
only)
The volume of domestic hot water that
the boiler can produce, depends on the
flow rate of the domestic water
system. If the flow rate is too high, the
water will move through the heat
exchanger without being adequately
heated. It is therefore advisable to
carry out the following adjustments:
 switch the on/off power switch, item
34 in figure 1, to “on”;
 adjust control “32” as shown in figure
1, to 130 °F (50 ° C);
 fully open a hot water faucet. If a
mixing type faucet with single lever
is opened, the position must be fully
to HOT;
 set the mixing valve (item “10” of
figure 16 to its maximum values)
 wait 5 minutes for the temperature to
stabilize;
 if the water temperature is too low,
reduce the water flow using a flow
restrictor (item “12” of figure 16) until
reaching the desired temperature
(turn the flow restrictor in small
increments and wait for the
temperature to stabilize to prevent
overshooting the desired value) .
NOTE: Water flow 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 12.8.
11 - OPERATING