85
4.1 TEMPERATURE
ADJUSTMENT OF D.H.W.
The sistem with a potentiometer for adju-
sting the temperature of D.H.W. with a set-
ting range from 40° to 60°C offers a dou-
ble advantage:
1) The boiler adapts perfectly to any type of
D.H.W. system, whether the mixing
system is a mechanical or a thermostat-
controlled type.
2) The thermal output is dosed according
to the temperature required, which
means a considerable saving in fuel.
NOTE: In order to avoid any misunder-
standing please remember that the value
obtained by the product of temperature
difference (in °C) between D.H.W. output
and input into the boiler by the hourly
flow rate measured on the tap, where
hot water is drawn off (l/h), cannot be
higher than the useful output developed
by the boiler. For measurements and
checks on flow rate and temperature of
D.H.W., use suitable instruments, taking
into consideration any heat dispersion
along the stretch of piping between the
boiler and the measuring point.
4.2 ADJUSTMENT OF
D.H.W. FLOW RATE
To adjust the hot water flow rate, use the
flow-rate regulator on the pressure switch
valve (5 fig. 7). Remember that the flow
rates and corresponding temperatures of
use of hot water, given in section 1.3, have
been obtained by positioning the selector of
the circulation pump on the maximum value.
Should there be any reduction in the
D.H.W. flow rate, the filter installed on the
inlet to the pressure switch valve (3 fig. 7)
will need cleaning.
4.3 ADJUSTMENT OF HEAT
OUTPUT FOR HEATING
To adjust boiler heat output for heating pur-
poses, i.e., modifying the setting made at the
factory which is approximately 16 kW, use a
screwdriver to adjust the heating heat output
trimmer (1 fig. 21). To increase working pres-
sure, turn the trimmer clockwise; to reduce
pressure, turn the trimmer counterclockwise.
To facilitate the operations of adjusting heat
output, see the pressure/heat output dia-
grams for natural gas (methane) and butane
or propane gas (figg. 27 - 27/a - 27/b).
4.3.1 Measuring the gas
nozzles pressure
Connect the pressure column or a pressu-
re gauge to the pressure inlet downstream
of the gas valve (3 fig. 28 - 4 fig. 28/a).
In the “BF TS” versions, instead, connect
the manometer as shown in fig. 28/b.
4 USE AND MAINTENANCE
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