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4
USE AND MAINTENANCE
THE BENCHMARK INITIATIVE
All relevant sections of the logbook must be
filled in at the time of installation and there-
after service information on the back page
of the logbook.
Commissioning of the boiler is not complete
until the logbook is filled in.
4. 1
TEMPERATURE
ADJUSTMENT OF D.H.W.
The system with a potentiometer for adjust-
ing the temperature of D.H.W. with a setting
range from 35° to 60°C offers a double
advantage:
1) The boiler adapts perfectly to any type of
D.H.W. system, whether the mixing sys-
tem 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 misunderstanding
please remember that the value
obtained by the product of temperature
difference (in °C) between D.H.W. out-
put and input into the boiler by the
hourly flow rate measured on the tap,
where hot water is drawn off (l/h), can-
not be higher than the useful output
developed by the boiler.
4.2
ADJUSTMENT OF
D.H.W. FLOW RATE
To adjust the hot water flow rate, use the
flow-rate regulator on the divertor valve.
Remember that the flow rates and corre-
sponding 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 (9 fig. 7) will need
cleaning.
To access the filter, you must first turn off
the cold domestic water tap assembled on
the template.
4.3
GAS VALVE
The boiler, is equipped standard with the
HONEYWELL VK 8115M gas valve (fig. 19).
4.4
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 17 kW, use a
screwdriver to adjust the heating heat out-
14
5
2
1
4
3
KEY
1
Regulation intake
2
EV1-EV2 coils
3
Pressure inlet upstream
4
Pressure inlet downstream
5
Regulator
put trimmer (14 fig. 16).
To increase working pressure, turn the trim-
mer clockwise; to reduce pressure, turn the
trimmer counterclockwise.
To determine boiler heat output setting,
check energy consumption by observing the
meter and then compare with the values
shown in Table 4 - 4/a; or measure "air ∆p"
with a digital pressure gauge connected up
as shown in fig. 20. Compare values with
those shown in Table 4 - 4/a.
4.4. 1
Diagram illustrating heat output in relation to "air ∆p" version "90 A"
30
25
20
15
10
5
0
TABLE 4
Variable heat output
(80-60°C)
(50-30°C)
kW
kW
24.5
26.9
18.7
20.6
13.2
14.6
8.6
9.6
*
Air ∆p is measured during boiler operation using a differential pressure gauge connected to the venti-
lator intake.
** The gas consumptions refer to the calorific value at standard conditions at 15°C - 1013 mbar.
5
Fig. 19
KEY
1
Gas pressure intake
2
Gas valve
3
Mixer intake (–)
4
Ventilator intake (+)
5
Nozzle
6
Fan
7
Air/gas mixer
9
Digital pressure gauge
10
20
30
40
50
Air ∆p mm H
O
∆p aria mm H
2
4.5
TIME-CLOCK INSTRUCTIONS
Air ∆p *
mm H
O
2
49.5
35.0
20.0
7.0
7 6
4
3
9
1
2
Fig. 20
60
O
Fig. 21
2
Gas consumption **
G20
m
3
/h st
2.65
2.06
1.46
0.95
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