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4.3
ADJUSTMENT
OF HEAT OUTPUT
FOR HEATING
To adjust boiler heat output for heating
purposes, i.e., modifying the setting made
at the factory which is approximately 17
kW, use a screwdriver to adjust the hea-
ting heat output trimmer (10 fig. 17).
To increase working pressure, turn the
trimmer 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 Tables 4 - 4/a - 4/b; or
measure "air ∆p" with a digital pressure
gauge connected up as shown in fig. 21.
Compare values with those shown in
Tables 4 - 4/a - 4/b.
Diagram illustrating heat output in relation to "air ∆p"
4.3. 1
35
30
25
20
15
10
5
0
10
TABLE 4/a - G20
Variable heat output
(80-60°C) (50-30°C)
kW
kW
29,3
32,0
22,9
25,0
16, 1
17,6
10,4
11,4
Air ∆p is measured during boiler operation using a differential pressure gauge connected to the ventilator intake.
*
** The gas consumptions refer to the calorific value at standard conditions at 15°C - 1013 mbar.
94
G20
20
30
40
50
60
∆p aria mm H
Air ∆p mm H
O
2
Air ∆p*
Gas consum.**
(80-60°C) (50-30°C)
G20
mm H
O
mm H
O
m
3
2
2
63,8
66,4
45,0
45,0
2,48
25,0
25,0
1,75
8,4
9,2
7 6
5
4
3
9
1
35
30
25
20
15
10
5
70
0
O
2
TABLE 4/b - G31
Variable heat output
(80-60°C) (50-30°C)
/h st
kW
3, 1 7
29,3
21,8
15,4
1, 1 4
10,4
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
2
G31
10
20
30
40
50
∆p aria mm H
∆p de aire mm H
Air ∆p*
(80-60°C) (50-30°C)
kW
mm H
O
mm H
O
2
2
32,0
68,4
70,4
23,4
45,0
45,0
16,6
25,0
25,0
11,4
9,2
9,5
Fig. 21
60
70
O
O
2
2
Gas consum.**
G20
m
3
/h st
1,52
1, 1 9
0,84
0,55
Fig. 22
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