IT
ES
PT
GB
113
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
.
Fig. 21
9
1
2
3
4
7 6
5
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
0
30
20
10
∆
p aria mm H
2
O
P
o
tenza t
er
mica kW
25
20
10
15
50
40
60
5
30
50-30
°
C
35
70
80-60
°
C
0
30
20
10
∆
p aria mm H
2
O
P
o
tenza t
er
mica kW
25
20
10
15
50
40
60
5
30
50-30
°
C
35
70
80-60
°
C
G20
G31
4.3.1
Diagram illustrating heat output in relation to “air
∆
p”
TABLE 4/a - G20
*
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.
Variable heat output
Air
∆
p*
Gas consum.**
(80-60°C) (50-30°C)
(80-60°C) (50-30°C)
G20
kW
kW
mm H
2
O
mm H
2
O
m
3
/h st
29,3
32,0
63,8
66,4
3,17
22,9
25,0
45,0
45,0
2,48
16,1
17,6
25,0
25,0
1,75
10,4
11,4
8,4
9,2
1,14
TABLE 4/b - G31
Variable heat output
Air
∆
p*
Gas consum.**
(80-60°C) (50-30°C)
(80-60°C) (50-30°C)
G31
kW
kW
mm H
2
O
mm H
2
O
kg/h
29,3
32,0
68,4
70,4
1,52
21,8
23,4
45,0
45,0
1,19
15,4
16,6
25,0
25,0
0,84
10,4
11,4
9,2
9,5
0,55
Fig. 22
Heat
out
out
(kW)
Air
∆
p mm H
2
O
Heat
out
out
(kW)
∆
p de aire mm H
2
O
Summary of Contents for DEWY 30/130
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