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4
USE AND MAINTENANCE
IT
ES
4. 1
GAS VALVE
The boiler, is equipped standard with the
PT
HONEYWELL VK 8115M gas valve (fig. 23).
GB
1
5
4
KEY
1
Regulation intake
2
EV1-EV2 coils
3
Pressure inlet upstream
4
Pressure inlet downstream
5
OFF-SET
4.2
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-
put trimmer (10 fig. 20).
To increase working pressure, turn the trim-
Diagram illustrating heat output in relation to "air ∆p"
4.2. 1
35
30
25
20
15
10
5
TABLE 4/a - G20
Variable heat output
(80-60°C) (50-30°C)
kW
28,3
22,9
16, 1
10,4
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.
96
2
3
Fig. 23
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
G20
0
10
20
30
40
50
Air ∆p mm H
∆p aria mm H
Air ∆p*
(80-60°C) (50-30°C)
kW
mm H
O
mm H
O
2
2
31,0
63,8
66,4
25,0
45,0
45,0
17,6
25,0
25,0
11,4
8,4
9,2
KEY
1
Gas pressure intake
2
Gas valve
3
Mixer intake (–)
4
Ventilator intake (+)
5
Nozzle
6
Fan
7
Air/gas mixer
8
Air pressure switch
9
Digital pressure gauge
35
30
25
20
15
10
5
60
70
0
O
O
2
2
TABLE 4/b - G31
Gas consumption**
Variable heat output
G20
(80-60°C) (50-30°C)
m
3
/h st
kW
3,06
28,3
2,48
21,8
1,75
15,4
1, 1 4
10,4
shown in Tables 4 - 4/a - 4/b; or measure
"air ∆p" with a digital pressure gauge con-
nected up as shown in fig. 24.
Compare values with those shown in Tables
4 - 4/a - 4/b.
G31
10
20
30
40
50
60
Air ∆p mm H
∆p aria mm H
Air ∆p*
(80-60°C) (50-30°C)
kW
mm H
O
mm H
2
31,0
68,4
70,4
23,4
45,0
45,0
16,6
25,0
25,0
11,4
9,2
9,5
Fig. 24
70
O
O
2
2
Gas consumption**
G31
O
kg/h
2
1,52
1, 1 9
0,84
0,55
Fig. 25/a
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