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3.17 YEARLY APPLIANCE CHECK AND
MAINTENANCE.
e following checks and maintenance should
be performed at least once a year.
- Clean the ue side of the heat exchanger.
- Clean the main burner.
- Visually check the ue hood for deterioration
or corrosion.
- Check correct lighting and operation.
- Ensure correct calibration of the burner in
domestic water and heating phases.
- Check correct operation of control and
adjustment devices and in particular:
- intervention of main electrical switch
positioned outside of the boiler;
- system control thermostat intervention;
- domestic hot water control thermostat
intervention.
- Check sealing e ciency of gas circuit and the
internal system.
- Check the intervention of the device against no
gas ionisation ame control. Intervention time
must be less than 10 seconds.
FAN POWER: 30W
HEAT
HEAT
THERMAL
THERMAL
(kW)
(kcal/h)
24.0
20640
23.0
19780
22.5
19353
21.0
18060
20.0
17200
19.0
16340
CH
+
18.0
15480
D.H.W.
17.0
14620
16.0
13760
15.0
12900
14.0
12040
13.0
11180
12.0
10320
11.0
9460
10.0
8600
9.3
7998
8.0
6880
D.H.W.
7.2
6192
3.19 COMBUSTION PARAMETERS.
FAN POWER: 30W
Gas nozzle diameter
Supply pressure
Flue ow rate at nominal heat output
Flue ow rate at min heat output
CO
at Nom Q./Min.
2
CO with 0% O
at Nom Q /Min.
2
NO
with 0% O
at Nom Q /Min.
X
2
Flue temperature at nominal output
Flue temperature at minimum output
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety drain valve
is not blocked.
- Check that, a er discharging system pressure
and bringing it to zero (read on boiler
manometer), the expansion vessel charge is at
1.0 bar.
- Check that the system static pressure (with
system cold and a er re lling the system by
means of the lling valve) is between 1 and 1.2
bar.
- Check visually that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- water pressure switch,
- air pressure switch
- Check the condition and integrity of the
electrical system and in particular:
- electrical power cables must be inside the
fairleads;
- there must be no traces of blackening or
burning.
METHANE (G20)
GAS FLOW
PRESS. NOZZLE
RATE
BURNER
BURNER
3
(m
/h)
(mbar)
(mm H
O)
2
2.71
11.19
114.1
2.60
10.39
106.0
2.55
10.00
102.0
2.39
8.88
90.6
2.28
8.17
83.3
2.17
7.48
76.3
2.06
6.83
69.6
1.96
6.20
63.2
1.85
5.59
57.0
1.74
5.01
51.1
1.63
4.46
45.5
1.52
3.93
40.1
1.41
3.42
34.9
1.30
2.94
30.0
1.19
2.49
25.4
1.11
2.18
22.3
0.97
1.65
16.8
0.88
1.34
13.7
29
N.B.: when performing periodical maintenance
of the appliance it is appropriate also to check and
perform maintenance on the heating system, in
compliance with that indicated by the regulations
in force.
3.18 VARIABLE HEAT OUTPUT.
Attention: based on the boiler model (checking
which type of fan is installed), use appropriate
data.
N.B.: the pressures indicated in the table
represent the di erence in existing pressures
between the gas valve outlet and the combustion
chamber.
carried out using a differential manometer
(small "U"-shaped column or digital manometer)
with the probes inserted in the pressure test gas
valve outlet and on the sealed chamber positive
pressure test.
obtained with intake-exhaust pipe measuring 0.5
m in length. Gas ow rates refer to heating power
below a temperature of 15°C and at a pressure of
1013 mbar. Burner pressure values refer to use
of gas at 15°C.
BUTANE (G30)
GAS FLOW
PRESS. NOZZLE
RATE
BURNER
BURNER
(kg/h)
(mbar)
(mm H
O)
2
2.03
27.77
283.2
1.94
25.32
258.2
1.90
24.15
246.3
1.78
20.82
212.3
1.70
18.76
191.3
1.62
16.82
171.6
1.54
15.01
153.1
1.46
13.32
135.8
1.38
11.74
119.7
1.30
10.29
104.9
1.22
8.94
91.2
1.14
7.72
78.7
1.06
6.62
67.5
0.97
5.63
57.4
0.89
4.76
48.6
0.83
4.23
43.1
0.72
3.40
34.7
0.65
3.00
30.6
G20
mm
1.35
mbar (mm H
O)
20 (204)
2
kg/h
59
kg/h
61
%
6.20 / 1.80
ppm
74 / 138
mg/kWh
95 / 65
°C
96
°C
86
e adjustments should therefore,be
e power data in the table has been
PROPANE (G31)
GAS FLOW
PRESS. NOZZLE
RATE
BURNER
BURNER
(kg/h)
(mbar)
(mm H
O)
2
1.99
35.95
366.6
1.91
33.35
340.1
1.87
32.10
327.4
1.75
28.47
290.3
1.67
26.18
267.0
1.59
23.98
244.6
1.52
21.88
223.1
1.44
19.86
202.5
1.36
17.93
182.8
1.28
16.09
164.1
1.20
14.33
146.1
1.12
12.66
129.1
1.04
11.07
112.9
0.96
9.57
97.6
0.88
8.15
83.1
0.82
7.20
73.4
0.71
5.56
56.7
0.64
4.63
47.2
G30
G31
0.79
0.79
29 (296)
37 (377)
53
54
59
52
8.00 / 2.20
7.85 / 2.45
135 / 152
93 / 123
127 / 76
115 / 67
106
105
94
96
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