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Edition: 06 / 2015 Page 15 / 146
VARMAX - Installation, Use and Maintenance
3.3.1. G20 Natural Gas
MODELS
120 140 180 225 275 320 390 450
Nominal power Pn
(80/60°C)
kW 117 136 175 219 268 312 381 439
Nominal power when
condensing P (50/30°C)
kW 127 148 191 238 290 338 415 478
Nominal heat input Qn kW 120 140 180 225 275 320 390 450
Minimum heat input
Qmin
kW 28 28 43 43 66 66 87 87
Gas ow rate at Pn m
3
/h 12,7 14,81 19,05 23,81 29,1 33,86 41,3 47,6
CO
2
value ranges %
Qmin : 8,3 % < CO
2
< 8,7 %
Qmax : 8,8 % < CO
2
< 9,2 %
Flue-gas mass ow rate
at Qn / Qmin (80/60°C)
g/s
52,8 /
13
61,3 /
13,1
80,4 /
20,8
99,5 /
21,1
113,9 /
26,9
133,2 /
29,1
169 /
39,2
200,7 /
35,6
Flue-gas mass ow rate
at Qn / Qmin (50/30°C)
g/s
49,1 /
12,3
57,6 /
12,2
75,9 /
19,5
93,0 /
19,5
108,7 /
17,1
126,3 /
27,1
159,6 /
36,7
191 /
33,4
Flue-gas temperature at
Qn / Qmin (80/60°C)
°C
60,8 /
56,9
62,1 /
57,3
61,0 /
56,6
62,3 /
57,7
61,7 /
58,3
63,4 /
57,2
62,5 /
57,4
64,8 /
57,1
Flue-gas temperature at
Qn / Qmin (50/30°C)
°C
35,7 /
28,8
37,7 /
30,2
33,7 /
30,0
36,9 /
30,2
36,3 /
29,8
36,2 /
28,3
36,7 /
30
41,7 /
30,2
Appliance pressure at
nominal Qcal (B23)
Pa 88 108 103 147 132 162 152 203
Inside diameter of ue-
gas output
mm 150 150 150 150 180 180 200 200
Maximum allowable
nozzle pressure (B23P) at
Qn / Qmin (80/60°C)
Pa
200 /
5
200 /
5
115 /
5
165 /
5
122 /
5
176 /
5
180 /
5
193 /
5
Maximum allowable
nozzle pressure (B23P) at
Qn / Qmin (50/30°C)
Pa
166 /
5
164 /
5
92 /
5
128 /
5
97 /
5
145 /
5
155 /
5
173 /
5
Combustion air ow rate
at Qn
m
3
/h 153,8 179,4 230,7 288,3 352,4 410,1 499,8 576,7
NOx class 5
Flue-gas removal and air inlet
type classi cations
B23, B23P
C13, C33, C53
B23, B23P
C53
3.3. Combustion at 15°C and 1013 mbar
15


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