7
PRK 1520 PRK 1870 PRK 2350 PRK 3000 PRK 3500
kW
kcal/h x 1000
1.180 ÷ 1.520
1.014,8 ÷ 1.307,2
1.480 ÷ 1.870
1.278,8 ÷ 1.608,2
1.830 ÷ 2.350
1.573,8 ÷ 2.021
2.450 ÷ 3.000
2.107 ÷ 2.580
2.780 ÷ 3.500
2.390,8 ÷ 3.010
kW
kcal/h x 1000
1.270 ÷ 1.664
1.092,9 ÷ 1.431
1590 ÷ 2045
1.367,4 ÷ 1.758,7
1.980 ÷ 2.572
1.702,8 ÷ 2.211,9
2.642 ÷ 3.285
2.272,1 ÷ 2.825,1
3.015 ÷ 3.835
2.592,9 ÷ 3.298,1
Combustion chamber volume m³ 1,55 1,94 2,577 3,033 3,636
kW/m³
kcal/h m³
1.073,5
923.210
1.050
903.086
998
858.280
1.083
931.454
1.054,7
907.068
Exchange surface m² 33,1 41,2 49,5 57,8 71,1
kW/m²
kcal/h m²
45,9
39.492
45,4
39.034
47,5
40.828
51,9
44.637
49,2
42.335
Smoke duct number n° 61 69 79 99 128
Smoke duct diameter Ø est. 1½” 1½” 1½” 1½” 1½”
Boiler weight kg 2.610 3.220 4.010 6.030 7.240
Water content lt. 1.650 2.080 2.690 3.740 4.490
Operating pressure bar 6 6 6 6 6
Hydraulic pressure bar 9 9 9 9 9
Max. operatine temperature °C 95 95 95 95 95
Water loss of heat ∆t=15°C mbar
43 46 40 58 40
Combustion chamber pressure mbar 5,8 6 6 6,5 6,8
Minimum efficiency at 100% % 89,2 89,2 89,2 89,2 89,2
Efficiency at 100% % 91,35 91,4 91,5 91,4 91,3
Minimum effciency at 30% % 87,8 87,8 87,8 87,8 87,8
Efficiency at 30% % 92,8 92,9 92,9 92,5 93,2
Loss of heat at the chimney with working burner % 8,22 8,2 8,12 8,21 8,29
Loss of heat at the chimney with burner out % 0,17 0,20 0,18 0,2 0,16
Loss of heat at the jacket ∆t=50°C %
0,43 0,4 0,38 0,39 0,41
Burner connection (Ø) mm 320 370 370 370 370
Flue connection (Ø) mm 450 500 550 600 700
Min. chimney depression mbar 0,2 0,2 0,2 0,2 0,2
Max smoke temperature °C 197 188 193 188 195
Smoke temperature in the output range °C 147 ÷ 197 149 ÷ 188 159 ÷ 193 152 ÷ 188 155 ÷ 195
CO
2
a gas % 10,2 9,8 10,4 10,2 9,9
CO a gas ppm 69 55 70 77 68
NOx a gas ppm 71 52 72 74 73
Max. light oil smoke flow rate m³/h 3.928 4.828 6.276 8.016 9.358
Max. methane smoke flow rate m³/h 3.490 4.289 5.691 7.269 8.486
Light oil burning air volume (practice) m³/h 2.146 2.638 3.311 4.229 4.937
Methane burning air volume (practice) m³/h 1.989 2.445 2.949 3.766 4.397
Combustion chamber dimensions (DiameterxLenght) mm
880 × 2.550 944 × 2.760 1.020 × 2.780 1.211 × 2.720 1.211 × 3.000
Thermostat adjustment range °C 55 ÷ 80 55 ÷ 80 55 ÷ 80 55 ÷ 80 55 ÷ 80
Output
Fornace output
Thermal load
Thermal output
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