Wolf COB-2 - Technical Specifications; Boiler and Cylinder Data

Specications
72 | WOLF GmbH 3066501_201910
11 Specications
11.1 COB-2 oil condensing boiler
Oil condensing boiler COB-2-15 COB-2-20 COB-2-29 COB-2-40
Rated output:
at 80/60°C stage 1 / 2 kW 9.2 / 14.7 13.4 / 19.5 18.9 / 28.8 27.4 / 38.5
at 50/30°C stage 1 / 2 kW 9.6 / 15.4 14.1 / 20.4 19.9 / 30.4 28.7 / 40.4
Rated load, stage 1 / 2 kW 9.2 / 14.7 13.5 / 19.6 19.0 / 29.0 27.5 / 38.7
Oil throughput, stage 1 / 2 kg/h 0.78 / 1.24 1.14 / 1.65 1.60 / 2.44 2.32 / 3.26
External diameter, heating ow G 1½" 1½" 1½" 1½"
External diameter, heating return G 1½" 1½" 1½" 1½"
Drain connection 1" 1" 1" 1"
Oil connection, ow/return hoses G ⅜" ⅜" ⅜" ⅜"
Dimensions:
Height mm 1290 1290 1290 1490
Width mm 566 566 566 566
Depth mm 605 605 605 605
Weight kg 92 92 92 122
Air/ue pipe connection mm 80/125 80/125 80/125 110/160
Air/ue gas routing Type
B23, B33, C33(x), C43(x), C53(x), C63(x), C83(x),
C93(x)
Fuel oil to DIN 51603-1/6
Standard fuel oil EL, low sulphur fuel oil EL, biofuel
oil B10
Nozzle * Danfoss 0.30 / 80° S 0.35 / 60° S 0.45 / 80° S 0.55/80° S
Fuel oil lter Siku max. 40 μm
CO
2
setting (casing open) % 12.7 ± 0.3 12.7 ± 0.3 12.7 ± 0.3 12.7 ± 0.3
O
2
setting (casing open) % 3.8 ± 0.4 3.8 ± 0.4 3.8 ± 0.4 3.8 ± 0.4
CO
2
maximum (casing closed) % 13.5 13.5 13.5 13.5
O
2
minimum (casing closed) % 2.7 2.7 2.7 2.7
Pump pressure stage 1 bar 5.0 8.5 9.8 14
Pump pressure stage 2 bar 13.5 17.0 24.0 25.0
Maximum negative pressure in oil line bar -0.3 -0.3 -0.3 -0.3
Flow temperature, factory setting:
Heat generator °C 80 80 80 80
DHW °C 65 65 65 65
Max. ow temperature °C 90 90 90 90
Heating water pressure drop at Δ T=20 K mbar 3.6 6 17 54
Heating water pressure drop at Δ T=10 K mbar 12 21 55 205
Minimum system pressure bar 1 1 1 1
Operating pressure bar 1.5 - 2.5 1.5 - 2.5 1.5 - 2.5 1.5 - 2.5
Max. permissible boiler pressure bar 3 3 3 3
Heating surface, heating water heat
exchanger
m² 2.55 2.55 3.05 3.85
Water capacity of heating water heat
exchanger
L 7.5 7.5 9.0 11.5
Efciency:
at rated load at 80/60°C (net cv / gross cv) % 99.7 / 94.1 99.5 / 93.9 99.6 / 94.0 99.5 / 93.9
at 30 % partial load and TR = 30°C
(net cv / gross cv)
% 104.7 / 98.8 104.1 / 98.2 104.7 / 98.8 104.3 / 98.4
Boiler standby loss qB at 70°C (EnEV) % 0.75 0.75 0.55 0.45
Rated heat input, stage 2:
Flue gas mass ow rate g/s 6.45 9.06 13.33 17.51
Flue gas temperature 50/30 - 80/60°C °C 40 - 63 49 - 69 55 - 76 56 - 83
Available fan draught Pa 65 65 105 150
Lowest heat input (stage 1):