12
4.6 Electrical connection
☞ Check polarity of the connection plugs.
Wiring diagram see Ch. 5.5.
☞ Connection to the mains supply should be carried out
to the wiring diagram relevant for the type of unit.
Notes for Austria
Electrical isolation with a minimum of 3 mm contact gap,
acting on all poles, must be fitted adjacent to the burner.
Possibilities are:
• Switch (without micro-contacts) with required
separation characteristics
• Circuit breaker
• Contactor
• Screw in type fuse with clearly recognisable
designation
Electrical connection
4.7 Nozzle selection
The ratings division (partial and full load-stages 1&2) of the
burner are carried out via pressure changeover on the
pump.
Recommended Partial load: 10…12…14 bar
pump pressure Full load: 20…22…24 bar
The load is divided according to site conditions. Usually
stage 1 supplies approx. 65% of the maximum oil
throughput.
Nozzle Characteristic Firing rate
make
Fluidics, 45° S, 45°H 35 - 70 kW
Danfoss, Steinen 60° S, 60°H 35 - 70 kW
Conversion of the firing rate in [kW] to the oil
throughput in [kg/h]:
Oil throughput [kg/h] = firing rate [kW] / 11·9
The table is based on information supplied by the nozzle
manufacturers.
*referenced to 7 bar
For nozzle size 1·00 the use of Fluidics or Danfoss
nozzles is recommended.
Oil throughput changes at pressures of 10 to 24 bar
Example of nozzle selection for WL10/2-C, vers. Z
Required firing rate Q
F
= 57 kW
Full load: 57 kW
Partial load (65%): 57 kW x 0·65 = 37 kW
The nozzle selection to table Oil throughput is achieved
with reference to the recommended pump pressures:
Full load: 22 bar / 57·1 kW
➂
Nozzle size 0·85 gph
Partial load: 10 bar / 38·1 kW
➃
➂➃
Values for air damper setting (Ch. 5.3)
➂
Values for diffuser setting (Ch. 5.3)
Nozzle Partial load
size 10 bar 12 bar 14 bar
(USgph)* kW kg/h kW kg/h kW kg/h
0·65 – – – – 34·5 2·9
0·75 – – 36·9 3·1 40·5 3·4
0·85 38·1 3·2 41·7 3·5 45·2 3·8
1·00 45·2 3·8 50·0 4·2 53·6 4·5
1·10 50·0 4·2 54·7 4·6 – –
Full load
18 bar 20 bar 22 bar 24 bar
kW kg/h kW kg/h kW kg/h kW kg/h
0·65 – – 41·7 3·5 44·0 3·7 46·4 3·9
0·75 45·2 3·8 47·6 4·0 50·0 4·2 52·4 4·4
0·85 51·2 4·3 54·7 4·6 57·1 4·8 59·5 5·0
1·00 60·7 5·1 64·3 5·4 66·6 5·6 69·0 5·8
1·10 66·6 5·6 70·2 5·9 – – – –