Swirl disc
Clean the whirl disc using a brush and then blow compressed air on it. To get good combustion the air flow
openings in the whirl disc should be perfectly clean and free.
Nozzle
Carefully unscrew nozzle from nozzle fitting. Blow compressed air through nozzle orifice to free it from dirt. Replace
nozzle if necessary.
Ignition Electrodes
Clean, adjust and if necessary replace ignition electrode. For electrode gap see Fig. 4-5 (dimensions in mm).
Fig. 5 Electrods DH1-70
Fig. 4 Electrods DH2-I-55 & 85; DH1-100
Fuel pump pressure adjustment (Fig. 6)
The fuel pressure is factory set and must be checked and adjusted by qualified technicians only.
Tampering with the unit may be dangerous.
Remove pressure gauge cap (P). Connect a pressure gauge on the pressure measuring port on pump. Start heater and
read fuel pressure value. If necessary adjust pressure to the correct value turning the adjusting screw (P1) clockwise to
increase, anticlockwise to decrease the pressure:
Fig.6
Air collar adjustment (Fig. 7)
The air collar position is factory set and must be checked and adjusted by qualified technicians only.
Tampering with the unit may be dangerous.
Model
Pump Pressure (bar)
DH2-I-55
DH2-I-85
12.0
12.0
DH1-70
DH1-100
11.0
12.5
