Pressure Regulator; Wiring Diagrams - Riello DB 6 LM C10 TC FS1 A0 T150 Installation, Use And Maintenance Instruction

4.2

Pressure regulator

2
3
To calibrate cam (1): remove the gear-case, loosen screws (2), act on screw (3) until required eccentricity is obtained.
Turning the screw (3) to the left (+sign) eccentricity is increased, thus increasing the difference between nozzle maximum and min-
imum delivery.
Turning screw (3) to the right (- sign) eccentricity is reduced; thereby reducing the difference between nozzle maximum and min-
imum delivery.
Every variation of the eccentricity may require a travel offset using nut and locknut (4).
NB.
- To obtain a correct calibration, cam (1) must operate over the travel range of the servo-motor as wider as possible; every vari-
ation of the servo-motor must be matched by a variation in pressure.
- Never give the variator piston a snug fit: stop ring determines the maximum travel.
- When the adjustment has been made, manually check that there is knocking between maximum and minimum and that max.
and min. pressures match pre-selected values as indicated on the delivery nozzle diagram.
If, at maximum nozzle delivery (maximum return pressure), pressure oscillations are detected on pressure gauge (6), slightly
reduce pressure until the oscillations are eliminated.
4.3

Wiring diagrams

Burner terminal strip
MB
Air pressure switch
PA
Maximum oil pressure switch
PO
10
1
4
5
D8416
Fig. 12
Servomotor
SM
Ignition transformer
TA
Burner earth
TB
4
Burner description
CHAPTER
UV
VF
VR
VS
6
Fig. 11
D8403
UV cell
Operation valve
Oil return valve
Oil safety valve