
PART III: OPERATION
45
Double-stage burners
1
Once the air and gas flow rates are adjusted, turn the burner off, switch the
CM
switch to the heavy oil operation (OIL, on the bur-
ner control panel.
2
with the electrical panel open, prime the oil pump acting on the related
CP
contactor (see next picture): check the pump motor rota-
tion and keep pressing for some seconds until the oil circuit is charged;
3
start the burner up by means of the thermostat series;
4
bleed the air from the
M
pressure gauge port (Fig. 24) by loosing the cap without removing it, then release the contactor.
Fig. 24
5
drive the burner to high flame stage, by means fo the thermostat
TAB
(high/low flame thermostat - see Wiring diagrams).
6
the nozzle supply pressure is already factory-set and must not be changed. Only if necessary, adjust the supply pressure as fol-
lows (see related paragraph); insert a pressure gauge into the port shown on Fig. 25 and act on on the pump adjusting screw
VR
(see Fig. 38) as to get the nozzle pressure at 20bar (Monarch or Fluidics nozzles - see page 36).
7
the oil flow rate in the high flame stage is the maximum pressure with the return line closed
8
To adjust the
air flow rate in the high flame stage
, loose the
RA
nut and screw
VRA
as to get the desired air flow rate: moving
the rod
TR
towards the air damper shaft, the air damper opens and consequently the air flow rate increases, moving it far from the
shaft the air damper closes and the air flow rate decreases.
Note:
once the procedure is perfomed, be sure that the blocking nut
RA
is fasten. Do not change the position of the air damper
rods.
9
drive the burner to low flame by means of the
TAB
thermostat.
10 To perform the regulation, remove the cap
D
and loosen the screw
V
(see Fig. 40), by means of a screwdriver (see Fig. 40). The
regulating screw
V
acts on the return pressurefrom the nozzle. Set the pressure to the minimum value of 5 bar. Read the values on
the pressure gauge placed on the regulator’s coupling
M
. Once the regulation is accomplished, replace cap
D
.
Suntec E7
HP Technik UHE
Suntec TA.
Note:
After a certain operating period, the pressure can change because of some dirt on the needle’s seal: remove the screw
VT
(see Fig. 38) and clean.
CP
VR
M
VR
M
VR
M
VRA
RA
TR