10
PUMP
1 - Suction
G 1/2"
2 - Return
G 1/2"
3 - Pressure gauge attachment
G 1/8"
4 - Vacuum meter attachment
G 1/8"
5 - Pressure adjustment screw
6 - By-pass screw
A - Min. delivery rate at 12 bar pressure
B - Delivery pressure range
C - Max. suction depression
D - Viscosity range
E - Light oil max. temperature
F - Max. suction and return pressure
G - Pressure calibration in the factory
H - Filter mesh width
PUMP PRIMING
-
Before starting the burner, make sure that
the tank return line is not clogged.
Obstructions in the line could cause the
sealing organ located on the pump shaft
to break.
(The pump leaves the factory with
the by-pass closed).
-
For self-priming to take place, the screw
3)(A) of the pump must be loosened in order
to bleed off the air contained in the suction
line.
-
Start the burner by closing the thermostats/
pressure switches, and with the switch 1)(B)
in the "ON" position. The rotation of the
pump motor must be as indicated in Fig.C.
-
The pump can be considered to be primed
when the light oil starts coming out of the
screw 3). Stop the burner: switch 1)(B) set to
"OFF" and tighten the screw 3).
The time required for this operation depends
upon the diameter and length of the suction tub-
ing. If the pump fails to prime at the first starting
of the burner and the burner locks out, wait
approx. 15 seconds, reset the burner, and then
repeat the starting operation as often as
required. After 5 or 6 starting operations allow 2
or 3 minutes for the transformer to cool.
Do not illuminate the UV cell or the burner will
lock out; the burner should lock out anyway
about 10 seconds after it starts.
Important:
the a.m. operation is possible
because the pump is already full of fuel when it
leaves the factory. If the pump has been
drained, fill it with fuel through the opening on
the vacuum meter prior to starting; otherwise,
the pump will seize. Whenever the length of the
suction piping exceeds 20-30 meters, the supply
line must be filled using a separate pump.
BURNER CALIBRATION
FIRING
Set switch 1)(B) to "ON".
During the first firing, during the passage from
the 1st to the 2nd stage, there is a momentary
lowering of the fuel pressure caused by the fill-
ing of the 2nd stage nozzle tubing. This lowering
of the fuel pressure can cause the burner to
lock-out and can sometimes give rise to pulsa-
tions.
Once the following adjustments have been
made, the firing of the burner must generate a
noise similar to the noise generated during oper-
ation.
OPERATION
The optimum calibration of the burner requires
an analysis of the flue gases at the boiler outlet
and interventions on the following points.
• 1st and 2nd stage nozzles
See the information listed on page 7.
• Combustion head
The adjustment of the combustion head already
carried out (page 8) need not be altered unless
the 2nd stage delivery of the burner is changed.
• Pump pressure
12 bar: This is the pressure calibrated in the fac-
tory which is usually sufficient for most pur-
poses. Sometimes, this pressure must be
adjusted to:
10 bar in order to reduce fuel delivery. This
adjustment is possible only if the surrounding
temperature remains above 0 °C;
14 bar in order to increase fuel delivery or to
ensure firings even at temperatures of less than
0 °C.
In order to adjust pump pressure, use the screw
5)(A).
• 1st and 2nd stage fan air gate valve
See adjustments page 11 (Servomotor).
(B)
D469
(A)
PUMP
SUNTEC TA 2
D1251
J7 C
A
B
C
D
E
F
G
H
kg/h
bar
bar
cSt
°C
bar
bar
mm
230
10 - 21
0,45
2,8 - 200
90
1,5
12
0,170
1
2
Burner
1°
2°
Stage
Off
On
(C)
D3959
ROTATION OF PUMP MOTOR
