17
6074
GB
Hydraulic system
6.2
Hydraulic connections
The pumps are equipped with a by-pass that connects return line
with suction line. The pumps are installed on the burner with the
by-pass closed by screw 6) (Fig. 23 pag. 19).
It is therefore necessary to connect both hoses to the pump.
The pump will break down immediately if it is run with the return
line closed and the by-pass screw inserted.
Remove the plugs from the suction and return connections of the
pump.
Insert the hose connections with the supplied seals into the con-
nections and screw them down.
Take care that the hoses are not stretched or twisted during in-
stallation.
Install the hoses where they cannot be stepped on or come into
contact with hot surfaces of the boiler.
Now connect the other end of the hoses to the suction and return
lines by using the supplied nipples.
6.3
Pump
1
- Suction
G 1/2"
2
- Return
G 1/2"
3
- Pressure gauge connection
G 1/8"
4
- Vacuum meter connection
G 1/8"
5
- Pressure adjustment screw
6
- Screw for by-pass
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
6.3.1
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).
– In order for self-priming to take place, one of the screw 3)
(Fig. 19) of the pump must be loosened in order to bleed off
the air contained in the suction line.
– Start the burner by closing the control devices and with switch
1) (Fig. 20 pag. 18) in the "ON" position. The pump must rotate
in the direction of the arrow marked on the cover.
– The pump can be considered to be primed when the light oil
starts coming out of the screw 3). Stop the burner: switch 1)
(Fig. 20 pag. 18) set to "OFF" and tighten the screw 3).
The time required for this operation depends upon the diameter
and length of the suction tubing. 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 oper-
ation as often as required. After 5 or 6 starting operations allow 2
or 3 minutes for the transformer to cool.
Do not illuminate the photocell or the burner will lock out; the
burner should lock out anyway about 10 seconds after it starts.
Whenever the length of the suction piping exceeds 20-30 meters,
the supply line must be filled using a separate pump.
D1244
Fig. 18
Fig. 19
PUMP
SUNTEC J7 C
D1251
WARNING
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.
