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5.13
Hydraulic connections
The pumps are equipped with a by-pass that connects return line
and suction line. The pumps are installed on the burner with the
by-pass closed by screw 6)(Fig. 19).
It is therefore necessary to connect both hoses to the pump.
The pump will break 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
connections and screw them down.
Take care that the hoses are not stretched or twisted during
installation.
Install the hoses where they cannot be stepped on or come
into contact with hot surfaces of the boiler and where they do
5.14
Pump
In case of use with gas oil containing up to 10%
Bio blend, it will be essential to use flexible oil
lines suitable for bio fuel use.
Please contact Riello for further information.
WARNING
1
Suction
2
Return
3
Pressure gauge attachment
4
Vacuum meter attachment
5
Pressure governor
6
By-pass screw
5.14.1 Technical data
Suntec AJV6CC
Min. delivery rate at 12 bar pressure
Delivery pressure range
Max. suction depression
Viscosity range
Max. gas oil temperature
Max. suction and return pressure
Pressure calibration in the factory
Filter mesh width
5.14.2 Pump priming
Before starting the burner, make sure that the
tank return line is not clogged.
Obstructions in the line could cause the seal-
WARNING
ing organ located on the pump shaft to break.
(The pump leaves the factory with the by-pass
closed).
Installation
D1177
Fig. 21
G 1/4"
G 1/4"
G 1/8"
G 1/8"
kg/h
220
bar
10 - 20
bar
0.45
2
1 - 75
mm
/s (cSt)
°C
60
bar
2
bar
12
mm
0.15
Tab. M
21
not hamper the opening of the burner.
Now connect the other end of the hoses to the suction and
return lines by using the supplied nipples.
D3134
–
Also check to make sure that the valves located on the suc-
tion line are open and that there is sufficient fuel in the tank.
–
For self-priming to take place, one of the screws 3)(Fig. 21)
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, with switch
1)(Fig. 22) in the "MAN" position and with switch 6)(Fig. 6 at
page 13) in the "OIL" position.
–
The pump can be considered to be primed when the gas oil
starts coming out of the screw 3)(Fig. 21). Stop the burner:
switch 1)(Fig. 22) set to "OFF" and tighten the screw 3).
D791
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 operation as often as required.
After 5 or 6 starting operations allow 2 or 3 minutes for the trans-
former 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.
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
WARNING
through the opening on the vacuum meter prior to
starting; otherwise, the pump will seize.
Whenever the length of the suction piping ex-
ceeds 20-30 meters, the supply line must be filled
using a separate pump.
GB
1
2
Fig. 20
Fig. 22
20034985
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