SUN G50 - G70
27
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fig. 3c
C
Nota:
for each curve or gate valve, add 0.25
metres to the length of the pipe (pressure
drop).
L
Total length of the inlet pipe, including the
vertical sections
H
Difference in height
Øi
Internal diameter of pipes
P
Auxiliary pump
Connection to the pump
The burner leaves the factory with the internal pump bypass closed, that is, the burner is fitted for two-
pipe connection. Remove the caps and connect the two flexible pipes to the pump inlet (1) and return (2),
as shown in Figure 4, making sure the flexible pipes
are not twisted and that they are positioned so that
they will not be stepped on or come into contact with
the hot parts of the boiler.
If the internal pump bypass needs to be used for
single-pipe connections, remove the bypass screw
(10) and cap the return fitting (2) on the pump,
connecting only the flexible pipe to the inlet fitting (1).
If the pump is operated with the return closed
and the bypass screw inserted, it will be
damaged immediately.
In particular, with single-tube systems, if the
fuel inlet pipe is initially empty, the air
contained in the pipe must be vented for the
fuel pump to be primed. It is recommended,
before igniting the burner, to loosen the
pressure gauge connection (5) screw on the
pump and then perform the ignition cycle.
When the oil comes out of the screw, the
pump is primed. Switch off the burner and
tighten the screw.
Key
1
Suction
2
Return with internal by-pass screw
3
Delivery to the 1st stage nozzle
4
Delivery to the 2nd stage nozzle
5
Pressure gauge connections
6
Vacuum gauge connection
7
Pump pressure adjustment
8
1st stage coil
9
2nd stage coil
10
By-pass screw
11
1/8” reduction with hole Ø1
12
1st stage nozzle
13
2nd stage nozzle
fig 4
7
5
3
6
8
9
4
1
2
5
11
12
13
10
