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SUN G20
28
Cod. 35442633 - 01/2007 (Rev. 00)
fig. 3c
C
Nota:
for each curve or gate valve, add 0.25 me-
tres 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 sin-
gle-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 clo-
sed 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 nozzle
4
1st stage pump pressure adjustment
5
Pressure gauge connections
6
Vacuum gauge connection
7
2nd stage pump pressure adjustment
8
2nd stage coil
9
1st stage coil
10
By-pass
screw
12
Nozzle
fig 4
7
5
6
8
9
3
1
2
12
10
4
Содержание SUN G20
Страница 107: ......
