Sime DUETTO 20 OF, Инструкции по установке

Страница: 74 / 148

group sideways, the ducts must be
passed through the aperture on the
right or left hand side of the shell for
connection to the pump (fig. 7 - 7/a).
Important
–Make sure, before turning on the
boiler, that the return tube is free.
An excessive count er -pr essur e
would break the pump seal.
– M a k e s u r e t h a t t h e t u b e s a r e
sealed.
–The maximum depression of 0.4 bar
(300 mmHg) (see Table 1) must not
be exceeded. Gas is freed from the
fuel above that value and can cause
cavitation of the pump.
–It’s advisable to bring the return
tube in the depression systems up
to the same height of the intake
tube. In this case the foot valve is
unnecessary.
If instead the return tube arrives
above the fuel level, the foot valve is
indispensable.
Starting the pump
Turn on the burner to start the pump
and check the flame ignition.
If a “lock out” occur s bef or e fuel
arrival, wait for at least 20 seconds
then press the burner release button
“RESET” and wait for the whole start-
up operation to repeat until the flame
lights up.
2.5 BURNER ADJUSTMENTS
Each unit is shipped with a burner unit
equipped with a nozzle and calibrated
at the factory; it is recommended,
however, that the settings listed under
point 1.3 be checked, with reference
to atmospheric pressure at sea level.
If it is necessary to adjust the burner
differently from the factory settings,
this should be done by authorised per-
sonnel following the instructions pro-
vided below.
Remove the shell door to access the
burner unit’s controls.
2.5.1 Air lock adjustment
To adjust the air lock, loosen the screw
(1 fig. 8) and slide the graduated scale
(2 fig. 8) indicating the position air lock
position.
The values for adjustment of each unit
are given in point 1.3.
2.5.2 Pump pressure
adjustment
To adjust gas-oil pressure, turn the
screw (3 fig. 8/a) and check pressure
with a pressure gauche connected to
the intake (2 fig. 8/a), making sure
pressure corresponds to the value
given under point 1.3.
72
H max 4 m
H
H
1
2
3
4
5
6
7
8
10 9 9
Fig. 7
Fig. 7/a
H L (meters)
meters øi tube øi tube
8 mm 10 mm
0 35 100
0,5 30 100
1 25 100
1,5 20 90
2 15 70
3 8 30
3,5 6 20
CONNECTIONS
1 Vacuometer attachment
2 Pressure regulator
3 Manometer attachment
4 By-pass screw
5 Back-flow flexible pipe
(included in supply)
6 Suction flexible pipe
(included in supply)
7 Auxiliary pressure intake
8 Valve
9 Racor 3/8” (included in supply)
10 Fuel feed line filter
(included in supply)
ATTENTION:
- loosen the pump joints (5-6) before pointing the flexible pipes for
bringing them out from the prefixed opening on the right/left hand
side of the shell. Afterwards tighten the joints to the pump.
- The pump is prearranged for the double-tube function. Remove the
by-pass screw (4) for single tube function.
H = Difference in level
L = Maximum length
of the intake tube
TABLE 1