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4.11
Light oil supply
Explosion danger due to fuel leaks in the presence
of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure the fuel interception tap is closed before
performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
Double-pipe circuit (Fig. 21)
The burner is equipped with a self-priming pump which is capable
of feeding itself within the limits listed in the table at the side.
The tank higher than the burner A
Distance "P" must not exceed 33 ft in order to avoid subjecting the
pump's seal to excessive strain; distance "V" must not exceed 13 ft
in order to permit pump self-priming even when the tank is almost
completely empty.
The tank lower than the burner B
Pump suction values higher than 13 ft must not be exceeded be-
cause at higher levels gas is released from the fuel, the pump starts
making noise and its working life-span decreases.
It is good practice to ensure that the return and suction lines enter
the burner from the same height; in this way it will be less probable
that the suction line fails to prime or stops priming.
The loop circuit
A loop circuit consists of a loop of piping exiting and returning to the
tank with an auxiliary pump that circulates the fuel under pressure.
A branch connection from the loop goes to feed the burner.
This circuit is extremely useful whenever the burner pump does not
succeed in self-priming because the tank distance and/or height
difference are higher than the values listed in the table below.
+/- H
(ft)
Ø 3/8"
+ 13
234
+ 10
204
+ 6.6
174
+ 3.3
145
+ 1.6
132
0
118
- 1.6
105
- 3.3
92
- 6.6
63
- 10
33
- 13
–
20036932
Installation
L (ft)
Ø 1/2"
Ø 5/8"
454
493
401
493
399
493
296
493
270
493
243
451
217
405
191
359
138
266
86
174
33
82
24
GB
7
5
6
4
6
H
Pump/foot valve height difference
L
Piping length
Ø
Inside pipe diameter
1
Burner
2
Pump
3
Filter
4
Manual on/off valve
5
Suction line
6
Foot valve
7
Return line
V
Max distance 13 ft
A
1
2
5
3
D737
7
B
Fig. 21
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