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4.10 Hydraulic system
Explosion danger due to fuel leaks in the presence
of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure that 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
Legend (Fig. 18)
1
Pump suction
2
Filter
3
Pump
4
Pressure regulator
5
Return pipe
6
By-pass screw
7
Pump return
4.10.1 Fuel supply
The burner is equipped with a self-priming pump which is capable
of feeding itself within the limits listed in the Tab. I.
The tank higher than the burner A
The distance "P" must not exceed 33 ft in order to avoid subjecting
the pump's seal to excessive strain.
The 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 "Hg 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 prac-
tice to ensure that the return and suction lines enter the burner from
the same height. In this way it will be more improbable that the suc-
tion line fails to prime or stops priming.
+ H
- H
ft
5/16"
+ 13
115
+ 10
99
+ 6.6
86
+ 3.3
69
+ 1.6
63
0
56
- 1.5
49
- 3.3
43
- 6.6
30
- 10
13
- 13
-
Legend (Fig. 19)
1
Burner
2
Pump
3
Filter
4
Manual on/off valve
5
Return line
6
Foot valve
20027066
8
Safety solenoid
9
Low fire valve
10 High fire valve
11 Filter
M Pressure gauge
P
Min. oil pressure switch
V
Vacuum gauge
L ft
Ø (inch)
3/8"
1/2"
296
500
263
500
227
500
194
428
174
391
158
355
141
319
122
283
89
211
53
138
20
66
Tab. I
7
Suction line
H Pump/foot valve height dif-
ference
L
Piping length
Ø Inside pipe diameter
22
Installation
P
7
6
6
GB
D2596
5
A
1
4
7
3
5
B
Fig. 18
2
D2543
Fig. 19
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