Riello C9337401 - Hydraulic System; Fuel Supply

20026897
22
GB
Installation
4.10 Hydraulic system
4.10.1 Fuel supply
Double-pipe circuit (Fig. 25)
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 Pump/foot valve height difference
L Piping length
Ø Inside pipe diameter
1Burner
2Pump
3 Filter
4 Manual on/off valve
5 Suction line
6 Foot valve
7 Return line
V Max distance 13 ft
+ H
- H
(ft)
L (ft)
Ø (inch)
1/2” 5/8”
+ 13 197 263
+ 10 164 230
+ 6.6 132 197
+ 4.8 115 181
+ 3.3 99 164
+ 1.6 82 148
066132
- 1.6 59 115
- 3.3 49 99
- 4.8 43 82
- 6.6 33 66
- 10 16 33
- 13 - 20
Fig. 25
1
2
3
7
5
6
6
4
75
- H
+ H
V
P
D737
3
15
/
16
”
B
A