Riello RLS Series, Installation, Use And Maintenance Instructions

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20020804 16
Installation
4.9 Fuel supply
4.9.1 Double-pipe circuit
The burner is equipped with a self-priming pump which is capa-
ble of feeding itself within the limits listed in the table at the side.
The tank higher than the burner A
The distance "P" must not exceed 33 ft in order to avoid subject-
ing the pump's seal to excessive strain; the distance "V" must
not exceed 4 meters in order to permit pump self-priming even
when the tank is almost completely empty.
The tank lower than the burner B
Pump depression values higher than 0.45 bar (35 cm Hg) must
not be exceeded because 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 en-
ter the burner from the same height; in this way it will be more
improbable that the suction line fails to prime or stops priming.
4.9.2 The loop circuit
A loop circuit consists of a loop of piping departing from and re-
turning 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 dis-
tance and/or height difference are higher than the values listed
in the Table.
Tab. 7
Key
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 = Rapid closing manual valve remote controlled (only Italy)
8 = On/off solenoid valve (only Italy). See layout of electric panel
board. Electrical connections set by installer (SV)
9 = Return line
10 = Check valve (only Italy)
1
2
4
8
5
9
10
7
6
6
7
A
B
3
5
9
10
c
m
V
H+
H-
P
D3513
Fig. 17
+ 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
0 66 132
- 1.6 59 115
- 3.3 49 99
- 4.8 43 82
- 6.6 33 66
- 10 16 33
- 13 - 20