Riello 1311 T2, Modulating Operation, Page: 23 / 60

21
20040170
GB
Installation
5.11 Light oil supply
5.11.1 Double-pipe circuit
The burner is equipped with a self-priming pump which is capable
of feeding itself within the limits listed in Tab. G.
Tank higher than burner A
(Fig. 17)
Distance "P" must not exceed 10 meters in order to avoid straining
the pump's seal; distance "V" must not exceed 4 meters in order to
allow pump self-priming even when the tank is almost empty.
Tank lower than burner B
(Fig. 17)
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 enter
the burner from the same height; in this way it will be less proba-
ble that the suction line fails to prime or stops priming.
5.11.2 The loop circuit
A loop circuit consists of a loop of piping departing from and return-
ing to the tank with an auxiliary pump that circulates the fuel under
pressure. A branch connection from the loop feeds 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 Tab. G.
Tab. G
Key (Fig. 17)
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 = Quick closing manual valve with remote control (Italy only)
8 = On/off solenoid valve (Italy only). See electrical layout.
Connections to be carried out by the installer (SV).
9 = Return line
10 = Check valve (only Italy)
Explosion danger due to fuel leaks in the pres-
ence 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.
WARNING
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
+/- H
[m]
RLS 1000/EV C13 RLS 1000/EV C13
Ø [mm] Ø [mm]
20 22 24 27 22 24 27 36
4.0 26 45 73 138 19 33 65 300
3.0 22 39 63 120 16 28 55 260
2.0 18 33 53 102 13 23 45 220
1.0 15 26 44 84 10 18 38 185
0.5 13 23 39 75 9 16 33 165
0 11 20 34 66 7 13 30 145
-4.0 - - - - - - - -
-3.0 - - - 12 - - - 30
-2.0 - 7 14 30 - - 11 70
-1.0 7 14 24 48 - 9 20 108
-0.5 9 17 29 57 5 11 25 125
0 11 20 34 66 7 13 29 145
Fig. 17
D11312