Riello RLS 310/EV O2 MX, Modulating Operation

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27 20182250 GB
Installation
5.12.4 Priming pump

In order for the pump (Fig. 23) to self-prime, it is vital that the
screw 4) of the pump be loosened to vent the air contained
in the suction line.

Start the burner by closing the remote controls.
As soon as the burner starts, check the direction of rotation
of the fan blade.

The pump can be considered to be primed when the light oil
starts coming out of the screw 4). Close the burner and undo
the screws 4).
Key (Fig. 23)
1 Suction line G 1/2”
2 Return line G 1/2”
3 Pressure switch connection G 1/4”
4 Vacuometer connection G 1/4”
5 Pressure adjuster
6 By-pass screws
7 Gauge connection G 1/4”
Tab. N
The time required for this operation depends upon the diameter
and length of the suction tubing.
If the pump fails to prime at first start-up and the burner locks out,
wait approx. 15 seconds, reset the burner, and then repeat the
start-up operation.
And so on. After 5 or 6 starting operations allow 2 or 3 minutes
for the transformer to cool.
Do not light the flame sensor or the burner will lock out; the burner
should lock out anyway about 10 seconds after it starts.
5.12.5 Pressure variator
The pressure variator (Fig. 24), allows the pressure on the return
line of the nozzle to be varied according to the required output.
The pressure on the return line is adjusted by varying a section
by means of the rotation of the servomotor 10)(Fig. 5 on
page 12), which also controls the gas butterfly valve at the same
time.

Regulator at 0° (maximum opening) = minimum pressure on
the nozzle return line.

Regulator at 90° (minimum opening) = maximum pressure
on the nozzle return line.
The servomotor is controlled by the electronic cam 1)(Fig. 6 on
page 13); thanks to this device, it is possible to set different
curves for oil and gas on the same servomotor (also for the air
damper servomotor 4)(Fig. 5 on page 12).

In the oil regulation the regulation is carried out on the
basis of the nozzle that has been mounted and the modula-
tion required.
Key (Fig. 24)
1 Nozzle delivery pressure gauge
2 Nozzle return pressure gauge
3 Position indicator (0 ÷ 90) of the pressure variator
4 Maximum oil pressure switch on return circuit
WARNING
Before starting the burner, make sure that the tank
return line is not clogged.
Obstructions in the line could cause the sealing
organ located on the pump shaft to break.
MODELS RLS 310 RLS 410
RLS 510
RLS 610
TA 3 TA 4 TA 5
Min. delivery rate
at 16.5 bar pressure Kg/h
700 930 1270
Pressure range
in outlet line
bar 7 - 40 7 - 30
Max depression
in suction line
bar 0,45 0,45
Viscosity range cSt 2 - 75 2 - 75
Maximum oil
temperature
°C 150 150
Max pressure in suc-
tion and return lines
bar 5 5
Pressure calibration
in factory
bar 22 - 20 22 - 20
Fig. 23
D9249
Fig. 24
20086802