Hydraulic Connections; Pump - Riello RLS 280/E Installation, Use And Maintenance Instructions

4.13 Hydraulic connections

The pumps are equipped with a by-pass that connects return
line and suction line.
The pumps are installed on the burner with the by-pass closed
by screw 6)(Fig. 21). It is therefore necessary to connect both
hoses to the pump.
The pump will break immediately if it is run with
the return line closed and the by-pass screw in-
serted.
CAUTION
 Remove the plugs from the suction and return connections of
the pump.

4.13.1 Pump

3 6
1
5
20115903
Technical data
Pump model
Min. delivery rate at 300 PSI pressure
Delivery pressure range
Max. suction pressure
Viscosity range
Max. oil temperature
Max. return pressure
Pressure calibration in the factory
Priming pump
Before starting the burner, make sure that the tank
return line is not clogged.
Obstructions in the line could cause the sealing or-
WARNING
gan located on the pump shaft to break.
 In order for the pump (Fig. 21) 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).
20106891
Installation
 Insert the hose connections with the supplied seals into the
WARNING
 Install the hoses where they cannot be stepped on or come
 Now connect the other end of the hoses to the suction and
Key (Fig. 21)
1
2
3
4
5
6
4
-
+
2
Fig. 21
(RLS 280-310/E)
GPH
PSI
PSI
cSt
°F
PSI
PSI
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.
GB
28
connections and screw them down.
Take care that the hoses are not stretched or twist-
ed during installation.
into contact with hot surfaces of the boiler and where they do
not hamper the opening of the burner.
return lines by using the supplied nipples.
Suction line
Return line
Vacuometer connection
Pressure adjuster
By-pass screws
Gauge connection
TA3 TA4
(RLS 410/E)
218 290
102 - 580
7.0
3 - 75
302 (150 °C)
73.0
300
G 3/4" NPT
G 3/4" NPT
G 1/4"
G 1/4"
TA5
(RLS 510/E)
403
102 - 435
Tab. N