Hydraulic Circuit Diagram; Hydraulic Connections; Priming Pump; Suntec J7 C Pump - Riello RLS 190/M MZ Installation, Use And Maintenance Instructions

5.8.3

Hydraulic circuit diagram

D3006
Key (Fig. 19)
1 Pump suction line
2 Filter
3 Pump
4 Pressure adjuster
5 Return pipe
6 By-pass screw
7 Pump return line
5.8.4

Hydraulic connections

The pumps are equipped with a by-pass that connects return line
with suction line. They are installed on the burner with the by-
pass closed by screw 6)(Fig. 20). It is therefore necessary to
connect both hoses to the pump.
The pump will break down immediately if it is run with the return
line closed and the by-pass screw inserted.
Remove plugs from suction and return connectors of the pump.
Insert the hose connections with the supplied seals into the
connections and screw them down. During the installation, hoses
must not be stressed with twisting.
Position hoses so that they cannot be stepped on or get into
contact with hot parts of the boiler and so that they allow burner
opening.
Connect, finally, the other end of the flexible hoses to the suction
and return lines using nipples supplied with the equipment.
D3176
20164195
Installation
Fig. 19
8 Safety valve
9 1st stage valve
10 2nd stage valve
11 Filter
M Pressure gauge
V Vacuometer
Fig. 20
20
5.8.5

Priming pump

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.
ATTENTION
 Make sure that the valves on the suction line are open and
that there is fuel in the tank.
 In order for self-priming to take place, the screw (3) of the
pump must be loosened, see Fig. 24, to bleed off the air
contained in the suction pipe.
 Start the burner by closing the remote controls, with the
switch 1)(Fig. 33) in "MAN" position and switch 6)(Fig. 5) in
"OIL" position.
 The pump can be considered primed when the light oil starts
coming out of the screw 3)(Fig. 21). Stop the burner: set
switch 1)(A) to "OFF" and tighten the screw 3).
The time required for this operation depends upon the diameter
and length of the suction tubing. If the pump fails to prime at the
first starting of the burner and the burner locks out, wait approx.
15 seconds, reset the burner, and then repeat the starting
operation as often as required. And so on. After 5 or 6 starting
operations allow 2 or 3 minutes for the transformer to cool. Do not
light the UV cell in order to prevent the burner lockout; the burner
locks out in any case about ten second after its start.
The a.m. operation is possible because the pump
is already full of fuel when it leaves the factory. If
the pump has been drained, fill it with fuel through
the opening on the vacuum meter prior to starting;
ATTENTION
otherwise, the pump will seize. Whenever the
length of the suction piping exceeds 20-30
meters, the supply line must be filled using a
separate pump.
5.8.6 pump
Suntec J7 C
Key (Fig. 20)
1 Suction line
2 Return line
3 Pressure gauge connection G 1/8"
4 Vacuometer connection
5 Pressure adjuster
6 By-pass screw
Min. delivery rate at 12 bar pressure
Delivery pressure range
Max. suction depression
Viscosity range
Max. light oil temperature
Max. suction and return pressure
Pressure calibration in the factory
Filter mesh width
GB
D1251
Fig. 21
G 1/2"
G 1/2"
G 1/8"
230 kg/h
10 - 21 bar
0.45 bar
2.8 - 200 cSt
90 °C
1.5 bar
12 bar
0,170 mm
Tab. I