5.12.1 Hydraulic Connections; 5.12.2 Hydraulic Circuit Diagram - Riello RL 190/M Installation, Use And Maintenance Instructions

5.12.1 Hydraulic connections

 Make sure that the hoses to the pump supply
and return line are installed correctly.
CAUTION
Double-pipe circuit
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. 21).
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.
Install the hoses where they cannot be stepped on or come into
contact with hot surfaces of the boiler.
Finally, connect, the other end of the hoses to the suction line and
return line ducts using the nipples supplied with the equipment.
During the installation, hoses must not be
stressed with twisting.
ATTENTION
20166451
Installation

5.12.2 Hydraulic circuit diagram

D1986
1 Pump suction line
D1978
2 Solenoid valve
3 Pump
4 Pressure adjuster
5 Return pipe
6 Bypass screw
7 Pump return line
8 Solenoid valve
9 Solenoid valve
10 Delivery line
11 Nozzle
12 Return line
Fig. 20
13 Pressure adjuster
14 Pressure adjustment eccentric
15 Maximum oil pressure switch
16 Solenoid valve
M Pressure gauge
V Vacuometer connection
22 GB
Fig. 21