Hydraulic Connections; Hydraulic Circuit Diagram - Riello RLS 70 Manual

5.10.2 Hydraulic connections

 Make sure that the hoses to the pump supply
and return line are installed correctly.
CAUTION
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.
During the installation, hoses must not be
stressed with twisting.
ATTENTION
 Place the pipes so that they are not crushed or are in contact
with hot parts of the boiler and so it is possible to open the
burner.
 Connect, finally, the other end of the flexible hoses to the
suction line and return line ducts by nipples supplied with the
equipment.
Installation

5.10.3 Hydraulic circuit diagram

Key (Fig. 21)
1 Pump suction line
2 Filter
3 Pump
4 Pressure adjuster
5 Return pipe
6 Bypass screw
7 Pump return line
8 Safety valve
9 1st stage valve
10 2nd stage valve
11 Filter
M Pressure gauge
V Vacuometer connection
23 GB
D1184
Fig. 21
D1185
Fig. 22
20168481