Pump; Pressure Adjustment; Pressurised One-Pipe Systems - Riello RG1RKD Installation, Use And Maintenance Instructions

5.12.2 Pump

The pump is designed to allow working with two pipes.
Before starting up the burner, make sure that the return pipeline
is not clogged.
An excessive back pressure ( 1 bar) would cause the damage
of the pump seal, with subsequent fuel leaks inside the burner.
The suction plug 1) is made of plastic. Once re-
moved, it must not be used again.
In single-pipe installations, the plug in the return
WARNING
line 2) must be totally in steel.
The pump has a delivery pressure regulation device 5). Pressure
increases if turned in a clockwise direction, and decreases if
turned in the other direction. An indication of sensitivity is 1 bar
per turn. The pressure can be regulated in a range of 8 - 15 bar.
Do not loosen the knob 9) and regularly check it is
tight for safety reasons.
WARNING
Check periodically the flexible pipes conditions.
If necessary, install a filter on the fuel supply line.
WARNING
1 Suction line
2 Return line
3 By-pass screw
4 Gauge connection
5 2nd stage pressure adjuster
6 Vacuum gauge connection
7 1st stage pressure adjuster
8 Pressure variator piston
9 2nd stage valve
10 1st stage valve
11 Auxiliary pressure test point
Installation
S7067
Fig. 16

5.12.3 Pressure adjustment

 The pump leaves the factory set at 14 bar.
 If necessary recalibrate the pressure, or if you prefer change
it, just turn the screw 5)(Fig. 16). The pressure gauge for
checking pressure should be fitted in place of the plug
4)(Fig. 16).
When burner shuts down the air damper automatically close
still a max. chimney depressure of 0.5 mbar.

5.12.4 Pressurised one-pipe systems

Pressurised one-pipe systems (Fig. 17) have a positive fuel pres-
sure on intake to the burner.
Usually the tank is higher than the burner, or the fuel pumping
systems are on the outside of the boiler.
For the one pipe operation it is necessary to unscrew the return
plug 2), remove the by-pass screw 3) and then the plug 2) back
in.
H
metres
0.5
1
1.5
2
H = Difference of level
L = Maximum suction line length
Ø = Inner diameter of the pipe
The installer must ensure that the supply pressure
is not above 0.5 bar.
Above that level, the pump seal is subject to too
WARNING
much stress.
In the system in Fig. 17, the table shows the maximum approxi-
mate lengths for the supply line, depending on the difference in
level, length, and the diameter of the fuel conduit.
19 GB
D5702
L metres
Ø (8 mm) Ø (10 mm)
10 20
20 40
40 80
60 100
Fig. 17
Tab. E
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