Recommendations For Both Systems (A) And (B); One-Pipe Systems - Riello RL 25/1 BLU Instrucciones De Instalación, Funcionamiento Y Mantenimiento

5.8.2 Recommendations for both systems (A) and
(B)
 Use copper pipes where possible.
 Make sure that the system curves have a wide radius.
 Use bi-conic connectors at both ends of the pipe.
 Whenever the burner is installed in areas with extremely
cold winter climates (temperatures lower than - 10°C), we
recommend insulating both the tank and the piping. Avoid
the smallest of the three pipe diameters provided in the
Table and lay the piping along the most protected route pos-
sible. The paraffin in the fuel begins to solidify below 0°C,
and the filters and nozzle begin to clog accordingly.
 Put a filter on the suction piping, if possible with a clear
transparent tray that allows the regular flow of fuel and
check the condition of the filter.
 The return pipeline does not require a shut-off valve, but if
you want to put it, choose one with lever control so that is
clear when the valve is open or closed (if the burner starts
with the return pipe closed, the sealing organ on the pump
shaft will be damaged).
 The copper pipes should be fitted at a distance from the
burner that allows it to be drawn back on the slide guides
without straining or twisting the hoses.
 When there are several burners in the same room, each
burner has to have its own suction pipe; they can share the
same return line pipe as long as the dimensions allow it.
 The suction line must be completely airtight. To check the
seal, close the pump's return line. Fit a T coupling on the
attachment of the vacuometer. On one branch of the T cou-
pling install a pressure gauge and in the other inject air at a
pressure of 1 bar. After injecting the air the pressure gauge
should remain at a constant pressure.
5.8.3

One-pipe systems

There are two possible solutions:
 Pump external by-pass (A) (recommended)
– connect the two flexible hoses to an automatic degassing
unit, (see paragraph Appendix - Accessories).
– in this case the screw 7) should not be removed (see the
diagram Fig. 19): pump internal by-pass closed.
 Pump internal by-pass (B)
– Connect only the suction line flexible hose to the pump.
– Remove the screw 7), (Fig. 19), accessible from the return
fitting: pump internal by-pass open.
– Tap the fitting of the pump's return line.
– This solution is possible only with low pump depression
values (max. 0.2 bar) and fully airtight piping.
20156111
Installation
A
18 GB
D828
B
Fig. 18