Two Line (Lift System); Pump Purge; Two Line (Gravity Or Lift System) - Riello F20 Installation, Use And Maintenance Instructions

TWO LINE (LIFT SYSTEM)

A) The burner is shipped with the pump set to oper-
ate on a two line system. Suction and return lines
(6 & 7 in drawing on page 7) should be the same
diameter and both should extend to the same
depth inside the fuel tank.
Be sure there are no air leaks or blockages in the
piping system. Any obstructions in the return line
will cause failure of the pump shaft seal. Do not ex-
ceed the pipe lengths indicated in the table.
B) Attach the two PIPE CONNECTORS (2) to the
pump SUCTION and pump RETURN PORTS (6
and 7).
Attach the required piping to these two pipe con-
nectors using the NPT/METRIC ADAPTERS that
are supplied with the burner.
WARNING:
- Pipe dope or Teflon tapes are NOT to be used on
any direct oil connection to the fuel pump.
- The height 'P' in Pipe Length Charts should not
exceed 13 feet (4 m).
- The vacuum should not exceed 11.44 inches of
mercury.
IMPORTANT:
An external, appropriately listed and certified oil
filter must be placed in the fuel line between the
fuel tank and the burner pump.

PUMP PURGE

TWO LINE (GRAVITY OR LIFT SYSTEM)

Turn off the main power source to the burner and re-
move the air tube cover. Shine a light source on the
flame sensor on the control box (now visible where the
air tube cover was removed), return power to the burn-
er and activate the burner.
With the light source in place, the burner will operate in
prepurge only.
When the pump is sufficiently purged, the hydraulic air
shutter will open.
Once the burner is purged, turn off the power source
and replace the air tube cover. Return power to the
burner. The burner is now ready to operate.
NOTE: To protect the pump gears, it is advisable to lubri-
cate the pump prior to purging a lift system.
Apply oil through the VACUUM PORT (A).
ATTENTION:
It is important that the fuel line be completely sealed and free from air leaks or any internal blockages.
WARNING!
WHEN THE BYPASS PLUG IS INSTALLED, A TWO PIPE SYSTEM MUST BE USED OR FAILURE OF THE
PUMP SHAFT SEAL WILL OCCUR.
2902453
2 LINE (LIFT) SYSTEM - PIPE LENGTHS
H
Feet Meters
0 0.0
1 1/2 0.5
3 1.0
5 1.5
6 1/2 2.0
9 1/2 3.0
11 3.5
ATTENTION:
do not exceed
pipe lengths
indicated in chart!
8
3/8" OD 1/2" OD
Feet Meters Feet
115 35 330
100 30 330
80 25 330
65 20 295
50 15 230
25 8 100
20 6 65
GB
Meters
100
100
100
90
70
30
20
D6008
A
D6181