Pump Purge; Single Line (Gravity System) - Riello Burners RIELLO 40 Series Installation & Operating Manual

line system, supply and return lines 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 exceed the pipe lengths indicated in the
tables on page 10.
To install the by-pass plug:
1) Remove the return plug (7)
2) Install the by-pass plug (4) using the 2.5 mm hexagonal key
B) Attach the two PIPE CONNECTORS (6) to the pump SUPPLY and pump RETURN PORTS (5 and 7).
Attach the required piping to these two pipe connectors 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.
WARNING: The height 'P' in Pipe Length Charts should not exceed 13 feet (4 m).
WARNING: 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.
NOTE: To protect the pump gears, it is advisable to lubricate the pump prior to purging a lift system. Apply oil
through the VACUUM PORT (C).
A) SINGLE LINE (GRAVITY FEED SYSTEM)
I. Loosen the bleeder valve (A) until oil flows out. Tighten the bleeder
valve securely and start burner.
II. When bleeding the pump by pressure:
1) Loosen the bleeder valve (A).
2) Disconnect nozzle oil supply line at the pump nozzle port (B).
3) Attach a flexible plastic tube to the pump nozzle, port directing
the oil flow into a bucket.
4) Loosen the screw(s) securing the air tube cover, allowing it to be
removed freely.
5) Holding the air tube cover in its proper location start the burner.
6) When the solenoid valve is engaged approximately 10 seconds
after starting, remove the air tube cover and shine a light source on the photocell, allowing it to see false
light.
7) Run the burner until the fuel pump has been purged of air, then tighten the bleeder valve and
immediately shut down the burner.
8) Reinstall the air tube cover and nozzle line
9) The burner can now be started normally.
WARNING: Omitting steps 2 and 3 will result in a collection of unburned oil in the combustion chamber
C6501000 F3-F5 I-O manual Rev4_3

PUMP PURGE

creating a hazardous situation upon burner startup.
B
V
RIELLO
P
C
A
13