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DIRECT VENT OIL BURNERS
Riello Burners
All Riello direct vent burners are shipped with the nozzle for the SLD375 installed. A separate nozzle is
included in the burner carton for the SLD4100 and SLD5125. See the burner set up page or the Installer
Serviceman Label attached to the boiler. for the appropriate burner settings.
Boilers supplied with Riello burners will also be supplied with a 3” to 4” galvanized adapter.
The adapter is to be fastened directly to the flange opening on the burner cover using three sheet metal
screws.
The Riello BF5 burners for use with direct vent systems are shipped with the controls, which provide
pre and post purge. Pre purge is provided to ensure clean starts under all conditions. Post purge is
provided to ensure that the boiler fires at maximum efficiency and dependability throughout the heating
season. Post purge timing is variable. The factory set post purge timing should be set at
approximately 45 seconds. Post purge times in excess of 60 seconds when using the Riello burner
will cause the Honeywell Aquastat to lock out on an error code Err4 B1 fault.
Beckett Burners
Boilers supplied with the Beckett NX burner are supplied with an inlet air adapter which must be
installed in place of the inlet air louvers. Refer to the Beckett NX burner manual.
Beckett NX burners for use with direct vent systems are shipped with the controls, which provide pre
and post purge. Pre purge is provided to ensure clean starts under all conditions. Post purge is provided
to ensure that the boiler fires at maximum efficiency and dependability throughout the heating season.
Post purge of the oil burner is controlled through the electronic circuitry supplied on the oil burner
primary control. The factory set post purge timing is set at approximately one minute.
Burner Installation
The burner is mounted to the door with (4) 8mm studs, nuts and washers (located in the burner trim bag).
Thread the (4) studs in to the (4) M8 holes threaded to permit connection to the burner. Thread the shorter
length of stud into cast door.
Check that the correct nozzle is properly installed in the burner as shown in the preliminary burner settings
and that the burner electrode are adjusted as per the oil burner manual.
When using the Beckett AFG oil burner on the three or four section boiler, the opening in the
refractory on the door must be enlarged to insert the oil burner without damaging the door
refractory. Use a sharp utility knife to carefully trim the opening to size.
The oil burner when properly installed will extend beyond the refractory liner of the burner door.
Riello - will extend approximately 2” beyond the refractory on the swing door.
HeatWise - will extend approximately 3” beyond the refractory on the swing door.
Beckett AFG - will extend approximately 4-1/8” beyond the refractory on the swing door.
Beckett NX - will extend approximately 2-3/4” beyond the refractory on the swing door.
Check that there is a complete seal between the door and the burner flange after installing ceramic fiber seal
furnished with the burner.
Place burner Installer/Serviceman label on boiler jacket front panel as required.