LIQUID FUEL SUPPLY LINE
The following description covers the basic requirements to ensure
efficient operation.
The unit is equipped with a self-priming pump capable of sucking oil
directly from the tank also for the first fill-up.This statement is valid
only if the necessary conditions exist, see the pipe dimensioning dia-
grams.
To ensure an efficient operation, it is better to make suction and re-
turn pipes with welded fittings and to avoid the use of threaded con-
nections which often cause air infiltration’s interfering with the pump
operation and consequently with the burner.
Where a removable fitting is required, use the welded flange method
with a fuel resistant gasket inserted to ensure a perfect sealing.For
systems requiring pipes with a relatively small diameter, we recom-
mend using copper pipes.
For unavoidable connections we recommend using "biconic" fittings.
The basic diagrams for the different system types depending on the
position of the tank with respect to the burner are shown below.The
intake pipe should run up-slope towards the burner to avoid the pos-
sible build-up of gas bubbles.Where more than one burner is installed
in one boiler room, it is essential that each burner has its own intake
pipe.
Only return pipes can lead to a single manifold pipe with an adequate
cross section leading to the tank. Avoid at all costs connecting directly
the return pipe on the intake pipe.
It is advisable to properly insulate the intake and return pipes to pre-
vent cooling which would affect the unit’s efficiency.Pipe diameters (to
be strictly complied with) are listed in the following tables.
The maximum amount of vacuum that the pump can withstand noise-
lessly under normal operating conditions is 0.47 bar; if these limit is
exceeded normal pump operation will no longer be guaranteed.
Maximum suction and return pressure = 1 bar.
AUXILIARY PUMP
In some cases (excessive distance or differences in level) the system
must be implemented with a "loop" supply circuit with an auxiliary
pump, avoiding to connect the burner pump directly to the tank.
In this case, the auxiliary pump can be started when the burner starts
and stopped when it stops.
The electric wiring of the auxiliary pump is made by connecting the
coil (230V) which controls the pump remote control switch in parallel
to the motor-fan remote switch coil.
Always follow the instructions below:
•
The auxiliary pump must be installed as close as possible to the
liquid to be sucked.
•
The head must be suitable for the relative plant.
•
We recommend a flow rate equal at least to that of the burner pump.
•
The connection pipes must be dimensioned based on the flow rate
of the auxiliary pump.
•
Avoid electrically connecting the auxiliary pump directly to the re-
mote control switch of the burner.
ENGLISH
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