baltur TBML 50 ME Installation, Use And Maintenance Instruction Manual page 62

ENGLISH
DIESEL 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 dimensio-
ning diagrams.
To ensure an efficient operation, it is better to make suction and
return pipes with welded fittings and to avoid the use of threaded
connections 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 diame-
ter, we recommend using copper pipes.
For unavoidable connections we recommend using "biconic" fit-
tings.
These are the diagrams of the different types of systems depen-
ding on the position of the tank with respect to the burner.The
suction pipe should run up-slope towards the burner to avoid pos-
sible formation 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 ade-
quate cross section leading to the tank. Never connect the return
pipe directly to the intake pipe.
It is advisable to properly insulate the intake and return pipes to
prevent cooling which would affect the unit's efficiency.Pipe dia-
meters (to be strictly complied with are listed in the following table.
The maximum amount of vacuum that the pump can withstand
noiselessly under normal operating conditions is 0.47 bar; if these
limit is exceeded normal pump operation will no longer be gua-
ranteed.
Maximum pressure at intake and return = 1 bar.
AUXILIARY PUMP
In some cases (excessive distance or differences in level) the sy-
stem 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 connection of the auxiliary pump is made by con-
necting the coil (230V) that controls the pump's remote control
switch to terminals 2 (N) and 17 on the printed circuit.
It is important to comply strictly with the previsions set forth here
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 that is at least equal to the flow rate
of the burner pump.
• Connection pipes should be sized to cope with the delivery rate
of the auxiliary pump.
• Absolutely avoid electrically connecting the auxiliary pump di-
rectly to the contactor of the burner.
• Set the pressure to about 0.5 bar ÷ 1 bar if the circuit is fitted
with pressure regulator.
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