baltur BT 250 DSG 4T Manual Del Usuario página 32

FUEL PIPELINE (LIGHT OIL)
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The following description covers the basic requirements to ensure
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efficient operations.
The unit is equipped with a self-suction pump capable of sucking oil
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directly from the cistern also for the first fill-up. To ensure efficient
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operations, it is preferable to make suction and return pipes with
welded fittings and to avoid the use of threaded connections which
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often cause air infiltration's and disturb pump operations and
consequently those of the burner.
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Where a removable fitting is required, use the welded flange method
with a fuel resistant gasket inserted to ensure a perfect sealing.
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For systems requiring pipes with a relatively small diameter, we
recommend the use of copper pipes. For unavoidable connections
we recommend the use of biconic fittings.
The attached tables show diagrams of the different types of systems
depending on the position of the tank with respect to the burner. The
suction pipe should run up-slope towards the burner to avoid the
possible formation of gas bubbles. Where more than one boiler is
installed in one boiler room, it is essential that each burner has its
own suction pipe.
Only return pipes can lead to a single manifold pipe with an adequate
cross section leading to the cistern.
Never connect the return pipe directly to the suction pipe.
It is advisable to properly insulate the suction and return pipes
to prevent cooling which would effect 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
when operating regularly and silently is 35 cm. of Hg ; if this limit is
exceeded, normal pump operations can no longer be guaranteed.
Maximum suction and return pressure = 1 bar.
DANFOSS PUMP MOD. 160 ÷ 600L/H
1 Heating element seat
2 1/4" Pressure gauge connection
3 Delivery (nozzle)
4 Pump plate
5 Return
6 1/4" Vacuum-meter connection
7 Suction
8 Pump pressure regulation
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