baltur TBML 80 PN, Руководство по эксплуатации, Страница: 48 / 76

N°
0
002
90
162
0
10 / 36
0006081428_201406
ENGLISH
DIESEL OIL SUPPLY LINE
The following description covers merely the basic requirements for
efficient operation.
The unit is equipped with a self-suction pump, capable of drawing
oil directly from the tank also for the first fill-up. This statement
holds only if the required conditions exist (refer to table of distances
and difference in levels). To ensure efficient operation, it is better
to install suction and return pipes with welded fittings and to
avoid the use of threaded connections which often cause air
infiltration interfering with the pump operation and consequently
with the burner. Where a removable fitting is required, use the
welded flange method inserting a fuel resistant gasket to obtain
a positive sealing. For systems requiring pipes with a relatively
small diameter we recommend the use of copper piping.
For unavoidable joints we recommend the use of biconic fittings.
The annexed tables show the indicative diagrams for the different
types of systems depending on the position of the tank in respect
to the burner. The suction pipe should run upward to the burner to
prevent possible formation of gas bubbles. Where several burners
are installed in one boiler room, it is essential for every burner to
have its own suction pipe.
Only return pipes can lead to a single manifold pipe with an adequate
cross section leading to the tank. Never connect the return pipe
directly to the suction pipe.
It is a good practice to properly heat-insulate the suction and return
pipes to prevent functionally damaging cooling. Pipe diameters (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 this limit is exceeded
normal pump operation will no longer be guaranteed.
Maximum suction and return pressure = 1 bar.
GENERAL OUTLINE DIAGRAM OF HYDRAULIC CIRCUIT
1 - Foot valve
2 - Air regulation servomotor
3 - 2
nd
flame nozzle
4 - 1
st
flame nozzle
5 - Safety valve normally closed
6 - 12 bar pump
7 - Valve normally closed
Note: Pressure loss in hydraulic circuit TBML 80 PN = 1 bar
TBML 160 PN = 2 bar
AUXILIARY PUMP
In some cases (excessive distance or difference in level) it is
necessary to install a “loop-type” supply system with an auxiliary
pump, which dispenses with the connection of the burner pump
directly to the tank.
In this case the auxiliary pump can be put into operation when the
burner is started up and cut-off when the it stops.
The electric wiring of the auxiliary pump is made by connecting the
coil (230 V) which controls the pump remote control switch to the
pump and terminals 2 (N) and 17 of the printed circuit.
It is important to comply strictly with the previsions set forth here
below:
• The auxiliary pump should be installed as near as possible to
the fuel to be sucked.
• The head should meet the requirements of the system used.
• We recommend a delivery rate equal to at least that of the
burner pump.
• Connection pipes should be sized to cope with the delivery rate
of the auxiliary pump.
• Do not make the electrical connection of the auxiliary pump
directly directly to the remote control switch of the burner motor.
SUCTION
RETURN