baltur TBML 50 ME Bedienungsanleitung Seite 12

DIESEL OIL SUPPLY LINE
The following description covers merely the basic requirements for
an efficient operation.
The unit is equipped with a self-suction pump, capable of sucking oil
directly from the tank also for the first fill-up. This is true as long as
the required conditions exist, see pipe sizing diagrams. To ensure
efficient operation, it is preferable to make intake and return pipes
with welded fittings and to avoid the use of threaded connections
which often cause air infiltrations and disturb pump operation and
consequently burner operation. Where a removable coupling 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 pipes.
For unavoidable joints we recommend the use of 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 possible build-up of gas bubbles. Where more burners are
installed in one boiler room, it is essential that every burner has 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 hazardous cooling. pipe diameters (to be strictly
complied with) are listed in the following tables. The maximum
amount of vacuum that the pump can withstand noiselessly under
normal operating conditions is 35 cm.hg.; if these limit is exceeded
normal pump operation will no longer be guaranteed.
Maximum suction and return pressure = 1 bar.
HYDraULiC CirCUiT sCHemaTiC Diagram
SUCTION
1
2
3
4
5
6
7
RETURN
Foot valve
Air regulation servomotor
2 flame nozzle
nd
1 flame nozzle
st
Normally closed safety valve
pump (12 bar)
Normally closed valve
0006160034_201307
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, thus avoiding the burner pump from being directly connected
to the tank.
In this case, the auxiliary pump can be started with the burner starts
and stopped when 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
terminals 1 and 3 of the connector "X25" on the BT 340 equipment.
Always follow the instructions below:
• The auxiliary pump should be installed as near 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.
• Connection pipes should be sized to cope with the flow rate of
the auxiliary pump.
• Do not connect the auxiliary pump directly to the remote control
switch of the burner motor.
pressure loss in hydraulic circuit
TBML 50 ME
10 / 30
1 bar