baltur COMIST 20 Installation, Use And Maintenance Instruction Manual page 53

HYDRAULIC CONNECTIONS
The burner tank connection pipes must be perfectly airtight. We
recommend the use of copper or steel pipes of a suitable diameter.
The unit is equipped with a self-priming pump capable of sucking oil
directly from the tank also for the first fill-up.
To ensure an efficient operation, it is necessary 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 correct operation.
Where a removable coupling is required, use the welded flange
method inserting a fuel resistant gasket to obtain a positive sealing.
Do not connect the return pipe directly to the suction pipe.
Only return pipes can lead to a single manifold pipe with a suitable
cross section leading to the fuel tank.
The suction pipe should run up-slope towards the burner to avoid
possible formation of gas bubbles.
The fuel supply pressure to the burner pump must not change both
with burner off and with working burner at the maximum fuel output
required by the boiler.
The pump is provided with specific connections to fit control
instruments (pressure and vacuum gauge).
For a safe and silent operation, the suction vacuum must not exceed
35 cm/Hg equal to 0.46 bar.
The suction and return pressure must not exceed 1.5 bar.
The anti-pollution prescriptions, as well as the provisions set forth by
the local authorities, refer to the specific publications in force in the
country where the product will be installed.
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1 Diesel fuel solenoid valve
2 Pump (pressure 12 bar)
3 Foot valve
4 Return
5 Suction
6 Nozzle output flow-rate
1 Normally closed solenoid valve
2 Pressure gauge connector and air vent (1/8" G)
3 Pressure regulation screw
4 Return
5 Suction
6 Delivery to nozzle
7 Vacuum gauge connector (1/8" G)
CAUTION / WARNING
The pump is preset at a pressure of 12 bar
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ENGLISH
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