baltur BT 17N, Instruction Manual For Installation, Use And Maintenance

Page: 48 / 66

ENGLISH
48 / 64
0006160045_201802
SUPPLY LINE
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 supply circuit can be realized without pressure regulator, using
the dedicated hydraulic diagram.
The burner tank connection pipes must be perfectly airtight. It is
recommended to use copper or steel pipes of a suitable diameter.
The pipe dimensioning must be carried out according to the pipe
length and the flow rate of the installed pump.
These instructions ensure a good operation of the product.
At the end of the rigid pipes, fuel shut-off gate valves must be installed.
Install the filter on the suction piping after the gate, then connect
the hose to the burner pump's suction coupling nipple; all parts are
supplied with the burner.
The pump is provided with specific connections to fit control
instruments (pressure gauge and vacuum gauge).
For a safe and silent operation, the suction vacuum cannot exceed 35
cm/Hg corresponding to 0.46 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.
Maximum suction and return pressure = 1 bar.
When the viscosity of the fuel oil used exceeds the pumping limit,
(see diagram) it is necessary to heat the oil in order to ensure that it
flows through the pipes.
When the viscosity of the fuel oil used exceeds the pumping limit,
(see diagram) it is necessary to heat the oil in order to ensure that it
flows through the pipes.
Pre-heating in the tank can be carried out with a steam coil or with
hot water.
The coil should be fitted near the intake pipe and must always be
immersed even when the tank is at the minimum level.
The size of the pre-heater should be decided after consulting the
viscosity - temperature diagram.
AUXILIARY PUMP
In some cases (excessive distance or differences in level) the system
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 wiring of the auxiliary pump is made by connecting the
coil (230V) which controls the pump remote control switch in parallel
to the motor-fan remote switch coil.
Always follow the instructions 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 equal at least to that of the burner
pump.
• The connection pipes must be dimensioned based on the flow rate
of the auxiliary pump.
• Avoid electrically connecting the auxiliary pump directly to the
remote control switch of the burner.
ON-OFF HYDRAULIC CIRCUIT SCHEMATIC DIAGRAM FOR FUEL OIL
PS
1
2
9 8
6 7
5
3
4
10
0002900271
1 1st stage normally open valve
2 Nozzle fuel return
3 Suction
4 Foot valve
5 Burner pump (22 bar)
6 Pre-heater tank
7 Filter with gas valve (∆p 2 ÷ 2.5 bar)
8 Nozzle closure device
9 Nozzle
10 Pressostato di massima combustibile liquido
1-16 bar (adjust to 5 bar)