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Fan motor direction ( and pump motor direction only for PN520 - PN525)
Once the electrical connection of the burner is performed, remember to check the rotation of the motor. The motor should rotate in an
counterclockwise direction looking at cooling fan. In the event of incorrect rotation reverse the three-phase supply and check again the
rotation of the motor.
Connecting the oil heating resistors
2.4 - 4.5 kW
400 V
R1
L2
L1
R2
R3
L3
18 - 24 kW
400 V
L1
R1
R6
R2
R5
R3
R4
L3
About the use of fuel pumps
Do not use fuel with additives to avoid the possible formation over time of compounds which may deposit between the gear teeth,
thus obstructing them.
After filling the tank, wait before starting the burner. This will give any suspended impurities time to deposit on the bottom of the
tank, thus avoiding the possibility that they might be sucked into the pump.
On initial commissioning a "dry" operation is foreseen for a considerable length of time (for example, when there is a long suction
line to bleed). To avoid damages inject some lubrication oil into the vacuum inlet.
Care must be taken when installing the pump not to force the pump shaft along its axis or laterally to avoid excessive wear on the
joint, noise and overloading the gears.
Pipes should not contain air pockets. Rapid attachment joint should therefore be avoided and threaded or mechanical seal jun-
ctions preferred. Junction threads, elbow joints and couplings should be sealed with removable sg component. The number of jun-
ctions should be kept to a minimum as they are a possible source of leakage.
Do not use PTFE tape on the suction and return line pipes to avoid the possibility that particles enter circulation. These could depo-
sit on the pump filter or the nozzle, reducing efficiency. Always use O-Rings or mechanical seal (copper or aluminium gaskets) jun-
ctions if possible.
An external filter should always be installed in the suction line upstream the fuel unit.
ATTENTION: before the burner first start, it is mandatory to fill the adduction pipes with diesel fuel and bleed out residual
air bubbles. Prior to switching on the burner, check direction of rotation of the pump motor by briefly pressing the starter
switch; ensure there are no anomalous sounds during equipment operation, and only then turn on the burner. Neglect to
comply with this requirement will invalidate the burner warranty.
Depending on the installed pump, it is possible to design the plant for single or double pipe feeding line
Single-pipe system: a single pipe drives the oil from the tank to the pump's inlet. Then, from the pump, the pressurised oil is driven to
the nozzle: a part comes out from the nozzle while the othe part goes back to the pump. In this system, the by-pass plug, if provided,
must be removed and the optional return port, on the pump's body, must be sealed by steel plug and washer.
Double-pipe system: as for the single pipe system, a pipe that connects the tank to the pump's inlet is used besides another pipe that
connects the pump's return port to the tank, as well. The excess of oil goes back to the tank: this installation can be considered self-ble-
eding. If provided, the inside by-pass plug must be installed to avoid air and fuel passing through the pump.
230V
R1
L2
L1
R2
R3
L3
Fig. 6
230V
L1
R1
R2
R6
L2
R3
R5
R4
L3
Fig. 8
C.I.B. UNIGAS
400 V
R1
L1
R6
R5
L3
ELECTRIC MOTOR CONNECTION
400 V
W2
U2
L2
U1
V1
L1
L2
14
8 - 12 kW
230V
L1
R2
R6
L2
R3
R5
R4
R4
L3
Fig. 7
230V
V2
W2
U2
W1
U1
V1
W1
L1
L2
L3
Fig. 9
R1
L2
R2
R3
V2
L3
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