Fan Motor Direction; Connecting The Oil Heating Resistors; Double-Pipe And Single-Pipe System - Unigas PN91 Manual Of Installation - Use - Maintenance

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

Double-pipe and single-pipe system

The pumps that are used can be installed both into single-pipe and double-pipe systems.
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 pulg, 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 pum'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.
Burners come out from the factory provided for double-stage systems. They can be suited for single-pipe system (recommended in the
case of gravity feed) as decribed before.
To change from a 1-pipe system to a 2-pipe-system, insert the by-pass plug G (as for ccw-rotation- referring to the pump shaft).
Caution: Changing the direction of rotation, all connections on top and side are reversed.
Bleed
Bleeding in two-pipe operation is automatic: it is assured by a bleed flat on the piston. In one-pipe operation, the plug of a pressure
gauge port must be loosened until the air is evacuated from the system.
C.I.B. UNIGAS - M039196CC
230V
R1
L2
L1
R2
R3
L3
Fig. 5
230V
L1
R1
R2
R6
L2
R3
R5
R4
L3
Fig. 7
Danfoss KSM..
G
400 V
R1
L1
R6
R5
L3
ELECTRIC MOTOR CONNECTION
400 V
W2 U2
L2
U1 V1
L1 L2
Suntec TA
G
11
8 - 12 kW
230V
L1
R2
R6
L2
R3 R5
R4
R4
L3
Fig. 6
230V
V2
W2 U2
W1
U1 V1 W1
L1 L2
L3
Fig. 8
R1
L2
R2
R3
V2
L3