Unigas PBY70, Manual Of Installation - Use - Maintenance, Page: 10 / 44

C.I.B. UNIGAS - M039241CB
10
Electrical connections
To execute the electrical connections, proceed as follows:
1 remove the cover from the electrical board, unscrewing the fixing screws;
2 execute the electrical connections to the supply terminal board as shown in the wiring diagrams (see related chapter),
3 check the direction of the fan and pump motors (see next pargraph)
4 refit the panel cover
Fan motor and pump motor direction
Once the electrical connection of the burner is performed, remember to check the rotation of the motor. The motor should rotate accor-
ding to the arrow shown on the next picture. In the event of incorrect rotation reverse the three-phase supply and check again the rota-
tion of the motor.
NOTE: burners are supplied for three-phase 400 V supply, and in the case of three-phase 230 V supply it is necessary to modify the
electrical connections inside the terminal box of the electric motor and replace the thermal cutout relay.
Respect the basic safety rules. Make sure of the connection to the earthing system. do not reverse the phase and
neutral connections. Fit a differential thermal magnet switch adequate for connection to the mains.
ATTENTION: before executing the electrical connections, pay attention to turn the plant’s switch to OFF and be
sure that the burner’s main switch is in 0 position (OFF) too. Read carefully the chapter “WARNINGS”, and the
“Electrical connections” section.
WARNING: The burner is provided with an electrical bridge between terminals 6 and 7; when connecting the
high/low flame thermostat, remove this bridge before connecting the thermostat.
IMPORTANT: Connecting electrical supply wires to the burner teminal block MA, be sure that the ground wire is
longer than phase and neutral ones.
Auxiliary contacts are provided (terminals no. 507 and no. 508 of the MA terminal block - see wiring diagrams) to
connect an intervention system (alarm/power supply cutoff) in case of fault of the oil resistor contactor (see
wiring diagram).