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Electrical connections
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.
CAUTION: auxiliary contacts are provided (terminals no. 507 and no. 508 of the MA terminal block) to connect an
intervention system (alarm/power supply cutoff) in case of fault of the oil resistor contactor (see Fig. 2-Fig. 3).
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 following diagrams,
3
check the direction of the fan-pump motor (see next pargraph)
4
refit the panel cover.
Fig. 1 - Fully modulating burners
Fig. 2Progressive burners
Fig. 3 - Fully modulating burners
(#) Free contact for "Faulty heater resistor contactor"
(**) Probes connection (see Fig. 4)
Probes connection oby means of the 7-pins plug (Fig. 5) - see Fig. 4 for
connections.
C.I.B. UNIGAS
Fig. 5
MA
MA
13
Probes connection
Fig. 4
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