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 following diagrams,
3
check the direction of the motor (see next pargraph)
4
refit the panel cover
RN515-520-525:
As for the connection of the pump-preheating unit, see wiring diagrams.
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) to connect an intervention system
(alarm/power supply cutoff) in case of fault of the oil resistor contactor (see Fig. 1-Fig. 2).
Fig. 1
-
Progressive burners
Fig. 2 - Fully modulating burners
(#) Free contact for ”Faulty heater resistor contactor”
Probes connection
Fig. 3
Probes connection oby means of the 7-pins plug (Fig. 4) - see Fig. 3) for
connections.
Fig. 4
MA
MA
