Unigas R91 VS Series, Manual Of Installation - Use - Maintenance, Page: 14 / 60

14
Electrical wiring
Remove the cover of the burner electrical board. Effect the electrical connections to the supply terminal board as shown in the following
diagrams, check the direction of the fan motor (see note at end of page) and refit the panel cover.Remove the cover of the burner elec-
trical board. Effect the electrical connections to the supply terminal board as shown in the following diagrams, check the direction of the
fan motor (see note at end of page) and refit the panel cover.
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 motor (see next paragraph)
4 refit the panel cover.
Rotation of fan motor
Once the burner’s electrical connection is accomplished, remember to check the rotation of the fan motor. The motor should rotate in
counterclockwise direction looking at motor’s cooling fan. In case of incorrect rotation, reverse the three-phase supply and check again
the rotation of the motor.
NOTE (exceptR525..VS): the burners are supplied for three-phase 400V supply, and in the case of three-phase 230V supply it
is necessary to modify the electrical connections into the terminal box of the electric motor and replace the overload tripped
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 a jumper between terminals 6 and 7; in the event of connecting the high/low
flame thermostat remove this jumper before connecting the thermostat.
IMPORTANT: while connecting electric supply wires to burner’s teminal block be sure that ground wire should be
longer than phase and neutral ones.