Appendix; Electrical Connections - Riello RL 28/M Electrical Installation, Use And Maintenance Instructions

APPENDIX - ELECTRICAL CONNECTIONS
The electrical wirings must be carried out in conformity with the regulations in force in the countries of destination, and by
qualified personnel.
Riello S.p.A. cannot accept any responsibility for modifications or connections other than those shown in these diagrams.
WARNING
IMPORTANT
The burner is factory set for low - high operation and it must be connected to the OCR control device to control fuel oil valve V2.
If on - off operation is required, instead of control device OCR install a jumper lead between terminals T6 and T8 of burner terminal strip.
NOTES
FIELD WIRING CONNECTIONS
• For electrical connection use flexible cables according to local Regulations.
• The setting of the thermal overload must be according to the total burner amperage draw.
• The RL 38/M - 50/M three-phase burners leave the factory preset for:
- 208-230V power supply: only in this case, if 460V power supply is required, change the fan motor connection from delta to double star
and change the setting of the thermal overload as well;
- or 575V power supply;
depending on the burner model (see page 3).
• The RL 50/M single-phase burner leaves the factory preset for 120V power supply: if 230V power supply is required, change the fan motor
connection as shown in Figure below.
The RL 28/M - 38/M - 50/M burners have been type-approved for intermittent operation. This means they should compulsorily be stopped at
least once every 24 hours to enable the control box to check its own efficiency at start-up. Burner halts are normally provided for automati-
cally by the boiler load control system.
If this is not the case, a time switch should be fitted in series to OC to provide for burner shut-down at least once every 24 hours.
EXTERNAL FUSES (TO SEE THE ELECTRICAL DIAGRAM)
RL 28/M - 38/M - 50/M Single-phase burners
RL 28/M
120V
FU1 (A) T10
FU2 (A)
RL 38/M- 50/M Three-phase burners
208/230V
FU1 (A) T6
FU2 (A) T6
- Do not invert the neutral with the phase wire in the electricity supply line.
- Only use original spare parts to replace the components.
WARNING
A B C D E
120V
RL 38/M RL 50/M
120V 120V
T10 T15
T6
460V 575V
T6 T4
T6 T6
A B C D
230 V
230V
T10
15
E