Appendix - Riello Burners RS 34/M MZ Instrucciones De Instalación, Funcionamiento Y Mantenimiento

D867
NOTES
• The model RS 44/M MZ three-phase leaves the factory with an electrical supply setting of 400V. If 230V power supply is used, change the
motor connection from star to delta and change the setting of the thermal cutout as well.
• The burners RS 34-44/M MZ have been approved for intermittent operation. This means they should be compulsorily stopped at least once
every 24 hours to enable the control box to perform a check of its own efficiency at start-up. Normally, the stopping of the burner is guaran-
teed by the boiler's thermostat/pressure switch. If this is not the case, a time switch should be fitted in series to IN to provide for burner shut-
down at least once every 24 hours.
• The burners RS 34-44/M MZ leave the factory set for two-phase operation, so the thermostat/pressure switch TR must be connected. If you
want the burner to work with single-phase operation, insert (in place of the thermostat/pressure switch TR) a bridge between the terminals
T6 - T7 of the plug X4.
MODULATING OPERATION
If the output power regulator kit RWF40 or the converter 0...10V / 4...20mA is connected, in 3-point signal, the thermostat/pressure switch TR
must be removed.
Using just the regulator RWF 40 also remove the TL thermostat/pressure switch.
ATTENTION:
!
- Do not invert the neutral with the phase in the electrical supply line. An inversion would lead to lockout due to ignition
failure.
- Replace the components only with original spare parts.

APPENDIX

Electrical connections
RS 34-44/M MZ single-phase
1-
2-
3-
4-
5-
6 - 6A
D3840
RS 44/M MZ three-phase
1-
2-
3-
4-
5-
6 - 6A
ADJUSTMENT OF THERMAL CUTOUT (RS 44/M MZ THREE-
PHASE)
Used to avoid the burning of the motor owing to a strong increase
in the absorption, caused by the lack of a phase.
• If the motor is star-driven, 400V, the cursor must be positioned
on "MIN".
• If it is delta-driven, 230V, the cursor is positioned on "MAX".
If the scale of the thermal cutout does not include the absorption of
rating of the motor at 400V, the protection is guaranteed anyway.
18
NOTES
The electrical wirings must be carried out in conform-
ity with the regulations in force in the countries of des-
tination, and by qualified personnel.
Riello S.p.A. cannot accept any responsibility for mod-
ifications or connections other than those shown in
these diagrams.
Use flexible cables, in accordance with the regulation
EN 60 335-1.
All the cables to be connected to the burner must pass
through cable grommets.
The use of cable grommets can take various forms;
the following way is just one possible solution:
7-pole socket for single-phase power supply, thermo-
stat/pressure switch TL
6-pole socket for gas valves, gas pressure switch or
device for checking the valve seal
4-pole socket for thermostat/pressure switch TR
5-pole socket, not used
2-pole socket for device enabling the remote reset of
the control box
Fittings for pipe unions
(Pierce, if it is necessary to use the pipe unions 6A)
7-pole socket for single-phase power supply, thermo-
stat/pressure switch TL
6-pole socket for gas valves, gas pressure switch or
device for checking the valve seal
4-pole socket for thermostat/pressure switch TR
5-pole socket for three-phase power supply
2-pole socket for device enabling the remote reset of
the control box
Fittings for pipe unions
(Pierce, if it is necessary to use the pipe unions 6A)