Appendix - Riello RS 34 MZ Installation, Use And Maintenance Instructions

D867
NOTES
• The RS 44 MZ three-phase model leaves the factory with provision for a 400V power supply. If 230V power supply is used, change the
motor connection from star to delta and change the setting of the thermal cut-out as well.
• The RS 34 -44 MZ -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. Normally, the stopping of the burner is guar-
anteed 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 shutdown at least once every 24 hours.
• The burners RS 34-44 MZ leave the factory ready for two-stage operation and must therefore be connected to the thermostat/pressure
switch TR. 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 - T8 of the plug X4.
Warning:
!
- Do not invert the neutral with the phase in the electrical supply line. An inversion would lead to lockout due to fir-
ing failure.
- Replace the components only with original spare parts.

APPENDIX

Electrical connections
RS 34-44 MZ single phase
1-
2-
3-
4-
5-
6 - 6A
D3840
RS 44 MZ three-phase
1-
2-
3-
4-
5-
6 - 6A
ADJUSTMENT OF THERMAL RELAY (RS 44 MZ THREE PHASE)
This is required to avoid motor burnout in the event of a significant
increase in power absorption caused by a missing 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 cut-out does not include the absorption of
rating of the motor at 400V, the protection is guaranteed anyway.
20
NOTES
The electrical wiring 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 modifica-
tions or connections other than those shown in these dia-
grams.
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 fol-
lowing lists show one possible solution:
7-pole socket for single-phase power supply, thermostat/
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 accessory min. gas pressure switch
Fittings for pipe unions
(Pierce, if it is necessary to use the pipe unions 6A)
7-pole socket for single-phase power supply, thermostat/
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 accessory min. gas pressure switch
Fittings for pipe unions
(Pierce, if it is necessary to use the pipe unions 6A)