Appendix - Riello RS 44/M MZ Installation, Use And Maintenance Instructions

NOTES
• 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
19
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 max gas pressure switch accessory
Fittings for pipe unions
(Pierce, if it is necessary to use the pipe unions 6A)