APPENDIX
D867
ADJUSTMENT OF THERMAL CUTOUT
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.
Electrical connections
The electrical wirings must be carried out in conformity
with the regulations in force in the countries of destina-
tion, and by qualified personnel.
Riello S.p.A. cannot accept any responsibility for modifications 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:
1- Pg 11
Three-phase power supply
2- Pg 11
Single-phase power supply
3- Pg 9
Remote control device TL
4- Pg 9
Remote control device TR or probe (RWF)
5- Pg 11
Gas valves
(when RG1/CT or LDU 11 leak detection control
device is not fitted)
6- Pg 11
Gas pressure switch or gas valve leak detection
control device
D3999
NOTES
45
• The model RS 64/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 64/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 guaranteed 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 64/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 - T8 of the
plug X4.
MODULATING OPERATION
If the output power regulator kit RWF or the converter 0...10V / 4...20mA is connected, in 3-point signal, the thermostat/pressure.
In addition, the function Q13 - Q14 of the regulator RWF can substitute the thermostat/pressure switch TL.
In this case, the thermostat/pressure switch TL connected to the X7 must be bypassed.
On the contrary, if you want to maintain the thermostat/pressure switch TL, it must be adjusted so as not to interfere with the working of the regulator
RWF.
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.
