Thermal Relay Adjustment - Riello RS 55/M BLU Installation, Use And Maintenance Instructions

5.11

Thermal relay adjustment

This is required to avoid motor burn-out in the event of a signifi-
cant increase in intake power caused by a missing phase.
– If the motor is star-powered, 400V, the cursor should be po-
sitioned at "MIN".
– If the motor is delta-powered, 230V, the cursor should be po-
sitioned at "MAX".
– Even if the scale of the thermal relay does not include rated
motor input power at 400V, protection is still ensured in any
case.
NOTE:
The burner leaves the factory set for electrical supply at 400V. If
230V power supply is used, change the motor connection (from star
to delta) and change the calibration of the thermal relay as well.
The burners leave the factory ready for two-stage functioning and
must therefore be connected to the thermostat/pressure switch
TR. Alternatively, if single stage operation is required, instead of
thermostat/pressure switch TR install a jumper lead between ter-
minals T6 and T8 of 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
switch must be removed.
In addition, the function Q13 - Q14 of the regulator RWF can sub-
stitute 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 work-
ing of the regulator RWF.
Installation
21 GB
D867
Fig. 20
20040559