Riello RS 50 - 5.11 Thermal relay adjustment (RS 38-50 THREE-PHASE)

23
20144599
GB
Installation
5.11 Thermal relay adjustment (RS 38-50 THREE-PHASE)
This is required to avoid motor burn-out in the event of a
significant increase in power absorption caused by a missing
phase.
 If the motor is star-powered, 400 V, the cursor 2) should be
positioned to "MIN".
 If it is delta-powered, 230 V, the cursor 2) should be
positioned to "MAX".
 In case of an intervention of the thermal relay, press button
1).
Even if the scale of the thermal relay does not include rated motor
absorption at 400 V, protection is still ensured in any case.
The RS 38 and RS 50 three-phase models leave the factory pre-
set for 400 V power supply. If 230 V power supply is used,
change the motor connection from star to delta and change the
calibration of the thermal relay as well.
The RS 28-38-50 burners leave the factory ready for two-stage
operation and must therefore be connected to the TR remote
control.
Instead, if burner single-stage operation is required, replace the
TR remote control with a jumper between terminals T6 - T7 of
plug X4.
Fig. 22
20141664
Fig. 23
D867