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4.11
Thermal relay adjustment
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, 400V, the cursor 2) should be
positioned to "MAX" (see the wiringin diagram).
If it is delta-powered, 230V, the cursor 2) should be
positioned to "MIN" (see the wiringin diagram).
In case of an intervention of the thermal relay, check the
cause, to unlock 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 three-phase models leave the factory pre-set for 400V power
supply.
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 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.
The automatic reset can be dangerous.
This operation is not foreseen in the burner oper-
ation.
WARNING
20151835
Installation
20150323
22
GB
1
D867
2
Fig. 24
Fig. 25
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