14 Instruction manual ST523 / ST853
Please keep this instruction manual for future reference
T I M I N G
› This product is equipped with intelligent electronics which include a timer device for speed
controls when the air capacity exceeds 650m³/h. Internal motor models, with maximum air
capacity higher than 650m³/h, are equipped with a timer device that automatically switches
the speed from 4th to 3rd speed, after 5 minutes operation.
› External motor models are equipped with remote motors that, as for internal motor
versions, include a timer device that switches down the speed when it exceeds 650 m³/h.
(See External Motors Instructions). Remote motors, whose air capacity exceeds 650m³/h
at both 4th and 3rd speed, will have the following by default timer control functions: The
speed is automatically switched from 4th to 2nd speed, after 6 minutes operation.
› If the appliance is working at 3rd speed, it is automatically switched to 2nd speed, after
7 minutes operation. Operation speeds can also be changed during operation. The energy
consumption of the appliance in standby mode is lower than 0.5W.
