20
1.54
Ultra
Comfortable indoor climate in high-end interiors
Installation and operating instructions
The fan runs when control voltage is applied or the stored fan speed starts
up automatically when mains power fails.
• Do not go near the hazard area of the unit.
High temperatures are produced at the fan’s electronic housing.
• Combustion hazard.
The fan is protected from blockage. Protective functions are integrated
depending on the fan type, which cause the fan to switch off automatically
in the event of diverse faults.
• Please refer to the operating instructions for the respective fan for further
information!
Please read these instructions in full to ensure correct and proper installation
and the correct operation of Ultra unit heaters.
10.2 Motor protection
10.2.1 AC fans
Thermal contacts (temperature monitors) are embedded in the motor
windings, which open when the maximum winding temperature of
155 °C is exceeded. The motor is switched off whenever it impermissibly
heats up combined with an appropriate protective switch. The motor is thus
protected against overload operation, over- and undervoltage, unacceptably
high ambient temperature and the rotor jamming.
Thermal contacts meet the conditions for protecting against overloading
of equipment with electric motor drive (VDE 0730). Commercial motor
protection switch or bi-metal trips are not suitable as motor protection
with multi-stage operated motors. Only appropriately wired controllers or
modules or a similar type of switch may be used.
Single-phase controller
The thermal contacts lock the motor via the single-phase controller each
time the motor heats up inadmissibly.
Continuously variable power module type ... V
The thermal switch off the motor via the stage switch each time the motor
heats up inadmissibly (without locking the motor!). A potential-free NC
contact offers the option to lock the 0-10 V control signal to “0 V” by
means of an on-site controller.
The unit is not short circuit-proof! The device will not work if the motor
cable short circuits. Even when the motor is idle, the motor cables (U1 and
U2) are still carrying mains potential!