Functional characteristics
Damper control
An electrical AC motor is used to close and open the air door. The motor when supplied rounds always in the
same direction. By means of a cam the air door is driven alternatively in open and close position. A signal is
returned to feedback the position of the air door.
The feedback is generated by means of a switch. During the motor running, when the air door reaches the
close position the switch contacts go from close to open status (no feedback at all).
The switch contacts go from open to close status when the air door is completely opened (220Vac Line
feedback).
The control shall detect the voltage rising and falling edge feedback.
The rising edge indicates the air door is completely opened. The falling edge indicates the air door is
activation, the damper alarm will be set, the alarm will be showed only for 10 minutes since power up.
Note: At every power-up a 25 minutes timer will be set in order to perform a complete damper cycle, to avoid
that the sliding part of the damper will be blocked by ice formation (to guarantee a proper work).
4: Baffle Door
Position
Feedback 5: Motor
Control Output
6: To Neutral
Motor
4
5
6
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