If the unit is provided with the servo control option with spring-operated return (see an example in the figure below),
the servo controls of the dampers must be inverted in addition to inverting the signals that control the damper servo
controls in the terminal board and to re-placing the outside air probe.
Access to the servo controls requires removal of the closing plates (sizes from 25 to 50) or of the rear fixed panel
(sizes from 60 to 190).
The position of the two servo controls is inverted as described below.
1 - Disconnect the servo controls from the power and signal cables (refer to the wiring diagram of the unit).
2 - Unscrew the bolts (either one or two depending on the servo control model) to loosen the U-shaped hook and take
the actuator out of the pin in the damper.
3 - Change the position of the servo controls: fit the servo control into the pin in the damper and place the anti-rotation
bracket in the slot under the actuator. The servo control must be perpendicular to the damper pin.
D1
The references in the figure show:
- B1 = return air servo control in factory position;
- D1 = outside air servo control with spring-operated return in factory position.
4 - Manually anchor the bolts to the U-shaped hook and tighten them at a torque of 11 to 14 Nm. Beware that the
servo control with spring-operated return must be installed with the visible side as supplied from the factory.
5 - Connect the servo control following the wiring diagram.
Translation from original instructions
Packaged Rooftop
44
Fig. 18 Servo control with spring-operated return
Fig. 19 Bolts to be unscrewed
B1
Fig. 20 Replacing the damper servo controls
D1
B1
We reserve the right to make changes without any prior notice.
UATYA
4P645202-2