ZEC410 VAV Controllers Installation Instructions
4
7.
Note the direction, clockwise (CW) or counterclockwise (CCW), required to close the damper. The actuator
setup depends on the necessary amount of rotation required for the damper to go from full-open to full-closed.
For 90° rotation, install the damper full-closed. For 45° or 60° rotation, install the damper full-open.
8.
Push down and hold the Manual Override button and turn the ZEC controller coupler until it contacts the
mechanical end-stop at either the full-closed or full-open position.
9.
If the damper for a 45° or 60° box closes CCW, rotate the coupler to the CW mechanical limit. If the damper for
a 45° or 60° box closes CW
,
rotate the coupler to the CCW mechanical limit. This action sets the open end-
stop; the closed end-stop is set by the closed damper.
For 45° and 60° boxes, hard stops must be provided at both full-closed and full-open damper positions. By
installing the ZEC controller at the full-open position, the ZEC controller provides the open stop for 45° and 60°
boxes. The closed damper seal provides the full-closed stop.
10. Tighten the square coupler bolt to the shaft using an 8 mm (5/16 in.) wrench or 10 mm (3/8 in.) 12-point socket.
Tighten to 10.5 to 11.5 N·m (95 to 105 lb·in).
11. Put a loop in the poly tubing, to trap condensation, when you attach the poly tubing to the ZEC pressure
transducer ports. Loop the poly tubing before you make the final connections.
12. Push the Manual Override button, and turn the actuator coupling manually to ensure that the actuator can
rotate from full-closed to full-open positions without binding.
13. Complete the mounting by rotating the damper to the full-open position.
Figure 2: Manual Override and Coupler
