Mounting the ZEC510 - Verasys - Field Device - Verasys ZEC510 Variable Air Volume Controller

To mount the controller, complete the following steps:

1. Disconnect power from the controller transformer, the VAV box fan, and heater circuits if applicable.
2. Set all the switches on the field controller to their known settings. See Setup and adjustments.
3. Set the MS/TP address. See Setup and adjustments.
4. Ensure that the end of line (EOL) switch is set to the off position.
5. Use the zone bus address range 4-127 for Verasys zone bus controllers.
6. Place the ZEC510 on the actuator shaft so that the wiring connections are easily accessible.
7. Ensure that the ZEC510 base is parallel to the VAV box, perpendicular to the damper shaft. If necessary, use a spacer to offset tipping of the ZEC510 caused by the shaft bushings.
   Note: Use the alignment marks to center the captive spacer to ensure sufficient movement in either direction.
   Figure 1. Captive spacer alignment marks
   
   
8. Secure the self-drilling no.10 screw through the captive spacer with a power screwdriver and 100 mm (4 in.) extension socket. Alternatively, use a punch to mark the position of the shoulder washer.
9. Drill a hole into the VAV box using a 5/16 in. drill bit.
10. Insert the mounting screw and tighten it against the spacer.
    Important: Do not over-tighten the screw. Over-tightening can cause the threads to strip. If you mount the ZEC to the VAV box, make sure that the screws do not interfere with damper blade movement.
11. Locate the damper position using the marking on the end of the damper shaft.
12. Note the direction, clockwise (CW) or counterclockwise (CCW), required to close the damper. The actuator configuration depends on the amount of rotation necessary for the damper to go from the full-open to the full-closed position. Decide between the following options:
    • For 90° rotation, install the damper in the full-closed position.
    • For 45° or 60° rotation, install the damper in the full-open position.
13. Push down and hold the manual override button and turn the actuator coupler until it contacts the mechanical end-stop at either the full-closed or full-open position.
    Figure 2. Manual override and actuator coupler
    
    

    Table 1. Manual override and actuator coupler

    1	Manual override button
    2	Actuator coupler

14. If the damper for a 45° or 60° box closes CCW or CW, rotate the coupler to the CW mechanical limit. This action sets the open end-stop; the closed end-stop is set by the closed damper. For 45° and 60° boxes, you must provide hard stops at both full-closed and full-open damper positions. If you install the ZEC510 at the full-open position, it provides the open stop for 45° and 60° boxes. The closed damper seal provides the full-closed stop.
15. 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 N·m to 11.5 N·m (95 lb·in to 105 lb·in).
16. Put a loop in the poly tubing to trap condensation when you attach the poly tubing to the ZEC510 pressure transducer ports. Loop the poly tubing before you make the final connections.
17. Push the manual override button, and turn the actuator coupling manually to ensure that the actuator can rotate from the full-closed to the full-open positions without binding.
18. Rotate the damper to the full-open position.