Mounting the ZEC controller - Verasys - LC-ZEC410-x - Field Device - ZEC410

Verasys ZEC410 VAV Controllers Installation Guide
Brand
Verasys
Product name
ZEC410
Document type
Installation Guide
Part number
24-10143-1264
Document revision
C
Revision date
2019-10-04
Language
English

Procedure

  1. Disconnect power from the controller transformer, and 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 end-of-line (EOL) is set to the off position. Refer to the Verasys Zone Coordinator Installation Guide (Part No. 24-10143-1280) for proper switch setting.
  5. Use the zone bus address/range 4-127 for Verasys Zone Bus controllers.
  6. Place the ZEC controller in the proper mounting position on the actuator shaft so that the wiring connections are easily accessible.
  7. Make sure the ZEC controller base is perpendicular to the damper shaft. If necessary, use a spacer to offset tipping of the ZEC controller caused by the shaft bushings.
    Note: Use the alignment marks to center the captive spacer to ensure sufficient ZEC 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 drill 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, or the threads may 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 typical 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 full-open to full-closed.
    • For 90° rotation, install the damper full-closed.
    • For 45° or 60° rotation, install the damper full-open.
  13. Push down and hold the manual override button and turn the ZEC controllercoupler until it contacts the mechanical end-stop at either the full-closed orfull-open position.
    Figure 2. Manual override and coupler

    Table 1. Manual override and actuator coupler
    Callout Description

    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, hard stops must be provided at both full-closed and full-open damper positions. If you install 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.

  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 to 11.5 N·m (95 to 105 lb·in).
  16. 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.
  17. 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.
  18. Complete the mounting by rotating the damper to the full-open position.