Mounting the FW-VAV controller - EasyIO - LIT-12013983 - Building Management - FW-VAV Variable Air Volume Controller

FW-VAV Quick Start Guide
Product
Document type
Quick Start Guide
Document number
LIT-12013983
Document revision
0
Revision date
2023-08-16

Procedure

  1. Ensure that the controller base is parallel to the VAV box and perpendicular to the damper shaft. If the shaft bushings make the mounting surface uneven, use a spacer to create an even surface.
    Note: To ensure sufficient movement in either direction, use the alignment marks to center the captive spacer.
  2. Secure the self-drilling No. 10 screw through the captive spacer with a power screwdriver and a 100 mm (4 in.) extension socket. Alternatively, you can use a punch to mark the position of the shoulder washer, and then drill a hole into the VAV box with a 3.5 mm (0.14 in.) drill bit. Insert the mounting screw and tighten it against the spacer.
    Important: To avoid stripping the threads, do not overtighten the screw.
    Important: If you mount the controller to the VAV box, ensure that the screws do not interfere with damper blade movement.
  3. Locate the damper position. Use the typical marking on the end of the damper shaft as shown in the following figure.
    Figure 1. Typical damper end shaft markings
  4. Note if the direction to close the damper is clockwise (CW) or counterclockwise (CCW). Grasp the damper shaft firmly with pliers, and choose one of the following options:
    • For 90° boxes, manually close the damper.
    • For 45° and 60° boxes, manually open the damper.
  5. Press and hold the Manual Override button. For more information, see Manual override in myy1637148822139.html#myy1637148822139__table_wkn_f4v_prb. Turn the controller coupler until it contacts the mechanical end-stop at one of the following positions:
    • For 90° boxes, turn the controller coupler until it contacts the mechanical end-stop at the full-closed position.
    • For 45° and 60° boxes, turn the controller coupler until it contacts the mechanical end-stop at the full-open position.
  6. To set the open end-stop, complete one of the following options:
    • For 90° boxes, if the damper closes CCW, rotate the coupler to the CCW mechanical limit. If the damper closes CW, rotate the coupler to the CW mechanical limit.
    • For 45° and 60° boxes, provide hard stops at both full-closed and full-open damper positions. When you install the controller at the full-open position, the controller provides the open stop for 45° and 60° boxes. The closed damper seal provides the full-closed stop.
    Note: The integrated actuator has a stroke time of 60 s for 90° of travel. The stroke time is the amount of time in seconds that it takes the actuator to move from the fully closed to the fully opened position or from the fully open to the fully closed position. For 45° and 60° box stroke times, adjust the drive time in the application. Calculate the new drive time so that the actuator precisely controls the damper, which is a time-based control. To calculate the drive time for 45° and 60° boxes, see Calculating the drive time for 45° and 60° boxes.
  7. Tighten the square coupler bolt to the shaft with an 8 mm (0.31 in.) wrench or 10 mm (0.38 in.) 12-point socket. Tighten the coupler bolt to 10.5 N m (7.9 lb ft) to 11.5 N m (8.3 lb ft.)
    Note: The models have either a round shaft with a diameter of up to 13 mm (0.51 in.), or a 10 mm (0.39 in.) square shaft.
  8. Loop the pneumatic tubing supply to include a trap for condensation. Field personnel must supply the pneumatic tubing. Take the length of tubing you require and attach one end to the dual port fitting on the controller, and attach the other end of the tubing to the pressure transducer in the VAV box application.
    Note: The controller uses a digital differential pressure (DP) sensor with bidirectional flow operation. You can connect the high-pressure and low-pressure DP tubes to either barbed fitting on the controller. You do not need to make a specific high-side or low-side connection when you attach the tubing to the barbed fittings on the controller.
  9. Press 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.
  10. Rotate the damper to the full-open position.
    CAUTION
    Risk of property damage. Rotate the damper to the full-open position before you start the air handler. If you do not to rotate the damper to the full-open position when the air handler starts, you can damage to the VAV box or ductwork.