Observe the following guidelines when mounting CH-PCV:
Ensure that the mounting surface can support the CH-PCV and any user-supplied enclosure.
Mount the CH-PCV on a hard, even surface whenever possible.
Use shims or washers to mount the CH-PCV securely and evenly on the mounting surface.
Mount the CH-PCV in an area free of corrosive vapors that matches the ambient conditions specified in the Technical Specifications section.
Provide sufficient space around the CH-PCV for cable and wire connections and adequate ventilation through the controller (at least 50 mm [2 in.] on the top, bottom, sides, and front of the controllers).
Do not mount the CH-PCV in areas where electromagnetic emissions from other devices or wiring can interfere with controller communication.
- Avoid mounting the CH-PCV on surfaces with excessive vibration.
On panel or enclosure mount applications, observe these additional guidelines:
Do not install the CH-PCV in an airtight enclosure.
Mount the CH-PCV so that the enclosure walls do not obstruct cover removal or ventilation through the controller.
Mount the CH-PCV so that the power transformer and other devices do not radiate excessive heat to the controller.
To mount the CH-PCV controllers, complete the following steps:
- Set all the switches on the controller to their known settings.
- Place the CH-PCV controller in the proper mounting position on the damper shaft
so that the wiring connections are easily accessible. Make sure the CH-PCV controller base is parallel to the
VAV box (perpendicular to the damper shaft). If needed, use a spacer to offset
tipping of the CH-PCV controller
caused by the shaft bushings.
Note: Use the alignment marks to center the captive spacer to ensure sufficient movement in either direction.
- Secure the self-drilling No. 10 screw
through the captive spacer (Figure 1)
with a power screwdriver and 100 mm (4 in.) extension socket. Otherwise, use a punch
to mark the position of the shoulder washer, and then drill a hole into the VAV box
using a 3.5 mm (9/64 in.) drill bit. Insert the mounting screw and tighten against
Important: Do not overtighten the screw, or the threads may strip. If mounting to the VAV box, make sure the screws do not interfere with damper blade movement.
- Locate the damper position using the
typical marking on the end of the damper shaft as shown in the following figure.
Figure 1. Typical Damper End Shaft Icons
- Note the direction, clockwise (CW) or counterclockwise (CCW), required to close the damper. Grasp the damper shaft firmly with pliers, and either manually close the damper for 90° boxes or manually open the damper for 45° or 60° boxes.
- Push down and hold the Manual Override button and turn the controller coupler until it contacts the mechanical end-stop at either the full-closed (90° boxes) or full-open (45° and 60° boxes) position.
- If the damper for a 90° box closes CCW, rotate the coupler to the CCW mechanical limit. If the damper for a 90° box closes CW, rotate the coupler to the CW mechanical limit. The open end-stop is automatically set for 90° boxes. For 45° and 60° boxes, hard stops must be provided at both full-closed and full-open damper positions. By installing the CH-PCV controller at the full-open position, the CH-PCV controller provides the open stop for 45° and 60° boxes. The closed damper seal provides the full-closed stop.
- All models are compact in size and can be easily installed on VAV boxes. The models have either a round shaft up to 13 mm in diameter or a 10 mm square shaft. 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).
- Loop the
pneumatic tubing (supplied by field personnel) to include a trap for condensation.
Attach the needed length of tubing (supplied and installed by field personnel) to
the dual port fitting on the CH-PCV controller and the other ends of the
tubing to the pressure transducer in the VAV box application ). Note: The CH-PCV uses a digital non-flow pressure sensor (all models except the ) with bidirectional flow operation. You can connect the high- and low-pressure DP tubes to either barbed fitting on the CH-PCV controller. You do not need to make a specific high- or low-side connection when you attach the tubing to the barbed fittings on the CH-PCV.
- 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.
- Complete the mounting by rotating the damper to the full-open position.