Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. PC 111 Catalog No. 533-30014 Printed in U.S.A. Form 33ZC-16SI Pg 1 10-04 Replaces: NewBook 1 4
Tab 11a 13a
Mounting Instructions Part Numbers 33ZCVVTZC-01, 33ZCBC-01
GENERAL
The VVT bypass controller is a component of Carriers 3V control system and is used to regulate the supply duct static pressure for Variable Volume and Temperature Applica- tions. The bypass controller is an essential system component that allows constant volume HVAC (heating, ventilation and air conditioning) equipment to provide zone level temperature control. The bypass controller will need to be mounted on the damper.
The VVT zone controller is a component of Carriers 3V control system and is used to provide zone level temperature and air quality control for Variable Volume and Temperature Applications. The VVT zone controller is a pressure dependent device that maintains space temperature by modulating the amount of supply airflow through its primary damper. An inte- grated 35 in.-lb actuator is standard on all VVT zone control- lers.
The VVT zone controllers are available factory-mounted to Carriers round and rectangular dampers. Round dampers are available in 6, 8, 10, 12, 14, and 16-in. sizes. Rectangular dampers are available in 8x10, 8x14, 8x18, and 8x24-in. sizes. All damper assemblies are equipped with an integrated duct temperature sensor.
TOOLS REQUIRED
1/4-in. nut driver 8-mm wrench or socket No. 1 Phillips head screwdriver
INSTALLATION
Location The zone controller or bypass controller must be mounted on the air terminals damper actuator shaft. For ser- vice access, there should be at least 12 in. of clearance between the front of the controller and adjacent surfaces. See Fig. 1 for dimensions.
Mounting Perform the following steps to mount the controller:
1. Visually inspect the damper and determine the direc- tion in which the damper shaft moves to open the damper clockwise (CW) or counterclockwise (CCW). If the damper rotates CCW to open, it does not require any configuration changes.
If the damper rotates CW to open, then the damper actuator logic must be reversed. This is done in the software when performing system start-up and damper calibration test. Do not attempt to change damper rota- tion by changing wiring. This will upset the damper position feedback potentiometer readings.
2. Rotate the damper shaft to the fully closed position. 3. Press the release button on the actuator and rotate the
clamp in the same direction that was required to close the damper in Step 2.
4. Press the actuator release button and rotate the actuator back one-position of graduation. Release the button and lock the actuator in this position.
5. Mount the controller to the terminal by sliding the damper shaft through the actuator clamp assembly. See Fig. 2 for details. Remove the controller wiring access cover. Secure the controller by installing the screw provided through the grommet in the anti-rotation slot. Detach the grommet from the slot so it can slide from side to side. Be sure the floating grommet is in the cen- ter of the slot. FAILURE TO CENTER THE GROM- MET MAY CAUSE THE ACTUATOR TO STICK OR BIND.
6. Tighten the actuator clamp assembly to the damper shaft. Secure by tightening the two 8-mm nuts.
7. If the damper has less than 90 degrees of travel between the fully open and fully closed positions, then a mechanical stop must be set on the actuator. The mechanical stop prevents the damper from opening past the maximum damper position. To set the mechanical stop, perform the following procedure: a. Press the actuator release button and rotate the
damper to the fully open position. b. Using a No. 1 Phillips screwdriver, loosen the
appropriate stop clamp screw and move the stop clamp so that it contacts the edge of the cam on the actuator.
c. Secure the stop clamp in this position by tighten- ing the screw.
8. Verify that the damper opens and closes. Press the actuator release button and rotate the damper. Verify that the damper does not rotate past the fully open position. Release the button and lock the damper in the fully open position.
9. Bypass Controller Only: Remove the cover from the bypass controller. Install field-supplied 1/4-in. pneumatic tubing (rated for the application) from the high-side pressure transducer to the system pressure pick-up. Connect to the P1 port of the airflow transducer. Be careful to avoid sharp bends in the tubing, because malfunctions may occur if the tubing is bent too sharply. For best operation, use at least 2 ft of tubing. Replace cover.
IMPORTANT: This document contains mounting information only. Refer to the Installation, Start-Up, and Configuration manual for zone controller and bypass controller installation. Refer to the Installa- tion, Start-Up, and Configuration manual for con- figuration procedures.
3V Control System VVT Zone Controller
Bypass Controller