Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 533-358 Printed in U.S.A. Form 33ZC-3SI Pg 1 10-99 Replaces: New
Book 1 4
Tab 11a 13a
Mounting Instructions
Part Numbers 33ZCVAVTRM, 33ZCFANTRM, 33ZCSECTRM
GENERAL
The VAV Fan Terminal Zone Controller (33ZCFANTRM)
provides dedicated control functions for series fan or parallel
fan powered terminals, single duct terminals with 3 stages of
heat, or as a primary controller for dual duct or zone pressure
control applications. The VAV Fan Terminal zone controller is
part of the Carrier ComfortID System.
The Single Duct Air Terminal Zone Controller
(33ZCVAVTRM) provides dedicated control functions for sin-
gle duct terminals with modulating heat or up to 2 stages of
heat. The single duct air terminal zone controller is part of the
Carrier ComfortID system.
With the addition of a secondary terminal and the
33ZCSECTRM secondary terminal zone controller accessory,
either dual duct or zone pressurization applications can be sup-
ported. This accessory is only used with the 33ZCFANTRM
controller.
TOOLS REQUIRED
•1/4-in. nut driver
• 8-mm wrench or socket
• No. 1 Phillips head screwdriver
INSTALLATION
Location — The zone controller must be mounted on the
air terminal’s damper actuator shaft. For service access, there
should be at least 12 in. of clearance between the front of the
zone controller and adjacent surfaces.
Mounting — Perform the following steps to mount the
zone 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 control to the terminal by sliding the
damper shaft through the actuator clamp assembly.
Secure the control by installing the screw provided
through the grommet in the anti-rotation tab. Be sure
the floating grommet is in the center of the slot. FAIL-
URE TO CENTER THE GROMMET 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. Remove the cover from the zone controller. Install
two lengths of field-supplied 1/4-in. pneumatic tubing
(rated for the application) from the pressure transducer
to the velocity pressure pick-up tubes. 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. Connect high side
to the P1 port of the airflow transducer. Replace cover.
IMPORTANT: This document contains zone con-
troller mounting information only. Refer to the
Installation, Start-Up, and Configuration manual for
zone controller wiring and tubing installation. Refer
to the Installation, Start-Up, and Configuration
manual for configuration procedures.
Single Duct Air Terminal Zone Controller
VAV Fan Terminal Zone Controller
Secondary Terminal Zone Controller
