Carrier 33ZCVAVTRM Specifications download pdf (Page 6)

This book will discuss installation and wiring of the bypass

controller and bypass actuator. The bypass damper and duct

system should already be correctly sized and installed. The by-

pass actuator should be sized to match the bypass damper.

Carrier provides system software that can be used to design the

system and choose the correct dampers and actuators based on

the application.

Bypass Controller Hardware — The bypass control-

ler consists of the following hardware:

• control module

• plastic enclosure with integrated actuator

• one no. 8 x

-in. self-drilling sheet metal screw

Figure 1 shows the bypass controller physical details.

Field-Supplied Hardware — Each bypass controller

requires the following field-supplied components to complete

its installation:

•damper

• damper actuator (if high-torque actuator is required)

• transformer — 24 vac, 40 va (standard applications)

• duct temperature sensor (33ZCSENDAT) with grommet

(to secure DAT sensor to duct)

DUCT TEMPERATURE SENSOR (DAT) — The bypass

controller must be connected to a field-supplied duct tempera-

ture sensor (part number 33ZCSENDAT) to monitor the tem-

perature of the air delivered by the air source.

Mount Bypass Controller

LOCATION — The bypass controller should be located on or

near the bypass damper in a ceiling area where accessible.

When an external high-torque actuator is used, the bypass

controller is mounted on the shaft of the damper. Select a

location which will be safe from water damage and allow

sufficient access for service and wiring. For service access,

there should be at least 6 in. of clearance between the front of

the bypass controller and adjacent surfaces. Refer to Fig. 1-3.

MOUNTING — Perform the following steps to mount the

bypass 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

clampinthesamedirectionthatwasrequiredtoclose

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 bypass 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 grom-

metisinthecenteroftheslot.FAILURETO

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. Replace wiring access cover.

Connect the Power Transformer — An individual,

field-supplied, 24-vac power transformer is required for each

bypass controller. Transformers must be UL (Underwriters’

Laboratories) Class 2 rated. Standard applications require a

24 vac transformer, rated at 40 va minimum. All transformer

secondaries are required to be grounded. Use only stranded

copper conductors for all wiring to the bypass controller.

Wiring connections must be made in accordance with NEC

(National Electrical Code) and local codes. Ground one side of

the transformer secondary at the transformer location. Connect

the grounded side of the transformer to J1-2. Connect the live

side of the transformer secondary to J1-1. Connect an 18-gage,

green ground wire from terminal J1-3 to the metal chassis of

the unit.

The power supply is 24 vac ± 10% at 40 va (50/60 Hz).

For bypass controllers, the power requirement sizing allows

for the bypass actuator. The bypass damper actuator is limited

to 20 va.

NOTE: Do not run sensor or communication wiring in the

same conduit with line-voltage wiring.

Perform the following steps to connect the power

transformer:

1. Install the field-supplied transformer in an electrical

enclosure that conforms to NEC and local codes.

2. Connect 24 vac from the transformer as shown in the

applicable wiring diagram (Fig. 4). Be sure to observe

polarity when connecting the transformer power. The

grounded terminal must be connected to the transformer

ground terminal as shown.

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Carrier 33ZCVAVTRM Specifications Page 6

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