Carrier 33ZCVAVTRM Specifications download pdf (Page 138)

HUMIDITY SENSOR (WALL-MOUNTED) INSTALLA-

TION — The accessory space humidity sensor is installed on

an interior wall to measure the relative humidity of the air with-

in the occupied space.

The use of a standard 2 x 4-in. electrical box to accommo-

date the wiring is recommended for installation. The sensor can

be mounted directly on the wall, if acceptable by local codes.

If the sensor is installed directly on a wall surface, install the

humidity sensor using 2 screws and 2 hollow wall anchors

(field-supplied). Do not over tighten screws. See Fig. 14.

The sensor must be mounted vertically on the wall. The

Carrier logo should be oriented correctly when the sensor is

properly mounted.

Avoid corner locations. Allow at least 4 ft between the sen-

sor and any corner. Airflow near corners tends to be reduced,

resulting in erratic sensor readings. The sensor should be verti-

cally mounted approximately 5 ft up from the floor, beside the

space temperature sensor.

For wiring distances up to 500 feet, use a 3-conductor, 18 or

20 AWG cable. A CCN communication cable can be used, al-

though the shield is not required. The shield must be removed

from the sensor end of the cable if this cable is used. See

Fig. 15 for wiring details.

The power for the sensor is provided by the PremierLink

control on terminal J5-4 (+33 to +35vdc). To wire the sensor

perform the following:

1. At the sensor, remove 4-in. of jacket from the cable. Strip

-in. of insulation from each conductor. Route the cable

through the wire clearance opening in the center of the

sensor. See Fig. 14.

2. Connect a field-supplied BLACK wire to the sensor

screw terminal marked Vin.

3. Connect a field-supplied RED wire into the sensor screw

terminal marked Io.

4. At the PremierLink controller, route the cable away from

high voltage wiring and disconnect the power to prevent

accidental shorting or grounding of wires when connect-

ing the sensor. Remove the J5 Molex female plug and lo-

cate the BROWN wire on pin 3. Using a small, flat blade

screwdriver gently press down in the slot on the side of

the plug while pulling on the BROWN wire to remove it

from slot. Re-insert the BROWN wire in the pin 4 slot

making sure it is securely seated. There should now be an

empty slot between the BLUE and BROWN wires. See

Fig. 15.

5. Connect the field-supplied RED wire from the sensor to

the BLUE wire on J5-4.

6. Connect the field-supplied BLACK wire from the sensor

to the BROWN wire on J5-2.

Do NOT clean or touch the sensing element with chem-

ical solvents as they can permanently damage the sensor.

DO NOT mount the sensor in drafty areas such as near

heating or air-conditioning ducts, open windows, fans, or

over heat sources such as baseboard heaters, radiators, or

wall-mounted light dimmers. Sensors mounted in those ar-

eas will produce inaccurate readings.

24 VAC

24 VDC

ALARM

RELAY

CONTACTS

COM

}

0-10VDC

SIG COM (J5-3)

4-20mA (J5-2)

Fig. 12 — Outdoor Air Quality (CO

) Sensor

(33ZCSENCO2) — Typical Wiring Diagram

COVER REMOVED SIDE VIEW

Fig. 13 — Outdoor Air Quality Sensor Cover

SW2

12345 6

Vin

Gnd

MOUNTING

HOLES

WIRING

OPENING

Fig. 14 — Humidity Sensor Installation

a33-9141

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Carrier 33ZCVAVTRM Specifications Page 138

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