Carrier 48TC Instruction Manual download pdf (Page 27)

Space Relative Humidity Sensor or Humidistat

Connections —

NOTE: The accessory space relative humidity sensor and

humidistat are not available for single phase (--3 voltage

code) models.

Space Relative Humidity Sensor connections: The

accessory space relative humidity sensor (33ZCSENSRH-01)

is installed on an interior wall to measure the relative

humidity of the air within the occupied space.

The use of a standard 2 X 4 inch electrical box to

accommodate the wiring is recommended for installation.

The sensor can be mounted directly on the wall, if

acceptable by local codes.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in

permanent damage to the sensor.

DO NOT clean or touch the sensing element with

chemical solvents as they can permanently damage

the sensor.

CAUTION

UNIT PERFORMANCE HAZARD

Failure to follow this caution will result in inaccurate

sensor readings.

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 dimmers. Sensors mounted

in those areas will produce inaccurate readings.

CAUTION

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

humidity sensor using 2 screws and 2 hollow wall anchors

(field supplied). Do not over tighten screws. See Fig. 48.

SW2

12345 6

Vin

Gnd

MOUNTING

HOLES

WIRING

OPENING

C11084

Fig. 48 -- Space Relative Humidity Sensor Installation

The sensor must be mounted vertically on the wall. The

Carrier logo should be orientated correctly when the

sensor is properly mounted.

Avoid corner locations. Allow at least 4 ft between the

sensor and any corner. Airflow near corners tends to be

reduced, resulting in erratic sensor readings. The sensor

should be vertically 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. ACCN communication cable can be

used, although the shield is not required. The shield must

be removed from the sensor end of the cable if this cable

is used. See Fig. 49 for wiring details.

Io VoVin Gnd

BLACK

RED

TB1-7

TB1-13

C11180

Fig. 49 -- Space Relative Humidity Sensor Connection

The power for the sensor is provided by the PremierLink

control on terminal J5--4 (+33 to +35vdc).

To wire the sensor:

1. At the sensor, remove 4 inches fo the jacket from the

cable. Strip ¼ inch of insulation from each conductor.

Route the cable through the wire clearance opening in

the center of the sensor. See Fig. 48.

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

to TB1--13.

5. Connect the field--supplied BLACK wire from the

sensor to TB1--7.

Smoke Detector/Fire Shutdown (FSD) —

This function is available only when PremierLink is

configured for (Space) Sensor Mode. The unit is

factory--wired for PremierLink FSD operation when

PremierLink is factory--installed.

On 48TC units equipped with factory--installed Smoke

Detector(s), the smoke detector controller implements the

unit shutdown through its NC contact set connected to the

unit’s CTB input. The FSD function is initiated via the

smoke detector’s Alarm NO contact set. The PremierLink

communicates the smoke detector’s tripped status to the

CCN building control. See Figs. 36 and 37, PremierLink

wiring schematics.

48TC

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Carrier 48TC Instruction Manual Page 27

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