Carrier 48/50Z030-105- User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53480065-01

Printed in U.S.A.

Form 48/50-74SI

Pg 1

8-09

Replaces: 48/50-67SI

Installation Instructions

Part Number CRHUMDSN001B00

The accessory humidity sensor can be used with all

48/50A020-060, 48/50P030-100, and 48/50Z030-105 units

with

Comfort

Link™ controls.

PACKAGE CONTENTS

*Wiring harness is not used.

GENERAL

The humidity sensor (see Fig. 1) measures the amount of

moisture in the air. It is used in conjunction with a temperature

sensor to determine the enthalpy content of the air. The humid-

ity sensor sends a 4 to 20 mA signal to the

Comfort

Link™

controller.

On all units, the outdoor air temperature sensor and the re-

turn air temperature sensor are standard. For single enthalpy

control, an accessory humidity sensor (part no.

CRHUMDSN001B00) is required. Two accessory humidity

sensors (part no. CRHUMDSN001B00) are required for differ-

ential enthalpy control.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. Only trained and qualified service personnel should

install, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenance

functions of replacing filters. All other operations should be

performed by trained service personnel. When working on air-

conditioning equipment, observe precautions in the literature,

tags and labels attached to the unit, and other safety precautions

that may apply.

INSTALLATION

48/50A Series Units

OUTDOOR AIR HUMIDITY SENSOR

1. Remove the wiring harness that is connected to the

humidity sensor.

NOTE: The 42-in. wiring harness is not used.

2. Install the outdoor air humidity sensor on the economizer

using the screws provided (see Fig. 2). Attachment holes

are pre-punched.

3. Electrical connections are made to an existing harness

that is factory-routed to the sensor mounting location.

Connect outdoor air humidity sensor to the harness plug

labeled OARH. The harness is factory-wired to the econ-

omizer control board (ECB1), terminals J5-4 (BLU) and

J5-5 (ORN).

4. Configure the

Comfort

Link™ controls for use with the

humidity sensor. Refer to the unit Controls and Trouble-

shooting literature for more information.

RETURN AIR HUMIDITY SENSOR

1. Remove the wiring harness that is connected to the

humidity sensor.

NOTE: The 42-in. wiring harness is not used.

2. Install the return air humidity sensor on the economizer

using the screws provided (see Fig. 2). Attachment holes

are pre-punched.

3. Electrical connections are made to an existing harness

that is factory-routed to the sensor mounting location.

Connect return air humidity sensor to the harness plug

labeled RARH. The harness is factory-wired to the econ-

omizer control board (ECB1), terminals J5-1 (BLU) and

J5-2 (ORN).

4. Configure the

Comfort

Link controls for use with the

humidity sensor. Refer to the unit Controls and Trouble-

shooting literature for more information.

ITEM QUANTITY

Humidity Sensor

1

6-20,

3

/

4

-in. long Sheet Metal Screw

2

Wiring Harness, 42-in., 2 Pin*

1

Fig. 1 — Humidity Sensor

IMPORTANT: For horizontal applications, it is easiest to

install the humidity sensor prior to making duct connections.

WARNING

Prior to installation of this accessory, make sure all power

is disconnected to the unit and locked out. Failure to dis-

connect power supply prior to servicing may result in seri-

ous injury.

CAUTION

When removing panels from the unit, be careful not to

damage the roof or other surfaces with the panels.

48/50A020-060,48/50P030-100,

48/50Z030-105

Humidity Sensor

for Enthalpy Control Accessory