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 ComfortLink™ 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 ComfortLink™
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 ComfortLink™ 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 ComfortLink 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
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
(36 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals