Carrier WeatherMaster 48HC14 Installation Instructions Manual page 51

lation damper in an HVAC system. The OAQ sensor is pack-
aged with an outdoor cover. See Fig. 72. The outdoor air CO
sensor must be located in the economizer outside air hood.
COVER REMOVED
Fig. 72 — Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO
supply is required for this sensor. A two-wire cable is required
to wire the dedicated power supply for the sensor. The two
wires should be connected to the power supply and terminals 1
and 2.
To connect the sensor to the control, identify the positive (4
to 20 mA) and ground (SIG COM) terminals on the OAQ sen-
sor. See Fig. 70. Connect the 4 to 20 mA terminal to the TB3-
13 terminal of the 48HC**14. Connect the SIG COM terminal
to the TB3-11 terminal of the 48HC**14. See Fig. 73.
OAQ SENSOR/RH SENSOR
SEN
COM
24 VAC
Fig. 73 — Outdoor CO
SPACE RELATIVE HUMIDITY SENSOR OR HUMIDI-
STAT CONNECTIONS
Space Relative Humidity Sensor connections
sory space relative humidity sensor (33ZCSENSRH-01) is in-
stalled 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 accommo-
date the wiring is recommended for installation. The sensor can
be mounted directly on the wall, if acceptable by local codes.
SIDE VIEW
Sensor A dedicated power
—
2
TB3
13 J5-2
TB3
J5-3
11
Sensor Connections
2
The acces-
—
2
UNIT DAMAGE HAZARD
Failure to follow this caution may result in permanent dam-
age to the sensor.
DO NOT clean or touch the sensing element with chemical
solvents as they can permanently damage the sensor.
IMPORTANT: 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.
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. 74.
MOUNTING
HOLES
PL
Fig. 74 — Space Relative Humidity Sensor
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 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. 75 for wiring details.
51
CAUTION
Io Vin Gnd
Vo
SW2
Installation
WIRING
OPENING