Outdoor Air Quality Sensor; Smoke Detector/Fire Shutdown (Fsd); Connecting Discrete Inputs - Carrier 50KCQ Installation Instructions Manual

Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources.
Allow at least 3 ft (0.9 m) between the sensor and any
corner. Avoid mounting the sensor where it is influenced
by the supply air; the sensor gives inaccurate readings if
the supply air is blown directly onto the sensor or if the
supply air does not have a chance to mix with the room air
before it is drawn into the return airstream.
Wiring the Indoor Air Quality Sensor: For each sensor,
use two 2- - conductor 18 AWG (American Wire Gage)
twisted- - pair cables (unshielded) to connect the separate
isolated 24 vac power source to the sensor and to connect
the sensor to the control board terminals.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 42. Connect the 4- - 20 mA terminal to
RTU Open J4- - 2 and connect the SIG COM terminal to
RTU Open J4- - 3. See Fig. 56.
IAQ Sensor
SEN
COM
24 VAC
Fig. 56 - - RTU Open / Indoor CO
(33ZCSENCO2) Connections

Outdoor Air Quality Sensor

(PNO 33ZCSENCO2 plus weatherproof enclosure) —
The outdoor air CO sensor is designed to monitor carbon
2
dioxide (CO ) levels in the outside ventilation air and
2
interface with the ventilation damper in an HVAC system.
The OAQ sensor is packaged with an outdoor cover. See
Fig. 44. The outdoor air CO
economizer outside air hood.
Wiring the Outdoor Air CO
power 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 sensor. See Fig. 42. Connect the 4 to 20 mA
terminal to RTU Open J4- - 5. Connect the SIG COM
terminal to RTU Open J4- - 6.
OAQ Sensor
SEN
COM
24 VAC
Fig. 57 - - RTU Open / Outdoor CO
(33ZCSENCO2) Connections
J4-2
J4-3
C08462
Sensor
2
sensor must be located in the
2
Sensor: A dedicated
2
J4-5
J4-6
C11086
Sensor
2
Space Relative Humidity Sensor—
The Space Relative Humidity Sensor is not used with
50KCQ units at this time.
Smoke Detector/Fire Shutdown (FSD) —
On 50KCQ 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 RTU Open
controller communicates the smoke detector's tripped
status to the BAS building control. See Fig. 52 (RTU
Open System Control wiring schematics).
The Fire Shutdown
  
MENU Config Inputs
open status of this input when there is no fire alarm.
Connecting Discrete Inputs —
Filter Status: The filter
field- - installed accessory. This accessory detects plugged
filters. When installing this accessory, the unit must be
configured for filter
  
MENU Config Inputs
Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 51 and Fig. 52 for wire terminations at J5.
Fan Status: The fan status accessory is a field- - installed
accessory. This accessory detects when the indoor fan is
blowing air. When installing this accessory, the unit must be
configured for fan
  
MENU Config Inputs
and normally open (N/O) or normally closed (N/C). Input 8
or 9 is recommended for easy of installation. Refer to Fig.
51 and Fig. 52 for wire terminations at J5.
Remote Occupancy: The remote occupancy accessory is
a field- - installed accessory. This accessory overrides the
unoccupied mode and puts the unit in occupied mode.
When installing this accessory, the unit must be
configured for remote
  
MENU Config Inputs
Occupancy and normally open (N/O) or normally closed
(N/C).

Also set MENU Schedules
on/off. Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 51 and Table 8 for wire
terminations at J5.
Power Exhaust (output): The relay used by the RTU
Open board to control power exhaust is a dry contact
which means it does not have 24vac. This 24vac must be
connected to the relay to allow it to operate the power
exhaust relay in the PE accessory. A 24vac source must be
provided to J11- - 2 on the RTU Open control board. This
can be provided by the unit's transformer from various
sources. The "R" terminal on the unit's low voltage
terminal board (LVTB) is a logical source. Refer to Fig.
51 and Fig. 52 for wire terminations at J11.
32
Switch configuration,
input 5, identifies the normally
status accessory is
status by setting
input 3, 5, 8, or 9 to Filter
status by setting
input 3, 5, 8, or 9 to Fan Status
occupancy by setting
input 3, 5, 8, or 9 to Remote

occupancy source to DI
a