Outdoor Air Quality Sensor; Connecting Discrete Inputs - Carrier 50HCQ12 Installation Instructions Manual

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. 41. 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. 43. 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. 41. Connect the 4 to 20 mA
terminal to RTU Open J4- - 5. Connect the SIG COM
terminal to RTU Open J4- - 6.
OAQ Sensor/RH 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
C08463
Sensor
2
On 50HCQ 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, the RTU
Open System Control Wiring Diagram.
The Fire Shutdown
MENU Config Inputs
→ → →
normally 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. 50 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
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. 50 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. 50 and Table 8 for wire
terminations at J5.
Power Exhaust (output): Connect the accessory Power
Exhaust contactor coil(s) per Fig. 58.
Power Exhaust
PEC
GRA
TAN
Fig. 58 - - RTU Open Power Exhaust Connections
Space Relative Humidity Sensor: The RH sensor is not
used with 50HCQ models at this time.
31
Switch configuration,
input 5,
identifies
status accessory is
status by setting
input 3, 5, 8, or 9 to Filter
fan status by setting
input 3, 5, 8, or 9 to Fan
occupancy by setting
input 3, 5, 8, or 9 to Remote
occupancy source to DI
→
J11-3
CTB
THERMOSTAT
C
C10362
the
a