Outdoor Air Quality Sensor; Space Relative Humidity Sensor; Smoke Detector/Fire Shutdown (Fsd); Connecting Discrete Inputs - Carrier 50TCQD14 Installation Instructions Manual

To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 56. Connect the 4- - 20 mA terminal to the
RTU Open controller at J4- - 2 and connect the SIG COM
terminal to the RTU Open controller at J4- - 3. See Fig. 70.
IAQ Sensor
SEN
COM
24 VAC
Fig. 70 - - RTU Open Controller / Indoor CO
(33ZCSENCO2) Connections

Outdoor Air Quality Sensor

(P/N 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. 58. 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. 56. Connect the 4 to 20 mA
terminal to the RTU Open controller at J4- - 5. Connect the
SIG COM terminal to the RTU Open controller at J4- - 6.
OAQ Sensor
COM
24 VAC
Fig. 71 - - RTU Open Controller / Outdoor CO
(33ZCSENCO2) Connections

Space Relative Humidity Sensor—

The Space Relative Humidity Sensor is not used with
50TCQ units at this time.
Smoke Detector/Fire Shutdown (FSD) —
On 50TCQ 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. 66 (RTU
Open controller system wiring diagram).
J4-2
J4-3
Sensor
2
sensor must be located in the
2
Sensor: A dedicated
2
SEN
Sensor
2
The Fire
MENU Config

normally open status of this input when there is no fire
alarm.
Connecting Discrete Inputs —
Filter Status: The filter status accessory is a
field- - installed
plugged filters. When installing this accessory, the unit
must be configured for filter status by setting
MENU Config

Filter Status and normally open (N/O) or normally
closed (N/C). Input 8 or 9 is recommended for ease of
C08462
installation. Refer to Fig. 65 and 66 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
MENU Config

Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for ease of installation. Refer
to Fig. 65 and 66 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
MENU Config

Remote Occupancy and normally open (N/O) or normally
closed (N/C).
Also set MENU
on/off. Input 8 or 9 is recommended for ease of installation.
Refer to Fig. 65 and Table 27 for wire terminations at J5.
Power Exhaust (output): The relay used by the RTU
Open controller board to control power exhaust is a dry
contact which means it does not have 24 vac. This 24 vac
must be connected to the relay to allow it to operate the
J4-5
power exhaust relay in the PE accessory. A 24 vac source
must be provided to J11- - 2 on the RTU Open controller
board. This can be provided by the unit's transformer from
J4-6
various sources. The "R" terminal on the unit's central
terminal board (CTB) is a logical source. Refer to Fig. 65
and 66 for wire terminations at J11.
C11086

Communication Wiring - - Protocols

General —
Protocols are the communication languages spoken by
control devices. The main purpose of a protocol is to
communicate information in the most efficient method
possible. Different protocols exist to provide different
kinds of information for different applications. In the BAS
application, many different protocols are used, depending
on manufacturer. Protocols do not change the function of
a controller; just make the front end user different.
54
Shutdown Switch
Inputs input 5, identifies the
 
accessory. This accessory
Inputs input 3, 5, 8, or 9 to
 
for fan status
Inputs input 3, 5, 8, or 9 to Fan
 
for remote occupancy
Inputs input 3, 5, 8, or 9 to
 
Schedules occupancy source to DI
 
configuration,
detects
by setting
by setting