Carrier 50TCA04-A07 - Manual (Page 30)

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SEN J5-5
J5-6 COM
9
7
TB1
TB1
IAQ Sensor
PL
24 VAC
C08274
Fig. 44 -- Indoor CO2 Sensor (33ZCSENCO2) Connec-
tions
Refer to Form 33CS--58SI, PremierLink Installation,
Start--up, and Configuration Instructions, for detailed
configuration information
Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus
weatherproof enclosure) — The outdoor air CO2 sensor is
designed to monitor carbon dioxide (CO2) levels in the
outside ventilation air and interface with the ventilation
damper in an HVAC system. The OAQ sensor is packaged
with an outdoor cover. See Fig. 45. The outdoor air CO2
sensor must be located in the economizer outside air hood.
COVER REMOVED SIDE VIEW
C07135
Fig. 45 -- Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO2 Sensor — A dedicated
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. 43. Connect the 4 to 20 mA
terminal to 50TC’s terminal TB1--11. Connect the SIG
COM terminal to 50TC’s terminal TB1--13. See Fig. 461.
SEN J5-2
J5-3 COM
13
11
TB1
TB1 PL
OAQ Sensor/RH Sensor
24 VAC
C08275
Fig. 46 -- Outdoor CO2 Sensor Connections
Refer to Form 33CS--58SI, PremierLink Installation,
Start--up, and Configuration Instructions, for detailed
configuration information.
Smoke Detector/Fire Shutdown (FSD) — This function is
available only when PremierLink is configured for
(Space) Sensor Mode. The unit is factory--wired for
PremierLink FSD operation when PremierLink is
factory--installed.
On 50TC 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 LCTB input. The FSD function is initiated via the
smoke detector’s Alarm NO contact set. The PremierLink
communicates the smoke detector’s tripped status to the
CCN building control. See Fig. 23 for unit smoke detector
wiring.
Alarm state is reset when the smoke detector alarm
condition is cleared and reset at the smoke detector in the
unit.
If the PremierLink mode has been changed to Thermostat,
disconnect the BLU lead (from LCTB DDC--1) at TB1--6
(Y2) and tape off before connecting the thermostat to
TB1.
Filter Status Switch — This function is available only
when PremierLink is configured for (Space) Sensor Mode.
PremierLink control can monitor return filter status in two
ways: By monitoring a field--supplied/installed filter
pressure switch or via supply fan runtime hours.
Using switch input: Install the dirty filter pressure switch
according to switch manufacturer’s instructions, to
measure pressure drop across the unit’s return filters.
Connect one side of the switch’s NO contact set to
LCTB’s THERMOSTAT--R terminal. Connect the other
side of the NO contact set to TB1--10. Setpoint for Dirty
Filter is set at the switch. See Fig. 47.
R
10
TB1
LCTB
Thermostat
J4-4
PL
Filter Switch (NO, close on rising pressure (high drop))
C08216
Fig. 47 -- PremierLink Filter Switch Connection
When the filter switch’s NO contact set closes as filter
pressure drop increases (indicating dirt--laden filters), the
input signal to PremierLink causes the filter status point to
read “DIRTY”.
Using Filter Timer Hours: Refer to Form 33CS--58SI for
instructions on using the PremierLink Configuration
screens and on unit alarm sequence.
Supply Fan Status Switch — The PremierLink control can
monitor supply fan operation through a
field--supplied/installed differential pressure switch. This
50TC