Carrier 40UV - Page 35

35
Air Quality Sensor Wiring
— To wire the sensor after it has
been mounted in the conditioned space, see Fig. 22 and the
installation instructions shipped with the sensor. For each
sensor, use 2-conductor 18 AWG 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 board, identify the
positive (+) and negative (–) output terminals to the sensor
terminal block and connect the positive terminal to terminal
T13. Connect the negative terminal to terminal T14 on the
control board. Mount a field-supplied Class II, 24 vac trans-
former with a 40 va rating in a suitable location inside the unit’s
control box. Wire the transformer primary to line voltage
power after any fuses and disconnect switches. Ensure the
transformer primary voltage rating matches the unit’s voltage
rating. Refer to the wire label diagram shipped with the unit.
Connect one of the transformer secondary leads to the 24 vac
power terminal of the sensor. Connect the remaining secondary
lead to the ground terminal sensor.
J1
POWER
J4
SERVICE CONNECTOR
J3
CCN
321
321
T26
T28
T30
T29
24Vdc
COOLING
OUTPUT
T31
T32
HEATING
OUTPUT
T33
T34
MIXED AIR
DAMPER
OUTPUT
T37
T38
T39
COOLING
ENABLE
NO
NC COM NO
NC
COM
K2
MED/LO
FAN SPEED
K3
HI/MED
FAN SPEED
K1
FAN ON/OFF
NO NC
COM
CHANGE OVER
SPARE
T25
T24
T23
T22
COMMON
GND
OA ENTH
DISCRETE
SWITCH
INPUTS
T17
T18
T20
T19
T21
RH
AQ
T9
T10
T11
T12
T13
T14
T15
T16
MAT
OAT
T8
T7
T6
T5
T4
T3
T1
T2
SAT
SPT/RAT
ANALOG
SENSOR
INPUTS
FIELD SUPPLIED
ISOLATED 24VAC
POWER SOURCE
AQ
+
-
SPT ADJ
FAN STATUS
FIRE SMOKE
T35
T36
REMOTE
S/S
LOW LIMIT
HEATING
ENABLE
LEGEND
ADJ — Adjust
AQ — Air Quality
CCN — Carrier Comfort Network®
COM — Common
GND — Ground
MAT — Mixed-Air Temperature Sensor
OA ENTH — Outdoor-Air Enthalpy
OAT — Outdoor-Air Temperature Sensor
NC — Normally Closed
NO — Normally Open
RAT — Return-Air Temperature Sensor
S/S — Start/Stop
SAT — Supply-Air Temperature Sensor
SPT — Space Temperature Sensor
RH — Relative Humidity
Fig. 22 — Air Quality Sensor Wiring