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COVER REMOVED
Fig. 46 − Outdoor Air Quality Sensor Cover
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. 44. 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.
See Fig. 47.
OAQ Sensor/RH Sensor
SEN
COM
24 VAC
Fig. 47 − RTU Open Controller / Outdoor CO
(33ZCSPTCO2−01 or 33ZCSPTCO2LCD−01)
Connections
SIDE VIEW
C07135
Sensor: A dedicated
2
J4-5
J4-6
C08463
Sensor
2
Space Humidity Sensor or Humidistat —
Perfect Humidityt System Control Wiring: In units
equipped with the Perfect Humidity system option there
are two loose wires loose in the control box (one PNK and
one PNK/BLK) used to control the dehumidification
function of the unit. These wires are meant to be tied to a
space humidistat or thermidistat on an electromechanical
unit. On RTU Open controller equipped units these wires
must be connected to J11−7 & 8 to allow the Open board
to operate the dehumidification function for the unit.
Disconnect the J11 Phoenix style connector from the
board and use the plug screws to secure the wires as
follows: secure the PNK/BLK wires at pin 7 and the PNK
wires at pin 8, and then reconnect the plug to the board at
J11.
Relative Humidity Sensors (Space or Duct Mounted):
The accessory space humidity sensor (33ZCSENSRH-01)
or duct humidity sensor (33ZCSENDRH-01) is used to
measure the relative humidity of air within the space or
return air duct. The RH reading is used to control the
Perfect Humidity system option of the rooftop unit. For
wiring distances up to 500 ft (152 m), use a 3−conductor,
18 or 20 AWG shielded cable. The shield must be
removed from the sensor end of the cable and grounded at
the unit end. The current loop power for sensor is
provided by the RTU Open controller as 24vdc. Refer to
the instructions supplied with the RH sensor for the
electrical requirements and terminal locations. RTU Open
controller configurations must be changed after adding an
RH sensor. See Fig. 48 and 49 for typical RH sensor
wiring.
S J4−1 or J4−4 = 24vdc loop power
S J4−2 or J4−5 = 4−20mA signal input
NOTE: The factory default for dehumidification control
is normally open humidistat.
MOUNTING
HOLES
Io
Vin
Gnd
Vin - J4-1 or J4-4 24Vdc
Io
- J4-2 or J4-5 -20mA output
Fig. 48 − Space Relative Humidity Sensor Typical Wiring
30
WIRING
OPENING
Vo
SW2
C11087
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