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RTU Open 19
NOTE For rooftop unit installation, see the base unit installation instructions.
Failure to follow this warning could cause personal injury, death, and/or equipment damage.
ELECTRICAL SHOCK HAZARD
Disconnect all power to the unit before performing maintenance or service. Unit may automatically start if
power is not disconnected.
Field-supplied sensor hardware
The RTU Open controller is configurable with the following field-supplied sensors:
Sensor
Part numbers
Notes
Space temperature sensor
(page 20)
SPS, SPPL, SPP, 33ZCT55SPT,
33ZCT56SPT, 33ZCT59SPT
Supply air temperature sensor
(page 21)
33ZCSENSAT Factory-installed
Duct air temperature sensor
(page 22)
33ZCSENDAT
Outdoor air temperature sensor
(page 23)
33ZCSENOAT Factory-supplied with Economizer
CO2 sensor (page 24) 33ZCSENCO2, 33ZCT55CO2,
33ZCT56CO2
Required only for demand control
ventilation - a dedicated 24-vac
transformer is required
Outdoor air quality sensor (page
25)
33ZCTSENCO2 Optional with demand control
ventilation
Duct relative humidity sensor
(page 26)
33ZCSENDRH-01
Space relative humidity sensor
(page 26)
33ZCSENSRH-01
Humidistat (page 27) TSTATCCPLH01-B
CO2 aspirator box (page 24) C33ZCCASPCO2 Required for CO2 return duct/outside
air applications
Outdoor air enthalpy switch
(page 28)
33CSENTHSW
Return air enthalpy sensor
(page 28)
33CSENTSEN Optional with
33CSSENTHSW
Filter status switch (page 31) 33CSFS-01
Fan status switch (page 31) 33CSAS-01 or field-supplied
For specific details about sensors, see the Carrier Sensors Installation Guide.