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Table 1 – RTU--OPEN Inputs and Outputs
POINT NAME
BACnet OBJECT
NAME
TYPE OF I/O
CONNECTION PIN
NUMBER(S)
DEDICATED INPUTS
Space Temp / Zone Temp zone_temp AI (10K Thermistor) J 2 0 --- 1 , 2
Supply Air Temperature sa_temp AI (10K Thermistor) J 2 --- 1 , 2
Outdoor Air Temperature oa_temp AI (10K Thermist or) J 2 --- 3 , 4
Space Temperature Offset Pot stpt_adj_offset AI (100K Potentiometer) J 2 0 --- 3
Safety Chain Feedback safety_status DI (24 VAC) J 1 --- 9
Compressor Safety Status comp_status DI (24 VAC) J 1 --- 2
Fire Shutdown Status firedown_status DI (24 VAC) J 1 --- 1 0
Enthalpy Status enthalpy_status DI (24 VAC) J 2 --- 6
Humidistat Input Status humstat_status DI (24 VAC) J 5 --- 7
CONFIGURABLE INPUTS
Indoor Air CO2 iaq A I ( 4 --- 2 0 m a )
J 4 --- 2 o r J 4 --- 5
Outdoor Air CO2 oaq A I ( 4 --- 2 0 m a )
Space Relative Humidity space_rh A I ( 4 --- 2 0 m a )
Supply Fan Status* sfan_status DI (24 VAC)
J 5 --- 1 o r J 5 --- 3 o r
J55orJ5---7
Filter Status* filter_status DI (24 VAC)
Door Contact Input* door_contact_status DI (24 VAC)
Occupancy Contact* occ_contact_status DI (24 VAC)
OUTPUTS
Economizer Output econ_output A O ( 4 --- 2 0 m a ) J 2 --- 5
SupplyFanRelayState sfan DO Relay (24V AC , 1A) J 1 --- 4
Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J 1 --- 8
Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J 1 --- 7
Heat Stage 1 Relay State heat_1 DO Relay (24V AC , 1A) J 1 --- 6
Heat Stage 2 Relay State heat_2 DO Relay (24V AC , 1A) J 1 --- 5
Power Exhaust Relay State pexh DO Relay (24V AC , 1A) J 1 1 --- 3
Dehumidification Relay State dehum DO Relay (24VAC, 1A) J 1 1 --- 7 , 8
* These inputs (if installed) take the place of the default input on the specific channel
Pa r a l l e l p i n s J 5 --- 1 = J 2 --- 6 , J 5 --- 3 = J 1 --- 1 0 , J 5 --- 5 = J 1 --- 2 a r e u s e d fo r f il e d in s t a l l a t i o n .
Refer to the input configuration and accessory sections for more detail.
Sensors and Accessories
The RTU-OPEN controller is configurable with the
following field-supplied sensors:
NOTE: Supply air temperature sensor (33ZCSENSAT) is
factory-installed.
S Space temperature sensor (SPS, SPPL, SPP, SPPF,
33ZCT55SPT, 33ZCT56SPT, or 33ZCT59SPT
S Indoor air quality sensor (33ZCSENCO2,
33ZCT55CO2, 33ZCT56CO2) required for demand
control ventilation.
S Outdoor air quality sensor (33ZCTSENCO2)
S CO
2
aspirator box (C33ZCCASPCO2) required for CO
2
return duct/outside air applications
S Outdoor air enthalpy switch (33CSENTHSW)
S Return air enthalpy sensor (33CSENTSEN) required for
differential enthalpy control
S Space relative humidity sensor (33ZCSENSRH-01)
S Duct relative humidity (33ZCSENDRH-01)
S Humidistat (--HL--38MG-029)
S Smoke Detectors (CRSMKSEN002A00,
CRSMKKIT002A00)
S Fan and/or Filter Status (CRSTATUS001A00,
CRSTATUS005A00)
User Interfaces
S BACview 6 Handheld (BV6H)
S Virtual BACview (USB-L or USB-TKIT required)
S Field Assistant (USB-TKIT required)
Install Analog Sensors
Supply Air Sensor (SAT)
The factory supplies the discharge (supply) air sensor with
the unit and is pre--wired. On 04-16 size units, the SAT is
secured to the unit’s supply duct opening. This sensor
must be relocated into the supply duct during unit
installation. On 17-30 size units, the SAT is mounted
through the side of the heat chamber below the fan deck,
and does NOT require relocation.
OutdoorAirSensor(OAT)
The OAT is supplied with the economizer option or
accessory. It is wired through the 12-pin plug (PL6) in the
return air section of the unit and is mounted on the
economizer assembly.
Space Temperature Sensor (SPT)
There are 2 types of SPT sensors available from Carrier,
resistive input non-communicating (T55, T56, and T59)
and Rnet communicating (SPS, SPPL, SPP, and SPPF)
sensors. Each type has a variety of options consisting of:
timed override button, set point adjustment, a LCD
screen, and communication tie in. Space temperature can
be also be written to from a building network or zoning
system. However, it is still recommended that return air
duct sensor be installed to allow stand-alone operation for
back-up. Refer to the configuration section for details on
controller configurations associated with space sensors.
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