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Table 3 – RTU Open Controller 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 20 --- 1 , 2
Supply Air Temperature sa_temp AI (10K Thermistor) J 2 --- 1, 2
Outdoor Air Temperature oa_temp AI (10K Thermistor) J 2 --- 3, 4
Space Temperature Offset Pot stpt_adj_offset AI (100K Potentio meter) J 20 --- 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 --- 10
Enthalpy Status enthalpy_status DI (24 VAC) J2 --- 6
Humidistat Input Status humstat_status DI (24 VAC) J5 --- 7
CONFIGURABLE INPUTS
Indoor Air CO2 iaq AI (4 --- 20 ma )
J4 --- 2 or J 4 --- 5Outdoor Air CO2 oaq AI (4 --- 20 ma )
Space Relative Humidity space_rh AI (4 --- 20 ma )
Supply Fan Status* sfan_status DI (24 VAC)
J5 --- 1 or J 5 --- 3 or
J55orJ5---7
Filter Status* filter_status DI (24 V AC)
Door Contact Input* door_contact_status DI (24 VAC)
Occupancy Contact* occ_contact_status DI (24 VAC)
OUTPUTS
Economizer Output econ_output AO (4 --- 20ma ) J2 --- 5
SupplyFanRelayState sfan DO Relay ( 24VAC , 1A) J 1 --- 4
Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J1 --- 8
Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J1 --- 7
Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J1 --- 6
Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J1 --- 5
Power Exhaust Relay State pexh DO Relay ( 24VAC , 1A) J1 1 --- 3
Dehumidification Relay State dehum DO Relay (24VAC, 1A) J 11 --- 7, 8
LEGEND
AI --- An alo g Inp ut
AO --- An alo g Ou tp ut
DI --- Di scr ete Inp ut
DO --- Discr ete Output
* These inputs (if installed) take the place of the default input on the specific channel according to schematic.
Para lle l p ins J 5 --- 1 = J2 --- 6 , J5 --- 3 = J 1 --- 10, J 5 --- 5 = J1 --- 2 ar e used fo r field --- in sta lla tio n.
The RTU Open controller requires the use of a Bryant
space sensor. A standard thermostat cannot be used with
the RTU Open system.
Supply Air Temperature (SAT) Sensor —
On FIOP--equipped 581J unit, the unit is supplied with a
supply--air temperature (SAT) sensor (33ZCSENSAT). This
sensor is a tubular probe type, approx 6--inches (12.7 mm) in
length. It is a nominal 10--k ohm thermistor.
The SAT is factory--wired. The SAT probe is wire--tied to
the supply--air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re--position the sensor in the flange of the supply--air
opening or in the supply air duct (as required by local
codes). Drill or punch a
1
/
2
--in. hole in the flange or duct.
Use two field--supplied, self--drilling screws to secure the
sensor probe in a horizontal orientation. See Fig. 37.
Outdoor Air Temperature (OAT) Sensor —
The OAT is factory--mounted in the EconoMi$er2 (FIOP or
accessory). It is a nominal 10k ohm thermistor attached to
an eyelet mounting ring.
SUPPLY AIR
RETURN AIR
SUPPLY AIR
TEMPERATURE
SENSOR
ROOF
CURB
C08200
Fig. 37 -- Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
581J