Bryant 581J RTU Open Controller Inputs and Outputs, Supply Air Temperature SAT Sensor

581J

Table 3 – RTU Open Controller Inputs and Outputs

		POINT NAME	BACnet OBJECT	TYPE OF I/O	CONNECTION PIN
			NAME		NUMBER(S)
			DEDICATED INPUTS
Space Temp / Zone Temp			zone_temp	AI (10K Thermistor)	J20--- 1, 2
Supply Air Temperature			sa_temp	AI (10K Thermistor)	J2--- 1, 2
Outdoor Air Temperature			oa_temp	AI (10K Thermistor)	J2--- 3, 4
Space Temperature Offset Pot			stpt_adj_offset	AI (100K Potentiometer)	J20--- 3
Safety Chain Feedback			safety_status	DI (24 VAC)	J1--- 9
Compressor Safety Status			comp_status	DI (24 VAC)	J1--- 2
Fire Shutdown Status			firedown_status	DI (24 VAC)	J1--- 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)
Outdoor Air CO2			oaq	AI (4--- 20 ma)	J4--- 2 or J4--- 5
Space Relative Humidity			space_rh	AI (4--- 20 ma)
Supply Fan Status*			sfan_status	DI (24 VAC)
Filter Status*			filter_status	DI (24 VAC)	J5--- 1 or J5---3 or
Door Contact Input*			door_contact_status	DI (24 VAC)	J5 5 or J5--- 7
Occupancy Contact*			occ_contact_status	DI (24 VAC)
			OUTPUTS
Economizer Output			econ_output	AO (4--- 20ma)	J2--- 5
Supply Fan Relay State			sfan	DO Relay (24VAC , 1A)	J1--- 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)	J11--- 3
Dehumidification Relay State			dehum	DO Relay (24VAC, 1A)	J11--- 7, 8
LEGEND
AI	---	Analog Input
AO ---		Analog Output
DI	---	Discrete Input
DO ---		Discrete Output

*These inputs (if installed) take the place of the default input on the specific channel according to schematic. Parallel pins J5--- 1 = J2--- 6, J5--- 3 = J1--- 10, J5---5 = J1--- 2 are used for field--- installation.

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.

SUPPLY AIR TEMPERATURE

SENSOR

SUPPLY AIR

ROOF CURB

RETURN AIR

C08200

Use two field-supplied, self-drilling screws to secure the sensor probe in a horizontal orientation. See Fig. 37.

Fig. 37 - Typical Mounting Location for Supply Air Temperature (SAT) Sensor on Small Rooftop Units

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.

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