Bryant 548J*14D RTU-MP Controller Inputs and Outputs, Supply Air Temperature SAT Sensor

Table 2 – RTU-MP Controller Inputs and Outputs

		POINT NAME	BACnet OBJECT	TYPE OF I/O	CONNECTION PIN
			NAME		NUMBERS
			INPUTS
Space Temperature Sensor			sptsens	AI (10K Thermistor)	J20---1, 2
Supply Air Temperature			sat	AI (10K Thermistor)	J2---1, 2
Local Outside Air Temperature Sensor			oatsens	AI (10K Thermistor)	J2---3, 4
Space Temperature Offset Pot			sptopot	AI (100K Potentiometer)	J20---3
Indoor Air Quality			iaq	AI (4---20 ma)	J4---2, 3
Outdoor Air Quality			oaq	AI (4---20 ma)	J4---5, 6
Safety Chain Feedback			safety	DI (24 VAC)	J1---9
Compressor Safety			compstat	DI (24 VAC)	J1---2
Fire Shutdown			firedown	DI (24 VAC)	J1---10
Enthalpy Switch			enthalpy	DI (24 VAC)	J2---6, 7
Humidistat Input Status			humstat	DI (24 VAC)	J5---7, 8
			CONFIGURABLE INPUTS*
Space Relative Humidity			sprh	AI (4---20 ma)	J4---2,3 or J4---5,6
Outside Air Relative Humidity			oarh	AI (4---20 ma)
Supply Fan Status			fanstat	DI (24 VAC)	J5---1,2 or J5---3,4 or
Filter Status			filtstat	DI (24 VAC)
					J5 5,6 or J5---7,8
Remote Occupancy Input			remocc	DI (24 VAC)
			OUTPUTS
Economizer Commanded Position			econocmd	4---20ma	J2---5
Supply Fan Relay State			sf	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			aux_2	DO Relay (24VAC , 1A)	J11---3
Dehumidification Relay State			humizer	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.

548J*14D

The RTU-MP controller requires the use of a Bryant space sensor. A standard thermostat cannot be used with the RTU-MP system.

Supply Air Temperature (SAT) Sensor —

On FIOP-equipped 548J*14D 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. 36.

SUPPLY AIR			ROOF
TEMPERATURE
SENSOR	SUPPLY AIR	RETURN AIR	CURB
			C10020

Fig. 36 - Typical Mounting Location for Supply Air Temperature (SAT) Sensor on Small Rooftop Units

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