RTU-MP Controller Inputs and Outputs | Bryant 548J*14D instruction

Table 2 – RTU-MP Controller Inputs and Outputs

		POINT NAME	BACnet OBJECT	TYPE OF I/O	CONNECTION PIN
		POINT NAME	NAME	TYPE OF I/O	NUMBERS
			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)
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)
Filter Status			filtstat	DI (24 VAC)	J5 5,6 or J5---7,8

Remote Occupancy Input			remocc	DI (24 VAC)
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			ROOF
SENSOR	SUPPLY AIR	RETURN AIR	CURB
	SUPPLY AIR	RETURN AIR
			C10020

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

548J*14D specifications

The Bryant 548J*14D is a highly efficient and versatile air conditioning unit designed to meet the varying demands of residential and light commercial applications. This model stands out due to its advanced engineering, energy-saving features, and reliable performance, making it an ideal choice for homeowners looking to enhance comfort without compromising on energy efficiency.

One of the main features of the Bryant 548J*14D is its excellent SEER (Seasonal Energy Efficiency Ratio) rating, which signifies its ability to provide cooling while consuming less energy. Optimized for efficiency, this unit employs a high-efficiency compressor that adjusts its output based on cooling demands, allowing it to use only the energy necessary to maintain a comfortable environment.

The unit’s all-aluminum evaporator coil ensures durability and resistance to corrosion, contributing to its longer lifespan and consistent performance. Additionally, the Bryant 548J*14D incorporates advanced refrigeration technologies for maximum heat transfer efficiency. This technology not only enhances cooling performance but also improves overall system reliability.

A key characteristic of the Bryant 548J*14D is its Whisper Series technology designed for quiet operation. The low-noise design minimizes sound levels, allowing for unobtrusive cooling in residential spaces while still ensuring effective airflow and cooling capacity. This makes it particularly favorable for installation in bedrooms and other noise-sensitive areas.

Another noteworthy aspect of the Bryant 548J*14D is its compatibility with the MyBryant smartphone app, which enables homeowners to monitor and control their HVAC systems remotely. This connectivity offers convenience and helps to optimize energy usage, as users can adjust settings based on their schedules and preferences.

Furthermore, the Bryant 548J*14D is designed with a robustness that allows it to withstand diverse weather conditions, ensuring reliable performance even in extreme climates. The unit’s compact design eases installation in various settings, whether it's on rooftops, near walls, or on concrete pads.

In summary, the Bryant 548J*14D is a cutting-edge air conditioning unit that combines energy efficiency, quiet operation, and advanced technologies. With its robust construction, smart features, and reliable performance, it stands as a valuable solution for anyone looking to enhance comfort and save on energy costs in their homes or light commercial environments.

Table 2 – RTU-MP Controller Inputs and Outputs

TYPE OF I/O

CONNECTION PIN

NAME

NUMBERS

INPUTS

CONFIGURABLE INPUTS*

OUTPUTS

Dehumidification Relay State

Supply Air Temperature (SAT) Sensor —

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

548J*14D specifications