Bryant 548J MCA/MOCP Determination Without C.O. or Unpwrd C.O, Elec. Htr, Type FLA DISC. Size

Page 49

Table 46 – MCA/MOCP DETERMINATION WITHOUT C.O. OR UNPWRD C.O.

		---HZ				ELEC. HTR								WITHOUT C.O. or UNPWR C.O.
		---HZ
UNIT		V---PH		IFM								WITHOUT P.E.							WITH P.E.
				IFM		Nom
				TYPE
				TYPE						FLA				DISC. SIZE									DISC. SIZE
		NOM.60				(kW)				FLA				DISC. SIZE									DISC. SIZE
						(kW)
						---				---	30.7	45		30	121		32.6		50			32			123
											MCA	MOCP		FLA	LRA		MCA	MOCP				FLA			LRA
														FLA	LRA							FLA			LRA
		---				3.3/4.4				15.9/18.3	50.6/53.6	60/60		48/51	137/139		52.5/55.5	60/60				51/53			139/141
		---1		DD---STD		4.9/6.5				23.5/27.1	60.1/64.6	70/70		57/61	145/148		62.0/66.5	70/70				59/63			147/150
		208/230		DD---STD		6.5/8.7				31.4/36.3	69.9/76.1	70/80		66/72	152/157		71.8/78.0	80/80				68/74			154/159
						6.5/8.7				31.4/36.3	69.9/76.1	70/80		66/72	152/157		71.8/78.0	80/80				68/74			154/159
						7.9/10.5				37.9/43.8	78.1/85.4	80/90		74/81	159/165		80.0/87.3	80/90				76/83			161/167
						9.8/13.0				46.9/54.2	89.3/98.4	90/100		84/92	215/229		91.2/100.3	100/110				86/95			217/231
						---				---	24.8	30		25	97		26.7		30			27			99
						3.3/4.4				9.2/10.6	36.3/38.1	45/45		35/37	106/108		38.2/40.0	45/50				37/39			108/110
				DD---STD		4.9/6.5				13.6/15.6	41.8/44.3	50/50		40/43	111/113		43.7/46.2	50/50				43/45			113/115
				DD---STD		6.5/8.7				18.1/20.9	47.4/50.9	50/60		46/49	115/118		49.3/52.8	50/60				48/51			117/120
						6.5/8.7				18.1/20.9	47.4/50.9	50/60		46/49	115/118		49.3/52.8	50/60				48/51			117/120
						7.9/10.5				21.9/25.3	52.2/56.4	60/60		50/54	119/122		54.1/58.3	60/60				52/56			121/124
		60				12.0/16.0				33.4/38.5	66.6/72.9	70/80		63/69	130/136		68.5/74.8	70/80				65/71			132/138
		60				---				---	22.6	30		22	109		24.5		30			24			111
		---				3.3/4.4				9.2/10.6	34.1/35.9	45/45		33/34	118/120		36.0/37.8	45/45				35/37			120/122
		---3		MED		4.9/6.5				13.6/15.6	39.6/42.1	45/50		38/40	123/125		41.5/44.0	50/50				40/42			125/127
		208/230		MED		6.5/8.7				18.1/20.9	45.2/48.7	50/50		43/46	127/130		47.1/50.6	50/60				45/48			129/132
						6.5/8.7				18.1/20.9	45.2/48.7	50/50		43/46	127/130		47.1/50.6	50/60				45/48			129/132
						7.9/10.5				21.9/25.3	50.0/54.2	50/60		47/51	131/134		51.9/56.1	60/60				50/53			133/136
						12.0/16.0				33.4/38.5	64.4/70.7	70/80		61/66	142/148		66.3/72.6	70/80				63/69			144/150
						---				---	22.6	30		22	120		24.5		30			24			122
548J*04						3.3/4.4				9.2/10.6	34.1/35.9	45/45		33/34	129/131		36.0/37.8	45/45				35/37			131/133
				HIGH		4.9/6.5				13.6/15.6	39.6/42.1	45/50		38/40	134/136		41.5/44.0	50/50				40/42			136/138
						6.5/8.7				18.1/20.9	45.2/48.7	50/50		43/46	138/141		47.1/50.6	50/60				45/48			140/143


						7.9/10.5				21.9/25.3	50.0/54.2	50/60		47/51	142/145		51.9/56.1	60/60				50/53			144/147
						12.0/16.0				33.4/38.5	64.4/70.7	70/80		61/66	153/159		66.3/72.6	70/80				63/69			155/161
						---				---	16.0	20		16	53		17.0		20			17			54
						6.0				7.2	25.0	30		24	60		26.0		30			26			61
				DD---STD		8.8				10.6	29.3	30		28	64		30.3		35			30			65
						11.5				13.8	33.3	35		32	67		34.3		35			33			68
						14.0				16.8	37.0	40		36	70		38.0		40			37			71
		---60				---				---	10.6	15		10	54		11.6		15			12			55
		---60				6.0				7.2	19.6	20		19	61		20.6		25			20			62
		---3		MED		8.8				10.6	23.9	25		23	65		24.9		25			24			66
		460				11.5				13.8	27.9	30		26	68		28.9		30			27			69
		460				14.0				16.8	31.6	35		30	71		32.6		35			31			72
						14.0				16.8	31.6	35		30	71		32.6		35			31			72
						---				---	10.6	15		10	60		11.6		15			12			61
						6.0				7.2	19.6	20		19	67		20.6		25			20			68
				HIGH		8.8				10.6	23.9	25		23	71		24.9		25			24			72
						11.5				13.8	27.9	30		26	74		28.9		30			27			75
						14.0				16.8	31.6	35		30	77		32.6		35			31			78
		60		DD---STD		---				---	5.4	15		5	5		7.4		15			7			7
		3---
		3---		MED		---				---	3.4	15		3	8		5.4		15			5			10
		---		MED		---				---	3.4	15		3	8		5.4		15			5			10
		---
		575		HIGH		---				---	2.9	15		3	12		4.9		15			5			14
				HIGH		---				---	2.9	15		3	12		4.9		15			5			14

LEGEND														Example: Supply voltage is 230-3-60
C.O.				---	Convenient outlet										AB = 224V
DD				---	Electric Drive X13 Motor										AB = 224V
DD				---	Electric Drive X13 Motor										BC = 231V
DISC				---	Disconnect										BC = 231V
DISC				---	Disconnect										AC = 226V
FLA				---	Full load amps										AC = 226V
IFM				---	Indoor fan motor												(224 + 231 + 226)							681
LRA				---	Locked rotor amps									Average Voltage =			(224 + 231 + 226)			=				681

																	3							3
MCA				---	Minimum circuit amps												3							3
MCA				---	Minimum circuit amps										=		227
MOCP				---	Maximum over current protection										=		227
MOCP				---	Maximum over current protection									Determine maximum deviation from average voltage.
P.E.				---	Power exhaust									Determine maximum deviation from average voltage.
UNPWRD C.O. ---					Unpowered convenient outlet									(AB) 227 – 224 = 3V			Maximum deviation is 4V.
NOTES:														(BC) 231 – 227 = 4V			Determine percent of voltage imbalance.
1. In compliance with NEC requirements for multimotor and														% Voltage Imbalance			= 100 x		4
		combination load equipment (refer to NEC Articles 430 and
																			227
																			227
		440), the overcurrent protective device for the unit shall be															= 1.76%
		fuse or HACR breaker. Canadian units may be fuse or cir-												This amount of phase imbalance is satisfactory as it is below the
		cuit breaker.
		cuit breaker.												maximum allowable 2%.
2. Unbalanced 3-Phase Supply Voltage														maximum allowable 2%.
2. Unbalanced 3-Phase Supply Voltage														IMPORTANT: If the supply voltage phase imbalance is more than
		Never operate a motor where a phase imbalance in supply												2%, contact your local electric utility company immediately.
		voltage is greater than 2%. Use the following formula to de-
		termine the percentage of voltage imbalance.
% Voltage Imbalance					= 100 x			max voltage deviation from average voltage

										average voltage
										average voltage

548J

49

Image 49

Contents Product Data Table of Contents Features and Benefits Model Number Nomenclature FACTORY-INSTALLED Options and FIELD-INSTALLED Accessories Factory Options AND/OR AccessoriesOption Accessory FieldPower Exhaust Pressure Relief Convenience Outlet powered or un-poweredFilter or Fan Status Switches Economizer dry-bulb or enthalpyAlternate Motors and Drives Motormaster Head Pressure ControllerThru-the-Base Connections Electric HeatersARI Cooling Rating Tables Sound Performance Table Minimum Maximum Airflows Electric HeatTons Physical Data548J*08 548J*09 8.5 TonsMotor Frame Size Fan Qty / Type Single Point KIT Part Number Crsinglexxxxxx Unit Electric Heat Electrical DataElectric Heater NOM APP Part Number PWR Type With Pwrd C.O208/230 Cont. Electric Heat Electrical DataElectric Drive X13 5 speed/torque motor 105A00 16.0 12.0/14.7 038A00 Without P.E With P.E CrheaterxxxxxxCool Cont. Electric Heat Electrical Data Tons575 460 115A00 33.0 30.3 050A00Dimensions 548J Weights & DimensionsUnit disconnect is mounted on panel Dimension Condition610 356 548J*04-07AC08679 C08680 356 Application Data Selection Procedure with 548J*07 Example Cooling Capacities Ambient Temperature548J*04 105 115 EA dB 9001200 548J*05 105 115 EA dB1400 1500 548J*06 105 115 EA dB2250 25001800 548J*07 105 115 EA dB2100 24002625 548J*08 105 115 EA dB3375 37502550 548J*09 105 115 EA dB2975 3400Heating Capacities Temperature AIR Entering Outdoor Coil F db at 70% rh548J*04 ReturnHeating Capacity 548J*08 Heating Capacity TonsGeneral fan performance notes Static Pressure Adders Factory Options and/or Accessories548J*04 Electric DRIVE, X13 MOTOR, 3 TON Horizontal Supply FAN Performance548J*04 Electric DRIVE, X13 MOTOR, 3 TON Vertical Supply Speed Torque CFM ESP BHP548J*05 Electric DRIVE, X13 MOTOR, 4 TON Vertical Supply 548J*05 Electric DRIVE, X13 MOTOR, 4 TON Horizontal Supply1200 1300 1400 1500 1600 1700 1800 1900 2000 548J*06 Electric DRIVE, X13 MOTOR, 5 TON Vertical Supply 548J*06 Electric DRIVE, X13 MOTOR, 5 TON Horizontal Supply1500 1625 1750 1875 2000 2125 2250 2375 2500 TON Horizontal Supply Available External Static Pressure IN. WG CFM RPM BHP 548J*05CFM RPM BHP 548J*06 1800 927 548J*071800 907 2250 509 548J*082250 788 847 2250 5282550 468 546 548J*092550 806 863 2550 495 570Unit MOTOR/DRIVE Combo Motor Pulley Turns Open Pulley Adjustment2000 1000 ECONOMIZER, Barometric Relief and PE Performance548J*04 Stage Cooling Electrical Information548J*05 Stage Cooling 548J*06 Stage Cooling548J*08 Stage Cooling Tons 548J*07 Stage Cooling548J*09 Stage Cooling Tons Range RLA LRAELEC. HTR MCA/MOCP Determination Without C.O. or Unpwrd C.OUnit IFM Without P.E With P.E Type FLA DISC. SizeELEC. HTR Unit Cont. MCA/MOCP Determination Without C.O. or Unpwrd C.OType FLA MCA76/82 70/7479/84 46/48High Unit IFM Type NOM STD MEDSee FLA DISC. Size MCA Mocp LRA65/68 41.5 19778/84 43.8 23469/72 45.7 20582/88 48.0 242ELEC. HTR With Pwrd C.O Unit IFM Without P.E With P.E MCA/MOCP Determination with Pwrd C.O111 Cont. MCA/MOCP Determination with Pwrd C.O113 10833.3 46.520.2 29.2Electric Heater With Pwrd C.O Without P.E With P.E Electric Heater With Pwrd C.O Unit IFM Without P.E With P.E 74/78 50.5 21088/93 52.8 247Stage Cooling Typical Power Diagram Typical Wiring DiagramsC09065 Multi-Protocol Option Diagram Stage Typical Wiring Diagram C09064 Sequence of Operation Continuous air circulation Automatic changeoverCycle-LOCprotection Emergency heatHvac Guide Specifications Guide Specifications 548J*04-0923 09 93 Sequence of Operations for Hvac Controls 23 09 33 Electric and Electronic Control System for Hvac23 81 19 Self-Contained Air Conditioners 23 40 13 Panel Air Filters548J 548J 548J 548J 548J Catalog No. PDS548J---01

548J specifications

The Bryant 548J is a high-efficiency gas furnace that combines advanced features and technologies to provide exceptional heating performance. Designed for residential applications, the furnace is notable for its ability to deliver consistent warmth while ensuring energy efficiency and reliability.

One of the main features of the Bryant 548J is its ultra-high efficiency rating, which allows homeowners to save significantly on energy costs. With an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96.5%, this furnace is designed to convert a large portion of fuel into usable heat. This is a remarkable characteristic that not only reduces utility bills but also contributes to a lower environmental footprint.

The 548J is equipped with a modulating gas valve and a variable-speed blower motor. The modulating gas valve enables the furnace to adjust its heating output based on real-time temperature demands, ensuring a more precise heating experience. This results in reduced temperature fluctuations within the home, providing a comfortable living environment. The variable-speed blower motor works in tandem with the modulating valve, facilitating improved air circulation and efficient temperature control.

Additionally, the Bryant 548J features a durable and compact design, making it suitable for various installation spaces. Its quality construction ensures longevity, while the optional stainless steel heat exchanger enhances its reliability. The furnace also includes a quiet operation mode, which minimizes noise levels, ensuring that the unit works quietly in the background without disturbing the household's peace.

Integration with smart home technology is another advantage of the Bryant 548J. Homeowners have the option to connect the furnace to a Wi-Fi-enabled thermostat, allowing for remote temperature control and monitoring. This feature offers enhanced convenience and the ability to optimize energy use according to a homeowner’s schedule.

For peace of mind, the Bryant 548J comes with a range of warranties, protecting the consumer's investment. Bryant’s commitment to quality is reflected in their extensive primary heating testing procedures, which ensure that each unit meets strict performance criteria before it reaches the customer.

In summary, the Bryant 548J is an efficient and reliable gas furnace that embodies advanced heating technology. With features such as high AFUE ratings, modulating gas valves, variable-speed blowers, and smart home compatibility, it stands out as a formidable option for modern residential heating solutions.