Bryant 580J*16D instruction manual Unit Wire/Fuse or Hacr Breaker Sizing Data

580J*16D

Table 1 – Unit Wire/Fuse or HACR Breaker Sizing Data

			COMBUSTION	POWER			NO C.O. or UNPWR C.O.
			FAN MOTOR	EXHAUST
UNIT	NOM.	IFM				NO P.E.			w/ P.E. (pwrd fr/ unit)
	V---Ph---Hz	TYPE	FLA	FLA		FUSE	DISC. SIZE			FUSE	DISC. SIZE
						or				or
					MCA				MCA
						HACR	FLA	LRA		HACR	FLA	LRA
						BRKR				BRKR
		STD			68.3	80	71	396	72.1	80	76	400
	208/230---3---60	MED	0.48	3.8	70.8	80	74	413	74.6	90	79	417
		HIGH			77.8/75.8	100/100	82/80	424	81.6/79.6	100/100	87/84	428
580J*16D
		STD			34.0	45	35	234	35.8	45	37	236
	460--- 3--- 60	MED	0.25	1.8	35.0	45	37	243	36.8	45	39	245
		HIGH			38.2	50	40	248	40.0	50	42	250
		STD			26.5	30	28	184	30.3	40	32	188
	575--- 3--- 60	MED	0.24	3.8	26.5	30	28	184	30.3	40	32	188
		HIGH			29.8	35	31	187	33.6	40	36	191

Table 1 — Unit Wire/Fuse or HACR Breaker Sizing Data (cont)

			COMBUSTION	POWER				w/ PWRD C.O.
			FAN MOTOR	EXHAUST
UNIT	NOM.	IFM				NO P.E.			w/ P.E. (pwrd fr/ unit)
	V---Ph---Hz	TYPE	FLA	FLA		FUSE	DISC. SIZE			FUSE	DISC. SIZE
						or				or
					MCA				MCA
						HACR	FLA	LRA		HACR	FLA	LRA
						BRKR				BRKR
		STD			73.1	80	77	401	76.9	100	81	405
	208/230---3---60	MED	0.48	3.8	75.6	100	80	418	79.4	100	84	422
		HIGH			82.6/80.6	100/100	88/85	429	86.4/84.4	100/100	92/90	433
580J*16D
		STD			36.2	45	38	236	38.0	50	40	238
	460--- 3--- 60	MED	0.25	1.8	37.2	50	39	245	39.0	50	41	247
		HIGH			40.4	50	43	250	42.2	50	45	252
		STD			28.2	35	30	186	32.0	40	34	190
	575--- 3--- 60	MED	0.24	3.8	28.2	35	30	186	32.0	40	34	190
		HIGH			31.5	40	33	189	35.3	45	38	193

Legend and Notes for Table 1

LEGEND:
BRKR	---	Circuit breaker
CO	---	Convenience outlet
DISC	---	Disconnect
FLA	---	Full load amps
IFM	---	Indoor fan motor
LRA	---	Locked rotor amps
MCA	---	Minimum circuit amps
PE	---	Power exhaust
PWRD CO	---	Powered convenient outlet
UNPWR CO	---	Unpowered convenient outlet
NOTES:

1.In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. Canadian units may be fuse or circuit breaker.

2.Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to de- termine the percentage of voltage imbalance.

max voltage deviation from average voltage

% Voltage Imbalance = 100 x

average voltage

Example: Supply voltage is 230-3-60

AB = 224 v

BC = 231 v

AC = 226 v

Average Voltage =	(224 + 231 + 226)	=	681
	3		3

=227

Determine maximum deviation from average voltage. (AB) 227 – 224 = 3 v

(BC) 231 – 227 = 4 v (AC) 227 – 226 = 1 v Maximum deviation is 4 v.

Determine percent of voltage imbalance.

% Voltage Imbalance	= 100 x	4
		227
	= 1.76%

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

2011 Bryant Heating and Cooling Systems. D 7310 W. Morris St. D Indianapolis, IN 46231	Printed in U.S.A.	Edition Date: 01/11	Catalog No: SS580J---02
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.			Replaces: New

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