Bryant 558J MCA/MOCP Determination W/ Pwrd C.O, IFM No P.E FLA LRA, Type FLA MCA Mocp DISC. Size

558J

Table 34 – MCA/MOCP DETERMINATION W/ PWRD C.O.

	---PHV---HZ		ELECTRIC HEATER				NO C.O. or UNPWRD C.O.
UNIT		IFM				NO P.E.	FLA	LRA		w/ P.E. (pwrd fr/unit)			LRA
		TYPE	kW	FLA	MCA	MOCP	DISC. SIZE		MCA		MOCP	DISC. SIZE
			---	---	39.2	60	37	150	41.1		60	40	152
			4.9/6.5	23.5/27.1	39.2/40.0	60/60	37/37	150/150	41.1/42.4		60/60	40/40	152/152
	60	STD	6.5/8.7	31.4/36.3	45.4/51.5	60/60	42/47	150/150	47.8/53.9		60/60	44/50	152/152
			9.8/13.0	46.9/54.2	64.8/73.9	70/80	60/68	150/150	67.1/76.3		70/80	62/70	152/152
	---		13.1/17.4	62.8/72.5	84.6/96.8	90/100	78/89	150/150	87.0/99.1		90/100	80/91	152/152
	--- 1		15.8/21.0	75.8/87.5	100.9/115.5	110/125	93/106	150/150	103.3/117.9		110/125	95/108	152/152
	208/230
			---	---	41.3	60	40	175	43.2		60	42	177
			4.9/6.5	23.5/27.1	41.3/42.6	60/60	40/40	175/175	43.2/45.0		60/60	42/42	177/177
		MED	6.5/8.7	31.4/36.3	48.0/54.1	60/60	44/50	175/175	50.4/56.5		60/60	46/52	177/177
			9.8/13.0	46.9/54.2	67.4/76.5	70/80	62/70	175/175	69.8/78.9		70/80	64/73	177/177
			13.1/17.4	62.8/72.5	87.3/99.4	90/100	80/91	175/175	89.6/101.8		90/110	82/94	177/177
			15.8/21.0	75.8/87.5	103.5/118.1	110/125	95/109	175/175	105.9/120.5		110/125	97/111	177/177
			---	---	25.9	30	25	126	27.8		40	27	128
			4.9/6.5	13.6/15.6	25.9/25.9	30/30	25/25	126/126	27.8/28.0		40/40	27/27	128/128
		STD	7.9/10.5	21.9/25.3	33.5/37.8	40/40	31/35	126/126	35.9/40.1		40/45	33/37	128/128
			12.0/16.0	33.4/38.5	47.9/54.3	50/60	44/50	126/126	50.3/56.6		60/60	46/52	128/128
			15.8/21.0	43.8/50.5	60.9/69.3	70/70	56/64	126/126	63.3/71.6		70/80	58/66	128/128
	60		19.9/26.5	55.2/63.8	75.1/85.9	80/90	69/79	126/126	77.5/88.3		80/90	71/81	128/128
			---	---	26.2	40	26	144	28.1		40	28	146
	---		4.9/6.5	13.6/15.6	26.2/26.2	40/40	26/26	144/144	28.1/28.4		40/40	28/28	146/146
	--- 3	MED	7.9/10.5	21.9/25.3	33.9/38.1	40/40	31/35	144/144	36.3/40.5		40/45	33/37	146/146
	208/230		12.0/16.0	33.4/38.5	48.3/54.6	50/60	44/50	144/144	50.6/57.0		60/60	47/52	146/146
			15.8/21.0	43.8/50.5	61.3/69.6	70/70	56/64	144/144	63.6/72.0		70/80	59/66	146/146
			19.9/26.5	55.2/63.8	75.5/86.3	80/90	69/79	144/144	77.9/88.6		80/90	72/82	146/146
558J*06			---	---	28.5	40	28	170	30.4		45	30	172
			4.9/6.5	13.6/15.6	28.5/28.9	40/40	28/28	170/170	30.4/31.3		45/45	30/30	172/172
		HIGH	7.9/10.5	21.9/25.3	36.8/41.0	40/45	34/38	170/170	39.1/43.4		45/45	36/40	172/172
			12.0/16.0	33.4/38.5	51.1/57.5	60/60	47/53	170/170	53.5/59.9		60/60	49/55	172/172
			15.8/21.0	43.8/50.5	64.1/72.5	70/80	59/67	170/170	66.5/74.9		70/80	61/69	172/172
			19.9/26.5	55.2/63.8	78.4/89.1	80/90	72/82	170/170	80.8/91.5		90/100	74/84	172/172
			---	---	12.5	20	12	60	13.5		20	13	61
			6.0	7.2	12.5	20	12	60	13.5		20	13	61
		STD	11.5	13.8	19.9	20	18	60	21.1		25	19	61
			14.0	16.8	23.6	25	22	60	24.9		25	23	61
			23.0	27.7	37.3	40	34	60	38.5		40	35	61
			25.5	30.7	41.0	45	38	60	42.3		45	39	61
	60		---	---	13.0	20	13	69	14.0		20	14	70
			6.0	7.2	13.0	20	13	69	14.0		20	14	70
	3---	MED	11.5	13.8	20.5	25	19	69	21.8		25	20	70
	---		14.0	16.8	24.3	25	22	69	25.5		30	23	70
	460		23.0	27.7	37.9	40	35	69	39.1		40	36	70
			25.5	30.7	41.6	45	38	69	42.9		45	39	70
			---	---	13.8	20	14	82	14.8		20	15	83
			6.0	7.2	13.8	20	14	82	14.8		20	15	83
		HIGH	11.5	13.8	21.5	25	20	82	22.8		25	21	83
			14.0	16.8	25.3	30	23	82	26.5		30	24	83
			23.0	27.7	38.9	40	36	82	40.1		45	37	83
			25.5	30.7	42.6	45	39	82	43.9		45	40	83
	60	STD	---	---	9.8	15	10	46	11.7		15	12	48
	3---	MED	---	---	10.7	15	11	63	12.6		15	13	65
	---
	575	HIGH	---	---	10.7	15	11	63	12.6		15	13	65

LEGEND:
CO	---	Convenient outlet
DISC	---	Disconnect
FLA	---	Full load amps
IFM	---	Indoor fan motor
LRA	---	Locked rotor amps
MCA	---	Minimum circuit amps
MOCP	--- Maximum over current protection
PE	---	Power exhaust
UNPWRD CO	---	Unpowered convenient outlet
NOTES:

1.In compliance with NEC requirements for multimotor and combina- tion 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 determine the percentage of voltage imbalance.

% Voltage Imbalance = 100 x	max voltage deviation from average voltage
	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	Maximum deviation is 4 v.
(BC) 231 – 227 = 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%, con- tact your local electric utility company immediately.

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