Bryant manual 558J*05

Table 33 – MCA/MOCP DETERMINATION NO C.O. OR UNPWRD C.O.

	HZ		ELECTRIC HEATER				NO C.O. or UNPWRD C.O.
UNIT
	---PHV---	IFM			MCA	NO P.E.	FLA	LRA	MCA	w/ P.E. (pwrd fr/unit)			LRA
		TYPE	kW	FLA		MOCP					MOCP	FLA
							DISC. SIZE					DISC. SIZE
			---	---	33.7	50	32	133	35.6		50	35	135
			3.3/4.4	15.9/18.3	33.7/33.7	50/50	32/32	133/133	35.6/35.6		50/50	35/35	135/135
		STD	6.5/8.7	31.4/36.3	45.4/51.5	50/60	42/47	133/133	47.8/53.9		50/60	44/50	135/135
	--- 60		9.8/13.0	46.9/54.2	64.8/73.9	70/80	60/68	133/133	67.1/76.3		70/80	62/70	135/135
			13.1/17.4	62.8/72.5	84.6/96.8	90/100	78/89	133/133	87.0/99.1		90/100	80/91	135/135
	--- 1
			15.8/21.0	75.8/87.5	100.9/115.5	110/125	93/106	133/133	103.3/117.9		110/125	95/108	135/135
	208/230		6.5/8.7	31.4/36.3	45.4/51.5	50/60	42/47	133/133	47.8/53.9		50/60	44/50	135/135
			---	---	33.7	50	32	133	35.6		50	35	135
			3.3/4.4	15.9/18.3	33.7/33.7	50/50	32/32	133/133	35.6/35.6		50/50	35/35	135/135
		MED	9.8/13.0	46.9/54.2	64.8/73.9	70/80	60/68	133/133	67.1/76.3		70/80	62/70	135/135
			13.1/17.4	62.8/72.5	84.6/96.8	90/100	78/89	133/133	87.0/99.1		90/100	80/91	135/135
			15.8/21.0	75.8/87.5	100.9/115.5	110/125	93/106	133/133	103.3/117.9		110/125	95/108	135/135
			---	---	23.5	30	23	99	25.4		30	25	101
			4.9/6.5	13.6/15.6	23.5/25.6	30/30	23/24	99/99	25.5/28.0		30/30	25/26	101/101
		STD	6.5/8.7	18.1/20.9	28.8/32.3	30/35	26/30	99/99	31.1/34.6		35/35	29/32	101/101
			12.0/16.0	33.4/38.5	47.9/54.3	50/60	44/50	99/99	50.3/56.6		60/60	46/52	101/101
	60		15.8/21.0	43.8/50.5	60.9/69.3	70/70	56/64	99/99	63.3/71.6		70/80	58/66	101/101
			---	---	23.5	30	23	99	25.4		30	25	101
	3---
			4.9/6.5	13.6/15.6	23.5/25.6	30/30	23/24	99/99	25.5/28.0		30/30	25/26	101/101
	---
		MED	6.5/8.7	18.1/20.9	28.8/32.3	30/35	26/30	99/99	31.1/34.6		35/35	29/32	101/101
558J*05	208/230
		HIGH	6.5/8.7	18.1/20.9	29.1/32.6	30/35	27/30	117/117	31.5/35.0		35/40	29/32	119/119
			12.0/16.0	33.4/38.5	47.9/54.3	50/60	44/50	99/99	50.3/56.6		60/60	46/52	101/101
			15.8/21.0	43.8/50.5	60.9/69.3	70/70	56/64	99/99	63.3/71.6		70/80	58/66	101/101
			---	---	23.8	30	23	117	25.7		30	26	119
			4.9/6.5	13.6/15.6	23.8/26.0	30/30	23/24	117/117	25.9/28.4		30/30	26/26	119/119
			12.0/16.0	33.4/38.5	48.3/54.6	50/60	44/50	117/117	50.6/57.0		60/60	47/52	119/119
			15.8/21.0	43.8/50.5	61.3/69.6	70/70	56/64	117/117	63.6/72.0		70/80	59/66	119/119
			---	---	10.7	15	10	49	11.7		15	12	50
			6.0	7.2	11.6	15	11	49	12.9		15	12	50
		STD	11.5	13.8	19.9	20	18	49	21.1		25	19	50
			14.0	16.8	23.6	25	22	49	24.9		25	23	50
			23.0	27.7	37.3	40	34	49	38.5		40	35	50
	60		---	---	10.7	15	10	49	11.7		15	12	50
			6.0	7.2	11.6	15	11	49	12.9		15	12	50
	3---
		MED	11.5	13.8	19.9	20	18	49	21.1		25	19	50
	---
			14.0	16.8	23.6	25	22	49	24.9		25	23	50
	460
			23.0	27.7	37.3	40	34	49	38.5		40	35	50
			---	---	11.2	15	11	58	12.2		15	12	59
			6.0	7.2	12.3	15	11	58	13.5		15	12	59
		HIGH	11.5	13.8	20.5	25	19	58	21.8		25	20	59
			14.0	16.8	24.3	25	22	58	25.5		30	23	59
			23.0	27.7	37.9	40	35	58	39.1		40	36	59
	3--- 60	STD	---	---	7.3	15	7	44	9.2		15	9	46
		MED	---	---	7.3	15	7	44	9.2		15	9	46
	575---
		HIGH	---	---	7.4	15	7	50	9.3		15	10	52

558J

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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