Carrier 48TC*D08 appendix Mca/Mocp Determination No C.O. Or Unpwrd C.O

MCA/MOCP DETERMINATION NO C.O. OR UNPWRD C.O.

UNIT			COMBUSTION	POWER			NO C.O. or UNPWRD C.O.
	NOM.	IFM	FAN MOTOR	EXHAUST		NO P.E.				w/ P.E. (pwrd fr/ unit)
	V---Ph---Hz	TYPE					DISC. SIZE					DISC. SIZE
			FLA	FLA	MCA	MOCP			MCA		MOCP
							FLA	LRA				FLA	LRA
		STD			43.6	50	46	198	47.4		60	51	202
	208/230--- 3--- 60	MED	0.48	3.8	45.9	50	49	235	49.7		60	53	239
48TC*D08		HIGH			53.8	60	58	261	57.6		70	62	265
		STD			20.1	25	21	97	21.9		25	23	99
	460--- 3--- 60	MED	0.25	1.8	20.9	25	22	116	22.7		25	24	118
		HIGH			25.3	30	27	129	27.1		30	29	131
		STD			14.8	20	16	79	18.6		20	20	83
	575--- 3--- 60	MED	0.24	3.8	15.2	20	16	94	19.0		25	21	98
		HIGH			18.3	20	19	108	22.1		25	24	112
		STD			48.5	60	51	263	52.3		60	56	267
	208/230--- 3--- 60	MED	0.48	3.8	53.3	60	57	306	57.1		70	61	310
48TC*D12		HIGH			58.3	70	62	315	62.1		70	67	319
		STD			23.7	30	25	125	25.5		30	27	127
	460--- 3--- 60	MED	0.25	1.8	25.5	30	27	147	27.3		30	29	149
		HIGH			28.5	35	31	151	30.3		35	33	153
		STD			17.9	20	19	95	21.7		25	23	99
	575--- 3--- 60	MED	0.24	3.8	18.7	25	20	106	22.5		25	24	110
		HIGH			21.5	25	23	120	25.3		30	27	124
		STD	0.48	3.8	65.5	80	69	365	69.3		80	73	369
	208/230--- 3--- 60	MED			68.0	80	72	382	71.8		80	76	386
48TC*D14		HIGH	Model not available	due to high amperage draw.
		STD			31.7	40	33	183	33.5		40	35	185
	460--- 3--- 60	MED	0.25	1.8	32.7	40	35	192	34.5		45	37	194
		HIGH			35.7	45	38	196	37.5		45	40	198
		STD			24.0	30	25	144	27.8		30	30	148
	575--- 3--- 60	MED	0.24	3.8	24.0	30	25	144	27.8		30	30	148
		HIGH			26.8	30	29	158	30.6		35	33	162

LEGEND:					Example: Supply voltage is 230-3-60
						AB = 224 v
CO	---	Convenient outlet
DISC	---	Disconnect				BC = 231 v
FLA	---	Full load amps				AC = 226 v
IFM	---	Indoor fan motor
LRA	---	Locked rotor amps				(224 + 231 + 226)		681
MCA	---	Minimum circuit amps			Average Voltage =			=
MOCP	--- Maximum over current protection					3		3
PE	---	Power exhaust
UNPWRD CO	---	Unpowered convenient outlet			=	227
NOTES:
1. In compliance with NEC requirements for multimotor and					Determine maximum deviation from average voltage.
combination load equipment (refer to NEC Articles 430 and					(AB) 227 – 224 = 3 v
440), the overcurrent protective device for the unit shall be					(BC) 231 – 227 = 4 v
fuse or HACR breaker. Canadian units may be fuse or circuit					(AC) 227 – 226 = 1 v
breaker.
					Maximum deviation is 4 v.
2. Unbalanced 3-Phase Supply Voltage
					Determine percent of voltage imbalance.
Never operate a motor where a phase imbalance in supply
voltage is	greater than 2%. Use the following formula to				% Voltage Imbalance		= 100 x	4
determine the percentage of voltage imbalance.
								227
						= 1.76%
% Voltage Imbalance		= 100 x	max voltage deviation from average voltage		This amount of phase imbalance is satisfactory as it is below the
				average voltage
					maximum allowable 2%.

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

48TC

95