Carrier 48TC**16 installation instructions Unit Wire/Fuse or Hacr Breaker Sizing Data, Brkr

Table 10 – 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
					MCA	or			MCA		or
						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
48TC*D16		HIGH			81.2	100	86	432	85.0		100	91	436
		STD			34	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			40.8	50	43	252	42.6		50	45	254
		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			32.7	40	35	196	36.5		45	39	200

Table 10 — 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
48TC*D16		HIGH			86.0	100	92	437	89.8		100	96	441
		STD			36.2	45	38	236	38		50	40	238
	460--- 3--- 60	MED	0.25	1.8	37.2	50	39	245	39.0		50	41	247
		HIGH			43.0	50	46	254	44.8		50	48	256
		STD			28.2	35	30	186	32		40	34	190
	575--- 3--- 60	MED	0.24	3.8	28.2	35	30	186	32		40	34	190
		HIGH			34.4	40	37	198	38.2		45	41	202

48TC**16

Legend and Notes for Table 10

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
P.E.	---	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.

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