Carrier 48AJ installation instructions Unbalanced 3-Phase Supply Voltage

Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet (cont)

UNIT	VOLTAGE	VOLTAGE					COMPRESSOR						CONDENSER		EVAPORATOR		POWER	POWER SUPPLY
SIZE		RANGE		Cir A, No. 1		Cir A, No. 2			Cir B, No. 1		Cir B, No. 2		FAN MOTOR		FAN MOTOR		EXHAUST
	3 PH, 60 Hz
48A		Min	Max	RLA	LRA	RLA		LRA	RLA	LRA	RLA	LRA	Qty	FLA	Hp	FLA	FLA (total)	MCA	MOCP*
															20	59.4	—	250.5	300
																	35.4	285.9	300
															25	74.8	—	269.7	300
														6.5			35.4	305.1	350
	208	187	229	34.3	265	34.3		265	34.3	265	34.3	265	6
														(ea)	30	88	—	286.2	350
																	35.4	321.6	400
															40	114	—	318.7	400
																	35.4	354.1	450
															20	54	—	244.3	250
																	35.4	279.7	300
															25	68	—	261.8	300
														6.6			35.4	297.2	350
	230	207	253	34.3	265	34.3		265	34.3	265	34.3	265	6
														(ea)	30	80	—	276.8	350
																	35.4	312.2	350
															40	104	—	306.8	400
051																	35.4	342.2	400
															20	27	—	117.6	125
																	18.9	136.5	150
															25	34	—	126.3	150
	460	414	508	16	120	16		120	16	120	16	120	6	3.3			18.9	145.2	175
														(ea)	30	40	—	133.8	150
																	18.9	152.7	175
															40	52	—	148.8	200
																	18.9	167.7	200
															20	22	—	94.7	110
																	14.4	109.1	125
															25	27	—	101.0	125
														2.6			14.4	115.4	125
	575	518	632	12.9	80	12.9		80	12.9	80	12.9	80	6
														(ea)	30	32	—	107.2	125
																	14.4	121.6	150
															40	41	—	118.5	150
																	14.4	132.9	150
															25	75.0	—	308.1	350
																	35.4	343.5	400
	208	187	229	40.8	265	47		380	40.8	265	47	380	6	6.5	30	88.0	—	324.6	400
														(ea)			35.4	360.0	400
															40	114.0	—	357.1	450
																	35.4	392.5	450
															25	68.0	—	300.2	350
																	35.4	335.6	350
	230	207	253	40.8	265	47		380	40.8	265	47	380	6	6.6	30	80.0	—	315.2	350
														(ea)			35.4	350.6	400
															40	104.0	—	345.2	400
060																	35.4	380.6	450
															25	34.0	—	147.5	175
																	18.9	166.4	175
	460	414	508	20.2	135	22.4		175	20.2	135	22.4	175	6	3.3	30	40.0	—	155.0	175
														(ea)			18.9	173.9	200
															40	52.0	—	170.0	200
																	18.9	188.9	225
															25	27.0	—	119.8	125
																	18.9	138.7	150
	575	518	632	16.6	120	18.6		140	16.6	120	18.6	140	6	2.6	30	32.0	—	126.0	150
														(ea)			18.9	144.9	175
															40	41.0	—	137.3	175
																	18.9	156.2	175

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection NEC — National Electrical Code

RLA — Rated Load Amps

*Fuse or HACR circuit breaker per NEC.

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. The 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 percent of voltage imbalance.

% Voltage imbalance

max voltage deviation from average voltage

= 100 x

average voltage

Example: Supply voltage is 460-3-60. AB = 452 v

BC = 464 v AC = 455 v

452 + 464 + 455

Average Voltage =

3

= 1371 3

= 457

Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v Maximum deviation is 7 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x	7
	457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the max- imum allowable 2%.

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

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