Bryant 558F, 551B manual ELECTRICAL DATA - 551A155,180, Electrical Data

ELECTRICAL DATA

ELECTRICAL DATA — 551A155,180

UNIT	NOMINAL	VOLTAGE			COMPRESSOR				OFM			IFM		POWER		ELECTRIC			POWER SUPPLY
	VOLTAGE	RANGE		No. 1		No. 2								EXHAUST			HEAT*
551A	(3 Ph, 60 Hz)
		Min	Max	RLA	LRA	RLA	LRA	Qty	Hp	FLA (ea)	Hp		FLA	FLA	LRA	kW		FLA	MCA	MOCP†
														—	—	—		—	59/ 59	70/ 70
														4.6	18.8	—		—	64/ 63	80/ 80
														—	—	14/19		39/ 45	60/ 67	70/ 70
	208/230	187	253	20.7	156	19.3	123	3	0.5	1.7	2.9		8.8/	4.6	18.8	14/19		39/ 45	66/ 73	80/ 80
													8.4	—	—	26/34		71/ 82	100/113	100/125
														4.6	18.8	26/34		71/ 82	106/119	110/125
155														—	—	42/56		117/135	157/146	175/175
														4.6	18.8	42/56		117/135	163/151	175/175
(Standard
IFM)														—	—	—		—	29	35
														2.3	6.0	—		—	31	40
														—	—	15		18	29	35
	460	414	508	10	70	10	62	3	0.5	0.8	2.9		4.2	2.3	6.0	15		18	31	40
														—	—	32		39	54	60
														2.3	6.0	32		39	57	60
														—	—	55		66	71	80
														2.3	6.0	55		66	74	80
														—	—	—		—	61/ 61	80/ 80
														4.6	18.8	—		—	65/ 66	80/ 80
														—	—	14/19		39/ 45	62/ 70	80/ 80
	208/230	187	253	20.7	156	19.3	123	3	0.5	1.7	3.7		11.0/	4.6	18.8	14/19		39/ 45	68/ 76	80/ 80
													10.5	—	—	26/34		71/ 82	102/116	110/125
														4.6	18.8	26/34		71/ 82	108/122	110/125
155														—	—	42/56		117/135	159/149	175/175
														4.6	18.8	42/56		117/135	165/155	175/175
(Optional
IFM)														—	—	—		—	30	35
														2.3	6.0	—		—	32	40
														—	—	15		18	30	35
	460	414	508	10	70	10	62	3	0.5	0.8	3.7		4.8	2.3	6.0	15		18	32	40
														—	—	32		39	55	60
														2.3	6.0	32		39	58	60
														—	—	55		66	72	80
														2.3	6.0	55		66	75	80
														—	—	—		—	82/ 82	110/110
														4.6	18.8	—		—	86/ 86	110/110
														—	—	26/34		71/ 82	109/122	110/125
	208/230	187	253	32.1	195	20.7	156	3	0.5	1.7	5.0		15.8/	4.6	18.8	26/34		71/ 82	114/128	125/150
													15.8	—	—	42/56		117/135	166/155	175/175
														4.6	18.8	42/56		117/135	172/161	175/175
														—	—	56/75		156/180	176/200	200/225
180														4.6	18.8	56/75		156/180	182/206	200/225
														—	—	—		—	41	50
														2.3	6.0	—		—	43	50
														—	—	32		39	59	60
	460	414	508	16.4	95	10	70	3	0.5	0.8	5.0		7.9	2.3	6.0	32		39	62	70
														—	—	55		66	76	90
														2.3	6.0	55		66	79	90
														—	—	80		96	106	125
														2.3	6.0	80		96	109	125

-180

	LEGEND
FLA	— Full Load Amps
HACR	— Heating, Air Conditioning and Refrigeration
IFM	— Indoor (Evaporator) Fan Motor
LRA	— Locked Rotor Amps
MCA	— Minimum Circuit Amps
MOCP	— Maximum Overcurrent Protection
NEC	— National Electrical Code
OFM	— Outdoor (Condenser) Fan Motor
RLA	— Rated Load Amps

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 380 v, 480 v, and 575 v. Heat- ers are rated at 240 v, 480 v, or 575 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly. To determine heater capacity at actual unit voltage, multiply 240 v, 480 v, or 575 v capacity by multipliers found in table on page 150.

†Fuse or HACR circuit breaker.

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

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

Average Voltage = 452 + 464 + 455

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 voltage imbalance.

fuse or HACR breaker. The Canadian units may be fuse or circuit breaker.

2. Unbalanced 3-Phase Supply Voltage

% Voltage Imbalance = 100 x

7

551A155

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

457

= 1.53%

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.

3.MCA calculation for 551A155,180 units with electric heaters over 50 kW = (1.25 x IFM amps) + (1.00 x heater FLA).

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