Bryant 551B, 551A manual ELECTRICAL DATA - 558F180-300 cont, ELECTRICAL DATA cont

ELECTRICAL DATA (cont)

ELECTRICAL DATA — 558F180-300 (cont)

		NOMINAL	VOLTAGE			COMPRESSOR					OFM			IFM	POWER		ELECTRIC			POWER SUPPLY
UNIT		VOLTAGE	RANGE		NO. 1			NO.2							EXHAUST		HEAT*
558F		(3 Ph, 60 Hz)	Min	Max	RLA		LRA	RLA	LRA	Qty	Hp	FLA	Hp	FLA	FLA	LRA	kW	FLA		MCA	MOCP†
												(ea)
															—	—	—	—		124/124	150/150
															4.6	18.8	—	—		129/129	150/150
															—	—	26/34	71/ 82		124/134	150/150
	208/230		187	253	42		239	33.6	225	2	1	6.6	7.5	25.0/25.0	4.6	18.8	26/34	71/	82	129/140	150/150
															—	—	42/56	117/135		178/166	200/175
															4.6	18.8	42/56	117/135		183/172	200/175
															—	—	56/75	156/180		187/211	200/225
240															4.6	18.8	56/75	156/180		193/217	200/225
															—	—	—	—		61	80
															2.3	6	—	—		63	80
															—	—	32	39		65	80
	460		414	508	19.2		125	17.3	114	2	1	3.3	7.5	13.0	2.3	6	32	39		68	80
															—	—	55	66		82	90
															2.3	6	55	66		85	90
															—	—	80	96		112	125
															2.3	6	80	96		115	125
															—	—	—	—		138/138	175/175
															4.6	18.8	—	—		143/143	175/175
															—	—	26/34	71/ 82		138/138	175/175
	208/230		187	253	41.4		312	47.1	245	6	0.5	1.7	10.0	28.0/28.0	4.6	18.8	26/34	71/	82	143/143	175/175
															—	—	42/56	117/135		181/170	200/175
															4.6	18.8	42/56	117/135		187/176	200/200
															—	—	56/75	156/180		191/215	200/225
300															4.6	18.8	56/75	156/180		197/221	200/225
															—	—	—	—		64	80
															2.3	6	—	—		66	80
															—	—	32	39		67	80
	460		414	508	20		150	19.6	125	6	0.5	0.8	10.0	14.6	2.3	6	32	39		70	80
															—	—	55	66		84	90
															2.3	6	55	66		87	100
															—	—	80	96		114	125
															2.3	6	80	96		117	125

LEGEND AND NOTES FOR ELECTRICAL DATA TABLES

558F180-300

	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, 480 v, and 600 v. Heaters are rated at 240 v, 480 v, or 600 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly. To deter- mine heater capacity at actual unit voltage, multiply 240 v, 480 v, or 600 v capac- ity by multipliers found in table on page 130. Electric heaters are field installed.

†Fuse or HACR circuit breaker.

NOTES:

1. In compliance with NEC requirements for multimotor and combination load

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.

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

% Voltage Imbalance = 100 x

7

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

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%, con- tact your local electric utility company immediately.

3.MCA calculation for 558F180-300 units with electric heaters over 50 kW = (1.25 x IFM amps) + (1.00 x heater FLA).

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