Bryant 549C manual Electrical Data 549B, 81/2 Tons

ELECTRICAL DATA — 549B (cont)

549B036-120 STANDARD MOTOR UNITS WITHOUT ELECTRICAL CONVENIENCE OUTLET (cont)

	NOMINAL	VOLTAGE		COMPRESSOR			OFM									MINIMUM UNIT
UNIT								IFM	ELECTRIC HEAT*			POWER SUPPLY					DISCONNECT
	VOLTAGE	RANGE			(each)		(each)
549B																		SIZE
	(V-Ph-Hz)	Min	Max	RLA		LRA	FLA	FLA	kW†	FLA		MCA		MOCP		FLA		LRA
									—	—		38.2/ 38.2		40/ 40**		40/ 40		242/242
									7.8/10.4	21.7/	25.0	65.3/	69.5	70/	70**	65/	69	264/267
	208/230-3-60	187	254	12.4		88.0	1.4	7.5	12.0/16.0	33.3/	38.5	79.8/	86.3	80/	90	79/	85	275/281††
									18.6/24.8	51.6/	59.7	102.7/112.8		110/125		100/109		294/302††
090									24.0/32.0	66.6/	77.0	121.5/134.5		125/150		117/129		309/319††
									31.8/42.4	88.3/102.0		148.6/165.7		150/175		142/158		330/344††
(71/2 Tons)									—	—		19.2		20**		20		121
									13.9	16.7		40.1		45**		39		138
	460-3-60	414	508	6.4		44.0	0.7	3.4	16.5	19.8		44.0		45**		43		141
									27.8	33.4		61.0		70		59		155
									33.0	39.7		68.8		70		66		161
									41.7	50.2		82.0		90		78		171
									—	—		41.3/ 41.3		45/ 45**		43/43		276/276
									7.8/10.4	21.7/	25.0	68.4/	72.5	70/	80**	68/72		298/301
	208/230-3-60	187	254	13.9		105	1.4	7.5	12.0/16.0	33.3/	38.5	82.9/	89.4	90/	90	82/88		309/315††
									18.6/24.8	51.6/	59.7	105.8/115.9		110/125		103/112		328/336††
102									24.0/32.0	66.6/	77.0	124.5/137.5		125/150		120/132		343/353††
									31.8/42.4	88.3/102.0		151.7/168.8		175/175		145/161		364/378††
(81/2 Tons)									—	—		22.3		25**		23		143
									13.9	16.7		43.2		45**		43		160
	460-3-60	414	508	7.9		55.0	0.7	3.4	16.5	19.8		47.0		50**		46		163
									27.8	33.4		64.0		70		62		177
									33.0	39.7		71.9		80		69		183
									41.7	50.2		85.0		90		81		193
									—	—		56.8/ 56.8		60/ 60**		60/ 60		337/337
									7.8/10.4	21.7/	25.0	84.0/	88.1	90/	90	85/	89	358/362††
	208/230-3-60	187	254	19.3		123.0	1.4	10.6	12.0/16.0	33.3/	38.5	98.5/105.0		100/110		98/104		370/375††
									24.0/32.0	66.6/	77.0	140.1/153.1		150/175		136/148		403/414††
120									31.8/42.4	88.3/102.0		167.2/184.3		175/200		161/177		425/439††
									37.6/50.0	104.4/120.3		187.3/177.1		200/200		180/198		441/457††
(10 Tons)									—	—		28.7		30**		30		170
									16.5	19.8		53.5		60**		53		189
	460-3-60	414	508	10.0		62.0	0.7	4.8	27.8	33.4		70.5		80		69		203
									33.0	39.7		78.3		80		76		209
									41.7	50.2		91.5		100		88		220††
									50.0	60.1		88.8		100		99		230††

549B, 549C

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

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or 480 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

†Heaters are field installed only. **Fuse or HACR circuit breaker.

††Electrical disconnect cannot be used if electric heater is installed.

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.

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 percentage of voltage imbalance.

%Voltage Imbalance

= 100 x	max voltage deviation from average voltage
	average voltage

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 of voltage imbalance.

% Voltage Imbalance= 100 x	7
	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.

POWER EXHAUST ELECTRICAL DATA

POWER EXHAUST	MCA	MCA	MCA	MOCP
				(for separate
PART NO.	(230 v)	(460 v)	(575 v)
				power source)
CRPWREXH021A01	N/A	0.68	N/A	15
CRPWREXH022A01	3.4	N/A	1.32	15
CRPWREXH023A01	N/A	1.4	N/A	15
CRPWREXH028A01	1.7	N/A	0.68	15
CRPWREXH029A01	N/A	0.7	N/A	15
CRPWREXH030A01	1.6	N/A	0.64	15

N/A — Not available

NOTE: If a single power source is to be used, size wire to include power exhaust MCA and MOCP.

Check MCA and MOCP when power exhaust is powered through the unit. Deter- mine the new MCA including the power exhaust using the following formula: MCA New = MCA unit only + MCA of Power Exhaust

For example, using a 549B060 unit with MCA = 35.6 and MOCP = 40, with CRPWREXH030A01 power exhaust.

MCA New = 35.6 amps + 1.6 amps = 37.2 amps

If the new MCA does not exceed the published MOCP, then MOCP would not change. The MOCP in this example is 40 amps and the MCA New is below 40; therefore the MOCP is acceptable. If “MCA New” is larger than the published MOCP, raise the MOCP to the next larger size. In all cases, the MOCP for the power exhaust should be 15 amps per NEC.

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