Bryant 549C manual Power Exhaust MCA Mocp

ELECTRICAL DATA — 548F (cont)

548F036-120 (UNITS WITH ELECTRICAL CONVENIENCE OUTLET) (cont)

				VOLTAGE		COMPRESSOR						ELECTRIC			POWER SUPPLY		DISCONNECT
	UNIT	NOMINAL	IFM	RANGE			(each)		OFM	IFM			HEAT*					SIZE†
	548F	V-PH-Hz	TYPE	Min	Max	RLA		LRA	FLA	FLA	Nominal			FLA	MCA	MOCP	FLA		LRA
											kW**
											—			—	25.5	30††	27		145
											16.5			19.8	50.3	60††	50		165
			STD	414	508	8.6		59.6	0.7	2.6	27.8			33.4	67.3	70	65		178
											33.0			39.7	75.2	80	73		185
											41.7			50.2	88.3	90	85		195***
											50.0			60.1	85.6	90	96		205***
											—			—	26.3	30††	28		185
											16.5			19.8	51.1	60††	51		204
		460-3-60	ALT	414	508	8.6		59.6	0.7	3.4	27.8			33.4	68.1	70	66		218
548F											33.0			39.7	76.0	80	73		224
											41.7			50.2	89.1	90	86		235***
											50.0			60.1	86.4	90	97		245***
											—			—	30.3	35††	32		179
											16.5			19.8	55.1	60††	55		198
	120		HIGH-STATIC	414	508	8.6		59.6	0.7	7.4	27.8			33.4	72.1	80	71		212
	(10 Tons)										33.0			39.7	80.0	80	78		218
											41.7			50.2	93.1	100	90		229***
											50.0			60.1	90.4	100	102		239***
											—			—	20.5	25††	22		120
			STD	518	632	6.9		49.4	0.7	2.6	17.0			17.1	41.8	45††	41		137
											34.0			34.1	63.1	70	61		154
											51.0			51.2	71.7	80	80		171***
											—			—	21.1	25††	22		151
		575-3-60	ALT	518	632	6.9		49.4	0.7	3.4	17.0			17.1	42.5	45††	42		168
											34.0			34.1	63.7	70	62		185
											51.0			51.2	72.3	80	81		202***
											—			—	24.3	25††	26		146
			HIGH-STATIC	518	632	6.9		49.4	0.7	7.4	17.0			17.1	45.7	50††	46		163
											34.0			34.1	66.9	70	65		180
											51.0			51.2	75.5	80	85		198***

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

*Heaters are field installed only.

†Used to determine minimum disconnect size per NEC.

**Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v, and 575 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

††Fuse or HACR circuit breaker.

***Optional disconnect switch is unavailable.

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 percent 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%, contact 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. Determine the new MCA including the power exhaust using the following formula:

MCA New = MCA unit only + MCA of Power Exhaust

For example, using a 548F060 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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