Selection Procedures

Electrical Requirements

RLA = rated load amps

Compressor LRA = locked rotor amps Fan motor LRA = locked rotor amps, N.E.C. table 430 - 150

FLA = full load amps, N.E.C. Table 430 - 150

Voltage utilization range is ±10%

Determination of minimum circuit ampacity (MCA).

MCA = 1.25 x largest motor amps/VFD amps (FLA or RLA) + the sum of the remaining motor amps.

Determination of maximum fuse size (MFS) and maximum circuit breaker size (MCB).

MFS and MCB = 2.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.

For units with the dual power option, there are two electrical circuits that need calculations using the formulas above: circuit #1 - fans

circuit #2 - compressors

If the rating value determined does not equal a standard current rating of over current protective device, use the next lower standard rating for the marked maximum rating.

Table ED-1. Number of Compressors per Unit

SCWG/SIWG 20		25	30	35
SCRG/SIRG	20		25	32
10 HP	2	2	1	-
15 HP	-	-	1	2

Table ED-2. SCWG/SIWG Compressor Motor Data

	200V			460V		575V
HP	RLA	LRA	RLA	LRA	RLA	LRA
10	33.1	269	14.4	117	11.5	94
15	46.9	409	20.4	178	16.4	143

Table ED-3. SCRG/SIRG Compressor Motor Data

	200V			460V		575V
HP	RLA	LRA	RLA	LRA	RLA	LRA
10	38.4	269	16.7	117	13.4	94
15	55.0	409	24.1	178	19.1	143

Table ED-4. Fan without VFD

HP	FLA	200V	FLA	460V	FLA	575V
HP	FLA	LRA	FLA	LRA	FLA	LRA
5	16.1	105	6.7	46	5.4	37
7.5	25.0	152	10.8	66	8.2	54
10	32.9	193	14.2	84	11.4	66
15	44.8	290	20.3	126	16.2	102
20	61.0	373	25.0	162	20.0	132
25	74.0	469	31.0	204	24.2	162

Table ED-5. Fan with VFD

		200V		460V
HP	FLA	LRA	FLA	LRA
7.5	13.8	152	10.6	66
10	32.2	193	14.2	84
15	48.3	290	21.0	126
20	61.9	373	27.6	162
25	78.2	469	34.0	204

Note:Values are at the maximumVFD input rating and not the reduced motor values.

Table ED-6. Electric Heat - Single Stage

SCWG/SIWG	SCRG/SIRG	Heat	200V	460V
Size	Size	Kw	Amps	Amps
20	20	16	44.8	19.6
25	25	20	55.6	24.2
30	-	24	66.8	29.0
-	32	26	72.4	31.6
35	-	28	78	34.0

Note: Electric heat amperage should not be considered when determining minimum circuit ampacity. The current of the unit in the heating mode will not exceed the current of the unit in the cooling mode.

Table ED-7. CCRC/CIRC Condenser Electrical Data

Unit Size	Rated					MFS/
Tons	Voltage	# Fans	FLA (ea.)	LRA (ea.)	MCA	MCB
20, 29, 32	200	4	4.1	20.7	17.4	20
	230	4	4.1	20.7	17.4	20
	460	4	1.8	9.0	7.7	15
	575	4	1.4	7.2	6.0	15

Note: All motors for CCRC/CIRC units are rated at 1 hp (.7457 kW).

34	SCXG-SVX01B-EN

SCXG-SVX01B-EN specifications

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