38
SCXF-SVX01T-EN
Selection Procedures
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 previous
formulas:
• 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 18. Number of compressors per unit
SCWF/SIWF 29 - 32 35 - 38 42 - 46 52 - 58 65 - 72 80 90 100 110
10 HP 1 3 2 - 1 - - 2 -
15 HP 1 - 1 3 3 4 5 4 6
Table 19. Compressor Electrical Data
SCWF/SIWF
200V 460V 575V
HP RLA LRA RLA LRA RLA LRA
10 41.4 267 18.6 142 15.8 103
15 56.9 351 25.5 197 23.1 146
Table 20. Fan motor electrical data
HP TYPE
200V 460V 575V
FLA LRA FLA LRA FLA LRA
5
OPD 15.3 109.0 6.6 48.0 5.2 40.0
TEFC 15.2 128.8 6.7 56.0 5.3 44.8
7.5
OPD 23.3 199.0 9.7 84.8 7.8 61.4
TEFC 22.1 164.0 9.6 70.9 7.7 56.9
10
OPD 29.5 260.0 12.6 118.0 10.1 72.3
TEFC 29.5 216.0 12.8 103.0 10.3 83.9
15
OPD 43.4 271.0 18.9 118.0 15.1 95.9
TEFC 42.5 288.0 18.5 125.0 15.0 102.0
20
OPD 57.0 350.0 24.5 156.0 19.6 126.0
TEFC 55.5 402.0 24.2 175.0 19.4 140.0
25
OPD 70.0 432.0 30.5 190.0 24.5 155.0
TEFC 71.0 523.0 30.5 188.0 24.5 140.0
30
OPD 82.2 514.0 36.6 252.0 29.0 200.0
TEFC 81.0 560.0 38.0 274.0 29.2 177.0
40
OPD 109.0 615.0 49.0 330.0 40.0 270.0
TEFC 111.0 758.0 47.4 320.0 38.0 280.0
Installation - Electrical
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