Unit installation

Installation - Electrical
38 SCXF-SVX01K-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 formulas
above:
• circuit #1 - fans
• circuit #2 - compressors
If the rating value determined does not equal a standard
cur
rent rating of over current protective device, use the
next lower standard rating for the marked maximum
rating.
Table 26. Number of compressors per unit
SCRF/SIRF 20 25 - 29 30 - 35 40 50 60
SCWF/SIWF 20 - 25 29 - 32 35 - 38 42 - 46 52 - 58 65 - 72 80 90 100 110
10 2 1 3 2 - 1 - - 2 -
15 - 1 - 1 3 3 4 5 4 6
Table 27. Compressor Electrical Data
SCWF/SIWF SCRF/SIRF
200V 460V 575V 200V 460V 575V
HP RLA LRA RLA LRA RLA LRA HP RLA LRA RLA LRA RLA LRA
10 41.4 267 18.6 142 15.8 103 10 41.4 267 18.6 142 15.8 103
15 56.9 351 25.5 197 23.1 146 15 56.9 351 25.5 197 23.1 146
Table 28. Fan motor electrical data
200V 460V 575V
HP TYPE FLA LRA FLA LRA FLA LRA
5
OPD 15.7 107 6.7 48 5.4 40
TEFC 15.0 125 6.7 52 5.3 41
7.5
OPD 22.3 199 9.7 84.8 7.8 61.4
TEFC 23.2 162 9.4 74 7.6 58.5
10
OPD 29.5 260 12.6 118 10.1 72.3
TEFC 27.4 195 11.9 103 9.6 83.9
15
OPD 43.4 271 18.9 118 15.1 94
TEFC 42.5 235 18.5 122.9 14.8 99
20
OPD 57.0 373 24.5 160.8 19.6 130
TEFC 56.4 320 24.5 175 19.6 140
25
OPD 70.0 438 30.5 180 24.5 155
TEFC 69.0 385 30 200 23.9 153
30
OPD 82.2 514 36.6 223.6 28.5 179
TEFC 82.8 566 37.6 274 28.8 210
40
OPD 111.6 740 48.5 302 38.0 250
TEFC 106 734 47.4 320 38.0 280
50
ODP N/A N/A 60.5 380 47.0 305
TEFC N/A N/A 59.0 455 47.2 380
60 ODP N/A N/A 71.0 470 N/A N/A