24
PKG-SVX029A-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%
Determine Minimum Circuit Ampacity
(MCA)
MCA = 1.25 x largest motor amps/VFD amps (FLA or RLA)
+ the sum of the remaining motor amps.
Determine Max Fuse (MFS) and Max Circuit
Breaker (MCB) Sizes
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 8. Electrical service sizing data — motors
Digit 9 - Unit
Voltage
Digit 9 Tonnage Comp 1 Comp 2 Comp 3 Comp 4
Fan FLA
Qty Fans
Misc MCA MOP
460/60/3 4 20 7.1 7.1 7.1 7.1 7.1 1.00 1.00 38 45
460/60/3 4 25 9.1 9.1 9.1 9.1 7.1 1.00 1.00 47 56
460/60/3 4 30 11.9 11.9 11.9 11.9 7.1 2.00 1.00 66 77
460/60/3 4 35 12.4 12.4 11.9 11.9 7.1 2.00 1.00 67 79
460/60/3 4 40 12.4 12.4 12.4 12.4 7.1 2.00 1.00 68 80
460/60/3 4 45 15.4 15.4 12.4 12.4 7.1 2.00 1.00 75 90
460/60/3 4 50 15.4 15.4 15.4 15.4 7.1 3.00 1.00 88 103
460/60/3 4 55 19.4 19.4 15.4 15.4 7.1 3.00 1.00 97 116
460/60/3 4 60 20.6 20.6 19.4 19.4 7.1 4.00 1.00 115 135
460/60/3 4 65 20.6 20.6 20.6 20.6 7.1 4.00 1.00 117 137
460/60/3 4 70 24.0 24.0 20.6 20.6 7.1 4.00 1.00 124 148
460/60/3 4 75 32.8 32.8 20.6 20.6 7.1 4.00 1.00 144 177
460/60/3 4 85 32.8 32.8 24.0 24.0 7.1 5.00 1.00 158 191
460/60/3 4 90 32.8 32.8 32.8 32.8 7.1 5.00 1.00 176 208
460/60/3 4 100 38.5 38.5 32.8 32.8 7.1 6.00 1.00 196 234
460/60/3 4 110 38.5 38.5 38.5 38.5 7.1 7.00 1.00 214 253
208-230/60/3 F 20 16.0 16.0 16.0 16.0 13.5 1.00 2.00 84 100
208-230/60/3 F 25 21.2 21.2 21.2 21.2 13.5 1.00 2.00 105 127
208-230/60/3 F 30 24.4 24.4 24.4 24.4 13.5 2.00 2.00 133 157
208-230/60/3 F 35 28.7 28.7 24.4 24.4 13.5 2.00 2.00 142 171
208-230/60/3 F 40 28.7 28.7 28.7 28.7 13.5 2.00 2.00 151 179
208-230/60/3 F 45 33.3 33.3 28.7 28.7 13.5 2.00 2.00 161 195
208-230/60/3 F 50 33.3 33.3 33.3 33.3 13.5 3.00 2.00 184 218
208-230/60/3 F 55 40.8 40.8 33.3 33.3 13.5 3.00 2.00 201 242
208-230/60/3 F 60 45.9 45.9 40.8 40.8 13.5 4.00 2.00 241 287
208-230/60/3 F 65 45.9 45.9 45.9 45.9 13.5 4.00 2.00 251 297
208-230/60/3 F 70 49.0 49.0 45.9 45.9 13.5 4.00 2.00 258 307
208-230/60/3 F 75 62.1 62.1 45.9 45.9 13.5 4.00 2.00 287 349
208-230/60/3 F 85 62.1 62.1 49.0 49.0 13.5 5.00 2.00 307 369
208-230/60/3 F 90 62.1 62.1 62.1 62.1 13.5 5.00 2.00 333 395
Installation - Electrical
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