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Table 3B — Electrical Data — Unit with Factory-Installed Motormaster® I Control
LEGEND
*Units are suitable for use on electrical systems where voltage sup-
plied to unit terminals is not below or above listed minimum and
maximum limits.
NOTE: Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to determine
the percent voltage imbalance.
Percent Voltage Imbalance
Example: Supply voltage is 240-3-60.
AB = 243 v
BC = 236 v
AC = 238 v
Determine maximum deviation from average voltage:
(AB) 243 – 239 = 4 v
(BC) 239 – 236 = 3 v
(AC) 239 – 238 = 1 v
Maximum deviation is 4 v. Determine percent voltage imbalance:
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
UNIT
SIZE
30GTN
UNIT CONTROL CIRCUIT
Voltage
V-Hz (3 Ph)
Supplied*
MCA MOCP ICF
Rec Fuse
Size
V-Hz
(Single Ph)
Supplied
MCA and
MOCP
Min Max Min Max
015
208/230-60 187 253 82.2 125 278.4 100 115-60 104 127 30
460-60 414 506 38.3 60 129.3 45 115-60 104 127 30
575-60 518 633 30.8 50 105.6 40 115-60 104 127 30
380-60 418 342 43.9 70 152.8 60 230-60 198 254 15
380/415-50 342 440 51.9 80 181.5 70 230-50 198 254 15
020
208/230-60 187 253 97.4 150 357.4 125 115-60 104 127 30
460-60 414 506 49.6 80 182.3 60 115-60 104 127 30
575-60 518 633 42.0 70 129.6 50 115-60 104 127 30
380-60 418 342 51.1 80 198.8 60 230-60 198 254 15
380/415-50 342 440 63.0 100 231.5 80 230-50 198 254 15
025
208/230-60 187 253 124.7 200 458.4 150 115-60 104 127 30
460-60 414 506 60.7 100 232.3 80 115-60 104 127 30
575-60 518 633 51.5 80 173.6 70 115-60 104 127 30
380-60 418 342 64.7 110 254.8 80 230-60 198 254 15
380/415-50 342 440 71.0 110 261.5 90 230-50 198 254 15
030
208/230-60 187 253 145.5 250 518.4 175 115-60 104 127 30
460-60 414 506 68.7 110 262.3 90 115-60 104 127 30
575-60 518 633 54.0 90 185.6 70 115-60 104 127 30
380-60 418 342 73.6 125 287.8 90 230-60 198 254 15
380/415-50 342 440 90.3 150 353.5 110 230-50 198 254 15
035
208/230-60 187 253 203.0 350 708.6 250 115-60 104 127 30
460-60 414 506 91.1 150 357.4 110 115-60 104 127 30
575-60 518 633 80.7 125 289.0 100 115-60 104 127 30
380-60 418 342 111.1 175 393.7 150 230-60 198 254 15
ICF —
Maximum Instantaneous Current Flow during starting
(the point in the starting sequence where the sum of
the LRA for the starting compressor, plus the total
RLA for all running compressors, plus the total FLA for
all running fan motors is maximum).
MCA —
Minimum Circuit Amps (complies with National Elec-
trical Code [NEC, U.S.A.], Section 430-24)
MOCP —
Maximum Overcurrent Protection
= 100 x
max voltage deviation from average voltage
average voltage
Average voltage =
243 + 236 + 238
3
= 239 v
% Voltage Imbalance = 100 x
4
239
= 1.7%
IMPORTANT: Contact your local electric utility company
immediately if the supply voltage phase imbalance is more
than 2%.