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APPENDIX IV. ELECTRICAL DATA (cont.)
MCA/MOCP DETERMINATION NO C.O. OR UNPWRD C.O.
UNIT
NOM.
V --- Ph --- Hz
IFM
TYPE
COMBUSTION
FAN MOTOR
FLA
POWER
EXHAUST
FLA
NO C.O. or UNPWRD C.O. NO C.O. or UNPWRD C.O.
NO P.E. w/ P.E. (pwrd fr/ unit)
MCA MOCP
DISC. SIZE
MCA MOCP
DISC. SIZE
FLA LRA FLA LRA
580J*08
208/230---3---60
STD
0.48 3.8
39.5 60 38 191 43.3 60 43 195
MED 41.8 60 41 228 45.6 60 45 232
HIGH 49.3 60 49 254 53.1 60 54 258
460 --- 3 --- 60
STD
0.25 1.8
19.5 30 19 113 21.3 30 21 115
MED 20.3 30 20 132 22.1 30 22 134
HIGH 24.3 30 24 145 26.1 30 26 147
575 --- 3 --- 60
STD
0.24 3.8
14.9 20 14 89 18.7 25 19 93
MED 15.3 20 15 104 19.1 25 19 108
HIGH 18.1 25 18 118 21.9 30 23 122
580J*09
208/230---3---60
STD
0.48 3.8
45.1 60 43 222 48.9 60 48 226
MED 45.1 60 43 233 48.9 60 48 237
HIGH 49.9 60 49 276 53.7 80 53 280
460 --- 3 --- 60
STD
0.25 1.8
22.6 30 22 108 24.4 30 24 110
MED 22.6 30 22 114 24.4 30 24 116
HIGH 24.4 30 24 136 26.2 30 26 138
575 --- 3 --- 60
STD
0.24 3.8
18.9 30 18 91 22.7 30 23 95
MED 18.5 30 18 95 22.3 30 22 99
HIGH 19.3 30 19 106 23.1 30 23 110
580J*12
208/230---3---60
STD
0.48 3.8
45.8 60 44 263 49.6 60 48 267
MED 50.6 60 50 306 54.4 80 54 310
HIGH 55.6 80 55 315 59.4 80 60 319
460 --- 3 --- 60
STD
0.25 1.8
25.1 30 24 133 26.9 40 26 135
MED 26.9 40 26 155 28.7 45 28 157
HIGH 29.9 45 30 159 31.7 45 32 161
575 --- 3 --- 60
STD
0.24 3.8
18.5 30 18 95 22.3 30 22 99
MED 19.3 30 19 106 23.1 30 23 110
HIGH 22.1 30 22 120 25.9 30 26 124
1
Fuse or breaker
LEGEND:
CO --- Convenient outlet
DISC --- Disconnect
FLA --- Full load amps
IFM --- Indoor fan motor
LRA --- Locked rotor amps
MCA --- Minimum circuit amps
MOCP --- Maximum over current protection
PE --- Power exhau st
UNPWRD CO --- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for multimotor and
combination load equipment (refer to NEC Articles 430 and
440), the overcurrent protective device for the unit shall be
fuse or HACR breaker. Canadian units may be fuse or circuit
breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to de-
termine the percentage of voltage imbalance.
% VoltageImbalance = 100x
max voltage deviation from average voltage
averagevoltage
Example: Supply voltage is 230- 3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
(224 +231 + 226)
=
681
3
3
= 227
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% VoltageImbalance = 100 x
4
227
= 1.76%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than
2%, contact your local electric utility company immediately.
580J