49
Table 46 – MCA/MOCP DETERMINATION WITHOUT C.O. OR UNPWRD C.O.
UNIT
NOM. V --- PH --- HZ
IFM
TYPE
ELEC. HTR WITHOUT C.O. or UNPWR C.O.
Nom
(kW)
FLA
WITHOUT P.E. WITH P.E.
MCA MOCP
DISC. SIZE
MCA MOCP
DISC. SIZE
FLA LRA FLA LRA
548J*04
208/230---1---60
DD --- STD
--- --- 30.7 45 30 121 32.6 50 32 123
3.3/4.4 15.9/18.3 50.6/53.6 60/60 48/51 137/139 52.5/55.5 60/60 51/53 139/141
4.9/6.5 23.5/27.1 60.1/64.6 70/70 57/61 145/148 62.0/66.5 70/70 59/63 147/150
6.5/8.7 31.4/36.3 69.9/76.1 70/80 66/72 152/157 71.8/78.0 80/80 68/74 154/159
7.9/10.5 37.9/43.8 78.1/85.4 80/90 74/ 81 159/165 80.0/87.3 80/90 76/83 161/167
9.8/13.0 46.9/54.2 89.3/98.4 90/100 84/92 215/229 91.2/100.3 100/110 86/95 217/231
208/230---3---60
DD --- STD
--- --- 24.8 30 25 97 26.7 30 27 99
3.3/4.4 9.2/10.6 36.3/38.1 45/45 35/37 106/108 38.2/40.0 45/50 37/39 108/110
4.9/6.5 13.6/15.6 41.8/44.3 50/50 40/43 111/113 43.7/46.2 50/50 43/45 113/115
6.5/8.7 18.1/20.9 47.4/50.9 50/60 46/49 115/118 49.3/52.8 50/60 48/51 117/120
7.9/10.5 21.9/25.3 52.2/56.4 60/60 50/ 54 119/122 54.1/58.3 60/60 52/56 121/124
12.0/16.0 33.4/38.5 66.6/72.9 70/80 63/69 130/136 68.5/74.8 70/80 65/71 132/138
MED
--- --- 22.6 30 22 109 24.5 30 24 111
3.3/4.4 9.2/10.6 34.1/35.9 45/45 33/34 118/120 36.0/37.8 45/45 35/37 120/122
4.9/6.5 13.6/15.6 39.6/42.1 45/50 38/40 123/125 41.5/44.0 50/50 40/42 125/127
6.5/8.7 18.1/20.9 45.2/48.7 50/50 43/46 127/130 47.1/50.6 50/60 45/48 129/132
7.9/10.5 21.9/25.3 50.0/54.2 50/60 47/ 51 131/134 51.9/56.1 60/60 50/53 133/136
12.0/16.0 33.4/38.5 64.4/70.7 70/80 61/66 142/148 66.3/72.6 70/80 63/69 144/150
HIGH
--- --- 22.6 30 22 120 24.5 30 24 122
3.3/4.4 9.2/10.6 34.1/35.9 45/45 33/34 129/131 36.0/37.8 45/45 35/37 131/133
4.9/6.5 13.6/15.6 39.6/42.1 45/50 38/40 134/136 41.5/44.0 50/50 40/42 136/138
6.5/8.7 18.1/20.9 45.2/48.7 50/50 43/46 138/141 47.1/50.6 50/60 45/48 140/143
7.9/10.5 21.9/25.3 50.0/54.2 50/60 47/ 51 142/145 51.9/56.1 60/60 50/53 144/147
12.0/16.0 33.4/38.5 64.4/70.7 70/80 61/66 153/159 66.3/72.6 70/80 63/69 155/161
46 0 --- 3 --- 60
DD --- STD
--- --- 16.0 20 16 53 17.0 20 17 54
6.0 7.2 25.0 30 24 60 26.0 30 26 61
8.8 10.6 29.3 30 28 64 30.3 35 30 65
11.5 13.8 33.3 35 32 67 34.3 35 33 68
14.0 16.8 37.0 40 36 70 38.0 40 37 71
MED
--- --- 10.6 15 10 54 11.6 15 12 55
6.0 7.2 19.6 20 19 61 20.6 25 20 62
8.8 10.6 23.9 25 23 65 24.9 25 24 66
11.5 13.8 27.9 30 26 68 28.9 30 27 69
14.0 16.8 31.6 35 30 71 32.6 35 31 72
HIGH
--- --- 10.6 15 10 60 11.6 15 12 61
6.0 7.2 19.6 20 19 67 20.6 25 20 68
8.8 10.6 23.9 25 23 71 24.9 25 24 72
11.5 13.8 27.9 30 26 74 28.9 30 27 75
14.0 16.8 31.6 35 30 77 32.6 35 31 78
75 --- 3 --- 60
DD --- STD --- --- 5.4 15 5 5 7.4 15 7 7
MED --- --- 3.4 15 3 8 5.4 15 5 10
HIGH --- --- 2.9 15 3 12 4.9 15 5 14
LEGEND
C.O. --- Convenient outlet
DD --- Electric Drive X13 Motor
DISC --- Disconnect
FLA --- Full load amps
IFM --- Indoor fan motor
LRA --- Locked rotor amps
MCA --- Minimum circuit amps
MOCP --- Maximum over current protection
P.E. --- Power exhaust
UNPWRD C.O. --- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for multimotor and
combination load equipment ( refer to NEC Articles 4 30 and
440), the overcurrent protec tive device for the unit shall be
fuse or HACR breaker. Canadian units may be fuse or cir-
cuit 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 =100 x
max voltage deviationfrom average voltage
averagevoltage
Example: Supply voltage is 230-3-60
AB = 224V
BC = 231V
AC = 226V
Average Voltage =
(224 +231 + 226)
=
681
3
3
= 227
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3V Maximum deviation is 4V.
(BC) 231 – 227 = 4V 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.
548J
