69
Table 56 – MCA/MOCP DETERMINATION WITHOUT C.O. OR UNPWRD C.O.
UNIT
N O M . V --- P H --- H Z
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
50TCQA04
208/230---1---60
D D --- S T D
--- --- 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
D D --- S T D
--- --- 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
4 6 0 --- 3 --- 6 0
D D --- S T D
--- --- 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
7 5 --- 3 --- 6 0
D D --- S T D --- --- 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. --- C onvenience 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 . --- P o w e r e x h a u s t
UNPWRD C.O. --- Unpowered Convenience 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 b e 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 d e-
termine the percentage of voltage imbalance.
% Volta ge Imbalance = 100 x
max voltage deviation from average voltage
average voltage
Example: Supply voltage is 230-3-60
AB = 224V
BC = 231V
C = 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 D etermine percent of voltage imbalance.
% Volta ge Imbalance = 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 p hase imbalance is more than
2%, contact your local electric utility company immediately.
50TCQ
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