Carrier 48TC*D08 - MCA;MOCP DETERMINATION

95
MCA/MOCP DETERMINATION NO C.O. OR UNPWRD C.O.
UNIT
NOM.
V --- P h --- H z
IFM
TYPE
COMBUSTION
FAN MOTOR
FLA
POWER
EXHAUST
FLA
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
48TC*D08
208/230---3--- 60
STD
0.48 3.8
43.6 50 46 198 47.4 60 51 202
MED 45.9 50 49 235 49.7 60 53 239
HIGH 53.8 60 58 261 57.6 70 62 265
4 6 0 --- 3 --- 6 0
STD
0.25 1.8
20.1 25 21 97 21.9 25 23 99
MED 20.9 25 22 116 22.7 25 24 118
HIGH 25.3 30 27 129 27.1 30 29 131
5 7 5 --- 3 --- 6 0
STD
0.24 3.8
14.8 20 16 79 18.6 20 20 83
MED 15.2 20 16 94 19.0 25 21 98
HIGH 18.3 20 19 108 22.1 25 24 112
48TC*D12
208/230---3--- 60
STD
0.48 3.8
48.5 60 51 263 52.3 60 56 267
MED 53.3 60 57 306 57.1 70 61 310
HIGH 58.3 70 62 315 62.1 70 67 319
4 6 0 --- 3 --- 6 0
STD
0.25 1.8
23.7 30 25 125 25.5 30 27 127
MED 25.5 30 27 147 27.3 30 29 149
HIGH 28.5 35 31 151 30.3 35 33 153
5 7 5 --- 3 --- 6 0
STD
0.24 3.8
17.9 20 19 95 21.7 25 23 99
MED 18.7 25 20 106 22.5 25 24 110
HIGH 21.5 25 23 120 25.3 30 27 124
48TC*D14
208/230---3--- 60
STD
0.48 3.8
65.5 80 69 365 69.3 80 73 369
MED 68.0 80 72 382 71.8 80 76 386
HIGH Model not available due to high amperage draw.
4 6 0 --- 3 --- 6 0
STD
0.25 1.8
31.7 40 33 183 33.5 40 35 185
MED 32.7 40 35 192 34.5 45 37 194
HIGH 35.7 45 38 196 37.5 45 40 198
5 7 5 --- 3 --- 6 0
STD
0.24 3.8
24.0 30 25 144 27.8 30 30 148
MED 24.0 30 25 144 27.8 30 30 148
HIGH 26.8 30 29 158 30.6 35 33 162
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
P E --- P o w e r e x h a u s t
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
determine the percentage of voltage imbalance.
% Voltage Imbalance = 100 x
max voltage deviation from a verage voltage
average voltage
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average V oltage =
(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.
% Voltage Imbalance = 100 x
4
227
= 1.76%
This amount of ph ase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supp ly voltage ph ase imbalance is more than
2%, contact your local electric utility company immediately.
48TC