Carrier 48TC - Page 15

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Table 2 – Unit Wire/MOCP Sizing Data
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**04
208/230---1---60
STD
0.48 1.9
27.6 40.0 27 97 29.5 45.0 29 99
MED 27.6 40.0 27 97 29.5 45.0 29 99
208/230---3---60
STD
0.48 1.9
19.9 30.0 20 91 21.8 30.0 22 93
MED 19.9 30.0 20 91 21.8 30.0 22 93
HIGH 20.2 30.0 20 109 22.1 30.0 22 111
4 6 0 --- 3 --- 6 0
STD
0.25 1.0
10.4 15.0 10 47 11.4 15.0 11 48
MED 10.4 15.0 10 47 11.4 15.0 11 48
HIGH 10.9 15.0 11 56 11.9 15.0 12 57
5 7 5 --- 3 --- 6 0
STD
0.24 1.9
7.5 15.0 8 45 9.4 15.0 10 47
MED 7.5 15.0 8 45 9.4 15.0 10 47
HIGH 7.6 15.0 8 51 9.5 15.0 10 53
48TC**05
208/230---1---60
STD
0.48 1.9
34.1 50.0 33 135 36.0 50.0 35 137
MED 34.1 50.0 33 135 36.0 50.0 35 137
208/230---3---60
STD
0.48 1.9
24.0 30.0 24 101 25.9 30.0 26 103
MED 24.0 30.0 24 101 25.9 30.0 26 103
HIGH 24.3 30.0 24 119 26.2 30.0 26 121
4 6 0 --- 3 --- 6 0
STD
0.25 1.0
10.9 15.0 11 50 11.9 15.0 12 51
MED 10.9 15.0 11 50 11.9 15.0 12 51
HIGH 11.4 15.0 11 59 12.4 15.0 12 60
5 7 5 --- 3 --- 6 0
STD
0.24 1.9
7.5 15.0 8 45 9.4 15.0 10 47
MED 7.5 15.0 8 45 9.4 15.0 10 47
HIGH 7.6 15.0 8 51 9.5 15.0 10 53
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
P E --- P o w e r e x h a u s t
UNPWR 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.
% Voltage Imbalance = 100 x
max voltage deviation from average voltage
average voltage
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.
% Voltage 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 phase imbalance is more than
2%, contact your local electric utility company immediately.
48TC