Carrier 48TC**16 User Manual
Page 45
45
Table 10 – Unit Wire/Fuse or HACR Breaker Sizing Data
UN
IT
NOM.
V---Ph---Hz
IFM
TYPE
COMBUSTION
FAN MOTOR
POWER
EXHAUST
NO C.O. or UNPWR C.O.
FLA
FLA
NO P.E.
w/ P.E. (pwrd fr/ unit)
MCA
FUSE
or
HACR
BRKR
DISC. SIZE
MCA
FUSE
or
HACR
BRKR
DISC. SIZE
FLA
LRA
FLA
LRA
48TC*
D
16
208/230---3---60
STD
0.48
3.8
68.3
80
71
396
72.1
80
76
400
MED
70.8
80
74
413
74.6
90
79
417
HIGH
81.2
100
86
432
85.0
100
91
436
460---3---60
STD
0.25
1.8
34
45
35
234
35.8
45
37
236
MED
35.0
45
37
243
36.8
45
39
245
HIGH
40.8
50
43
252
42.6
50
45
254
575---3---60
STD
0.24
3.8
26.5
30
28
184
30.3
40
32
188
MED
26.5
30
28
184
30.3
40
32
188
HIGH
32.7
40
35
196
36.5
45
39
200
Table 10 — Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
UN
IT
NOM.
V---Ph---Hz
IFM
TYPE
COMBUSTION
FAN MOTOR
POWER
EXHAUST
w/ PWRD C.O.
FLA
FLA
NO P.E.
w/ P.E. (pwrd fr/ unit)
MCA
FUSE
or
HACR
BRKR
DISC. SIZE
MCA
FUSE
or
HACR
BRKR
DISC. SIZE
FLA
LRA
FLA
LRA
48TC*
D
16
208/230---3---60
STD
0.48
3.8
73.1
80
77
401
76.9
100
81
405
MED
75.6
100
80
418
79.4
100
84
422
HIGH
86.0
100
92
437
89.8
100
96
441
460---3---60
STD
0.25
1.8
36.2
45
38
236
38
50
40
238
MED
37.2
50
39
245
39.0
50
41
247
HIGH
43.0
50
46
254
44.8
50
48
256
575---3---60
STD
0.24
3.8
28.2
35
30
186
32
40
34
190
MED
28.2
35
30
186
32
40
34
190
HIGH
34.4
40
37
198
38.2
45
41
202
Legend and Notes for Table 10
LEGEND:
BRKR
--- Circuit breaker
CO
--- Convenience outlet
DISC
--- Disconnect
FLA
--- Full load amps
IFM
--- Indoor fan motor
LRA
--- Locked rotor amps
MCA
--- Minimum circuit amps
P.E.
--- Power exhaust
PWRD CO
--- Powered convenient outlet
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
**16