Bryant Legacy Line Series Manual page 43

NOM.
IFM TYPE
V-PH-HZ
MCA
DD-STD
208/230-
MED
1-60
HIGH
DD-STD
208/230-
MED 20/19
3-60
HIGH 23/23
DD-STD
460-3-60 MED
HIGH
DD-STD
575-3-60 MED
HIGH
DD-STD
208/230-
MED
1-60
HIGH
DD-STD
208/230-
MED 24/24
3-60
HIGH 27/27
DD-STD
460-3-60 MED
HIGH
DD-STD
575-3-60 MED
HIGH
DD-STD
208/230-
1-60
MED
DD-STD
208/230-
MED 30/30
3-60
HIGH 30/30
DD-STD
460-3-60 MED
HIGH
DD-STD
575-3-60 MED
HIGH
LEGEND
BRKR – Circuit Breaker
CO – Convenience Outlet
DD – Direct Drive (indoor fan motor)
DISC – Disconnect
FLA – Full Load Amps
IFM – Indoor Fan Motor
LRA – Locked Rotor Amps
MCA – Minimum Circuit Amps
MOCP – MAX FUSE or HACR Breaker
PE – Power Exhaust
PWR CO – Powered Convenience Outlet
UNPWR CO – Unpowered Convenience Outlet
NOTES:
1. In compliance with NEC requirements for multi-motor and combination
load equipment (refer to NEC Articles 430 and 440), the overcurrent pro-
tective 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.
UNIT WIRE/FUSE OR HACR BREAKER SIZING DATA
NO C.O. OR UNPWR C.O.
NO P.E. W/ P.E. (PWRD FR/ UNIT)
MAX DISC. SIZE
FUSE
OR MCA
FLA LRA
HACR
BRKR
30 45 29 88
27 40 26 93
29 45 28 118
22 30 22 82
25/25 19/19 111 22/21
30/30 23/23 147 25/25
12 15 12 43
11 15 10 57
12 15 12 75
10 15 10 42
7 15 7 45
9 15 8 60
37 50 35 128
34 50 32 133
36 50 35 158
26 30 26 94
30/30 23/23 123 26/26
40/40 27/27 159 29/29
13 15 13 47
12 15 11 61
13 15 13 79
11 15 11 39
9 15 8 42
10 15 9 57
41 60 39 144
40 60 38 174
29 40 28 120
45/45 30/29 185 32/32
45/45 30/29 185 32/32
14 20 14 58
14 20 14 90
14 20 14 90
12 15 12 46
11 15 10 64
11 15 10 64
MAX DISC SIZE
FUSE
OR MCA
FLA LRA
HACR
BRKR
32 45 31 90
29 45 28 95
31 45 30 120
24 30 24 84
30/30 21/21 113 24/24
30/30 25/25 149 28/28
13 15 13 44
12 15 11 58
13 15 13 76
12 15 12 44
9 15 9 47
10 15 10 62
39 50 37 130
36 50 35 135
38 50 37 160
28 40 28 96
30/30 26/25 125 29/29
40/40 29/29 161 32/32
14 20 14 48
13 15 12 62
14 20 14 80
13 15 13 41
11 15 10 44
12 15 12 59
42 60 41 146
42 60 41 176
31 45 31 122
45/45 32/32 187 35/35
45/45 32/32 187 35/35
15 20 15 59
15 20 15 91
15 20 15 91
14 15 14 48
12 15 12 66
12 15 12 66
Example: Supply voltage is 230-3-60
Average Voltage
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.
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.
Check all factory and field electrical connections for tightness.
W/ PWRD C.O.
NO P.E. W/ P.E. (PWRD FR/ UNIT)
MAX DISC SIZE
FUSE
OR MCA
FLA LRA
HACR
BRKR
34 50 34 93
32 45 31 98
34 50 34 123
27 30 27 87
30/30 25/24 116 26/26
30/30 28/28 152 30/29
14 20 14 45
13 15 13 59
15 20 15 77
11 15 12 44
9 15 9 47
10 15 10 62
41 60 41 133
39 60 38 138
41 60 40 163
31 40 32 99
40/40 29/29 128 31/31
45/45 33/33 164 34/34
15 20 15 49
14 15 13 63
15 20 15 81
13 15 13 41
10 15 10 44
12 15 11 59
45 60 44 149
45 60 44 179
34 45 34 125
50/50 35/35 190 37/37
50/50 35/35 190 37/37
16 20 16 60
17 20 16 92
17 20 16 92
13 15 13 48
12 15 12 66
12 15 12 66
AB = 224 v
A B C
BC = 231 v
AC = 226 v
MOTOR
(224 + 231 + 226)
=
3
% Voltage Imbalance = 100x
227
MAX DISC SIZE
FUSE
OR
FLA LRA
HACR
BRKR
36 50 36 95
34 45 34 100
36 50 36 125
29 35 29 89
30/30 27/26 118
35/35 30/30 154
15 20 16 46
14 15 14 60
16 20 16 78
13 15 14 46
11 15 11 49
12 15 12 64
43 60 43 135
41 60 40 140
43 60 43 165
33 45 34 101
40/40 31/31 130
45/45 35/35 166
16 20 16 50
15 20 15 64
16 20 17 82
15 20 15 43
12 15 12 46
13 15 14 61
47 60 47 151
47 60 46 181
36 50 36 127
50/50 37/37 192
50/50 37/37 192
17 20 17 61
18 20 18 93
18 20 18 93
15 20 16 50
14 15 14 68
14 15 14 68
681
= = 227
3
4
= 1.78%
43