Bryant LEGACY 558J Product Data page 41

Table 37 – MCA/MOCP DETERMINATION W/ PWRD C.O.
ELECTRIC HEATER
IFM
TYPE
kW
---
4.9/6.5
6.5/8.7
STD
9.8/13.0
13.1/17.4
15.8/21.0
---
4.9/6.5
6.5/8.7
MED
9.8/13.0
13.1/17.4
15.8/21.0
---
4.9/6.5
7.9/10.5
STD
12.0/16.0
15.8/21.0
19.9/26.5
---
4.9/6.5
7.9/10.5
MED
12.0/16.0
15.8/21.0
19.9/26.5
---
4.9/6.5
7.9/10.5
HIGH
12.0/16.0
15.8/21.0
19.9/26.5
---
6.0
11.5
STD
14.0
23.0
25.5
---
6.0
11.5
MED
14.0
23.0
25.5
---
6.0
11.5
HIGH
14.0
23.0
25.5
STD ---
MED ---
HIGH ---
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
PE --- Power exhaust
UNPWRD CO --- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for multimotor and combina-
tion 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.
max voltage deviation from average voltage
% Voltage Imbalance = 100 x
FLA
MCA MOCP
--- 44.0 60
23.5/27.1 44.0/46.0 60/60
31.4/36.3 51.4/57.5 60/60
46.9/54.2 70.8/79.9 80/80
62.8/72.5 90.6/102.8 100/110
75.8/87.5 106.9/121.5 110/125
--- 46.1 60
23.5/27.1 46.1/48.6 60/60
31.4/36.3 54.0/60.1 60/70
46.9/54.2 73.4/82.5 80/90
62.8/72.5 93.3/105.4 100/110
75.8/87.5 109.5/124.1 110/125
--- 30.7 45
13.6/15.6 30.7/31.6 45/45
21.9/25.3 39.5/43.8 45/45
33.4/38.5 53.9/60.3 60/70
43.8/50.5 66.9/75.3 70/80
55.2/63.8 81.1/91.9 90/100
--- 31.0 45
13.6/15.6 31.0/32.0 45/45
21.9/25.3 39.9/44.1 45/45
33.4/38.5 54.3/60.6 60/70
43.8/50.5 67.3/75.6 70/80
55.2/63.8 81.5/92.3 90/100
--- 33.3 45
13.6/15.6 33.3/34.9 45/45
21.9/25.3 42.8/47.0 45/50
33.4/38.5 57.1/63.5 60/70
43.8/50.5 70.1/78.5 80/80
55.2/63.8 84.4/95.1 90/100
--- 14.7 20
7.2 14.7 20
13.8 22.6 25
16.8 26.4 30
27.7 40.0 45
30.7 43.8 45
--- 15.2 20
7.2 15.2 20
13.8 23.3 25
16.8 27.0 30
27.7 40.6 45
30.7 44.4 45
--- 16.0 20
7.2 16.0 20
13.8 24.3 25
16.8 28.0 30
27.7 41.6 45
30.7 45.4 50
--- 11.5 15
--- 12.4 15
--- 12.4 15
average voltage
w/ PWRD C.O.
NO P .E.
DISC. SIZE
FLA LRA
43 155
43/43 155/155
47/53 155/155
65/73 155/155
83/95 155/155 93.0/105.1
98/112 155/155 109.3/123.9
45 180
45/45 180/180
50/55 180/180
68/76 180/180
86/97 180/180 95.6/107.8
101/114 180/180 111.9/126.5
31 131
31/31 131/131
36/40 131/131
50/55 131/131
62/69 131/131
75/85 131/131
31 149
31/31 149/149
37/41 149/149
50/56 149/149
62/70 149/149
75/85 149/149
34 175
34/34 175/175
39/43 175/175
53/58 175/175
65/72 175/175
78/88 175/175
15 62
15 62
21 62
24 62
37 62
40 62
15 71
15 71
21 71
25 71
37 71
41 71
16 84
16 84
22 84
26 84
38 84
42 84
12 48
13 65
13 65
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
=
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v
(BC) 231 – 227 = 4 v
% 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%, con-
tact your local electric utility company immediately.
41
w/ P .E. (pwrd fr/unit)
DISC. SIZE
MCA MOCP
FLA
45.9 60 45
45.9/48.4 60/60 45/45
53.8/59.9 60/60 49/55
73.1/82.3 80/90 67/76
100/110 86/97
110/125 101/114
48.0 60 48
48.0/51.0 60/60 48/48
56.4/62.5 60/70 52/58
75.8/84.9 80/90 70/78
100/110 88/99
125/150 103/116
32.6 45 33
32.6/34.0 45/45 33/33
41.9/46.1 45/50 39/42
56.3/62.6 60/70 52/58
69.3/77.6 70/80 64/71
83.5/94.3 90/100 77/87
32.9 45 33
32.9/34.4 45/45 33/33
42.3/46.5 45/50 39/43
56.6/63.0 60/70 52/58
69.6/78.0 70/80 64/72
83.9/94.6 90/100 77/87
35.2 50 36
35.2/37.3 50/50 36/36
45.1/49.4 50/50 42/45
59.5/65.9 60/70 55/61
72.5/80.9 80/90 67/74
86.8/97.5 90/100 80/90
15.7 20 16
15.7 20 16
23.9 25 22
27.6 30 25
41.3 45 38
45.0 50 41
16.2 20 16
16.3 20 16
24.5 25 23
28.3 30 26
41.9 45 39
45.6 50 42
17.0 20 17
17.3 20 17
25.5 30 23
29.3 30 27
42.9 45 39
46.6 50 43
13.4 15 14
14.3 20 15
14.3 20 15
(224 + 231 + 226)
=
3
227
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
4
= 100 x
227
= 1.76%
LRA
157
157/157
157/157
157/157
157/157
157/157
182
182/182
182/182
182/182
182/182
182/182
133
133/133
133/133
133/133
133/133
133/133
151
151/151
151/151
151/151
151/151
151/151
177
177/177
177/177
177/177
177/177
177/177
63
63
63
63
63
63
72
72
72
72
72
72
85
85
85
85
85
85
50
67
67
681
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