Table 37 – mca/mocp determination w/ pwrd c.o – Bryant LEGACY 558J User Manual
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Table 37 – MCA/MOCP DETERMINATION W/ PWRD C.O.
UN
IT
V
---
P
H
---
H
Z
IFM
TYPE
ELECTRIC HEATER
w/ PWRD C.O.
kW
FLA
NO P.E.
w/ P.E. (pwrd fr/unit)
MCA
MOCP
DISC. SIZE
MCA
MOCP
DISC. SIZE
FLA
LRA
FLA
LRA
558J
*0
5
208/
230
---
1
---
60
STD
---
---
44.0
60
43
155
45.9
60
45
157
4.9/6.5
23.5/27.1
44.0/46.0
60/60
43/43
155/155
45.9/48.4
60/60
45/45
157/157
6.5/8.7
31.4/36.3
51.4/57.5
60/60
47/53
155/155
53.8/59.9
60/60
49/55
157/157
9.8/13.0
46.9/54.2
70.8/79.9
80/80
65/73
155/155
73.1/82.3
80/90
67/76
157/157
13.1/17.4
62.8/72.5
90.6/102.8
100/110
83/95
155/155
93.0/105.1
100/110
86/97
157/157
15.8/21.0
75.8/87.5
106.9/121.5
110/125
98/112
155/155
109.3/123.9
110/125
101/114
157/157
MED
---
---
46.1
60
45
180
48.0
60
48
182
4.9/6.5
23.5/27.1
46.1/48.6
60/60
45/45
180/180
48.0/51.0
60/60
48/48
182/182
6.5/8.7
31.4/36.3
54.0/60.1
60/70
50/55
180/180
56.4/62.5
60/70
52/58
182/182
9.8/13.0
46.9/54.2
73.4/82.5
80/90
68/76
180/180
75.8/84.9
80/90
70/78
182/182
13.1/17.4
62.8/72.5
93.3/105.4
100/110
86/97
180/180
95.6/107.8
100/110
88/99
182/182
15.8/21.0
75.8/87.5
109.5/124.1
110/125
101/114
180/180
111.9/126.5
125/150
103/116
182/182
208/
230
---
3
---
60
STD
---
---
30.7
45
31
131
32.6
45
33
133
4.9/6.5
13.6/15.6
30.7/31.6
45/45
31/31
131/131
32.6/34.0
45/45
33/33
133/133
7.9/10.5
21.9/25.3
39.5/43.8
45/45
36/40
131/131
41.9/46.1
45/50
39/42
133/133
12.0/16.0
33.4/38.5
53.9/60.3
60/70
50/55
131/131
56.3/62.6
60/70
52/58
133/133
15.8/21.0
43.8/50.5
66.9/75.3
70/80
62/69
131/131
69.3/77.6
70/80
64/71
133/133
19.9/26.5
55.2/63.8
81.1/91.9
90/100
75/85
131/131
83.5/94.3
90/100
77/87
133/133
MED
---
---
31.0
45
31
149
32.9
45
33
151
4.9/6.5
13.6/15.6
31.0/32.0
45/45
31/31
149/149
32.9/34.4
45/45
33/33
151/151
7.9/10.5
21.9/25.3
39.9/44.1
45/45
37/41
149/149
42.3/46.5
45/50
39/43
151/151
12.0/16.0
33.4/38.5
54.3/60.6
60/70
50/56
149/149
56.6/63.0
60/70
52/58
151/151
15.8/21.0
43.8/50.5
67.3/75.6
70/80
62/70
149/149
69.6/78.0
70/80
64/72
151/151
19.9/26.5
55.2/63.8
81.5/92.3
90/100
75/85
149/149
83.9/94.6
90/100
77/87
151/151
HIGH
---
---
33.3
45
34
175
35.2
50
36
177
4.9/6.5
13.6/15.6
33.3/34.9
45/45
34/34
175/175
35.2/37.3
50/50
36/36
177/177
7.9/10.5
21.9/25.3
42.8/47.0
45/50
39/43
175/175
45.1/49.4
50/50
42/45
177/177
12.0/16.0
33.4/38.5
57.1/63.5
60/70
53/58
175/175
59.5/65.9
60/70
55/61
177/177
15.8/21.0
43.8/50.5
70.1/78.5
80/80
65/72
175/175
72.5/80.9
80/90
67/74
177/177
19.9/26.5
55.2/63.8
84.4/95.1
90/100
78/88
175/175
86.8/97.5
90/100
80/90
177/177
46
0
---
3
---
60
STD
---
---
14.7
20
15
62
15.7
20
16
63
6.0
7.2
14.7
20
15
62
15.7
20
16
63
11.5
13.8
22.6
25
21
62
23.9
25
22
63
14.0
16.8
26.4
30
24
62
27.6
30
25
63
23.0
27.7
40.0
45
37
62
41.3
45
38
63
25.5
30.7
43.8
45
40
62
45.0
50
41
63
MED
---
---
15.2
20
15
71
16.2
20
16
72
6.0
7.2
15.2
20
15
71
16.3
20
16
72
11.5
13.8
23.3
25
21
71
24.5
25
23
72
14.0
16.8
27.0
30
25
71
28.3
30
26
72
23.0
27.7
40.6
45
37
71
41.9
45
39
72
25.5
30.7
44.4
45
41
71
45.6
50
42
72
HIGH
---
---
16.0
20
16
84
17.0
20
17
85
6.0
7.2
16.0
20
16
84
17.3
20
17
85
11.5
13.8
24.3
25
22
84
25.5
30
23
85
14.0
16.8
28.0
30
26
84
29.3
30
27
85
23.0
27.7
41.6
45
38
84
42.9
45
39
85
25.5
30.7
45.4
50
42
84
46.6
50
43
85
57
5
---
3
---
60
STD
---
---
11.5
15
12
48
13.4
15
14
50
MED
---
---
12.4
15
13
65
14.3
20
15
67
HIGH
---
---
12.4
15
13
65
14.3
20
15
67
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.
% 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
Maximum deviation is 4 v.
(BC) 231 – 227 = 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%, con-
tact your local electric utility company immediately.
558J