Table 34 – mca/mocp determination w/ pwrd c.o – Bryant LEGACY 558J User Manual
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Table 34 – MCA/MOCP DETERMINATION W/ PWRD C.O.
UN
IT
V
---
P
H
---
H
Z
IFM
TYPE
ELECTRIC HEATER
NO C.O. or UNPWRD 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
6
208/
230
---
1
---
60
STD
---
---
39.2
60
37
150
41.1
60
40
152
4.9/6.5
23.5/27.1
39.2/40.0
60/60
37/37
150/150
41.1/42.4
60/60
40/40
152/152
6.5/8.7
31.4/36.3
45.4/51.5
60/60
42/47
150/150
47.8/53.9
60/60
44/50
152/152
9.8/13.0
46.9/54.2
64.8/73.9
70/80
60/68
150/150
67.1/76.3
70/80
62/70
152/152
13.1/17.4
62.8/72.5
84.6/96.8
90/100
78/89
150/150
87.0/99.1
90/100
80/91
152/152
15.8/21.0
75.8/87.5
100.9/115.5
110/125
93/106
150/150
103.3/117.9
110/125
95/108
152/152
MED
---
---
41.3
60
40
175
43.2
60
42
177
4.9/6.5
23.5/27.1
41.3/42.6
60/60
40/40
175/175
43.2/45.0
60/60
42/42
177/177
6.5/8.7
31.4/36.3
48.0/54.1
60/60
44/50
175/175
50.4/56.5
60/60
46/52
177/177
9.8/13.0
46.9/54.2
67.4/76.5
70/80
62/70
175/175
69.8/78.9
70/80
64/73
177/177
13.1/17.4
62.8/72.5
87.3/99.4
90/100
80/91
175/175
89.6/101.8
90/110
82/94
177/177
15.8/21.0
75.8/87.5
103.5/118.1
110/125
95/109
175/175
105.9/120.5
110/125
97/111
177/177
208/
230
---
3
---
60
STD
---
---
25.9
30
25
126
27.8
40
27
128
4.9/6.5
13.6/15.6
25.9/25.9
30/30
25/25
126/126
27.8/28.0
40/40
27/27
128/128
7.9/10.5
21.9/25.3
33.5/37.8
40/40
31/35
126/126
35.9/40.1
40/45
33/37
128/128
12.0/16.0
33.4/38.5
47.9/54.3
50/60
44/50
126/126
50.3/56.6
60/60
46/52
128/128
15.8/21.0
43.8/50.5
60.9/69.3
70/70
56/64
126/126
63.3/71.6
70/80
58/66
128/128
19.9/26.5
55.2/63.8
75.1/85.9
80/90
69/79
126/126
77.5/88.3
80/90
71/81
128/128
MED
---
---
26.2
40
26
144
28.1
40
28
146
4.9/6.5
13.6/15.6
26.2/26.2
40/40
26/26
144/144
28.1/28.4
40/40
28/28
146/146
7.9/10.5
21.9/25.3
33.9/38.1
40/40
31/35
144/144
36.3/40.5
40/45
33/37
146/146
12.0/16.0
33.4/38.5
48.3/54.6
50/60
44/50
144/144
50.6/57.0
60/60
47/52
146/146
15.8/21.0
43.8/50.5
61.3/69.6
70/70
56/64
144/144
63.6/72.0
70/80
59/66
146/146
19.9/26.5
55.2/63.8
75.5/86.3
80/90
69/79
144/144
77.9/88.6
80/90
72/82
146/146
HIGH
---
---
28.5
40
28
170
30.4
45
30
172
4.9/6.5
13.6/15.6
28.5/28.9
40/40
28/28
170/170
30.4/31.3
45/45
30/30
172/172
7.9/10.5
21.9/25.3
36.8/41.0
40/45
34/38
170/170
39.1/43.4
45/45
36/40
172/172
12.0/16.0
33.4/38.5
51.1/57.5
60/60
47/53
170/170
53.5/59.9
60/60
49/55
172/172
15.8/21.0
43.8/50.5
64.1/72.5
70/80
59/67
170/170
66.5/74.9
70/80
61/69
172/172
19.9/26.5
55.2/63.8
78.4/89.1
80/90
72/82
170/170
80.8/91.5
90/100
74/84
172/172
46
0
---
3
---
60
STD
---
---
12.5
20
12
60
13.5
20
13
61
6.0
7.2
12.5
20
12
60
13.5
20
13
61
11.5
13.8
19.9
20
18
60
21.1
25
19
61
14.0
16.8
23.6
25
22
60
24.9
25
23
61
23.0
27.7
37.3
40
34
60
38.5
40
35
61
25.5
30.7
41.0
45
38
60
42.3
45
39
61
MED
---
---
13.0
20
13
69
14.0
20
14
70
6.0
7.2
13.0
20
13
69
14.0
20
14
70
11.5
13.8
20.5
25
19
69
21.8
25
20
70
14.0
16.8
24.3
25
22
69
25.5
30
23
70
23.0
27.7
37.9
40
35
69
39.1
40
36
70
25.5
30.7
41.6
45
38
69
42.9
45
39
70
HIGH
---
---
13.8
20
14
82
14.8
20
15
83
6.0
7.2
13.8
20
14
82
14.8
20
15
83
11.5
13.8
21.5
25
20
82
22.8
25
21
83
14.0
16.8
25.3
30
23
82
26.5
30
24
83
23.0
27.7
38.9
40
36
82
40.1
45
37
83
25.5
30.7
42.6
45
39
82
43.9
45
40
83
57
5
---
3
---
60
STD
---
---
9.8
15
10
46
11.7
15
12
48
MED
---
---
10.7
15
11
63
12.6
15
13
65
HIGH
---
---
10.7
15
11
63
12.6
15
13
65
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