Table 39 – mca/mocp determination w/ pwrd c.o – Bryant LEGACY 558J User Manual
Page 43
43
Table 39 – 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
7
208/
230
---
1
---
60
STD
---
---
38.5
60
38
138
40.4
60
40
140
3.3/4.4
15.9/18.3
38.5/38.5
60/60
38/38
138/138
40.4/40.4
60/60
40/40
140/140
6.5/8.7
31.4/36.3
51.4/57.5
60/60
47/53
138/138
53.8/59.9
60/60
49/55
140/140
9.8/13.0
46.9/54.2
70.8/79.9
80/80
65/73
138/138
73.1/82.3
80/90
67/76
140/140
13.1/17.4
62.8/72.5
90.6/102.8
100/110
83/95
138/138
93.0/105.1
100/110
86/97
140/140
15.8/21.0
75.8/87.5
106.9/121.5
110/125
98/112
138/138
109.3/123.9
110/125
101/114
140/140
MED
---
---
38.5
60
38
138
40.4
60
40
140
3.3/4.4
15.9/18.3
38.5/38.5
60/60
38/38
138/138
40.4/40.4
60/60
40/40
140/140
6.5/8.7
31.4/36.3
51.4/57.5
60/60
47/53
138/138
53.8/59.9
60/60
49/55
140/140
9.8/13.0
46.9/54.2
70.8/79.9
80/80
65/73
138/138
73.1/82.3
80/90
67/76
140/140
13.1/17.4
62.8/72.5
90.6/102.8
100/110
83/95
138/138
93.0/105.1
100/110
86/97
140/140
15.8/21.0
75.8/87.5
106.9/121.5
110/125
98/112
138/138
109.3/123.9
110/125
101/114
140/140
208/
230
---
3
---
60
STD
---
---
28.3
40
29
104
30.2
40
31
106
4.9/6.5
13.6/15.6
29.1/31.6
40/40
29/29
104/104
31.5/34.0
40/40
31/31
106/106
6.5/8.7
18.1/20.9
34.8/38.3
40/40
32/35
104/104
37.1/40.6
40/45
34/37
106/106
12.0/16.0
33.4/38.5
53.9/60.3
60/70
50/55
104/104
56.3/62.6
60/70
52/58
106/106
15.8/21.0
43.8/50.5
66.9/75.3
70/80
62/69
104/104
69.3/77.6
70/80
64/71
106/106
MED
---
---
28.3
40
29
104
30.2
40
31
106
4.9/6.5
13.6/15.6
29.1/31.6
40/40
29/29
104/104
31.5/34.0
40/40
31/31
106/106
6.5/8.7
18.1/20.9
34.8/38.3
40/40
32/35
104/104
37.1/40.6
40/45
34/37
106/106
12.0/16.0
33.4/38.5
53.9/60.3
60/70
50/55
104/104
56.3/62.6
60/70
52/58
106/106
15.8/21.0
43.8/50.5
66.9/75.3
70/80
62/69
104/104
69.3/77.6
70/80
64/71
106/106
HIGH
---
---
28.6
40
29
122
30.5
40
31
124
4.9/6.5
13.6/15.6
29.5/32.0
40/40
29/29
122/122
31.9/34.4
40/40
31/32
124/124
6.5/8.7
18.1/20.9
35.1/38.6
40/40
32/36
122/122
37.5/41.0
40/45
35/38
124/124
12.0/16.0
33.4/38.5
54.3/60.6
60/70
50/56
122/122
56.6/63.0
60/70
52/58
124/124
15.8/21.0
43.8/50.5
67.3/75.6
70/80
62/70
122/122
69.6/78.0
70/80
64/72
124/124
46
0
---
3
---
60
STD
---
---
12.9
15
13
51
13.9
20
14
52
6.0
7.2
14.4
15
13
51
15.6
20
14
52
11.5
13.8
22.6
25
21
51
23.9
25
22
52
14.0
16.8
26.4
30
24
51
27.6
30
25
52
23.0
27.7
40.0
45
37
51
41.3
45
38
52
MED
---
---
12.9
15
13
51
13.9
20
14
52
6.0
7.2
14.4
15
13
51
15.6
20
14
52
11.5
13.8
22.6
25
21
51
23.9
25
22
52
14.0
16.8
26.4
30
24
51
27.6
30
25
52
23.0
27.7
40.0
45
37
51
41.3
45
38
52
HIGH
---
---
13.4
15
14
60
14.4
20
15
61
6.0
7.2
15.0
15
14
60
16.3
20
15
61
11.5
13.8
23.3
25
21
60
24.5
25
23
61
14.0
16.8
27.0
30
25
60
28.3
30
26
61
23.0
27.7
40.6
45
37
60
41.9
45
39
61
57
5
---
3
---
60
STD
---
---
9.0
15
9
46
10.9
15
11
48
MED
---
---
9.0
15
9
46
10.9
15
11
48
HIGH
---
---
9.1
15
9
52
11.0
15
12
54
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