Bryant LEGACY 558J Product Data page 38

Table 34 – 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
--- 39.2 60
23.5/27.1 39.2/40.0 60/60
31.4/36.3 45.4/51.5 60/60
46.9/54.2 64.8/73.9 70/80
62.8/72.5 84.6/96.8 90/100
75.8/87.5 100.9/115.5 110/125
--- 41.3 60
23.5/27.1 41.3/42.6 60/60
31.4/36.3 48.0/54.1 60/60
46.9/54.2 67.4/76.5 70/80
62.8/72.5 87.3/99.4 90/100
75.8/87.5 103.5/118.1 110/125
--- 25.9 30
13.6/15.6 25.9/25.9 30/30
21.9/25.3 33.5/37.8 40/40
33.4/38.5 47.9/54.3 50/60
43.8/50.5 60.9/69.3 70/70
55.2/63.8 75.1/85.9 80/90
--- 26.2 40
13.6/15.6 26.2/26.2 40/40
21.9/25.3 33.9/38.1 40/40
33.4/38.5 48.3/54.6 50/60
43.8/50.5 61.3/69.6 70/70
55.2/63.8 75.5/86.3 80/90
--- 28.5 40
13.6/15.6 28.5/28.9 40/40
21.9/25.3 36.8/41.0 40/45
33.4/38.5 51.1/57.5 60/60
43.8/50.5 64.1/72.5 70/80
55.2/63.8 78.4/89.1 80/90
--- 12.5 20
7.2 12.5 20
13.8 19.9 20
16.8 23.6 25
27.7 37.3 40
30.7 41.0 45
--- 13.0 20
7.2 13.0 20
13.8 20.5 25
16.8 24.3 25
27.7 37.9 40
30.7 41.6 45
--- 13.8 20
7.2 13.8 20
13.8 21.5 25
16.8 25.3 30
27.7 38.9 40
30.7 42.6 45
--- 9.8 15
--- 10.7 15
--- 10.7 15
average voltage
NO C.O. or UNPWRD C.O.
NO P .E.
DISC. SIZE
FLA LRA
37 150
37/37 150/150 41.1/42.4
42/47 150/150 47.8/53.9
60/68 150/150 67.1/76.3
78/89 150/150 87.0/99.1
93/106 150/150 103.3/117.9
40 175
40/40 175/175 43.2/45.0
44/50 175/175 50.4/56.5
62/70 175/175 69.8/78.9
80/91 175/175 89.6/101.8
95/109 175/175 105.9/120.5
25 126
25/25 126/126 27.8/28.0
31/35 126/126 35.9/40.1
44/50 126/126 50.3/56.6
56/64 126/126 63.3/71.6
69/79 126/126 77.5/88.3
26 144
26/26 144/144 28.1/28.4
31/35 144/144 36.3/40.5
44/50 144/144 50.6/57.0
56/64 144/144 63.6/72.0
69/79 144/144 77.9/88.6
28 170
28/28 170/170 30.4/31.3
34/38 170/170 39.1/43.4
47/53 170/170 53.5/59.9
59/67 170/170 66.5/74.9
72/82 170/170 80.8/91.5
12 60
12 60
18 60
22 60
34 60
38 60
13 69
13 69
19 69
22 69
35 69
38 69
14 82
14 82
20 82
23 82
36 82
39 82
10 46
11 63
11 63
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.
38
w/ P .E. (pwrd fr/unit)
DISC. SIZE
MCA MOCP
FLA
41.1 60 40
60/60 40/40
60/60 44/50
70/80 62/70
90/100 80/91
110/125 95/108
43.2 60 42
60/60 42/42
60/60 46/52
70/80 64/73
90/110 82/94
110/125 97/111
27.8 40 27
40/40 27/27
40/45 33/37
60/60 46/52
70/80 58/66
80/90 71/81
28.1 40 28
40/40 28/28
40/45 33/37
60/60 47/52
70/80 59/66
80/90 72/82
30.4 45 30
45/45 30/30
45/45 36/40
60/60 49/55
70/80 61/69
90/100 74/84
13.5 20 13
13.5 20 13
21.1 25 19
24.9 25 23
38.5 40 35
42.3 45 39
14.0 20 14
14.0 20 14
21.8 25 20
25.5 30 23
39.1 40 36
42.9 45 39
14.8 20 15
14.8 20 15
22.8 25 21
26.5 30 24
40.1 45 37
43.9 45 40
11.7 15 12
12.6 15 13
12.6 15 13
(224 + 231 + 226)
=
3
227
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
4
= 100 x
227
= 1.76%
LRA
152
152/152
152/152
152/152
152/152
152/152
177
177/177
177/177
177/177
177/177
177/177
128
128/128
128/128
128/128
128/128
128/128
146
146/146
146/146
146/146
146/146
146/146
172
172/172
172/172
172/172
172/172
172/172
61
61
61
61
61
61
70
70
70
70
70
70
83
83
83
83
83
83
48
65
65
681
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