Bryant LEGACY 558J Product Data page 40

Table 36 – MCA/MOCP DETERMINATION W/ PWRD C.O.
ELECTRIC HEATER
IFM
TYPE
kW
---
3.3/4.4
4.9/6.5
STD
6.5/8.7
7.9/10.5
9.8/13.0
---
3.3/4.4
4.9/6.5
MED
6.5/8.7
7.9/10.5
9.8/13.0
---
3.3/4.4
4.9/6.5
STD
6.5/8.7
7.9/10.5
12.0/16.0
---
3.3/4.4
4.9/6.5
MED
6.5/8.7
7.9/10.5
12.0/16.0
---
3.3/4.4
4.9/6.5
HIGH
6.5/8.7
7.9/10.5
12.0/16.0
---
6.0
STD 8.8
11.5
14.0
---
6.0
MED 8.8
11.5
14.0
---
6.0
HIGH 8.8
11.5
14.0
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
--- 32.0 45
15.9/18.3 32.0/35.0 45/45
23.5/27.1 41.5/46.0 45/50
31.4/36.3 51.4/57.5 60/60
37.9/43.8 59.5/66.9 60/70
46.9/54.2 70.8/79.9 80/80
--- 32.0 45
15.9/18.3 32.0/35.0 45/45
23.5/27.1 41.5/46.0 45/50
31.4/36.3 51.4/57.5 60/60
37.9/43.8 59.5/66.9 60/70
46.9/54.2 70.8/79.9 80/80
--- 24.2 30
9.2/10.6 24.2/25.4 30/30
13.6/15.6 29.1/31.6 30/35
18.1/20.9 34.8/38.3 35/40
21.9/25.3 39.5/43.8 40/45
33.4/38.5 53.9/60.3 60/70
--- 24.2 30
9.2/10.6 24.2/25.4 30/30
13.6/15.6 29.1/31.6 30/35
18.1/20.9 34.8/38.3 35/40
21.9/25.3 39.5/43.8 40/45
33.4/38.5 53.9/60.3 60/70
--- 24.5 30
9.2/10.6 24.5/25.8 30/30
13.6/15.6 29.5/32.0 30/35
18.1/20.9 35.1/38.6 40/40
21.9/25.3 39.9/44.1 40/45
33.4/38.5 54.3/60.6 60/70
--- 12.4 15
7.2 14.4 15
10.6 18.6 20
13.8 22.6 25
16.8 26.4 30
--- 12.4 15
7.2 14.4 15
10.6 18.6 20
13.8 22.6 25
16.8 26.4 30
--- 12.9 15
7.2 15.0 15
10.6 19.3 20
13.8 23.3 25
16.8 27.0 30
--- 9.0 15
--- 9.0 15
--- 9.1 15
average voltage
w/ PWRD C.O.
NO P .E.
DISC. SIZE
FLA LRA
32 100
32/32 100/100
38/42 100/100
47/53 100/100
55/62 100/100
65/73 100/100
32 100
32/32 100/100
38/42 100/100
47/53 100/100
55/62 100/100
65/73 100/100
25 94
25/25 94/94
27/29 94/94
32/35 94/94
36/40 94/94
50/55 94/94
25 94
25/25 94/94
27/29 94/94
32/35 94/94
36/40 94/94
50/55 94/94
25 112
25/25 112/112
27/29 112/112
32/36 112/112
37/41 112/112
50/56 112/112
13 48
13 48
17 48
21 48
24 48
13 48
13 48
17 48
21 48
24 48
13 57
14 57
18 57
21 57
25 57
9 46
9 46
9 52
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.
40
w/ P .E. (pwrd fr/unit)
DISC. SIZE
MCA MOCP
FLA
33.9 50 34
34.4/37.4 50/50 34/34
43.9/48.4 50/50 40/45
53.8/59.9 60/60 49/55
61.9/69.3 70/70 57/64
73.1/82.3 80/90 67/76
33.9 50 34
34.4/37.4 50/50 34/34
43.9/48.4 50/50 40/45
53.8/59.9 60/60 49/55
61.9/69.3 70/70 57/64
73.1/82.3 80/90 67/76
26.1 30 27
26.1/27.8 30/30 27/27
31.5/34.0 35/35 29/31
37.1/40.6 40/45 34/37
41.9/46.1 45/50 39/42
56.3/62.6 60/70 52/58
26.1 30 27
26.1/27.8 30/30 27/27
31.5/34.0 35/35 29/31
37.1/40.6 40/45 34/37
41.9/46.1 45/50 39/42
56.3/62.6 60/70 52/58
26.4 30 27
26.4/28.1 30/30 27/27
31.9/34.4 35/35 29/32
37.5/41.0 40/45 35/38
42.3/46.5 45/50 39/43
56.6/63.0 60/70 52/58
13.4 15 14
15.6 20 14
19.9 20 18
23.9 25 22
27.6 30 25
13.4 15 14
15.6 20 14
19.9 20 18
23.9 25 22
27.6 30 25
13.9 20 14
16.3 20 15
20.5 25 19
24.5 25 23
28.3 30 26
10.9 15 11
10.9 15 11
11.0 15 12
(224 + 231 + 226)
=
3
227
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
4
= 100 x
227
= 1.76%
LRA
102
102/102
102/102
102/102
102/102
102/102
102
102/102
102/102
102/102
102/102
102/102
96
96/96
96/96
96/96
96/96
96/96
96
96/96
96/96
96/96
96/96
96/96
114
114/114
114/114
114/114
114/114
114/114
49
49
49
49
49
49
49
49
49
49
58
58
58
58
58
48
48
54
681
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