Bryant LEGACY 558J Product Data page 37

Table 33 – MCA/MOCP DETERMINATION NO C.O. OR UNPWRD C.O.
ELECTRIC HEATER
IFM
TYPE
kW
---
3.3/4.4
6.5/8.7
STD
9.8/13.0
13.1/17.4
15.8/21.0
---
3.3/4.4
6.5/8.7
MED
9.8/13.0
13.1/17.4
15.8/21.0
---
4.9/6.5
STD 6.5/8.7
12.0/16.0
15.8/21.0
---
4.9/6.5
MED 6.5/8.7
12.0/16.0
15.8/21.0
---
4.9/6.5
HIGH 6.5/8.7
12.0/16.0
15.8/21.0
---
6.0
STD 11.5
14.0
23.0
---
6.0
MED 11.5
14.0
23.0
---
6.0
HIGH 11.5
14.0
23.0
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
--- 33.7 50
15.9/18.3 33.7/33.7 50/50
31.4/36.3 45.4/51.5 50/60
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
--- 33.7 50
15.9/18.3 33.7/33.7 50/50
31.4/36.3 45.4/51.5 50/60
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
--- 23.5 30
13.6/15.6 23.5/25.6 30/30
18.1/20.9 28.8/32.3 30/35
33.4/38.5 47.9/54.3 50/60
43.8/50.5 60.9/69.3 70/70
--- 23.5 30
13.6/15.6 23.5/25.6 30/30
18.1/20.9 28.8/32.3 30/35
33.4/38.5 47.9/54.3 50/60
43.8/50.5 60.9/69.3 70/70
--- 23.8 30
13.6/15.6 23.8/26.0 30/30
18.1/20.9 29.1/32.6 30/35
33.4/38.5 48.3/54.6 50/60
43.8/50.5 61.3/69.6 70/70
--- 10.7 15
7.2 11.6 15
13.8 19.9 20
16.8 23.6 25
27.7 37.3 40
--- 10.7 15
7.2 11.6 15
13.8 19.9 20
16.8 23.6 25
27.7 37.3 40
--- 11.2 15
7.2 12.3 15
13.8 20.5 25
16.8 24.3 25
27.7 37.9 40
--- 7.3 15
--- 7.3 15
--- 7.4 15
average voltage
NO C.O. or UNPWRD C.O.
NO P .E.
DISC. SIZE
FLA LRA
32 133
32/32 133/133 35.6/35.6
42/47 133/133 47.8/53.9
60/68 133/133 67.1/76.3
78/89 133/133 87.0/99.1
93/106 133/133 103.3/117.9
32 133
32/32 133/133 35.6/35.6
42/47 133/133 47.8/53.9
60/68 133/133 67.1/76.3
78/89 133/133 87.0/99.1
93/106 133/133 103.3/117.9
23 99
23/24 99/99 25.5/28.0
26/30 99/99 31.1/34.6
44/50 99/99 50.3/56.6
56/64 99/99 63.3/71.6
23 99
23/24 99/99 25.5/28.0
26/30 99/99 31.1/34.6
44/50 99/99 50.3/56.6
56/64 99/99 63.3/71.6
23 117
23/24 117/117 25.9/28.4
27/30 117/117 31.5/35.0
44/50 117/117 50.6/57.0
56/64 117/117 63.6/72.0
10 49
11 49
18 49
22 49
34 49
10 49
11 49
18 49
22 49
34 49
11 58
11 58
19 58
22 58
35 58
7 44
7 44
7 50
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.
37
w/ P .E. (pwrd fr/unit)
DISC. SIZE
MCA MOCP
FLA
35.6 50 35
50/50 35/35
50/60 44/50
70/80 62/70
90/100 80/91
110/125 95/108
35.6 50 35
50/50 35/35
50/60 44/50
70/80 62/70
90/100 80/91
110/125 95/108
25.4 30 25
30/30 25/26
35/35 29/32
60/60 46/52
70/80 58/66
25.4 30 25
30/30 25/26
35/35 29/32
60/60 46/52
70/80 58/66
25.7 30 26
30/30 26/26
35/40 29/32
60/60 47/52
70/80 59/66
11.7 15 12
12.9 15 12
21.1 25 19
24.9 25 23
38.5 40 35
11.7 15 12
12.9 15 12
21.1 25 19
24.9 25 23
38.5 40 35
12.2 15 12
13.5 15 12
21.8 25 20
25.5 30 23
39.1 40 36
9.2 15 9
9.2 15 9
9.3 15 10
(224 + 231 + 226)
=
3
227
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
4
= 100 x
227
= 1.76%
LRA
135
135/135
135/135
135/135
135/135
135/135
135
135/135
135/135
135/135
135/135
135/135
101
101/101
101/101
101/101
101/101
101
101/101
101/101
101/101
101/101
119
119/119
119/119
119/119
119/119
50
50
50
50
50
50
50
50
50
50
59
59
59
59
59
46
46
52
681
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