Bryant PACKAGED HEAT PUMP 548J User Manual
Page 49
49
Table 46 – MCA/MOCP DETERMINATION WITHOUT C.O. OR UNPWRD C.O.
UN
IT
N
O
M
.V
---
P
H
---
H
Z
IFM
TYPE
ELEC. HTR
WITHOUT C.O. or UNPWR C.O.
Nom
(kW)
FLA
WITHOUT P.E.
WITH P.E.
MCA
MOCP
DISC. SIZE
MCA
MOCP
DISC. SIZE
FLA
LRA
FLA
LRA
548J
*0
4
208/
230
---
1
---
60
DD---STD
---
---
30.7
45
30
121
32.6
50
32
123
3.3/4.4
15.9/18.3
50.6/53.6
60/60
48/51
137/139
52.5/55.5
60/60
51/53
139/141
4.9/6.5
23.5/27.1
60.1/64.6
70/70
57/61
145/148
62.0/66.5
70/70
59/63
147/150
6.5/8.7
31.4/36.3
69.9/76.1
70/80
66/72
152/157
71.8/78.0
80/80
68/74
154/159
7.9/10.5
37.9/43.8
78.1/85.4
80/90
74/81
159/165
80.0/87.3
80/90
76/83
161/167
9.8/13.0
46.9/54.2
89.3/98.4
90/100
84/92
215/229
91.2/100.3
100/110
86/95
217/231
208/
230
---
3
---
60
DD---STD
---
---
24.8
30
25
97
26.7
30
27
99
3.3/4.4
9.2/10.6
36.3/38.1
45/45
35/37
106/108
38.2/40.0
45/50
37/39
108/110
4.9/6.5
13.6/15.6
41.8/44.3
50/50
40/43
111/113
43.7/46.2
50/50
43/45
113/115
6.5/8.7
18.1/20.9
47.4/50.9
50/60
46/49
115/118
49.3/52.8
50/60
48/51
117/120
7.9/10.5
21.9/25.3
52.2/56.4
60/60
50/54
119/122
54.1/58.3
60/60
52/56
121/124
12.0/16.0
33.4/38.5
66.6/72.9
70/80
63/69
130/136
68.5/74.8
70/80
65/71
132/138
MED
---
---
22.6
30
22
109
24.5
30
24
111
3.3/4.4
9.2/10.6
34.1/35.9
45/45
33/34
118/120
36.0/37.8
45/45
35/37
120/122
4.9/6.5
13.6/15.6
39.6/42.1
45/50
38/40
123/125
41.5/44.0
50/50
40/42
125/127
6.5/8.7
18.1/20.9
45.2/48.7
50/50
43/46
127/130
47.1/50.6
50/60
45/48
129/132
7.9/10.5
21.9/25.3
50.0/54.2
50/60
47/51
131/134
51.9/56.1
60/60
50/53
133/136
12.0/16.0
33.4/38.5
64.4/70.7
70/80
61/66
142/148
66.3/72.6
70/80
63/69
144/150
HIGH
---
---
22.6
30
22
120
24.5
30
24
122
3.3/4.4
9.2/10.6
34.1/35.9
45/45
33/34
129/131
36.0/37.8
45/45
35/37
131/133
4.9/6.5
13.6/15.6
39.6/42.1
45/50
38/40
134/136
41.5/44.0
50/50
40/42
136/138
6.5/8.7
18.1/20.9
45.2/48.7
50/50
43/46
138/141
47.1/50.6
50/60
45/48
140/143
7.9/10.5
21.9/25.3
50.0/54.2
50/60
47/51
142/145
51.9/56.1
60/60
50/53
144/147
12.0/16.0
33.4/38.5
64.4/70.7
70/80
61/66
153/159
66.3/72.6
70/80
63/69
155/161
46
0
---
3
---
60
DD---STD
---
---
16.0
20
16
53
17.0
20
17
54
6.0
7.2
25.0
30
24
60
26.0
30
26
61
8.8
10.6
29.3
30
28
64
30.3
35
30
65
11.5
13.8
33.3
35
32
67
34.3
35
33
68
14.0
16.8
37.0
40
36
70
38.0
40
37
71
MED
---
---
10.6
15
10
54
11.6
15
12
55
6.0
7.2
19.6
20
19
61
20.6
25
20
62
8.8
10.6
23.9
25
23
65
24.9
25
24
66
11.5
13.8
27.9
30
26
68
28.9
30
27
69
14.0
16.8
31.6
35
30
71
32.6
35
31
72
HIGH
---
---
10.6
15
10
60
11.6
15
12
61
6.0
7.2
19.6
20
19
67
20.6
25
20
68
8.8
10.6
23.9
25
23
71
24.9
25
24
72
11.5
13.8
27.9
30
26
74
28.9
30
27
75
14.0
16.8
31.6
35
30
77
32.6
35
31
78
57
5
---
3
---
60
DD---STD
---
---
5.4
15
5
5
7.4
15
7
7
MED
---
---
3.4
15
3
8
5.4
15
5
10
HIGH
---
---
2.9
15
3
12
4.9
15
5
14
LEGEND
C.O.
--- Convenient outlet
DD
--- Electric Drive X13 Motor
DISC
--- Disconnect
FLA
--- Full load amps
IFM
--- Indoor fan motor
LRA
--- Locked rotor amps
MCA
--- Minimum circuit amps
MOCP
--- Maximum over current protection
P.E.
--- Power exhaust
UNPWRD C.O. --- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for multimotor and
combination 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 cir-
cuit 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 de-
termine 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 = 224V
BC = 231V
AC = 226V
Average Voltage =
(224 + 231 + 226)
=
681
3
3
=
227
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3V
Maximum deviation is 4V.
(BC) 231 – 227 = 4V
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%, contact your local electric utility company immediately.
548J