Bryant F User Manual
Page 81
81
MCA/MOCP DETERMINATION NO C.O. OR UNPWRD C.O.
UN
IT
NOM.
V---Ph---Hz
IFM
TYPE
COMBUSTION
FAN MOTOR
FLA
POWER
EXHAUST
FLA
NO C.O. or UNPWRD C.O.
NO P.E.
w/ P.E. (pwrd fr/ unit)
MCA
MOCP
DISC. SIZE
MCA
MOCP
DISC. SIZE
FLA
LRA
FLA
LRA
580J
*08D
,F
208/230---3---60
STD
0.48
3.8
43.6
50
46
198
47.4
60
51
202
MED
45.9
50
49
235
49.7
60
53
239
HIGH
53.8
60
58
261
57.6
70
62
265
460---3---60
STD
0.25
1.8
20.1
25
21
97
21.9
25
23
99
MED
20.9
25
22
116
22.7
25
24
118
HIGH
25.3
30
27
129
27.1
30
29
131
575---3---60
STD
0.24
3.8
14.8
20
16
79
18.6
20
20
83
MED
15.2
20
16
94
19.0
25
21
98
HIGH
18.3
20
19
108
22.1
25
24
112
580J
*12D
,F
208/230---3---60
STD
0.48
3.8
48.5
60
51
263
52.3
60
56
267
MED
53.3
60
57
306
57.1
70
61
310
HIGH
58.3
70
62
315
62.1
70
67
319
460---3---60
STD
0.25
1.8
23.7
30
25
125
25.5
30
27
127
MED
25.5
30
27
147
27.3
30
29
149
HIGH
28.5
35
31
151
30.3
35
33
153
575---3---60
STD
0.24
3.8
17.9
20
19
95
21.7
25
23
99
MED
18.7
25
20
106
22.5
25
24
110
HIGH
21.5
25
23
120
25.3
30
27
124
580J
*14D
,F
208/230---3---60
STD
0.48
3.8
65.5
80
69
365
69.3
80
73
369
MED
68.0
80
72
382
71.8
80
76
386
HIGH
Model not available due to high amperage draw.
460---3---60
STD
0.25
1.8
31.7
40
33
183
33.5
40
35
185
MED
32.7
40
35
192
34.5
45
37
194
HIGH
35.7
45
38
196
37.5
45
40
198
575---3---60
STD
0.24
3.8
24.0
30
25
144
27.8
30
30
148
MED
24.0
30
25
144
27.8
30
30
148
HIGH
26.8
30
29
158
30.6
35
33
162
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
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 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
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 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%, contact your local electric utility company immediately.
580J