134 electrical data (cont) – Bryant 581A/B User Manual
Page 134
134
ELECTRICAL DATA (cont)
581B036-150 UNITS
LEGEND
*The values listed in this table do not include power exhaust. See table at right for power
exhaust requirements.
†Used to determine minimum disconnect per NEC.
**Fuse or HACR circuit breaker.
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. The UL, Canada units may be fuse or circuit breaker.
2.
Electrical data based on 95 F ambient outdoor-air temperature ± 10% voltage.
3.
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 percent of voltage imbalance.
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of 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%, contact your local
electric utility company immediately.
POWER EXHAUST ELECTRICAL DATA
N/A — Not Available
*Single or three phase.
NOTE: If a single power source is to be used, size wire to include power exhaust MCA
and MOCP.
Check MCA and MOCP when power exhaust is powered through the unit. Determine the
new MCA including the power exhaust using the following formula:
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 581B060 unit with MCA = 28.9 and MOCP = 35, with
CRPWREXH030A01 power exhaust.
MCA New = 28.9 amps + 1.6 amps = 30.5 amps
If the new MCA does not exceed the published MOCP, then MOCP would not change.
The MOCP in this example is 35 amps and the MCA New is below 35; therefore the
MOCP is acceptable. If “MCA New” is larger than the published MOCP, raise the MOCP
to the next larger size. For separate power, the MOCP for the power exhaust will be
15 amps per NEC.
UNIT SIZE
581B
NOMINAL
V-PH-Hz
IFM TYPE
CONV
OUTLET
VOLTAGE
RANGE
COMPRESSOR (each)
OFM (each)
IFM
FLA
COMBUSTION
FAN MOTOR
POWER SUPPLY*
MINIMUM UNIT
DISCONNECT SIZE†
Min
Max
Qty
RLA
LRA
Qty
FLA
FLA
MCA
MOCP**
FLA
LRA
102
(8
1
/
2
Tons)
208/230-3-60
STD
NO
187
254
2
13.1
105
2
1.4
7.5
0.6
40.2
45
42
276
YES
46.2
50
48
281
HIGH
NO
10.6
43.3
50
46
301
YES
49.3
60
51
305
460-3-60
STD
NO
414
508
2
7.4
55
2
0.7
3.4
0.3
21.5
25
23
143
YES
24.2
30
25
145
HIGH
NO
4.8
22.9
25
24
156
YES
25.6
30
27
158
575-3-60
STD
NO
518
632
2
6.4
44
2
0.6
2.8
0.3
18.2
20
19
115
YES
20.4
25
21
116
HIGH
NO
3.3
18.9
25
20
124
YES
21.1
25
22
126
PH
NO
0.7
4.8
0.3
19.4
25
20
124
YES
21.5
25
22
126
120
(10 Tons)
208/230-3-60
STD
NO
187
254
2
17.6
125
2
1.4
10.6
0.6
53.0
60
56
341
YES
59.0
70
61
345
HIGH
NO
15.0
0.6
57.4
70
61
364
YES
63.4
70
66
369
460-3-60
STD
NO
414
508
2
8.3
62.5
2
0.7
4.8
0.3
24.9
30
26
171
YES
27.6
30
29
173
HIGH
NO
7.4
27.5
30
29
182
YES
30.2
35
32
184
575-3-60
STD
NO
518
632
2
6.3
50
2
0.6
3.3
0.3
19.1
25
20
136
YES
21.3
25
22
138
HIGH
NO
5.6
0.3
21.0
25
23
146
YES
23.1
25
25
148
PH
NO
2
0.7
7.4
0.3
21.2
25
23
146
YES
23.4
25
25
148
150
(12
1
/
2
Tons)
208/230-3-60
STD
NO
187
254
2
19
156
2
1.4
15.0
0.6
60.6
70
64
426
YES
66.6
70
70
431
460-3-60
STD
NO
414
508
2
9
75
2
0.7
7.4
0.3
29.1
35
31
207
YES
31.8
35
33
209
575-3-60
ST
NO
518
632
2
7.4
54
2
0.6
5.6
0.3
23.5
30
25
154
YES
25.6
30
27
156
PH
NO
2
0.7
7.4
0.3
23.7
30
25
154
YES
25.9
30
27
156
CONV
— Convenience Outlet
FLA
— Full Load Amps
HACR
— Heating, Air Conditioning and Refrigeration
IFM
— Indoor (Evaporator) Fan Motor
LRA
— Locked Rotor Amps
MCA
— Minimum Circuit Amps
MOCP
— Maximum Overcurrent Protection
NEC
— National Electrical Code
OFM
— Outdoor (Condenser) Fan Motor
PH
— Perfect Humidity™ Dehumidification System
RLA
— Rated Load Amps
UL
— Underwriters’ Laboratories
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
= 457
% Voltage Imbalance = 100 x
7
457
= 1.53%
POWER EXHAUST
PART NO.
APPLICATION
USAGE
MCA
(230 V)
MCA
(460 V)
MCA
(575 V)
MOCP
(separate
power source
only)
CRPWREXH030A01
036-072*
1.6
N/A 0.64
15
CRPWREXH021A01
036-072
N/A 0.68
N/A
15
CRPWREXH022A01
090-150*
3.4
N/A 1.32
15
CRPWREXH023A01
090-150
N/A 1.4
N/A
15
CRPWREXH028A01
ALL*
1.7
N/A 0.68
15
CRPWREXH029A01
ALL
N/A 0.7
N/A
15
581
B0
36
-15
0