Bryant 581A/B Product Information Manual page 77

UNIT SIZE NOMINAL IFM
580F V-PH-Hz TYPE
STD
208/230-3-60
HIGH
STD
103
460-3-60
(8 1 / Ton)
2
HIGH
STD
575-3-60
HIGH
STD
208/230-3-60 ALT
HIGH
STD
120
460-3-60 ALT
(10 Ton)
HIGH
STD
575-3-60 ALT
HIGH
STD
208/230-3-60 ALT
HIGH
STD
121
460-3-60 ALT
(10 Ton)
HIGH
STD
575-3-60 ALT
HIGH
LEGEND
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
RLA — Rated Load Amps
*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. 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 percent of voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
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.
ELECTRICAL DATA (cont)
VOLTAGE RANGE COMPRESSOR (each)
CONV
OUTLET
Min Max Qty
NO
YES
187 254
NO
YES
NO
YES
414 508
NO
YES
NO
YES
518 632
NO
YES
NO
YES
NO
187 254
YES
NO
YES
NO
YES
NO
414 508
YES
NO
YES
NO
YES
NO
518 632
YES
NO
YES
NO
YES
NO
187 254
YES
NO
YES
NO
YES
NO
414 508
YES
NO
YES
NO
YES
NO
518 632
YES
NO
YES
452 + 464 + 455
3
1371
=
3
= 457
OFM (each)
RLA LRA Qty FLA
2 17.3 120.0 2 1.4
2 7.9 70.0 2 0.7
2 5.5 50.0 2 0.6
2 15.8 130 2 1.4
2 7.9 64 2 0.7
2 6.6 52 2 0.6
2 15.8 130 2 1.4
2 7.9 64 2 0.7
2 6.6 52 2 0.6
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
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.
3. For units with power exhaust: 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 (must be in accordance with NEC and/or local codes). 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 580F060 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, 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.
POWER EXHAUST
PART NO.
CRPWREXH030A01
CRPWREXH021A01
CRPWREXH022A01
CRPWREXH023A01
CRPWREXH028A01
CRPWREXH029A01
*Single or three phase.
77
COMBUSTION
POWER SUPPLY
IFM
FAN MOTOR
FLA
FLA MCA MOCP†
44.3
5.8
49.1
0.6
49.1
10.6
53.9
21.0
2.6
23.2
0.3
23.2
4.8
25.4
16.7
2.0
18.4
0.3
18.5
2.8
20.2
44.2
5.8
50.2
45.9
7.5 0.6
51.9
53.4
15.0
59.4
21.8
2.6
27.8
22.6
3.4 0.3
25.3
26.6
7.4
29.3
18.1
2.0
24.1
18.7
2.0 0.3
24.7
21.9
2.8
24.6
44.6
5.8
49.4
46.3
7.5 0.6
51.1
53.8
15.0
58.6
22.0
2.6
24.2
22.8
3.4 0.3
25.0
26.8
7.4
29.0
18.1
2.0
19.8
18.7
2.8 0.3
20.4
21.9
3.3
23.6
7
457
= 1.53%
POWER EXHAUST ELECTRICAL DATA
APPLICATION MCA MCA
USAGE (230 V) (460 V)
036-073* 1.6 N/A
036-073 N/A 0.68
090-151* 3.4 N/A
090-151 N/A 1.4
ALL* 1.7 N/A
ALL N/A 0.7
MINIMUM UNIT
DISCONNECT SIZE*
FLA LRA
50 46 272
60 52 277
60 52 316
60 57 320
25 22 149
30 24 151
30 24 171
30 27 173
20 17 109
25 19 111
25 19 126
25 21 128
50 46 307
60 52 311
50 48 326
60 54 330
60 57 374
70 62 378
25 23 152
30 25 154
25 24 191
30 26 193
30 28 185
35 31 187
25 19 123
25 21 109
25 20 155
25 22 141
30 23 150
30 25 136
50 46 307
60 52 312
60 48 326
60 54 331
60 57 374
70 62 379
25 23 152
30 25 154
25 24 191
30 26 193
30 28 185
35 30 187
20 19 123
25 21 125
20 20 150
25 22 156
25 23 155
25 25 151
MOCP
MCA (separate
(575 V) power source
only)
0.64 15
N/A 15
1.32 15
N/A 15
0.68 15
N/A 15