Bryant 581B Air Conditioner User Manual


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Table 2A — Electrical Data — Standard Motor Units Without Electrical Convenience Outlet
Table 2B — Electrical Data — Standard Motor Units With Electrical Convenience Outlet
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 phase imbalance in supply voltage is greater
than 2%. Use the following formula to determine the percent voltage
imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
= 457
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.
% Voltage Imbalance = 100 x
= 1.53%
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
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. Deter-
mine the new MCA including the power exhaust using the following formula:
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 581B072 unit with MCA = 32.8 and MOCP = 40, with
CRPWREXH030A01 power exhaust.
MCA New = 32.8 amps + 1.6 amps = 34.4 amps
If the new MCA does not exceed the published MOCP, then MOCP would not
change. The MOCP in this example is 40 amps and the MCA New is below 40;
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
581B
NOMINAL VOLTAGE
(V-Ph-Hz)
VOLTAGE
RANGE
COMPRESSOR
(each)
OFM
(each)
IFM
COMBUSTION
FAN MOTOR
POWER
SUPPLY*
MINIMUM UNIT
DISCONNECT SIZE†
Min Max Qty RLA LRA FLA FLA FLA MCA MOCP** FLA LRA
036
(3 Tons)
208/230-1-60 187 254
1
16.0 88.0 0.7 4.9 .60 25.6/25.6 30/30 25/25 101/101
208/230-3-60 187 254 10.3 77.0 0.7 4.9 .60 18.5/18.5 25/25 18/18 90/90
460-3-60 414 508 5.1 39.0 0.4 2.2 .30 9.0 20 9 46
575-3-60 518 632 4.2 31.0 0.4 2.2 .30 7.3 20 7 37
048
(4 Tons)
208/230-1-60 187 254
1
23.7 126.0 0.7 4.9 .60 35.2/35.2 45/45 34/34 139/139
208/230-3-60 187 254 13.5 93.0 0.7 4.9 .60 22.5/22.5 30/30 22/22 106/106
460-3-60 414 508 6.4 46.5 0.4 2.2 .30 10.6 20 10 54
575-3-60 518 632 6.4 40.0 0.4 2.2 .30 10.1 20 10 46
060
(5 Tons)
208/230-1-60 187 254
1
28.8 169.0 1.5 8.8 .60 46.3/46.3 60/60 45/45 216/216
208/230-3-60 187 254 17.3 123.0 1.5 5.8 .60 28.9/28.9 35/35 28/28 168/168
460-3-60 414 508 9.0 62.0 0.8 2.6 .30 14.7 20 14 84
575-3-60 518 632 7.1 50.0 0.8 2.6 .30 11.6 20 12 68
072
(6 Tons)
208/230-3-60 187 254
1
20.5 156.0 1.4 5.8 .60 32.8/32.8 40/40 32/32 200/200
460-3-60 414 508 9.6 75.0 0.6 2.6 .30 15.2 20 15 97
575-3-60 518 632 7.7 56.0 0.6 2.6 .30 12.2 20 12 74
UNIT
581B
NOMINAL VOLTAGE
(V-Ph-Hz)
VOLTAGE
RANGE
COMPRESSOR
(each)
OFM
(each)
IFM
COMBUSTION
FAN MOTOR
POWER
SUPPLY
WITH OUTLET*
MINIMUM UNIT
DISCONNECT SIZE†
Min Max Qty RLA LRA FLA FLA FLA MCA MOCP** FLA LRA
036
(3 Tons)
208/230-1-60 187 254
1
16.0 88.0 0.7 4.9 .60 31.6/31.6 35/35 30/30 106/106
208/230-3-60 187 254 10.3 77.0 0.7 4.9 .60 24.5/24.5 30/30 24/24 95/95
460-3-60 414 508 5.1 39.0 0.4 2.2 .30 11.7 20 11 48
575-3-60 518 632 4.2 31.0 0.4 2.2 .30 9.5 20 9 38
048
(4 Tons)
208/230-1-60 187 254
1
23.7 126.0 0.7 4.9 .60 41.2/41.2 50/50 39/39 144/144
208/230-3-60 187 254 13.5 93.0 0.7 4.9 .60 28.5/28.5 35/35 27/27 111/111
460-3-60 414 508 6.4 46.5 0.4 2.2 .30 13.3 20 13 56
575-3-60 518 632 6.4 40.0 0.4 2.2 .30 12.2 20 12 47
060
(5 Tons)
208/230-1-60 187 254
1
28.8 169.0 1.5 8.8 .60 52.3/52.3 60/60 50/50 221/221
208/230-3-60 187 254 17.3 123.0 1.5 5.8 .60 34.9/34.9 40/40 34/34 173/173
460-3-60 414 508 9.0 62.0 0.8 2.6 .30 17.4 20 17 87
575-3-60 518 632 7.1 50.0 0.8 2.6 .30 13.8 20 13 70
072
(6 Tons)
208/230-3-60 187 254
1
20.5 156.0 1.4 5.8 .60 38.8/38.8 45/45 37/37 205/205
460-3-60 414 508 9.6 75.0 0.6 2.6 .30 17.9 20 17 99
575-3-60 518 632 7.7 56.0 0.6 2.6 .30 14.3 20 14 75
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
UL — Underwriters’ Laboratories
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
POWER EXHAUST
PART NO.
MCA
(230 v)
MCA
(460 v)
MCA
(575 v)
MOCP
(for separate
power source)
CRPWREXH021A01 N/A 0.9 N/A 15
CRPWREXH022A01 3.3 N/A 1.32 15
CRPWREXH023A01 N/A 1.8 N/A 15
CRPWREXH028A01 1.7 N/A 0.68 15
CRPWREXH029A01 N/A 1.0 N/A 15
CRPWREXH030A01 1.6 N/A 0.64 15
7
457
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