Bryant 581C User Manual
Page 166
166
PERFORMANCE DATA — 581C
581C048-060 UNITS
LEGEND
*The values listed in this table do not include power exhaust. See table at right
for power exhaust requirements.
**Fuse or HACR circuit breaker.
†460v motor
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 volt-
age 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%.
POWER EXHAUST ELECTRICAL DATA
* — Single or three phase rooftop unit
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.
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—5 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
NOMINAL
V-PH-Hz
IFM TYPE
VOLTAGE
RANGE COMPRESSOR
OFM
COMBUSTION
FAN MOTOR
IFM
CONV
OUTLET
POWER SUPPLY *
MINIMUM UNIT
DISCONNECT
SIZE
Min Max QTY
RLA LRA
QTY
FLA
FLA
FLA
MCA MOCP**
FLA LRA
048
(4 tons)
208/230-1-60
STD
197
254
1
21
115
1
1.5
0.6
4.9
NO
32.7
40
31.5
130
YES
38.7
45
37.0
135
208/230-3-60
STD
187
254
1
14.1
95
1
1.5
0.6
4.9
NO
24.0
30
23.6
110
YES
30.0
35
29.1
115
HS
5.8
NO
24.9
30
24.6
140
YES
30.9
35
30.1
145
460-3-60
STD
414
508
1
7.1
45
1
0.8
0.3
2.2
NO
11.9
15
11.6
53
YES
14.6
20
14.1
55
HS
2.6
NO
12.3
15
12.1
67
YES
15.0
20
14.6
70
575-3-60
STD
518
632
1
6.1
38
1
0.6
0.3†
1.9
NO
10.1
15
9.9
44
YES
12.3
15
11.9
46
HS
2.0
NO
10.2
15
10.0
51
YES
12.4
15
12.0
52
Perfect Humidity
1
0.8†
2.6†
NO
10.3
15
10.1
56
YES
12.5
15
12.1
58
060
(5 tons)
208/230-1-60
STD
187
254
1
25
150
1
1.5
0.6
6.6
NO
39.4
50
38.1
187
YES
45.4
60
43.6
191
208/230-3-60
STD
187
254
1
17.3
123
1
1.5
0.6
5.8
NO
28.9
35
28.3
168
YES
34.9
40
33.8
173
HS
7.5
NO
30.6
35
30.2
187
YES
36.6
40
35.8
192
460-3-60
STD
414
508
1
8.4
70
1
0.8
0.3†
2.6
NO
13.9
20
13.6
92
YES
16.6
20
16.1
95
HS
3.4
NO
14.7
20
14.5
102
YES
17.4
20
17.0
104
575-3-60
STD
518
632
1
7.1
53
1
0.6
0.3†
2.0
NO
11.5
15
11.2
66
YES
13.6
15
13.2
67
HS
2.8
NO
12.3
15
12.1
75
YES
14.4
20
14.1
76
Perfect Humidity
1
1.9†
3.4†
NO
12.2
15
12.0
79
YES
14.4
20
14.0
80
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
= 457
% Voltage Imbalance = 100 x
7
457
= 1.53%
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact
your local electric utility company immediately.
POWER EXHAUST
PART NO.
Application
usage
MCA
(230 v)
MCA
(460 v)
MCA
(575 v)
MOCP
(for
separate
power
source)
CRPWREXH030A01
036-072
1.6
N/A
0.64
15
CRPWREXH021A01
036-072
N/A
0.68
N/A
15
CRPWREXH028A01
ALL*
1.7
N/A
0.68
15
CRPWREXH029A01
ALL
N/A
0.7
N/A
15