Bryant 579F User Manual page 166

UNIT NOMINAL
IFM TYPE
SIZE V-PH-Hz
208/230-1-60 STD
STD
208/230-3-60
HS
STD
048
460-3-60
(4 tons)
HS
STD
575-3-60 HS
Perfect Humidity
208/230-1-60 STD
STD
208/230-3-60
HS
STD
060
460-3-60
(5 tons)
HS
STD
575-3-60 HS
Perfect Humidity
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
UL — Underwriters' Laboratories
*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.
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.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%
PERFORMANCE DATA — 581C
581C048-060 UNITS
VOLTAGE
RANGE COMPRESSOR
Min Max QTY RLA
197 254 1 21
187 254 1 14.1
414 508 1 7.1
518 632 1 6.1
187 254 1 25
187 254 1 17.3
414 508 1 8.4
518 632 1 7.1
452 + 464 + 455
3
1371
=
3
= 457
7
457
COMBUSTION
OFM FAN MOTOR
LRA QTY FLA FLA
115 1 1.5 0.6
95 1 1.5 0.6
45 1 0.8 0.3
1 0.6
38 0.3†
1 0.8†
150 1 1.5 0.6
123 1 1.5 0.6
70 1 0.8 0.3†
1 0.6
53 0.3†
1 1.9†
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
POWER EXHAUST
PART NO.
CRPWREXH030A01
CRPWREXH021A01
CRPWREXH028A01
CRPWREXH029A01
* — 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.
166
CONV
IFM POWER SUPPLY *
OUTLET
MCA MOCP**
FLA
NO 32.7 40
4.9
YES 38.7 45
NO 24.0 30
4.9
YES 30.0 35
NO 24.9 30
5.8
YES 30.9 35
NO 11.9 15
2.2
YES 14.6 20
NO 12.3 15
2.6
YES 15.0 20
NO 10.1 15
1.9
YES 12.3 15
NO 10.2 15
2.0
YES 12.4 15
NO 10.3 15
2.6†
YES 12.5 15
NO 39.4 50
6.6
YES 45.4 60
NO 28.9 35
5.8
YES 34.9 40
NO 30.6 35
7.5
YES 36.6 40
NO 13.9 20
2.6
YES 16.6 20
NO 14.7 20
3.4
YES 17.4 20
NO 11.5 15
2.0
YES 13.6 15
NO 12.3 15
2.8
YES 14.4 20
NO 12.2 15
3.4†
YES 14.4 20
Application MCA MCA MCA
usage (230 v) (460 v) (575 v)
036-072 1.6 N/A
036-072 N/A 0.68
ALL* 1.7 N/A
ALL N/A 0.7
MINIMUM UNIT
DISCONNECT
SIZE
FLA LRA
31.5 130
37.0 135
23.6 110
29.1 115
24.6 140
30.1 145
11.6 53
14.1 55
12.1 67
14.6 70
9.9 44
11.9 46
10.0 51
12.0 52
10.1 56
12.1 58
38.1 187
43.6 191
28.3 168
33.8 173
30.2 187
35.8 192
13.6 92
16.1 95
14.5 102
17.0 104
11.2 66
13.2 67
12.1 75
14.1 76
12.0 79
14.0 80
MOCP
(for
separate
power
source)
0.64 15
N/A 15
0.68 15
N/A 15