Bryant Gas Heating/Electric Cooling Units 581B User Manual
Page 12
Table 3B — Electrical Data (Units with Electrical Convenience Outlet)
UNIT
581B
NOMINAL
VOLTAGE
(V-Ph-Hz)
VOLTAGE
RANGE
COMPRESSOR
OFM
IFM
COMBUSTION
FAN MOTOR
POWER SUPPLY
WITH OUTLET
MINIMUM UNIT
DISCONNECT
SIZE*
Min
Max
RLA
LRA
FLA
FLA
FLA
MCA
MOCP†
FLA
LRA
036
(3 Tons)
208/230-1-60
187
254
16.0
88.0
0.7
4.9
.57
31.6/31.66
40/40
30/30
106/106
208/230-3-60
187
254
10.3
77.0
0.7
4.9
.57
24.5/24.5
30/30
24/24
95/ 95
460-3-60
414
508
5.1
39.0
0.4
2.2
.30
14.6
20
14
59
575-3-60
518
632
4.2
31.0
0.4
2.2
.30
11.5
15
11
47
048
(4 Tons)
208/230-1-60
187
254
23.7
129.0
0.7
4.9
.57
41.2/41.2
50/50
39/39
147/147
208/230-3-60
187
254
13.5
99.0
0.7
4.9
.57
28.5/28.5
35/35
28/28
117/117
460-3-60
414
508
7.4
49.5
0.4
2.2
.30
14.6
20
14
59
575-3-60
518
632
5.8
40.0
0.4
2.2
.30
11.5
15
11
47
060
(5 Tons)
208/230-1-60
187
254
28.8
169.0
1.5
8.8
.57
52.3/52.3
60/60
51/51
221/221
208/230-3-60
187
254
17.3
123.0
1.5
5.8
.57
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
61
072
(6 Tons)
208/230-3-60
187
254
20.5
156.0
1.4
5.8
.57
38.8/38.8
45/45
35/35
205/205
460-3-60
414
508
9.6
70.0
0.6
2.6
.30
17.9
20
17
95
575-3-60
518
632
7.7
56.0
0.6
2.6
.30
14.4
20
14
75
LEGEND
CUL
— Canadian Underwriters’ Laboratories
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 combina-
tion load equipment (refer to NEC Articles 430 and 440), the over-
current protective device for the unit shall be fuse or HACR breaker.
The CUL 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-
age of voltage imbalance.
max voltage deviation
from average voltage
% Voltage Imbalance = 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 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 percentage of voltage imbalance:
7
% Voltage Imbalance = 100 x
457
= 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.
3. 575-v units are CUL approved only.
Control Voltage Connections
Install a factory-approved room thermostat. See Table 4. Lo-
cate the thermostat on an inside wall in the space to be con-
ditioned where it will not be subjected to either a cooling or
heating source or direct exposure to sunlight. Mount the ther-
mostat 4 to 5 ft above the floor.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals through connector on unit to low-
voltage connections (shown in Fig. 14).
Connect thermostat wires to matching screw terminals of low-
voltage connection board. See Fig. 14.
NOTE:
For wire runs up to 50 ft, use no. 18 AWG insulated
wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insu-
lated wire (35 C minimum). For 75 to 155 ft, use no. 14 AWG
insulated wire (35 C minimum). All wire larger than no. 18
AWG cannot be directly connected to the thermostat and will
require a junction box and splice at the thermostat.
Pass control wires through the hole provided in the corner
post; then feed wires through the raceway built into the cor-
ner post to the 24-v barrier located on the left side of the con-
trol box. See Fig. 15. The raceway provides the UL required
clearance between high- and low-voltage wiring.
Connect thermostat wires to pigtails of low-voltage circuit in
low-voltage section on control box using wirenuts.
Table 4 — Thermostat List*
TYPE
Manual Changeover (Standard)
2 Heat/2 Cool
Auto. Changeover (Standard)
2 Heat/2 Cool
Manual Changeover (Electronic Setback)
2 Heat/2 Cool
Auto. Changeover (Electronic Setback)
2 Heat/2 Cool
*See Trade Prices for part numbers.
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