97 performance data (cont), Electric heating capacities, Multiplication factors – Bryant DURAPAC 551B User Manual
Page 97
97
PERFORMANCE DATA (cont)
ELECTRIC HEATING CAPACITIES
*Two heater packages required to provide kW indicated.
†009 for 551B102 units.
**On units with factory-installed outlet, use CRSINGLE014A00.
NOTES:
1. The kW ratings shown above are at 240, 480, and 600 v. Use the Multiplica-
tion Factors table below to determine heater capacity for your particular
voltage.
MULTIPLICATION FACTORS
Example: 32.0 kW (at 240 v) heater on 208 v
= 32.0 (.75 mult factor)
= 24.0 kW capacity at 208 v
2. Heaters are not available for size 036-072 575-v units.
LEGEND AND NOTES FOR ELECTRICAL DATA TABLES
LEGEND
*Used to determine minimum disconnect per NEC.
†Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v or 575 v.
If power distribution voltage to unit varies form rated heater voltage, heater kW
will vary accordingly.
**Fuse or HACR circuit breaker per NEC.
††Units have 2 condenser-fan motors.
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.
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 ImbalanceExample: Supply voltage is 460-3-60.
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.
% 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.
3. Non-fused disconnect switch cannot be used when rooftop unit electrical
ratings exceed 80 amps.
4. 575-v units have UL, Canada approval only. Electric heaters are not avail-
able for 036-072, 575-v units.
UNIT
551B
VOLTAGE
(60 Hz)
ACCESSORY
kW
ACCESSORY
HEATER
PART NUMBER
CRHEATER---A00
ACCESSORY
SINGLE POINT BOX
PART NO.
CRSINGLE---A00
036
208/230
(single
phase)
4.4
101
—
6.5
102
—
8.7
103
—
10.5
104
—
13.0*
102*
004
208/230
(3 phase)
4.4
101
—
6.5
102
—
8.7
103
—
10.5
104
—
16.0
105
—
460
(3 phase)
6.0
106
—
8.8
107
—
11.5
108
—
14.0
109
—
048
208/230
(single
phase)
4.4
101
—
8.7
103
—
13.0*
102*
004
17.4*
103*
004
21.0*
104*
004
208/230
(3 phase)
6.5
102
—
8.7
103
—
16.0
105
—
21.0*
104*
002
460
(3 phase)
6.0
106
—
11.5
108
—
14.0
109
—
23.0*
108*
—
060
208/230
(single
phase)
6.5
102
—
8.7
103
—
13.0*
102*
004
17.4*
103*
004
21.0*
104*
004
208/230
(3 phase)
6.5
102
—
10.5
104
—
16.0
105
—
21.0*
104*
002
26.5*
105,104
002
460
(3 phase)
6.0
106
—
11.5
108
—
14.0
109
—
23.0*
108*
—
25.5*
109,108
—
072
208/230
(3 phase)
6.5
102
—
10.5
104
—
16.0
105
—
21.0*
104*
002
26.5*
105,104
002
460
(3 phase)
6.0
106
—
11.5
108
—
14.0
109
—
23.0*
108*
—
25.5*
109,108
—
UNIT
551B
VOLTAGE
(60 Hz)
ACCESSORY
kW
ACCESSORY
HEATER
PART NUMBER
CRHEATER---A00
ACCESSORY
SINGLE POINT BOX
PART NO.
CRSINGLE---A00
090,
102
208/230
(3 phase)
10.5
117
006
16.0
110
006
24.8
111
007
32.0
112
007
42.4*
112,117
007†
460
(3 phase)
14.0
116
006
16.5
113
006
27.8
114
006
33.0
115
006
41.7*
114,116
008
575
(3 phase)
17.0
118
006
34.0
119
006
120,
150
208/230
(3 phase)
10.5
117
012
16.0
110
012
32.0
112
012
42.4*
112,117
015
50.0*
112,110
015
460
(3 phase)
16.5
113
011
27.8
114
011
33.0
115
011**
41.7*
114,116
014
50.0*
115,113
014
575
(3 phase)
17.0
118
011
34.0
119
011
51.0*
119,118
014
HEATER kW
RATING
VOLTAGE DISTRIBUTION
V/3/60
MULTIPLICATION
FACTOR
240
200
208
230
240
.69
.75
.92
1.00
480
440
460
480
.84
.92
1.00
600
550
575
600
.84
.92
1.00
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
7
457
0TF
Q
0
04-
01
2
5
5
1
B
03
6-
15
0