Bryant DuraPac 558F Installation & Service Instructions Manual page 12

VOLTAGE
NOMINAL
RANGE
UNIT
VOLTAGE
558F
(3 Ph, 60 Hz)
Min Max RLA LRA RLA LRA RLA LRA Qty Hp
208/230 187 253
300
460 414 508
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
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v.
Heaters are rated at 240 v and 480 v. If power distribution voltage to unit varies
from rated heater voltage, heater kW will vary accordingly. To determine heater
capacity at actual unit voltage, multiply 240 v or 480 v capacity by multipliers
found in table in Note 4.
†Fuse or HACR circuit breaker.
**Electric heaters are field installed.
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 Canadian 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 of voltage
imbalance.
% Voltage 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 =
Table 2 — Electrical Data (cont)
COMPRESSOR
No. 1 No. 1A No. 2
20.7 156 20.7 156 47.1
10.0 75 10.0 75 19.6
452 + 464 + 455
3
1371
=
3
= 457
OFM IFM
FLA
Hp FLA
(ea)
245 6 0.5 1.7 10.0 28.0/28.0
125 6 0.5 0.8 10.0 14.6
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 voltage imbalance.
% Voltage Imbalance = 100 x
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. MCA calculation for 558F units with electric heaters over 50 kW = (1.25 x
IFM amps) + (1.00 x heater FLA).
4. Use the following table to determine heater capacity at actual voltage.
HEATER
RATING
VOLTAGE
240 0.694 0.751 0.918 1.000
480
EXAMPLE: 34 kW (at 230 v) heater on 208 v
= 34.0 (.751 mult factor)
= 25.5 kW capacity at 208 v.
— —
12
POWER ELECTRIC
EXHAUST HEAT*
FLA LRA kW FLA
— — — —
4.6 18.8 — —
— — 26/34 71/ 82
4.6 18.8 26/34 71/ 82
— — 42/56 117/135
4.6 18.8 42/56 117/135
— — 56/75 156/180
4.6 18.8 56/75 156/180
— — — —
2.3 6 — —
— — 32 39
2.3 6 32 39
— — 55 66
2.3 6 55 66
— — 80 96
2.3 6 80 96
7
457
= 1.53%
ACTUAL HEATER VOLTAGE
200 208 230 240 380
—
— — — — 0.626 0.840 0.918 1.000
POWER SUPPLY
MCA MOCP†
138/138 175/175
143/143 175/175
138/138 175/175
143/143 175/175
181/170 200/175
187/176 200/200
191/215 200/225
197/221 200/225
64 80
66 80
67 80
70 80
84 90
87 100
114 125
117 125
440 460 480
— — —