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ELECTRICAL DATA
ELECTRICAL DATA — 551A155,180
LEGEND
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 380 v, 480 v, and 575 v. Heat-
ers are rated at 240 v, 480 v, or 575 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, 480 v, or 575 v capacity by multipliers found in table on page 150.
†Fuse or HACR circuit breaker.
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
EXAMPLE: Supply voltage is 460-3-60.
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.
= 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. MCA calculation for 551A155,180 units with electric heaters over 50 kW = (1.25 x IFM
amps) + (1.00 x heater FLA).
UNIT
551A
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
VO LTAGE
RANGE
COMPRESSOR
OFM IFM
POWER
EXHAUST
ELECTRIC
HEAT*
POWER SUPPLY
No. 1 No. 2
Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†
155
(Standard
IFM)
208/230 187 253 20.7 156 19.3 123 3 0.5 1.7 2.9
8.8/
8.4
—— — — 59/ 59 70/ 70
4.6 18.8 ——64/ 63 80/ 80
——14/19 39/ 45 60/ 67 70/ 70
4.6 18.8 14/19 39/ 45 66/ 73 80/ 80
——26/34 71/ 82 100/113 100/125
4.6 18.8 26/34 71/ 82 106/119 110/125
——42/56 117/135 157/146 175/175
4.6 18.8 42/56 117/135 163/151 175/175
460 414 508 10 70 10 62 3 0.5 0.8 2.9 4.2
—— — — 29 35
2.3 6.0 —— 31 40
—— 15 18 29 35
2.3 6.0 15 18 31 40
—— 32 39 54 60
2.3 6.0 32 39 57 60
—— 55 66 71 80
2.3 6.0 55 66 74 80
155
(Optional
IFM)
208/230 187 253 20.7 156 19.3 123 3 0.5 1.7 3.7
11.0/
10.5
—— — — 61/ 61 80/ 80
4.6 18.8 ——65/ 66 80/ 80
——14/19 39/ 45 62/ 70 80/ 80
4.6 18.8 14/19 39/ 45 68/ 76 80/ 80
——26/34 71/ 82 102/116 110/125
4.6 18.8 26/34 71/ 82 108/122 110/125
——42/56 117/135 159/149 175/175
4.6 18.8 42/56 117/135 165/155 175/175
460 414 508 10 70 10 62 3 0.5 0.8 3.7 4.8
—— — — 30 35
2.3 6.0 —— 32 40
—— 15 18 30 35
2.3 6.0 15 18 32 40
—— 32 39 55 60
2.3 6.0 32 39 58 60
—— 55 66 72 80
2.3 6.0 55 66 75 80
180
208/230 187 253 32.1 195 20.7 156 3 0.5 1.7 5.0
15.8/
15.8
—— — — 82/ 82 110/110
4.6 18.8 ——86/ 86 110/110
——26/34 71/ 82 109/122 110/125
4.6 18.8 26/34 71/ 82 114/128 125/150
——42/56 117/135 166/155 175/175
4.6 18.8 42/56 117/135 172/161 175/175
——56/75 156/180 176/200 200/225
4.6 18.8 56/75 156/180 182/206 200/225
460 414 508 16.4 95 10 70 3 0.5 0.8 5.0 7.9
—— — — 41 50
2.3 6.0 —— 43 50
—— 32 39 59 60
2.3 6.0 32 39 62 70
—— 55 66 76 90
2.3 6.0 55 66 79 90
—— 80 96 106 125
2.3 6.0 80 96 109 125
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
= 100 x
max voltage deviation from average voltage
average voltage
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
452 + 464 + 455
3
=
1371
3
= 457
% Voltage Imbalance = 100 x
7
457
0TFQ004-012
551A155-180