68
Legend and Notes for Tables P-X.
LEGEND
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. 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 per-
centage of voltage imbalance.
% Voltage Imbalance:
Example: Supply voltage is 230-3-60
Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.
NOTE: Check all factory and field electrical connections for tightness.
Table R — 50KC**06 (5 Tons) Cooling
v-Ph-Hz
UNIT VOLTAGE COMP 1 OFM (ea) IFM
RANGE
RLA LRA WATTS FLA TYPE
EFF at Full
Load
FLA
MIN MAX
208-1-60 187 253 25.0 134
325 1.4 DD-STD 78% 7.4
325 1.4 MED 76% 7.0
230-1-60 187 253 25.0 134
325 1.4 DD-STD 78% 7.4
325 1.4 MED 76% 7.0
208-3-60 187 253 15.9 110
325 1.4 DD-STD 78% 7.4
325 1.4 MED 89% 8.4
325 1.4 HIGH 89% 8.4
230-3-60 187 253 15.9 110
325 1.4 DD-STD 78% 7.4
325 1.4 MED 89% 8.3
325 1.4 HIGH 89% 8.3
460-3-60 414 506 7.0 52
325 0.9 DD-STD 78% 4.0
325 0.9 MED 89% 4.2
325 0.9 HIGH 89% 4.2
575-3-60 518 633 5.1 40
325 0.9 DD-STD 78% 4.0
325 0.9 MED 77% 2.8
325 0.9 HIGH 77% 2.8
BRKR — Circuit breaker
C.O. — Convenience outlet
DISC — Disconnect
FLA — Full load amps
IFM — Indoor fan motor
LRA — Locked rotor amps
MCA — Minimum circuit amps
P.E. — Power exhaust
pwrd fr/ unit — Powered from unit
PWRD C.O. — Powered convenience outlet
UNPWR C.O. — Unpowered convenience outlet
= 100 x
max voltage deviation from average voltage
average voltage
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
(224 + 231 + 226)
=
681
= 227
33
% Voltage Imbalance = 100x
4
=1.78%
227
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
A
B
C
MOTOR
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