Carrier 50KC04-06 Service And Maintenance Instructions page 68

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