Carrier 50JZ024 Installation, Start-Up And Service Instructions Manual page 13

LEGEND
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM — Indoor-Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
(fuses or HACR-type circuit breaker)
NEC — National Electrical Code
OFM — Outdoor-Fan Motor
RLA — Rated Load Amps
UL — Underwriters Laboratories
* Single-Point Wiring Connections.
† Dual-Point Wiring Connections.
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 UL, Canada, 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
C
O
R
G
Y
E
W2
THERMOSTAT UNIT CONTROL POWER
AND SUBBASE
Fig. 16—Control Connections
GROUND
LEAD
SINGLE-PHASE
L1
CONNECTIONS
TO DISCONNECT
L2
PER NEC
L3
3-PHASE
CONNECTIONS
NOTE: Use copper wire only.
LEGEND
NEC – National Electrical Code
Field Wiring
Splice Connections
Fig. 17—Line Power Connections
Fig. 15—Electrical Data Legend
BRN
ORN
RED
GRN
YEL
WHT
SPLICE BOX
C99056
GROUND LUG
(IN SLPICE BOX)
BLK
YEL
BLU
C99057
13
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 457
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.
7
% Voltage Imbalance = 100 x
457
= 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.
®
24 V Circuit Breaker
24 Volt Compartment
Fig. 18—Control Wiring Plate
C99051
C99070