Fig. 15—Electrical Data Legend
C99051
452=5v
457=7v
455=2v
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.
2.
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.
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
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 457
Determine maximum deviation from average voltage.
(AB) 457 -
(BC) 464 -
(AC) 457 -
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.
®
Fig. 16—Control Connections
C99056
Y
C
W2
E
G
R
O
THERMOSTAT
AND SUBBASE
UNIT CONTROL POWER
SPLICE BOX
BRN
WHT
YEL
GRN
RED
ORN
Fig. 17—Line Power Connections
C99057
GROUND LUG
(IN SLPICE BOX)
BLU
YEL
BLK
GROUND
LEAD
SINGLE-PHASE
CONNECTIONS
TO DISCONNECT
PER NEC
3-PHASE
CONNECTIONS
LEGEND
NEC – National Electrical Code
Field Wiring
Splice Connections
NOTE: Use copper wire only.
L1
L3
L2
Fig. 18—Control Wiring Plate
C99070
24 V Circuit Breaker
24 Volt Compartment
13
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