Payne PA1P048 Installation & Start-Up Instructions page 14

LEGEND
FLA -- Full L oad A mps
LRA -- Locked Rotor Amps
MCA -- Minimum CircuitAmps
MOCP - - Maximum Overcurrent Protection
RLA -- Rated Load A mps
CKT BKR -- Circuit Breaker
US
NOTES:
1. tn compliance with NEC (National Electrical Code) requirements
for multimotor and combination load equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse. Canadian units may be
fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. tf other than
60 C wire is used, or if length exceeds wire length in table,
determine size from NEC.
3. Unbalanced 3-Phase Supply 'Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
% Vottage imbalance
= 100 x max voltage deviation from average voltage
average voltage
EXAMPLE: Supply voltage is 460-3-60.
A B C AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
452 + 464 + 455
3
1371
3
= 457
Determine maximum deviation from average 'voltage.
(AB) 457 452=5v
(BC) 464 457=7v
(AC) 457 455=2v
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: tf the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
C99024
HIGHVOLTAGE
1
POWER LEADS <_o- -
(SEE UNIT WIRING|
LABEL)
L_- -
CONTROLBOX
LOW-VOLTAGE _ ......
POWER LEADS-
(SEE UNIT
WIRING LABEL)
SPLICE BOX
o-i
J
_[:_,' • - POWER
°[[suPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
YF--LL_L _ Q
RE D_R± _ .
BRN(C_) _
THERMOSTAT
(TYPICAL)
LEGEND
Field ControFVottage Wiring
Field High-Voltage Wiring
NOTE: Use blue wire for 3-phase units only.
Fig, 10--High- and Control-Voltage Connections
C99010
]4