Carrier 50PG03-16 - Manual (Page 32)

32
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
NEC
− National Electrical Code
OFM − Outdoor−Fan Motor
RLA − Rated Load Amps
* Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or 480 v. If power distribu-
tion voltage to unit varies from rated heater voltage, heater kW will vary accordingly.
† Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equip-
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the
unit shall be fuse or HACR 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 percentage of voltage imbalance.
% Voltage Imbalance = 100 x
max voltage deviation from average voltage
average voltage
Example: Supply voltage is 460-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
224 + 231 + 226
3
681
3 =
227 =
Determine maximum deviation from average voltage.
(AB) 227 – 223 = 3 v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
4
227
= 1.76%
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.
3. Single point kits CRSINGLE028A00 and CRSINGLE030A00 are not required if
field−supplied pressure connectors are used.
Copyright 2006 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:50PG−16SI
Replaces: 50PG−13SI
Printed in U.S.A. Edition Date: 10/06
50PG03−16