LEGEND AND NOTES FOR TABLES 4A AND 4B
| LEGEND |
FLA | — Full Load Amps |
HACR | — Heating, Air Conditioning and Refrigeration |
IFM | — Indoor (Evaporator) Fan Motor |
LRA | — Locked Rotor Amps |
MCA | — Minimum Circuit Amps |
MOCP | — Maximum Overcurrent Protection |
NEC | — National Electrical Code |
OFM | — Outdoor (Condenser) Fan Motor |
RLA | — Rated Load Amps |
*Fuse or HACR circuit breaker.
NOTES:
1.In compliance with NEC requirements for multimotor and com- bination load equipment (refer to NEC Articles 430 and 440), the overcurrent 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 volt- age is greater than 2%. Use the following formula to determine the percent voltage imbalance.
%Voltage Imbalance
=100 x max voltage deviation from average voltage average voltage
| TOP HOOD |
| SECTION |
SEAL | HOOD |
STRIP | SIDE |
LOCATION |
|
BOTTOM |
|
HOOD |
|
SECTION |
|
FILTER
GUIDE
FILTER
RETAINER
FILTER
MANUAL
DAMPER
(IF EQUIPPED)
NOTE: Units with manual damper only use one filter.
EXAMPLE: Supply voltage is
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 - 452 = 5 v
(BC) 464 - 457 = 7 v (AC) 457 - 455 = 2 v
Maximum deviation is 7 v.
Determine percent 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 the local electric utility company immediately.
3.The convenience outlet full load amps (FLA) are 5, 3, and 3 for 208/230, 460,
ADD
SEAL
STRIP
ADD
SEAL
STRIP INNER
FILTER
TRACK
ADD
SEAL
STRIP
ADD
SEAL
STRIP
FILTER
GUIDE
HOOD
SIDE
UNIT
BACK
PANEL
Fig. 18 — Outdoor-Air Hood Details
15