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NOTES (pages 4 - 7)
1. MRA is Maximum Running Amps, the maximum continuous current at any operating point in the rating range. Also referred to as MCA,
or Minimum Circuit Ampacity to be provided by the installer. If a Factory Mounted Control Transformer is provided, add 3 amps to the
system #1 MCA values in the YCAS Tables.
2. The recommended disconnect switch is based on a minimum of 115% of the summation rated load amps of all the loads included in the
circuit, per N.E.C. 440 - 12A1.
3. Minimum recommended fuse size is based on 150% of the largest motor RLA plus 100% of the remaining RLAs. Minimum fuse rating
= (1.5 x largest compressor RLA) + other compressor RLAs + (# fans x each fan motor FLA).
4. Maximum dual element fuse size is based on 225% maximum plus 100% of the rated load amps for all other loads included in the circuit,
per N.E.C. 440-22. Maximum fuse rating = (2.25 x largest compressor RLA) + other compressor RLAs + (# fans x each fan motor FLA).
5. Minimum recommended circuit breaker is 150% maximum plus 100% of rated load amps included in the circuit. Minimum circuit breaker
rating = (1.5 x largest compressor RLA) + other compressor RLAs + (# fans x each fan motor FLA).
6. Maximum circuit breaker is based on 225% maximum plus 100% of the rated load amps for all loads included in the circuit, per circuit,
per U.L. 1995 Fig. 36.2. Maximum circuit breaker rating = (2.25 x largest compressor RLA) + other compressor RLAs + ( # fans x each
fan motor FLA).
7. The Incoming Wire Range is the minimum and maximum wire size that can be accommodated by unit wiring lugs. The (1), (2), or (3)
indicate the number of termination points or lugs which are available per phase. Actual wire size and number of wires per phase must
be determined based on ampacity and job requirements using N.E.C. wire sizing information. The above recommendations are based
on the National Electrical Code and using copper connectors only. Field wiring must also comply with local codes.
8. A ground lug is provided for each compressor system to accommodate field grounding conductor per N.E.C. Article 250-54. A control
circuit grounding lug is also supplied.
9. The field supplied disconnect is a "Disconnecting Means" as defined in N.E.C. 100.B, and is intended for isolating the unit from the
available power supply to perform maintenance and troubleshooting. This disconnect is not intended to be a Load Break Device.
10. Two-compressor machines with single-point power connection, and equipped with Star-Delta compressor motor start must also include
Factory provided circuit breakers in each motor control center.
11. Consult factory for Electrical Data on units equipped with "High Static Fan" option. 50Hz High Static Fans are 3.5kW each.
12. FLA for each "Low Noise Fan" motor: 380v/50Hz = 4.1A.
ACR-LINE
DE FU
DISC SW
FACT MOUNT CB
FACT MOUNT FUSE
MAX
MCA
MIN
MIN NF
S.P. WIRE
UNIT MTD SERV SW
WYE-DELTA
XLRA
YLRA
8
ELECTRICAL DATA
LEGEND
ACROSS THE LINE START
CB
CIRCUIT BREAKER
DUAL ELEMENT FUSE
DISCONNECT SWITCH
FACTORY-MOUNTED CIRCUIT BREAKER
FACTORY-MOUNTED FUSES
FLA
FULL LOAD AMPS
HZ
HERTZ
MAXIMUM
MINIMUM CIRCUIT AMPACITY
MINIMUM
MINIMUM NON-FUSED
RLA
RUNNING LOAD AMPS
SINGLE-POINT WIRING
UNIT-MOUNTED SERVICE (NON-FUSED DISCONNECT
SWITCH)
WYE-DELTA START
ACROSS-THE-LINE INRUSH LOCKED ROTOR AMPS
WYE-DELTA INRUSH LOCKED ROTOR AMPS
VOLTAGE CODE
50=380/415-3-50
YORK INTERNATIONAL
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