York eco YCAS Series, Manual

Page: 69 / 232

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YORK INTERNATIONAL
FORM 201.18-NM9 (602)
NOTES (pages 66-67)
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/50 Hz = 4.1A.
ELECTRICAL NOTES (50 HZ)
TABLE 26 – FAN DATA (-46)
FAN TYPE
NOMINAL POWER FULL LOAD AMPS LOCKED ROTOR AMPS
(kW) (FLA) (LRA)
STANDARD 1.57 4.4 18.0
HIGH PRESSURE 3.7 6.8 46.3
TABLE 25 – COMPRESSOR DATA
MAXIMUM kW AND AMPERAGE VALUES FOR DXST COMPRESSORS
COMPRESSOR MODEL AND VOLTAGE CODE
DXS45LA – MOTOR CODE A DXS36LA – MOTOR CODE A DXS24LA – MOTOR CODE (TBD)
(B5N, B5E, B6N, B6E) (A5N, A5E, A6N, A6E) (C5N, C5E, C6N, C6E)
VOLTAGE CODE -17 -28 -40 -46 -50 -58 -17 -28 -40 -46 -50 -58 -17 -28 -40 -46 -50 -58
MAX KW 150 150 150 150 113 150 150 150 150 150 113 150 105 105 105 105 80 105
MAX AMPS 492 428 259 214 193 171 492 428 259 214 193 171 338 294 178 147 135 118
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