Electrical Notes - York YCAS0130EC Manual

Air-cooled screw liquid chillers

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User manual (28 pages)

User manual (104 pages)

Table Of Contents

Table of Contents

NOTES & LEGEND

LEGEND

ACR-LINE

ACROSS THE LINE START

C.B.

CIRCUIT BREAKER

D.E.

DUAL ELEMENT FUSE

DISC SW

DISCONNECT SWITCH

FACT CB

FACTORY-MOUNTED CIRCUIT BREAKER

FLA

FULL LOAD AMPS

HERTZ

MAX

MAXIMUM

MCA

MINIMUM CIRCUIT AMPACITY

MIN

MINIMUM

MIN NF

MINIMUM NON-FUSED

RLA

RUNNING LOAD AMPS

S.P. WIRE

SINGLE-POINT WIRING

Y-∆

WYE-DELTA START

X-LRA

ACROSS-THE-LINE INRUSH LOCKED ROTOR AMPS

Y-LRA

WYE-DELTA INRUSH LOCKED ROTOR AMPS

CONTROL POWER SUPPLY (UNITS WITHOUT STANDARD CONTROL CIRCUIT TRANSFORMER)

NO. OF

COMPRESSORS

NOTES:

1. Minimum circuit ampacity (MCA) is based on 125% of the rated load amps for the largest motor plus 100% of the rated load amps for all

other loads included in the circuit, per N.E.C. Article 430-24. If a Factory Mounted Control Transformer is pro vid ed, add the following to the

system #1 MCA values in the YCAS Tables: -17, add 15 amps; -28, add 12 amps; -40, add 7 amps; -46, add 6 amps; -58, add 5 amps.

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 com pres sor 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 Electric

Code and using copper conductors only. Field wiring must also comply with local codes.

8. A ground lug is provided for each compressor system to accommodate ﬁ eld grounding conductor per N.E.C. Article 250-54. A control circuit

grounding lug is also supplied. Incoming ground wire range is #6 - 350 MCM.

9. The ﬁ eld supplied disconnect is a "Disconnecting Means" as deﬁ ned 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 (Wye)-Delta Compressor motor start must also include

factory-provided individual system circuit breakers in each motor control center. All 3 & 4 Compressor machines equipped with Star-Delta

com pres sor motor start must also include factory-provided individual system circuit breakers in each motor control center.

11. Consult factory for Electrical Data on units equipped with "High Static Fan" option. High Static Fans are 3.8 kW each.

12. FLA for "Low Noise Fan" motors: 200V = 8.0A, 230V = 7.8A, 380V = 4.4A, 460V = 3.6A, 575V = 2.9A.

13. Group Rated breaker must be HACR type for cU.L. Machines.