Electrical Notes - York YLAA0285SE Manual

Air-cooled scroll chillers with microchannel condenser coils style a (50 hz) 57 - 142 ton

Table of Contents

SECTION 5 – TECHNICAL DATA

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 the optional Factory

Mounted Control Transformer is provided, add the following MCA values to the electrical tables for the system

providing power to the transformer: -17, add 2.5 amps; -28, add 2.3 amps; -40, add 1.5 amps, -46, add 1.3 amps;

-58, add 1 amps.

2. The minimum recommended disconnect switch is based on 115% of the rated load amps for all loads included

in the circuit, per N.E.C. Article 440.

3. Minimum fuse size is based upon 150% of the rated load amps for the largest motor plus 100% of the rated load

amps for all other loads included in the circuit to avoid nuisance trips at start-up due to lock rotor amps. It is not

recommended in applications where brown outs, frequent starting and stopping of the unit, and/or operation at

ambient temperatures in excess of 95ºF (35ºC) is anticipated.

4. Maximum fuse size is based upon 225% 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 440-22.

5. Circuit breakers must be UL listed and CSA certified and maximum size is based on 225% of the rated load

amps for the largest motor plus 100% of the rated load amps for all other loads included in the circuit. Otherwise,

HACR-type circuit breakers must be used. Maximum HACR circuit breaker rating is based on 225% of the rated

load amps for the largest motor plus 100% of the rated load amps for all other loads included in the circuit.

6. The "INCOMING WIRE RANGE" is the minimum and maximum wire size that can be accommodated by the

unit wiring lugs. The (2) preceding the wire range indicates the number of termination points available per phase

of the wire range specified. Actual wire size and number of wires per phase must be determined based on the

National Electrical Code, using copper connectors only. Field wiring must also comply with local codes.

7. A ground lug is provided for each compressor system to accommodate a field grounding conductor per N.E.C.

Table 250-95. A control circuit grounding lug is also supplied.

8. The supplied disconnect is a "Disconnecting Means" as defined in the N.E.C. 100, and is intended for isolating the

unit for the available power supply to perform maintenance and troubleshooting. This disconnect is not intended

to be a Load Break Device.

9. Field Wiring by others which complies to the National Electrical Code & Local Codes.

LEGEND

ACR-LINE

C.B.

D.E.

DISC SW

FACT MOUNT CB

FLA

MAX

MCA

MIN

MIN NF

RLA

S.P. WIRE

UNIT MTD SERV SW

LRA