Electrical Notes And Legend - York YCWL0056SE Installation Operation & Maintenance

Water-cooled liquid chillers

Table of Contents

FORM 201.26-NM1

ISSUE DATE: 1/19/2018

ACR

C.B.

D.E.

DISC SW

FACT MOUNT CB

FLA

MAX

MCA

MIN

MIN NF

RLA

S.P. WIRE

UNIT MTD SERV SW

LRA

ECWT

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 43024. If the optional Factory Mounted Control Transformer is provided, add the follow-

ing 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. MCA for units with optional external compressor overloads is calculated at 54/44 evaporator (water), 85/95 condenser (water) condition per

UL1995. If unit is to be operated at higher temperatures, increase Service Wiring and Equipment accordingly.

For Leaving Condenser Temperatures above 95°F (with maximum limit of 110°F) use the following formula:

RMCA = MCA * (1 + (DLCT - 95)/100 )

DLCT is "Design Leaving Condenser Temperature"

RMCA is "Recommended Minimum Circuit Ampacity"

3. 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.

4. 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 startup 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.

5. 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.

6. 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, an 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.

7. The "INCOMING WIRE RANGE" is the minimum and maximum wire size that can be accommodated by the unit wiring lugs. The (2) preced-

ing 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.

8. An equipment ground lug(s) is provided for the incoming power. Ground line sizing shall be in accordance with the current NEC Table 250-

122.

9. 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.

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

11. Voltage Utilization Range

JOHNSON CONTROLS