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Installation
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 Factory Mounted Control
Transformer is provided, add the following to the system MCA values in the electrical tables: -50, add 1.75 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 95°F 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 U.L. 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. Exception:
YCUL0045 and YCUL0061 must have the optional factory overloads installed to use a standard circuit breaker.
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.
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 and Local Codes.
LEGEND
ACR-LINE
ACROSS THE LINE START
C.B.
CIRCUIT BREAKER
D.E.
DUAL ELEMENT FUSE
DISC SW
DISCONNECT SWITCH
FACT MOUNT CB
FACTORY MOUNTED CIRCUIT BREAKER
FLA
FULL LOAD AMPS
HZ
HERTZ
MAX
MAXIMUM
MCA
MINIMUM CIRCUIT AMPACITY
MIN
MINIMUM
MIN NF
MINIMUM NON FUSED
RLA
RATED LOAD AMPS
S.P. WIRE
SINGLE POINT WIRING
UNIT MTD SERV SW
UNIT MOUNTED SERVICE (NON-FUSED
DISCONNECT SWITCH)
LRA
LOCKED ROTOR AMPS
24
ELECTRICAL NOTES
VOLTAGE CODE
-50 = 380-415 / 3 / 50
YORK INTERNATIONAL
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