Johnson Controls YORK Tempo YLAA Series, Installation Operation & Maintenance

Page: 53 / 192

FORM 150.72-NM1 (1020)
53
JOHNSON CONTROLS
55
ELECTRICAL 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 certi-
fied and maximum size is based on 225% of the
rated load amps for the largest motor plus 100% of
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
-17 = 200-3-60
-28 = 230-3-60
-40 = 380-3-60
-46 = 460-3-60
-50 = 380/415-3-50
-58 = 575-3-60
VOLTAGE CODE
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 Electri-
cal Code, using copper connectors only . Field
wiring must also comply with local codes.
7. A ground lug is provided for each compressor sys-
tem to accommodate a field grounding conductor
per N.E.C. Table 250-95. A control circuit ground-
ing lug is also supplied.
8. The supplied disconnect is a “Disconnecting
Means” as defined in the N.E.C. 100, and is in -
tended for isolating the unit for the available power
supply to perform maintenance and troubleshoot-
ing. This disconnect is not intended to be a Load
Break Device.
9. Field Wiring by others which complies to the Na-
tional Electrical Code and Local Codes.