FORM 150.66-NM1 (708)
55
JOHNSON CONTROLS
6
ELECTRICAL NOTES AND LEGEND
VOLTAGE CODE
-17 = 200-3-60
-28 = 230-3-60
-40 = 380-3-60
-46 = 460-3-60
-58 = 575-3-60
Field Wiring
Factory Wiring
LEGEND:
1. Minimum Circuit Ampacity (MCA) is based on 125% of the rated load amps for the larg est motor plus 100% of
the rated load amps for all other loads included in the cir cuit, per N.E.C. Article 430-24. If the optional Factory
Mount ed 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 amp.
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 nui sance trips at start-up due to lock rotor amps. It is not
recommended in ap pli ca tions where brown outs, frequent starting and stopping of the unit, and/or op er a tion at
am bi ent 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 certifi ed 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. Oth er wise, 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 ac com mo dat ed by the
unit wiring lugs. The (2) preceding the wire range indicates the number of termination points available per phase
of the wire range specifi ed. Actual wire size and number of wires per phase must be determined based on the
National Elec tri cal Code,
using copper connectors only
. Field wiring must also comply with lo cal codes.
7. A ground lug is provided for each compressor system to accommodate a fi eld ground ing 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 defi ned in the N.E.C. 100, and is in tend ed for isolating the
unit for the available power supply to perform main te nance and troubleshooting. This disconnect is not intended
to be a Load Break De vice.
9. Field Wiring by others which complies with the National Electrical Code & Local Codes.
NOTES:
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