Johnson Controls 100 Series User Manual

JOHNSON CONTROLS
33
SECTION 2 – INSTALLATION
FORM 100.50-NOM12
ISSUE DATE: 04/02/2019
2
POWER WIRING
Field wiring to the unit must conform to provisions
of National Electrical Code (NEC) ANSI / NFPA 70
latest edition and / or local ordinances. The unit must
be electrically grounded in accordance with the NEC
and / or local codes. Voltage tolerances, which must be
maintained during starting and running conditions, are
indicated on the unit data plate.
The internal wiring harnesses furnished with this unit
are an integral part of the design certified unit. Field
alteration to comply with electrical codes should not
be required. If any of the wire supplied with the unit
must be replaced, replacement wire must be of the type
shown on the wiring diagram and the same minimum
gauge as the replaced wire.
Power supply to the unit must be NEC Class 1 and must
comply with all applicable codes. A disconnect switch
must be provided (factory option available). The switch
must be separate from all other circuits. Wire entry at
knockout openings requires conduit fittings to comply
with NEC and/or Local Codes.
Refer to Figure 9 on page 34, Figure 10 on page
35, and Figure 11 on page 36 for typical field wir-
ing and to the appropriate unit wiring diagram mounted
inside control doors for control circuit and power wir-
ing information.
Field power wiring connected to the in-
coming power termination point must be
copper conductor only. Aluminum wire
cannot be connected to the incoming
power termination point.
ELECTRICAL SERVICE SIZING
Electrical service is required for the cooling-only Pack-
aged Rooftop Unit; use the appropriate calculations
listed below from U.L. 1995. Based on the operating
mode and configuration of the rooftop, the calculations
will yield different MCA (minimum circuit ampacity),
and MOP (maximum overcurrent protection). MCA
and Overcurrent Protection Device Data is supplied
on the unit data plate.
The following calculations apply to electrical data for
the rooftop unit. All concurrent load conditions must
be considered in the calculations, and you must use the
highest value for any combination of loads.
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 includ-
ed in the circuit, per N.E.C. Article 440-34.
The minimum recommended disconnect switch is
based on 115% of the rated load amps for all loads in-
cluded in the circuit, per N.E.C.
Maximum overcurrent protection 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. If
the maximum overcurrent protection does not equal a
standard current rating of an overcurrent protective de-
vice, then the marked maximum rating is to be the next
lower standard rating. However, if the device selected
for maximum overcurrent protection is less than the
MCA, then select the lowest standard maximum fuse
size greater than or equal to the MCA.
Figure 9 on page 34, Figure 10 on page 35, and
Figure 11 on page 36 show the power wiring that
must be field supplied and installed.
For dual point power connections, TB1 in the power
panel supplies the all unit compressors and condenser
fans. TB2 in the power panel supplies power to the unit
supply, return and exhaust fans, and control circuitry.
All wiring must conform to the National
Electrical Code (NEC) and local codes
that may be in addition to NEC.

Johnson Controls 100 Series Specifications

General

Brand	Johnson Controls
Model	100 Series
Category	Air Conditioner
Language	English