JOHNSON CONTROLS
42
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 2 – INSTALLATION
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 fit-
tings to comply with NEC and/or Local Codes.
Refer to
,
for typical field wir-
ing and to the appropriate unit wiring diagram mounted
inside control doors for control circuit and power wir-
ing information.
ELECTRICAL SERVICE SIZING
Electrical service required for the cooling only YORK
YPAL rooftop, 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.
Also refer to
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.
,
and
show the power wiring that
must be field supplied and installed. See
for the allowable conductor wire size for the
electrical lugs in the unit.
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.
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