Technical Guide

505428-YTG-R-1114
Johnson Controls Unitary Products 5
Refer to the unit installation instructions for other application
possibilities.
Benefits
Air handling units are designed with two distinct modules to
provide maximum application flexibility. All are shipped as
single packages with the blower module mounted on top of
the coil module. The blower module can be repositioned in
the field to meet a large number of vertical and horizontal
applications.
The 7.5 thru 20 Ton blower module includes the blower
wheels along with factory-mounted motor and drive. The 25
Ton blower module includes the blower wheels with field
mounted motor and drives. All models offer two motor
horsepower options to meet both standard and high static
airflow requirements.
The coil module includes direct expansion coils, 2 in.
throwaway filters with the option to accept 4” filters, liquid line
solenoid valves for capacity reduction, thermal expansion
valves, distributors and a non-corrosive, composite
condensate drain pan.
Every air handling coil is pressurized with air and leak tested
under water. After the headers are brazed onto the coil and
the coil is installed in the unit, the coil is pressurized with
nitrogen for pressure testing and additional leak testing. After
the coil is evacuated and dehydrated, it is pressurized with a
holding charge of nitrogen for storage and/or shipping.
These air handlers, combined with condensing units, provide
years of quiet, efficient and dependable operation. These
units are manufactured under ISO 9001 Quality System
Certification.
Unit Installation
Units may be bottom-supported or ceiling-suspended and
can be arranged to meet almost any space or duct
requirements. Each unit is available with a choice of blower
motors horsepower and other accessories to make them
suitable for most applications.
Air Handling units are available in either two or four pipe
configurations from 7.5 to 25 tons. The dual and single circuit
options provide a wide variety of application and unit match-
up possibilities.
Blower Motors:
Different HP motors are available for each
unit to meet almost any air delivery requirement. All motors
are UL approved, have permanently lubricated ball bearings
and are mounted within the insulated cabinet of the units to
minimize the transmission of sound to the surrounding space.
1.5-5 HP motors are inherently protected. 7.5 HP motors
require motor overload protection.
Overload Relay (7.5HP):
These blower motors do not have
inherent protection and require external motor overload
protection. NC/ND240 "F" models Overload Relays are
factory installed. NC300 models Overload Relays are field
installed. Power wiring for blower motor is supplied in the
Overload Relay Kit. See details in Overload Relay Kit and
Overload Relay Setting Tables on Page 70.
Factory-Mounted Components
Part Load Operation:
These air handlers with DX (Direct
Expansion) coils rated at 10 tons of capacity and above have
multiple coils with pre-piped distributors, expansion valves
and solenoid valves. Field modifications are not required for
part load operations. Capacity reduction not only provides
economical operation, but also maintains stable temperature
and humidity levels in the conditioned space.
BAS Control:
Simplicity® SE with Communication Option
Control - The York® Simplicity® SE with Communication
Option Control is factory installed. It includes all the features
of the Simplicity® SE control with an additional gateway to
BACnet MS/TP (programmable to Modbus or N2 protocols).
Easy Service: Serviceable expansion valves are provided on
every unit. These valves are factory-installed to provide many
years of trouble-free operation. If service is required, it is not
necessary to unbraze any joints. The expansion valves also
include a tee fitting to allow easy installation of hot gas
bypass if required.
Coil Protection: The indoor coils of these air handlers can
have factory applied Technicoat or Electrofin coating to
provide extended life to the indoor coil in standard
applications and additional corrosion protection on those
applications in sea coast or corrosive environments.
Accessories
Base Sections:
Base sections can be used to elevate units
above the floor. If desired, a moderate percentage of outdoor
air may be introduced through these sections by cutting an
access opening to accommodate the outdoor air duct
connection. These bases include a durable finish to match
the evaporator blower unit. The base may have to be
insulated for certain applications.
Hot Water Coils:
Drain-able water coils are available for field
installation between the blower and the coil modules of both
horizontal and vertical units. Since their casings match the
dimensions and the finish of the basic units, they become an
integral part of the unit after installation. The coils slide out of
their casings for easy installation. Hot water coils have
copper tubes that have been mechanically expanded into
aluminum fins. Both headers are located on the same end of
the coil. Coils are leak-tested at 325 psig under water and
dried before their connections are capped for storage and
shipping.
Steam Coils:
Steam coils are available for installation
between the blower and coil modules of both horizontal and
vertical units. Since the casing matches the dimensions and
the finish of the basic unit, it becomes an integral part of the
unit after installation. The coil slides out of the casings for
easy installation and is pitched in the casings to facilitate
condensate drainage. The coil has copper tubes that have
been mechanically expanded into aluminum fins. Both
headers are located on the same end of the coil. The coil is
leak-tested at 325 psig and dried before the connections are
capped for storage and shipping.
Bottom Return:
Air handling unit can be quickly converted to
bottom return for both vertical and horizontal applications. All
that is required is the removal of several screws and a single