York LEU360, Техническое руководство

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550.13-TG2Y (1001)
Unitary Products Group 3
DESCRIPTION
Evaporator blower units are designed with two distinct mod-
ules to provide maximum application flexibility. The 30 and 40
ton units are shipped as single packages with the blower
module mounted on top of the coil module, The blower mod-
ule can be repositioned in the field to meet almost any instal-
lation requirement. Blower and coil modules for the 50 ton
units are shipped separately to simplify handling. These mod-
ules can be connected in the field with the same flexibility as
the smaller units.
The blower module includes the blower wheels and room for
a field-mounted motor and drive. The coil module includes
direct expansion coils, 1 in. throwaway filters, liquid line sole-
noid valves for both capacity reduction and pumpdown, ther-
mal expansion valves, distributors and a condensate drain
pan.
Every evaporator coil is pressurized with air to 325 psig and
leak tested under water. After the headers are brazed onto
the coil and the coil is installed in the unit, the coil is pressur-
ized with a combination of refrigerant-22 and nitrogen to 150
psig for pressure testing and additional leak testing. After the
coil is evacuated and dehydrated, it is pressurized with a
holding charge of refrigerant-22 for storage and/or shipping.
Steam coils, hot water coils, base sections, suspension hard-
ware, blower motors and drive packages are available as
field-installed accessories to provide additional application
flexibility.
These evaporator blowers, combined with condensing units,
provide years of quiet, efficient and dependable operation.
These units are manufactured under ISO 9001 Quality Sys-
tem Certification.
MODULAR DESIGN
These evaporator blowers can be arranged for a variety of air
discharge patterns in either the horizontal or the vertical posi-
tion.
The above illustration shows three of the common installation
arrangements. Refer to the unit installation instructions for
other possibilities.
Units may be bottom-supported or ceiling-suspended and
can be arranged to meet almost any space or duct require-
ments. Each unit is available with a choice of blower motors,
drive packages and other accessories to make them suitable
for most applications.
FACTORY-MOUNTED COMPONENTS
PART LOAD OPERATION These evaporator blowers 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 more even temper-
ature and humidity levels in the conditioned space.
EASY SERVICE Serviceable expansion valves are provided
on every unit. These superior valves are factory-installed to
provide many years of trouble-free operation. If service is
required, it is not necessary to unbraze any joints.
PUMPDOWN Evaporator blowers include a solenoid valve
for non-recycling pumpdown. When the cooling requirement
in the conditioned space is satisfied, the refrigerant is
pumped into the high side of the system.
ACCESSORIES
BASE SECTIONS (30 and 40 ton only) Base sections can
used to elevate units above the floor. If desired, outdoor air
may be introduced through these sections by cutting an
access opening to accommodate the outdoor air duct con-
nection. These bases have a durable finish to match the
evaporator blower unit. They may have to be insulated for
certain applications.
SUSPENSION PACKAGES These accessories can be used
to suspend horizontal units from above without interfering
with access to the unit. They can also be used for elevating a
floor-mounted unit (either horizontal or vertical) to provide
additional height for the installation of a trap at the conden-
sate drain connection. All suspension packages can be used
with vibration isolators.
HOT WATER COILS Drainable 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. 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 (LEU360 only) A steam coil is available on
the LEU360 for installation between the blower and coil mod-
FIGURE 1 : UNIT INSTALLATION