Description; Modular Design; Factory-Mounted Components; Accessories - York 480 Technical Manual

DESCRIPTION

Evaporator blower units are designed with two distinct mod-
ules to provide maximum application flexibility. The 25, 30
and 40 ton units 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 almost
any installation requirement. Blower and coil modules for the
50 ton units are shipped separately to simplify handling.
These modules 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, 2 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.
For Indoor Unit Installation details, please see document 035-
18496-000.

MODULAR DESIGN

These evaporator blowers can be arranged for a variety of air
discharge patterns in either the horizontal or vertical position.
FIGURE 2:

UNIT INSTALLATION

4
Figure 2 shows three of the common installation arrange-
ments. Refer to the unit installation instructions for other pos-
sibilities.
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.
PUMP-OUT Evaporator blowers include a solenoid valve for
non-recycling pump-out. When a cooling requirement in the
conditioned space is needed, the refrigerant is pumped into
the high side of the system before unit start-up.

ACCESSORIES

BASE SECTIONS (25, 30 and 40 ton only: Base sections
can be used to elevate units above the floor. If desired, out-
door 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.
036-21335-002-A-1102
Unitary Products Group