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56 SSP-PRC002-EN
Air Handlers
General
Air handler units shall be completely
factory assembled including coil,
condensate drain pan, fan motor(s),
filters, and controls in an insulated
casing that can be applied in either
vertical or horizontal configuration. Unit
shall be rated and tested in accordance
with ARI standard 210/240 or 340/360.
Unit shall be UL listed and labeled in
accordance with UL 1995 for indoor
blower coil units.
Casing
Unit casing shall be constructed of zinc
coated, heavy gauge, galvanized steel.
Exterior surfaces shall be cleaned,
phosphatized, and finished with a
weather-resistant baked enamel finish.
Casing shall be completely insulated
with cleanable, foil faced, fire-retardant,
permanent, odorless, glass fiber
material. All insulation edges shall be
either captured or sealed. Knockouts
shall be provided for unit electrical
power and refrigerant piping
connections. Captive screws shall be
standard on all access panels.
Refrigeration System
The TWE050A, TWE075A, TWE10 0A units
shall have a single refrigeration circuit
and the TWE10 0B, TWE155B, TWE200B
units shall have dual refrigeration
circuits. Each refrigeration circuit is
controlled by a factory installed thermal
expansion valve.
Evaporator Coil
Configured aluminum fin surface shall
be mechanically bonded to 3/8" (10 mm)
Condenser Coil Guard — Metal grille
with PVC coating shall be provided to
alleviate coil damage.
Black Epoxy Coated Condenser Coil —
This factory installed option is designed
to provide corrosion protection of air
cooled condenser coils for seacoast
application. The black epoxy coil
protection is a factory applied thermoset
vinyl coating, bonded to normal
aluminum fin stock. The uniform
thickness of the bonded vinyl layer
exhibits excellent corrosion protection in
salt spray tests performed in accordance
with ASTM B177.
internally enhanced copper tubing and
shall be factory pressure and leak tested
at 375 psig (2586 kPa). Coil is arranged
for draw-through airflow and shall
provide a double sloped condensate
drain pan constructed of PVC plastic. The
drain pan shall be removable for
cleaning. The condensate drain pan can
be installed in any of four positions
allowing for vertical or horizontal
application and providing external
connections on either side of the unit.
Evaporator Fan
Double inlet, double width, forward
curved, centrifugal-type fan(s) with
adjustable belt drive shall be standard.
Thermal overload protection shall be
standard on motor. Fan and motor
bearings shall be permanently
lubricated. Oversized motors shall be
available as an option for high static
application. All indoor fan motors meet
the U.S. Energy Policy Act of 1992
(EPACT).
Controls
Magnetic evaporator fan contactor, low
voltage terminal strip, check valve(s), and
single point power entry shall be
included. All necessary controls shall be
factory-installed and wired. Evaporator
defrost control shall be included to
prevent compressor slugging by
temporarily interrupting compressor
operation when low evaporator coil
temperatures are encountered.
Filters
One inch, throw-away filters shall be
standard on TWE050A, TWE075A,
TWE100A and TWE120B model air
handlers. Filters shall be accessible from
the side coil access panel. Filter rack can
be field converted to two inch capability.
Two inch, throw-away filters shall be
standard on TWE155B and TWE20 0B
models.
ACCESSORIES
Electric Heaters — UL and CSA
approved electric heat modules shall be
available for installation directly on fan
discharge. Electric heaters shall be
available in a wide range of capacities
with one or two stage control, single-
point electric power connection, and
terminal strip connections. Electric
heater elements shall be constructed of
heavy-duty nickel chromium elements
internally wye connected on 400 volt,
three phase. Each 400 volt heater shall
have automatic line break high limit
controls.
Discharge Plenums and Grilles —
Accessory discharge plenums shall be
available for vertical, free discharge
applications. Plenums shall be
constructed of heavy-gauge, zinc coated,
galvanized steel finished with baked
enamel to match the air handler unit.
Grilles shall be satin finished aluminum
and have four-way adjustable louvers.
Return Air Grilles — Accessory return air
grille shall be provided for vertical front,
free return applications. Grilles shall be
installed in place of the front lower side
panel. Grille shall be satin finished
aluminum with non-adjustable louvers.
Mounting Subbase — The accessory
shall be available for vertical floor mount
configurations. Subbase shall be
constructed of heavy gauge, zinc coated,
galvanized steel with baked enamel
finish to match air handler unit. Subbase
is required in the vertical air flow
application for condensate drain
trapping and when isolators are
required.
Vibration Isolators — This accessory
shall reduce transmission of noise and
vibration to building structures,
equipment, and adjacent spaces.
Packages shall be available in either
neoprene-in shear or spring-flex types in
floor or suspended mountings.
Oversized Motors — Field installed
oversized motors shall be available for
high static pressure applications.
CONTROL OPTIONS
Standard Indoor Thermostats — Two
stage heating and cooling operation or
one stage heating and cooling
thermostats shall be available in either
manual or automatic changeover.
Programmable Electronic Night Setback
Thermostat — The option shall provide
heating setback and cooling setup with 7-
day programming capability.
Outdoor Thermostat — This option
shall provide staging control of
electric heaters based on a set
outdoor temperature.
Mechanical
Specifications