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General
All units shall be factory assembled,
piped, internally wired and fully charged
with refrigerant. All units shall be de-
signed to operate at outdoor ambient
temperatures as high as 115°F. Cooling
capacities shall be rated in accordance
with A.H.R.I. standards. The 4DCY4 heat-
ing/cooling unit design is certified to UL
Standards 1995 and ANSI 221.47/CSA
2.3, specifically for outdoor applications
using natural gas or propane
shall be designed for outdoor rooftop or
ground level installation. Unit casing is
constructed of heavy gauge, galvanized
steel and painted with a weather-resistant
powder paint.
Shipped for horizontal application,
convertible to downflow.
Casings
All panels shall be heavy gauge steel,
gasketed and insulated. Foil-faced
insulation shall be in the heat exchanger
section. Foil-faced insulation shall be in
the evaporator section. Base pan shall be
heavy gauge steel. WEATHERGUARD™
exterior corrosion resistant screws shall
be used for added resistance to rust and
corrosion.
Controls
Refrigeration cycle controls shall include
condenser fan, evaporator fan and com-
pressor contactors. Compressors shall
be equipped with a combination internal
winding thermostat/current overload.
Internal high pressure relief shall also be
provided.
Refrigeration System
Compressors —
The Climatuff
compressor features in-
®
ternal over temperature and pressure pro-
tector, total dipped hermetic motor. Other
features include: centrifugal oil pump, and
low vibration and noise.
Evaporator Coil — Internally enhanced
3/8-inch OD seamless copper tubing
me chani cally bonded to aluminum fins,
factory pressure and leak tested at 250
to 300 psig. All units have TXV to control
refrigeration flow.
6200 Troup Highway
Tyler, TX 75707-9010
Mechanical Specifications
Condenser Coil —
The Spine Fin™ condenser coil shall be
continuously wrapped, corrosion resistant
all aluminum with minimum brazed joints.
This coil is 3/8 inch OD seamless alumi-
num tubing glued to a continuous alumi-
num fin. Coils are lab tested to withstand
2,000 pounds of pressure per square
inch. The outdoor coil provides low airflow
resistance and efficient heat transfer.
The coil is protected on all four sides by
All units
louvered panels.
.
Indoor Air Fan — Direct-drive, forward-
curved, centrifugal wheel in a Composite
Vortica
Blower housing. Motor shall
®
have thermal overload protection. Perma-
nently lubricated motor bearings. Motor/
blower assembly isolated from unit with
rubber mounts.
Condenser Fan — Direct-drive, draw
through propeller type. Weather-proofed
permanent split capacitor fan motor shall
have built-in thermal overload and perma-
nently lubricated motor bearings.
Low Ambient — Standard refrigerant
system operation down to 55°F. Low am-
bient accessory required for operation to
0°F ambient condition.
Gas-Fired Heating System — Models
shall provide completely assembled,
wired and piped gas fired heating systems
within unit. Threaded gas connection on
the unit.
Electronic Ignition System — Main
burner is lit each time thermostat calls for
gas heat. Flame sensor proves flame and
keeps the main burners on. Should a loss
of flame occur, the main valve closes and
the spark recurs within 0.8 second. When
thermostat is satisfied, main burner is
extinguished.
Forced Combustion Blower — Insures
flame stability under varying wind condi-
tions. Gives higher combustion efficiency
and location flexibility.
10/14
The manufacturer has a policy of continuous product and product data improvement and it reserves the right
to change design and specifications without notice.
Heat Exchanger — stainless steel
tubes. Free floating design.
Burners — Stainless steel. Multi-port
inshot.
Accessories
(U.S. Domestic Models)
Roof Curb — The roof curb shall
be designed to mate with the unit
and provide support and complete
weather-tight installation when properly
installed. Curb shall ship knocked down
for field assembly, and include wood
nailer strips.
Modulating Economizer — This
accessory shall be field installed and
be composed of the following items:
0-100% fresh air damper, damper
drive motor fixed dry bulb enthalpy
control, and low voltage polarized plug
for electrical connections. Solid state
enthalpy or differential enthalpy control
is optional. Economizer operations shall
be controlled by the preset position
of the enthalpy control. A barometic
relief damper shall be standard with
the economizer and provide a pressure
operated damper that shall be gravity
closing and prohibit entrance of outside
air on equipment "off" cycle.
Manual Fresh Air Hood
Manual outside air provides a fixed out-
side air quantity from 0 to 25 percent.
Includes hood and birdscreen.
Low Ambient Control
Control allows cycling of compressor
under low ambient cooling conditions.
Required for cooling operation to 0°F.
Propane Gas
Conversion Kit — For conversion from
natural gas to LP gas.
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