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NT Series 410-C Bulletin 410-C
60 Hertz
®
Q
UALITY
I
NNOVATION
S
ERVICE
International
Institute of
Ammonia Refrigeration
AN
EM
PL
OYE
E OWNED COMPANY 2
Corporate Headquarters, Taneytown, MD
S
ince its founding in 1976, EVAPCO,
Inc. has become a world-wide leader
in supplying quality equipment to
the Industrial Refrigeration HVAC and Process
Cooling Industries.
EVAPCOs success has been the result of a con-
tinual commitment to product improvement,
quality workmanship and a dedication to pro-
viding unparalleled service.
An emphasis on research and development
has lead to many product innovations a hall-
mark of EVAPCO through the years.
The ongoing R & D Program enables
EVAPCO to provide the most advanced prod-
ucts in the industry technology for the
future, available today.
EVAPCO I
NNOVATION
,
P
ERFORMANCE
, E
XPERIENCE
In 1993, EVAPCO introduced a full line
of industrial air evaporators. Each evap-
orator incorporates the unique and
patented Thermal-Pak
®
Finned Coil
design the result of a comprehensive
research and development program
started in the early 1990s. The Thermal-Pak
®
Finned Coil is just one exam-
ple of the commitment EVAPCO has made to research and development.
With over 25 industry related U.S. patents and their foreign counter-
parts, EVAPCOs engineering expertise speaks for itself and continues to
pioneer new, innovative product designs and features for the future.
A
DVANCED
T
ECHNOLOGY
A
VAILABLE
T
ODAY
The EVAPCO Research & Development Center, located at the Corporate
Headquarters in Taneytown, MD has
over 40,000 square feet dedicated
to research and product develop-
ment. Experienced R & D Engineers
perform product and application
research year round in four environ-
mental test chambers.
The Research Center features the industrys largest low temperature,
insulated environmental test chamber. The conditions in the test cham-
ber are controlled by a fully functional ammonia refrigeration system
designed to operate at suction
temperatures as low as -40° F.
EVAPCO is committed to provid-
ing the most innovative products
to meet todays stringent applica-
tion needs and has dedicated the
necessary resources to provide
that technology today.
©2001 EVAPCO, INC. 3
EVAPCO
E
VAPORATORS
Featuring the Exclusive
Thermal-Pak
®
Finned Coil
Cover
ed by U.S. Patent No. 5,425,414
I
NNOVATIVE
F
EATURES
Elliptical Tube
The unique elliptical tube is the largest nominal
diameter tube (1.05 in.) in the industry and features
the heaviest wall thickness at 0.060 nominal inches
increasing coil life. The elliptical shape of each tube
and its orientation in the finned bundle minimizes the
tube profile and reduces the air-side pressure drop
allowing for less fan horsepower while increasing heat
transfer efficiency.
Delta Design
The Delta Design signifies the Thermal-Pak
®
Finned
Coils equilateral triangle tube geometry and tube
center spacing. The elliptical shape allows for tubes to
be spaced closer together than other coils providing
more tube surface in a given plan area. The Delta
Design and large diameter elliptical tube combine to
provide more primary (tube) surface area, more
efficient secondary (fin) surface area for greater
overall capacity and faster defrosts.
Rippled Fin
The rippled fin provides greater air turbulence and
contact with all heat transfer surfaces within the
finned bundle and minimizes air bypass. As evapora-
tor heat transfer is primarily accomplished through
convection, improved air contact with the tubes and
fins increases heat transfer efficiency and overall
thermal capacity.
Crimped Edge
The Thermal-Pak
®
Finned Coil incorporates a crimped
edge on both the air entering and leaving side of
the coil. The crimped edge provides rigidity to the
fin to withstand the temperatures and stress relief
experienced during the galvanizing process. The end
result is a uniform fin spacing pattern before and
after galvanizing which improves air entry and exit.
Clean Tube and Fin Pattern
Each element above combined with a continuous fin
sheet through the coil results in EVAPCOs Clean Tube
and Fin Pattern. The continuous fin sheet eliminates
internal seams, which in other designs collects dirt,
bacteria, and frost leading to reduced coil perform-
ance and cleanability. The consistent fin configuration
provided by the crimped edge allows for more
uniform frost build patterns, even air flow distribution
across the face of the coil, and reduced maintenance
time (easier to clean). Other coils suffer from inconsis-
tent fin spacing leading to frost bridging, higher air
pressure drops, and particulate entrapment for
reduced capacity and increased maintenance.
Proven performance resulting in: Lower Horsepower Greater Capacity Compact Design Thermal Performance Guaranteed. Highest Tube-to-Fin Surface Area Ratio
in the Industry for Increased Efficiency
and Quicker Defrosts. 0.060 Inch Tube Wall Thickness for
Increased Coil Life, (Up to 90% Greater
Wall Thickness Than Other
Manufacturers). Entire Coil Designed to Meet the
Strength Requirements of ASME/ANSI
B31.5. Pressure Tested Under Water to
350 PSIG. Charged with Nitrogen Prior to
Shipment to Prevent Entry of Moisture
and Contamination. Improved Clean Tube and Fin Pattern
Ideal for Food Freezing Applications. CRN Coil Design Available in all
Canadian Provinces Fans
Direct drive axial fans are constructed of steel sheet metal for the NTW and NTX
models and cast aluminum for the NTM, NTL, and NTP models. Fans screens are
heavy gauge PVC coated steel, which conform to OSHA standards. NTC models
feature heavy-duty galvanized steel forward curved centrifugal fan blower
wheels mounted to a rugged tubular steel fan shaft with forged journal ends.
The NTC fan shaft is supported by heavy-duty self-aligning bearings.
4
S
TANDARD
C
ONSTRUCTION
F
EATURES
Heat Transfer Coil
All EVAPCO evaporators feature the
patented Thermal-Pak
®
Finned Coil
inside. The coil is constructed with
elliptically shaped steel tubes staggered
and pitched in the direction of air-flow
in an equilateral triangle geometry. A
heavy 0.060 nominal thick steel tube
has been incorporated for maximum
strength and longevity with steel fins
all hot dipped galvanized after fabrication. Coils are available in 3,
4 or 6 fins per inch and 4, 6, 8, or 10 rows deep. Coils can be
arranged for liquid recirculated, flooded, or thermal expansion
feed for ammonia or halocarbon refrigerants. All coils are charged
with nitrogen for shipment.
Motors / Electrical Wiring
All evaporators are supplied with totally enclosed air over
motors (TEAO) with sealed bearings and low temperature
grease (if required). NTW and NTX models feature fractional
horsepower motors ranging from 1/4 to 3/4 horsepower are
230/460 volt, three phase, 1140 rpm with automatic thermal overload (ATO) protection
built in. Fractional horsepower motors are mounted and supported by the fan screen.
The motor junction box for each motor is easily accessible for field wiring.
Drain Pan
All drain pans are constructed of G235 mill galvanized steel inside and out for maximum
corrosion protection and are insulated with a minimum two inch thick closed cell polyurethane
foam insulation as standard. All drain pans are sloped end to end with a bottom outlet drain to
insure complete drainage. Type 304 stainless steel is available as an option for the outer pan
cover, and is standard on all NTW style units. All standard pans are shipped mounted.
Unit Casing
The unit casing is constructed with heavy gauge, G235 mill galvanized steel the
heaviest galvanized specification in the industry for maximum corrosion protection.
The fan panel is a spun venturi-type orifice designed for maximum fan efficiency
and reduced air pressure drop. Fan cells are individually segmented to prevent air
bypass or reverse fan cycling and allow for independent fan operation. Type 304
stainless steel is available as an option, and is standard on all NTW style units.
NTC centrifugal fan units feature motors ranging from 1 to 50
horsepower, 230/460 volt, three phase and 1750 rpm. The
motor is mounted on a unique motor base designed for easy
belt tensioning. The motor is located inside the unit casing to
eliminate cumbersome belt guards and facilitate unit clean-
ing. The motor is factory pre-wired to a NEMA 4X junction
box located on the unit exterior.
NTM, NTL, and NTP
models include motors
ranging from 1 to 7.5
horsepower, 230/460
volt, three phase and
available in 870, 1160, or
1750 rpm. Fan motors
are supported by a heavy-duty pipe motor
mount with a fully welded heavy gauge sheet
metal base plate to reduce vibration and mini-
mize air pressure drop. Each motor is pre-
wired through the fan panel to a NEMA 4X
junction box mounted on the unit exterior for
easy access to field wiring. 5
Air Discharge Arrangements
(Galvanized or Stainless Steel)
Long throw adapters NTM and NTL models
45 Degree down-blow NTM and NTL models
90 Degree down-blow NTM, NTL, and NTC models
1,2,3, or 4 way discharge distribution plenum NTP models
Single or bi-directional discharge louvers NTM, NTL, NTC, NTP models
Materials of Construction
Type 304 stainless steel drain pan cover with galvanized steel unit housing and inner pan
Type 304 stainless steel unit housing and drain pan cover with galvanized inner pan
Aluminum tube / aluminum fin heat transfer coil
Easyclean construction For NTW models only (without hot gas drain pan)
Unit with Series flow Hot Gas
Coil and Pan
90° Downblow Penthouse Unit
Long Throw Ada