L&L Kiln: JUPITER JD230-3 KILN
3" BRICK, Digital Controller, CONE 10 KILN
The J230 L&L kiln is by far our most popular kiln.
It is the largest
Cone 10 kiln we make that
comes with a 50 amp cord.
Shown with the optional
- Internal Size: 22-3/8" diam x 27" high
- Cubic Feet: 6.67
- Number of Sections: Three
- Brick: 3" of premium select K23
- Elements: Heavy-duty elements are standard
- Max Temp: 2350F, 1287C, Cone 10
- Control Panel Mount: Plug-in, separate from kiln
- Control: DynaTrol with Dynamic Zone Control, 4 preset programs, 6 user defined programs
- Hinge: Easy-Lift, Easy-Load Hinge
- Stand: Full Support Aluminized stand
- Power Hook Up: 50 amp 6-50 Plug for single phase, 50 amp 15-50 plug for three phase
Large Cone 10 Kiln Options:
(two 20" diameter full shelves, four half shelves and one large square
post kit with six each 1/2", 1", 2", 4", 6", and 8" high square posts ,
5 lbs of cone 10 kiln wash, dark safety glasses and high temperature
gloves for loading).
- Vent-Sure Downdraft Vent:
- Pull-Apart System: No charge
- 120 Volt Control Supply/noise filter:
- Dawson Kiln Sitter Backup:
kilns with a wide variety of options. Sectional design and "Pull-Apart" Option make these perfect for sculptural pieces.Ask about our professional delivery and setup of kilns and other ceramics equipment.
Most Models Rated to Cone 10 - 2350oF - 1287oC
enough to fire stoneware and porcelain.The 18? high J23 and J2918 are
only rated to Cone 5 because of the greater percentage of unheated
surface area in the kiln (unless you get a powered bottom).
Dyna-Glow Ceramic Element Holders Protect Firebrick - Result in Much Longer Kiln Life
smooth ceramic holders take the worry out of changing your elements.
Look closely at other kilns and see if you want to change elements
embedded in the fragile firebrick. You?ll appreciate one of the main
features that makes L&L kilns so unique.
Choice of 2-1/2? or 3? Brick - Hardened With Special Facing
use the finest quality 2-1/2? or 3? thick firebrick.The brick is coated
with a proprietary reflective ceramic coating which penetrates, binds
and hardens the surface of the entire interior of the kiln. This
reduces brick dusting. It increases brick life, operating efficiency
and uniformity. Some other kiln manufacturers do this on the tops -
L&L does it on every brick as the kiln is being made.The shallow
cut required by the unique L&L Dyna-Glow element holders makes
brick even more energy efficient. See hotkilns.com/brickstudy.pdf for
brick energy comparison.
All Elements in Kiln Have the Same Resistance
element resistance values are the same in each kiln. No need to
carefully match elements when replacing elements. Our multi-zone
control on both manual and automatic kilns makes this possible.
Elements are Evenly Coiled
are coiled on a special automatic machine that puts the proper spacing
in the coil. Evenly spaced elements mean no hot spots and longer
element life. Replacement elements need very little stretching.
Standard or Optional Heavy- Duty Elements
heavy duty elements last longer under high fire and heavy use
conditions. Heavy-duty elements use thicker wire and have a lower watt
density (watts per square inch of element surface area). The lower the
watts density the cooler the elements can run and the longer they last.
Industrial Type Element Connections with Special Ceramic Blocks
are twisted around stainless steel screws mounted on solid ceramic
terminal blocks. All contact between elements and wire lugs is over a
wide surface of heavily torqued stainless steel washers. Changing
elements requires no special tools. The wire from cords is double
insulated with special high temperature sleeving to protect it from
UL / Canadian Listed
Jupiter kilns including manual, automatic, 2-1/2? brick, 3? brick,
single phase, three phase and those with powered bottoms are C-UL-us
listed. (See page 3). 480 and 380 volt kilns are not listed but are
made to National Electrical Code standards.
A Long and Fine Pedigree
kilns are based on the long and well respected Econo-Kiln line that
L&L has made for over 40 years.We have simply improved the line.
Easy to Move and Set Up
Jupiter kilns are made of easy to lift 9? high sections which quickly
plug into the control panel. Each section has two handles.You can
shrink the kiln size or increase it (depending on the control panel) by
removing or adding sections. (See hotkilns.com/section.pdf for more
Standard Thermocouples are Heavy-Duty 8 Gauge
standard thermocouples used for the JD Automatic kilns are exposed 8
gauge Type K thermocouples which are fine for low-fire applications.
Thermocouples are mounted away from the control panel. They are easy to
change. Element connection wire and all terminations are properly
calibrated for the thermocouples to keep them accurate.
Optional Industrial Mullite Protection Tubes
grade mullite ceramic thermocouple protection tubes are recommended
when doing high fires above Cone 1 (around 2000oF).Tested to over 130
Cone 10 firings. (See hotkilns.com/tc-protect.pdf).
Large 1? Diameter Peepholes with Solid Cast Ceramic Plugs
can really see! Peepholes are a full one inch diameter and are not
tapered.These large holes allow much greater visibility into the kiln
than is found in the tapered holes of most competitors? kilns. A solid
cast ceramic insulating plug is included.The plug includes a stepped
head on the end to prevent heat loss from the peephole. It is not as
fragile as the typical peephole plug used on competitors? kilns. Being
straight makes them hard to fall out of the peephole.
Galvannealed Stand Features Full Support for Bottom
Jupiter kiln stand has a full plate of reflective heavy 14 gauge
galvannealed steel under the bottom brick. This allows the bottom brick of this L&L kiln to move freely while expanding and contracting. It also provides better
support for the kiln so that cracked bottoms will no longer be a
problem. Multiple bends in stand tops and legs make stand extremely
strong. Legs include protective caps that allow the kiln to be slid
over a smooth floor. The VENT-SURE collection box mounts directly to
the underside of the stand on four welded studs. The reflective surface
under the kiln improves energy efficiency.
?Easy-Open, Easy-Load? Hinge Design and Lid Support Allows Easy Access to Kiln
new ?Easy-Open, Easy-Load? L&L hinge is counterbalanced with a
torsion spring.This lightens the weight of the lid making it easy to
open and close. A lighter lid also reduces lid and kiln lip damage. A
plunger type safety latch holds the lid in place while it is open. The
lid, when open, is tilted away from the kiln opening allowing greater
access to the interior. There are no lid supports in the way when
loading your kiln. You can safely and easily load from both sides.
Anyone who has tried to load a large kiln with a lot of work can fully
appreciate this great feature. The hinge extends over three kiln
sections and ties the kiln together for stability. This spring-loaded
hinge design is standard for the 29? diameter models and optional for
the 23? diameter models (add $100). It is not available on the 18?
diameter models. All kilns include supplemental safety chains that hook
to a wall as a precaution against accidental lid dropping.
Corrosion Resistant Case Materials
create corrosive conditions from heat and fumes. L&L kilns are
built to last in this tough environment.The case is stainless steel.
Screws are stainless steel. Galvannealed steel stand resists corrosion
at high temperatures. Hinge is either powder-coated galvannealed (the
springloaded hinge) or stainless steel (the standard hinge).
bottom can be very easily reversed in case of a firing mishap (except
for powered bottoms). Sectional construction of this large cone 10 kiln makes this possible.
Three Adjustable Case Clamps per Section
stainless steel case of each kiln section is held together by three
adjustable stainless steel clamps. Behind the clamps the stainless
steel case is reinforced with a piece of aluminized steel to prevent
distortion. The clamps of this large cone 10 kiln are easily accessible for adjustment. Two clamps
are used on lids and bottoms.
Stainless Steel Clips Hold Lid Brick in Place
manufacturers rely on the metal band around the kiln to hold the entire
weight of the firebrick. L&L screws on several stainless steel
clips that hold the firebrick in the band.
Optional Bottom Element
elements are available on all models except the J18 and J18X. This
improves heat up time and uniformity. It is recommended for heavy loads
(such as dense loads of tiles) or where speed of heat up is important.
Power is controlled on a separate zone.
Optional ?Pull-Apart? Kiln
few minor design changes make the Jupiter kilns easy to dismantle and
reassemble to solve unusual loading problems such as firing high
We offer a new variation in our Jupiter line, which is meant just for those people
who definitely want to assembly and dissemble their kilns often. This option consists of not putting a hinge on
the kiln at all, having four handles on the top, and mounting the control panel on a floor stand like we do on the
DaVinci control panels. The sections are not tied together. We provide 45? long cords on all the sections.
There is no charge for this option. The kiln sections easily plug into the panel. See photograph of a
JD245 (right) for an example.
Optional Unpowered 4-1/2? Sections
high unheated sections are available for slightly increasing kiln
height without adding power. These can adversely affect heat-up time,
maximum temperature and temperature uniformity so we don?t normally
recommend them but we do make them available.
Optional Powered VENT-SURE Kiln Vent
fumes to outside. Vent collection box mounts on the stand (see photo of
stands) for downdraft effect and better uniformity. The vent blower is
mounted on the wall rather than under the kiln to improve blower life
and environmental safety.
Built to Last - Easy to Maintain
kilns are designed from the ground up to be easy to maintain yourself
with no special tools. Dyna-Glow element holders and simple industrial
grade element terminations make changing elements the easiest of any
kiln.The hinged control box is easy to service and, moreover, can be
easily detached and sent for expert factory service. Our whole design
philosophy is to make a kiln that lasts like the production tool it is.
Service and Quality - Three Year Limited Warranty
anyone about L&L?s unsurpassed 60 year reputation for service and
quality products.We ship most parts from the factory in less than two
days. Call us, email us or visit the extensive support section on our
web site. See hotkilns.com/warranty.pdf.
Both Automatic & Manual Jupiters Feature Multi-Zone Design
you order a manual or an automatic control, every Jupiter kiln is
multi-zoned. Each 9? section (and optional powered bottom) has its own
separate contactor or manual infinite switch. In the case of the four
or five section automatic kilns the middle sections operate together as
one zone. For automatic kilns the optional powered bottom is tied into
the bottom zone.However, the DynaTrol allows you to adjust how much of
the bottom?s power is used (from 10% to 100%).
Detachable Panel With Protective Air Space
control panel is mounted away from kiln heat with air space in between
for reliable operation. Control, contactors and sensitive components
last longer. The control panel can easily be unplugged by anyone in
minutes and sent to the factory service center for quick expert repairs
(if ever necessary). The panel door is hinged and all wiring is neatly
laid out for easy maintenance.
Power Relays - Industrial Quality Wiring
all automatic Jupiter kilns and all larger manual kilns (all except
J18, J18X, J23 and J230 which use zone switches for power switching)
power is switched to the elements with sealed power relays.Wiring
connections are positive to stable components. All wiring is neatly
laid out and tie-wrapped. The instrument panel is well-ventilated.
Branch Fusing included on High Powered Kilns
Each element circuit or zone is separately fused on kilns with more than 50 amps.
Control Panels and Kilns are Carefully Tested
designed our own special testing device to put each automatic control
through a rigorous test before it ships. We actually simulate various
temperatures as we put a test program through its paces.We do a high
voltage pot test of each power circuit to test for shorts.We have a 28
point quality control checklist.
Power Cord for Smaller Single Phase Kilns
50 amp 6-50P six foot power cord is included for J18, J18X, J23, J23PB
and J230 single phase models. All other models feature a direct hook-up
power terminal block. The NEMA plug configuration we use is shown.
Automatic Jupiters Feature...
DynaTrol Is Integral Part Of Kiln Control
The DynaTrol with ?Dynamic Zone Control? replaces manual switches and
the Dawson kiln sitter/timer. Operation of the kiln, including zone
control for even firing, is completely automated. See
Dynamic Zone Control
Dynamic Zone Control automatically controls a top, middle and bottom
zone for accuracy better than 1/2 cone top to bottom. All our automatic
sectional kilns feature this - not just a select few - and you pay no
more for this feature. .
On/Off Switch and Control Fuse
An On/Off switch turns power off to the kiln when not using it. A
control fuse protects the control circuit. Some automatic kilns don?t
Optional Dawson Kiln Sitter/Timer for Back Up Safety
A Dawson kiln Sitter/Timer may be optionally ordered as a back up
safety device. This will shut off the L&L kiln in the event of a control malfunction.
Optional 120 Volt Control Power with Noise Filter
Some people have unstable power grids with a lot of electrical noise.
This option provides a separate 120 volt cord to supply power to the
control circuit. This goes through an EMF noise filter to reduce
electromagnetic noise to the control. You can plug this into a computer
UPS (Uninterruptible Power Supply) or other computer grade surge
protector for further protection. See hotkilns.com/noise.pdf.