The elements are coiled nickel-chrome 80-20 alloy. A high watt density is
used for long element life. Elements are rated to 2100F (1100C.)
CERAMIC ELEMENT HOLDERS
The elements are supported in proprietary ceramic element holders located on
all four sides of the furnace. The holders are supported in grooved slots in the ceramic
fiber board hot face. These provide perfect support for the coiled element as well as
excellent radiating characteristics. The elements are completely exposed to the air which
allows the element surface temperature to stay relatively cool (as opposed to embedded
type elements.) The smooth surface prevents premature failure of the elements as they
expand and contract. Element replacement is easy: elements just lift out of the holders
without affecting the fiber hot face.
EFFICIENT MULTILAYERED INSULATION
The furnace is insulated with 1-1/2 of low K factor ceramic fiber board
as the primary insulation. This is backed up by 2 of very low K factor mineral wool
board on the sides and 4 on top. This extremely efficient insulation will heat up
and cool down quickly. The fiber board sections are available completely shaped for easy
replacement without cementing. No asbestos or vermiculite is used.
COUNTERBALANCED BELL LIFT CONSTRUCTION
The furnace is a rectangular bell that lifts vertically from the rigid base.
The bell is supported by two heavy channels from the back, leaving the entire hearth area
exposed without obstruction for easy loading. The furnace section is counterbalanced in
the rear. Eight roller bearings insure smooth operation. On larger units (WB 5 and above)
a hand crank is included as standard for easy raising and lowering. A counterbalance
allows top to be stopped in any position. A manual safety pin allows furnace t op to be
fixed in the top position. The base is heavy duty 10 gauge construction with square tube
structural legs. The furnace casing is 14 gauge steel. The entire case is primed with 800F
silicone paint (which will prevent corrosion at high temperatures) and finished in machine
CERAMIC FIBER HEARTH
The hearth is layered with two 1 inch layers of ceramic fiber blanket. This
is soft and provides an excellent working surface for delicate glass. The fiber blanket
layers are easily and economically replaced if damaged.
EASY TO VIEW CONTROL PANEL
All contactors and controls are located in a NEMA 1 panel mounted under the
furnace to save floor space. The panel is angled up so that the operator can view it while
standing. It can be adjusted in and out to suit customer. Power control is with mercury
power contactors. Power circuits are fused. Customer must connect fused power supply to
single point on panel.
UDC 3000 PROGRAM CONTROL SYSTEM
The standard control is a Honeywell UDC 3000 program control with 6 ramps and
6 soaks. A Type K thermocouple is encased in an inconel sheath and mounted from
underneath. This thermocouple will withstand mechanical abuse because of the alloy
sheathing. Thermocouple is rated to 2200F (1200C.) A limit switch turns off power to the
furnace when top is up.
TESTING AND INSTRUCTIONS
The furnace is power tested to insure proper watt ratings. A complete
instruction manual includes easy start up instructions, theory of operation, maintenance
instructions, parts list, and a detailed trouble shooting guide. A ladder logic wiring
diagram and panel layout are prepared on CAD for easy readability.
The furnace is warranted for one year.
The furnace is shipped completely assembled (including the counterbalance.)
This saves time when installing the unit. The unit can be disassembled to fit through a
32 by 6 foot door.
- OVERTEMPERATURE SYSTEM: Honeywell UDC 2000 digital high limit
back up control with manual reset, back up contactors and separate thermocouple element.
The back up contactors will prevent overfiring even if the primary contactors fail for any
- FIREBRICK BOTTOMS AND LOAD OPTIONS: The bottom can be made from
4-1/2" thick 2300F firebrick for heavier hearth loading. Stands, racks, rollers can
all be quoted.
- POWER LIFT: A gear motor lifts the furnace up and down. Limit
switches are included. Works from switches on the control panel.
- SCR POWER CONTROL: For very even temperature control, longer
element life, and totally quiet operation.