WB8

WB Series Bell Lift Annealing / Pre-Heat Ovens For Glass And Steel 1500°F (815°C)

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LOCKED BY SERIES
Type Bell Lift
Power Source Electric
Loading Bell
Uniformity AMS Class 4 (± 20ºF / 10ºC)
Atmosphere Air
Lining Ceramic Fiber

Applications

LOCKED BY SERIES

Description

The WB Series furnace is designed for the purpose of annealing borosilicate glass although it may be used for other applications such as weld pre-heating and annealing. The heated furnace portion is a counterbalanced rectangular "bell" that lifts entirely out of the way when loading the furnace. The furnace features proprietary ceramic element holders for easy low cost replacement of elements and maximum element life, all low density ceramic fiber and mineral wool insulation and a completely digital programmable temperature control for automated cycling Maximum temperature is 1500°F (815°C.)


Processes


Markets

Specifications

Dimension
W
H
D
Inside
19
24
96
External
35.25
92.75
109.5
* All dimensions in inches unless otherwise specified.
Power
Standard Pwr 10
Max Temp (°F) 1500
* All power values in KW unless otherwise specified.
Weight
Ship Weight 2500
Max Load 1200
* All weights in Lbs unless otherwise specified.


Additional Features

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 solid state power contactors. Power circuits are fused. Customer must connect fused power supply to single point on panel.
DIGITAL HONEYWELL UDC 3200 PID PROGRAM TEMPERATURE CONTROL
The standard control is a Honeywell UDC 3200 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. The controls are fully calibrated and the control system completely tested. A complete instruction manual includes easy start up instructions, theory of operation, maintenance instructions, parts list, general dimension drawing, general assembly and subassembly drawings where required, and a detailed trouble shooting guide. A ladder logic diagram and panel layout are prepared on CAD for easy readability.
WARRANTY
The furnace is warranted for one year except for elements and thermocouples which are warranted for six months. See warranty sheet Q12W.
SHIPPING
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.
STAINLESS STEEL INTERIOR
The entire interior is made of stainless steel for heat and corrosion resistance. The liner is designed to expand and contract with the heat.
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.
NICKEL-CHROME ELEMENTS
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.
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 (60" wide 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 enamel.

Additional Options

CONTROL, RECORDER AND ELECTRICAL OPTIONS
CONTROL, RECORDER AND ELECTRICAL OPTIONS
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.
JIC CONTROL OPTION
This includes a NEMA 12 control cabinet, all oil tight switches and a panel mounted fused disconnect switch. Zone switches if included are percentage timers.
OVERTEMPERATURE SYSTEM
Honeywell UDC 1200 digital high limit back up control with manual reset, back up contactors and separate thermocouple.
POWER LIFT
A gear motor lifts the furnace up and down. Limit switches are included. Works from switches on the control panel.
SINGLE ZONE SCR POWER CONTROLLER
A zero fired SCR power control with two-leg control is used instead of contactors. This is constructed with transient voltage protection, sub-cycle fuse protection, extra large heat sinks, and positive zero firing. Gain and bias adjustments are included for tuning.

Downloads

Brochure For WB