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SILICON CARBIDE HEATING ELEMENTS
Silicon carbide heating elements are mounted over and under the hearth for even heating. All element connections are on the sides. Watt density is between 30 and 39. Elements are rated for 3000F (1650C).
FLOOR STANDING CASE CONSTRUCTION
The case is reinforced 10 gauge and 3/16” sheet steel with an integrated floor stand and lifting rings. The entire case is primed with 800F silicone paint and finished in machine enamel.
MULTILAYERED INSULATION; CERAMIC FIBER ROOF AND DOOR PLUG
There is 4-1/2” of 3000F (1650C) insulating firebrick backed up with 4” of 2300F (1260C) ceramic fiber. The roof and door are made from 2850F (1565C) ceramic fiber modules. All insulation is available in preshaped sections for easy maintenance. As an option the entire insulation can be ceramic fiber modules for fast heat up and cool down. No asbestos is used.
DEEP PLUG DOOR WITH VESTIBULE AND DOUBLE PIVOT HINGE FOR EXTREMELY TIGHT SEAL
The horizontally opening door features a 2” deep plug for excellent heat blockage even at elevated temperatures. Double pivoting of hinge allows parallelogram opening of the plug door. This keeps the hot face from the operator and allows tight sealing of the door. A vestibule around the perimeter of the door reduces heat loss when the door is opened. This also aids temperature uniformity while protecting the elements from physical damage.
TEMPERATURE UNIFORMITY OF +/-25F (+/-15C)
Uniformity of +/-25F (+/-15C) is normal above 1600F (870C) within 2/3 of the working dimensions.
1-1/2” THICK SILICON CARBIDE HEARTH
The hearth is a 1-1/2” thick silicon carbide hearth plate for strength and excellent heat transfer. Height from floor to hearth is 32”.
DIGITAL PID CONTROL AND HIGH LIMIT SYSTEM
The standard control is a Honeywell UDC 2000 digital PID 3 mode tuning control. All fuses, contactors, and controls are located in a NEMA 1 panel. The thermocouples are Type R. The control voltage is transformed to 120 volts. A NEMA 13 Lighted On/Off switch and NEMA 13 door power cut off switch are included. A Honeywell UDC 2000 digital high limit back up control with manual reset, back up contactors and separate thermocouple is standard. Customer must connect fused power supply to single point on panel .
SCR POWER CONTROL AND TAP TRANSFORMER
The power control has a 6 position tap transformer with taps that are changed inside the control panel and a phase angle fired SCR. The SCR adjusts for most voltage changes automatically as needed, eliminating the need to manually change taps during operation.
TESTING AND INSTRUCTIONS
The furnace is tested to insure circuit integrity. 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 diagram and panel layout are prepared on CAD for easy readability.
WARRANTY
The furnace is warranted for one year except for elements and thermocouples (warranted for 6 months.)
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