|
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. The elements are designed to run at line voltage. They permit the 2500F (1370C) maximum temperature under continuous operating conditions. Watt density is between 27 and 39 watts per square inch. 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; FIBER ROOF
There is 4-1/2” of 2800F (1535C) insulating firebrick backed up with 4” of ceramic fiber. The roof is made from 2600F (1425C) ceramic fiber modules. Completely shaped firebrick sections install easily for replacement. As an option, the entire insulation except for the door vestibule can be 2600F fiber modules for fast heat up and cool down. No asbestos is used.
TIGHT PLUG DOOR WITH A DOOR VESTIBULE
The double pivoting of hinge allows parallelogram opening of the plug door which keeps the hot face from the operator and allows tight sealing of the door. The door features a 1” deep plug with heat locks. 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 plate for strength and excellent heat transfer. Floor to hearth dimension is 32”.
DIGITAL PID CONTROL AND HIGH LIMIT SYSTEM
The standard control is a Honeywell UDC 2300 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 2300 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 while operating the furnace.
TESTING AND INSTRUCTIONS
The furnace is tested to insure proper 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).
|
