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HIGH TEMPERATURE UNIFORMITY
The hardening furnace is uniform to within +/-25ºF (+/-10ºC) above 2000ºF (1095ºC). The tempering oven is uniform to within +/-10ºF (+/-5C) above 300F (150C).
SILICON CARBIDE ELEMENTS
The elements of the hardening furnace are silicon carbide rods mounted over and under the hearth for even heating. All element connections are on the side. The elements are designed to run at line voltage. These elements easily permit the 2500F (1370C) maximum temperature under continuous operating conditions.
EFFICIENT MULTILAYERED INSULATION
The hardening chamber features 4-1/2" of 2800ºF (1535ºC) insulating firebrick backed up with 4" of mineral wool. The tempering oven is insulated with 4-1/2” of 2300F (1260C) firebrick backed up with 2" of mineral wool. All refractory is coated with a special facing that prolongs firebrick life and helps prevent spalling and dusting. The refractory sections are available completely shaped for easy replacement without cementing. All sections fit together with engineered heat locks which improve the insulating integrity of the furnace. No asbestos is used.
HEAVY DUTY INTEGRATED CASE
Both chambers are mounted in one integrated 10 gauge steel case with structural stiffeners and lifting rings. The entire case is primed with 800F silicone paint and finished in machine enamel.
FAN AND RECIRCULATION MUFFLE
The tempering oven features a vertically mounted four bladed alloy fan. It is belt driven with a 3/4 H.P. motor. A heat dissipator protects the bearings. The removable recirculation muffle is constructed of 330 alloy. The muffle protects the work from direct radiation of the elements and creates a recirculation pattern for the air.
SILICON CARBIDE HEARTH
The hardening furnace features a 1-1/2" thick silicon carbide hearth plate for strength and good heat transfer.
DOUBLE PIVOTED PLUG DOORS
Both doors are double pivoted horizontal doors with refractory plugs (1/2" on the low heat chamber and 1-1/2" on the high heat chamber) for a superb heat lock around the door seal. The double pivoting allows the door to be opened so that the hot face stays away from the operator. A vestibule around the perimeter of the hardening furnace door reduces heat loss when the door is opened. This also aids temperature uniformity will protecting the elements from physical damage.
DIGITAL PID CONTROL AND HIGH LIMIT SYSTEM
The standard controls are Honeywell UDC 2300 digital PID 3 mode tuning controls. All fuses, transformers, contactors, and controls are housed in a NEMA 1 panel. Quiet, long life mercury power contactors are standard. The thermocouples on the hardening furnace are Type R while the tempering oven has Type K. Thermocouple break protection is included. Limit switches shut off power when doors are opened or the backs are removed. Control voltage is transformed to 120 volts. A NEMA 13 lighted On/Off switch is included. The control circuit and each power branch circuit are fully fused. A Honeywell UDC 2300 digital high limit back up control with manual reset, back up contactors and separate thermocouple is standard for both chambers. Customer must connect fused power supply to single point on panel.
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 and panel layout diagram 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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