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HIGH TEMPERATURE UNIFORMITY
The hardening furnace is uniform to within +/-20F(+/-10C) above 1500F (815C). The tempering oven is uniform to within +/-10F (+/-5C) above 300F (150C).
TWO ZONES AND EVEN ELEMENT PLACEMENT
The elements of the hardening furnace are divided into top and bottom zones. The control output is routed through two input switches which allow adjustment of the total time on to each zone. There are thermocouples mounted in the top and bottom with a se lector switch to read the temperature differential. The elements in the hardening furnace are evenly spaced on the top, bottom and sides for even heating. Elements in the tempering oven are on the sides. The elements are supported in proprietary high temperature ceramic element holders. These provide perfect support for the coiled element as well as excellent radiating characteristics. The smooth surface prevents premature failure of the element as it expands and contracts. The standard elements are iron-aluminum-chrome alloy.
EFFICIENT MULTILAYERED INSULATION
Both chambers are insulated with 2-1/2” of low K factor refractory firebrick as the primary insulation. This is backed up by 2” of very low K factor mineral wool board on all surfaces except the bottom which has 2” of hard calcium silicate back up for so lid hearth support. This yields an excellent combination of strength, insulating quality and fast heat up and cool down time. 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 back mounted alloy fan. It is belt driven with a 1/6 H.P. motor. A heat dissipator protects the bearings. The removable recirculation muffle is constructed of 304 stainless steel. The muffle protects the work from direct radiation of the elements and creates a recirculation pattern for the air.
HARDENING FURNACE HAS CERAMIC HEARTH
The standard hearth for the hardening furnace is a 3/4” thick ceramic plate elevated on ceramic standoffs 1-1/2” above the bottom elements.
SPRING LOADED VERTICAL PLUG DOOR
The hardening furnace door is a spring loaded swing up vertical door. The spring holds the door tightly closed, counterbalances it while opening, and holds it up while open. The hot face of the door is kept from the operator. There is a 1/2” refractory plug which protrudes into the furnace chamber and provides an effective heat lock. There is a 2” refractory seal around the perimeter of the door. The tempering oven door is a single pivoted horizontal door hinged on the left. It also has a 1/2” plug for a heat lock.
DIGITAL PID CONTROL 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. There is two zone control (top and bottom) on the hardening furnace. The thermocouples are 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 s witch 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 each chamber. 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 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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