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HIGH TEMPERATURE UNIFORMITY
The hardening furnace is uniform to within +/-25F (+/-10C) above 1600F (870C). The tempering oven is uniform to within +/-10F (+/-5C) above 300F (148C).
CERAMIC ELEMENT HOLDERS
Standard elements are coiled iron-aluminum-chrome alloy. The elements are supported in element plates along the sides. 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. Nickel-chrome elements are optional.
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.
INTEGRATED CASE
The furnace case is constructed of 14 gauge steel with external structural stiffeners. The entire case is primed with 800F silicone paint and finished in machine enamel. Both chambers are mounted in one integrated case with lifting rings.
ROLL AWAY QUENCH TANK
A quench tank is provided with casters to roll under the furnace. This tank includes a drain.
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 dissipater 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 FEATURES CERAMIC HEARTH
The standard hearth for the hardening furnace is a 3/4” thick ceramic plate elevated on ceramic standoffs 1/2” above the bottom.
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 p lug 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. The doors are ceramic fiber board for resistance to heat shock.
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. Standard contactors are mechanical. The thermocouples are Type K. Thermocouple break protection is included. Limit switches shut off furnace power when doors are opened or the backs are removed. Lighted NEMA 13 On/Off switch is included. Control voltage is transformed to 120 volts. The control circuit and each power branch circuit are fully fused. 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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