FAST HEAT UP AND COOL DOWN TIMES
An emp
ty HB furnace will heat up to 2000F (1093C) in approximately one hour. The higher K.W. option will trim this. Cool down to 500F (260C) is approximately 10 hours.
FURNACE UNIFORMITY
The temperature uniformity inside approximately 2/3 of the furnace chamber is in the range of +/-25F (+/-13C) at 1800oF (975C).
HEAVY DUTY BENCH MOUNTED CASE
The case is constructed of 10, 14 and 16 gauge steel with stiffeners. The entire case is primed with 800F silicone paint and finished in machine enamel. Lifting rings are provided.
IRON-ALUMINUM-CHROME ALLOY ELEMENTS
The elements are coiled iron-aluminum-chrome alloy. A low watt density is used for long element life at high temperatures. Nickel-chrome alloy elements are available as a no charge option for wax burn out or resistance to oil fumes.
CERAMIC ELEMENT HOLDERS
The elements are supported in ceramic element plates located on the sides of the furnace. 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. Elements are easy to replace.
EFFICIENT MULTILAYERED INSULATION
The furnace is 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 solid hearth support. Top is 4-1/2" firebrick for strength. 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.
CERAMIC HEARTH INCLUDED
The standard hearth is a 3/4” thick ceramic plate elevated on ceramic standoffs 1/2" above the bottom firebrick. This air space aids uniformity.
SPRING LOADED VERTICAL PLUG DOOR
The 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 to refractory seal around the perimeter of the door.
DIGITAL PID CONTROL SYSTEM
The standard control is a Honeywell UDC 2300 digital PID 3 mode tuning control. All fuses, transformers, contactors, and controls are located in a NEMA 1 panel. Mechanical power contactors are standard; mercury contactors and SCR power controls are optional. The thermocouple is Type K. Thermocouple break protection is included. Limit switches shut off furnace power if the door is opened or the power panel back is removed. Control voltage is 120 volts. A NEMA 13 lighted On/Off switch is included. 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.)
