DV4848

DV-DR Series Heavy Duty Floor Standing Gas Or Electric Recirculating 1300°F (700°C) Tempering Ovens

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LOCKED BY SERIES
Type Oven
Power Source Electric Or Gas
Loading Front
Uniformity AMS Class 2 (± 10ºF / 6ºC)
Atmosphere Air
Lining S.S. Ceramic/Mineral Fiber

Applications

LOCKED BY SERIES

Description

The DV/DR SERIES Floor Standing Recirculating Cabinet Ovens feature high volume air recirculation for high temperature uniformity, gas or electric operation, a stainless steel interior and a precision PID digital control system. They are designed for heavy duty production heat treating applications such as tempering, annealing and solution heat treating, although they find many other uses. They are rated to 1300°F (700°C) operation. Horizontal (DV) or vertical (DR) doors are available.


Processes


Markets

Specifications

Dimension
W
H
D
Inside
51
51
51
Working
48
48
48
External
110
128
76
Hearth
48
-
48
Work Cubic Feet 64
* All dimensions in inches unless otherwise specified.
Power
Standard Pwr 72
High Power 144
Max Temp (°F) 1200
Fan Power (HP) 10
* All power values in KW unless otherwise specified.
Weight
Ship Weight 3800
Max Load 4000
* All weights in Lbs unless otherwise specified.


Additional Features

HORIZONTAL OR VERTICAL DOORS
The DV Model door is a deep plug horizontal door. The models that are 36” wide (or wider for special models) feature two doors that meet in the middle. The horizontal doors feature ceramic fiber tadpole seals. Pneumatic and electric vertical doors are also available (DR Models). These feature a front vestibule of castable refractory and ceramic fiber lined doors which seal against this non-expanding vestibule. The DR Models can be supplied with traveling rollers on the vertical doors to match roller hearths inside the oven. Special hydraulic forklift loaders are also available for loading heavy loads.
DIGITAL PID CONTROL AND HIGH LIMIT SYSTEM
The standard control is a Honeywell UDC 2500 digital PID 3 mode tuning control. All fuses, transformers, contactors, and controls are located in a NEMA 1 panel. Quiet, long life solid state power contactors are standard; SCRs are optional. The thermocouples are sheathed Type K. The control voltage is transformed to 120 volts. A Honeywell UDC 1200 digital high limit back up control with manual reset, back up contactors and separate thermocouple is included. Single point power connection.
RECIRCULATION FOR UNIFORMITY OF +/-10F
A heavy duty high volume, high velocity air cooled alloy fan is mounted in the top with full recirculation ducting. The ducting features adjustable vents to control the recirculation pattern of the air. A minimum of 40 volume changes per minute of the en tire interior is achieved. The fan is dynamically balanced and engineered for long life at high temperatures. The fan is manufactured by Industrial Gas Engineering and is very reliable.
TESTING AND INSTRUCTIONS
The electric ovens are power tested to insure proper watt ratings. Gas ovens are completely tested at operating gas pressures that are specified by customer. 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. Gas ovens include a gas schematic.
WARRANTY
The furnace is warranted for one year except for elements and thermocouples which are warranted for six months. See warranty sheet Q12W.
HEAVY GAUGE STAINLESS STEEL INTERIOR
The entire interior is made of stainless steel for heat and corrosion resistance. The bottom is 10 gauge while the liners and baffles are 18 gauge. They are designed to expand and contract with the heat.
SEVEN INCHES OF INSULATION
1” of 2300F ceramic fiber insulation is backed up with 6” of mineral wool sandwiched between the interior and exterior of the oven. The bottom insulation is non-compressible 2300F firebrick and calcium silicate. No asbestos is used.
INCOLOY ELEMENTS FOR ELECTRIC
Electric ovens feature elements located in the recirculating plenum chamber away from the working zone. These are incoloy sheathed elements which are rated for 1600F. They are replaced easily from the back.
HIGH TURN DOWN RATIO GAS BURNER FOR GAS
The gas fired ovens feature an Eclipse gas burner with a high turn down ratio. The gas system includes a proportional motor control which adjusts both gas and air to maintain stoichiometric firing, a gas regulator, lubricated gas cock, combustion air pressure switch, high/low gas pressure switch, pilot system with pilot solenoid and pilot regulator, two shut off solenoids, UV flame safety, air purge system (4 volume changes) and integrated combustion blower. The system meets NFPA and FM standards. The gas burner fires into the plenum chamber avoiding flame impingement on work. May be specified for natural gas or propane.
HEAVY DUTY UNITIZED CASE CONSTRUCTION
The oven case is constructed of reinforced 10 gauge steel with an integrated floor stand with leveling bolts and mounting holes. The case is primed with 800F silicone paint and finished in machine enamel.

Additional Options

1400F (760C) OPERATION
Interior is 316 Stainless Steel.
CAST ALLOY HEARTH TRAY
Cast alloy grids. Grade depends on temperature, quench severity and loading service factors.
CAST ALLOY ROLLER RAIL HEARTH
Cast alloy roller hearths and cast trays with roller wheels mounted in bottom rails are commonly used for loading of heavy loads. External roller assemblies, either fixed or movable on casters, which match the roller trays are also made.
CASTABLE PIERS HEARTH
Castable Piers for forklift loading are available. The piers are cast from insulating castable which is formulated for high heat shock resistance (and will withstand 2200F/1200C). In addition, the piers have alloy fibers cast into them for mechanical s hock resistance. They are cast in sections that are easy to handle. They are fully cured for strength.
CONTROL, RECORDER AND ELECTRICAL OPTIONS
CONTROL, RECORDER AND ELECTRICAL OPTIONS
INERT GAS PANEL
The furnace case is tightly sealed for use with a protective inert atmosphere. Argon, nitrogen and gases enriched with up to 4% combustible gas (such as hydrogen or propane) can be used. No safety systems are required. A threaded alloy fitting introduces the gas into the furnace chamber. The element connection chamber is typically purged. The door seal is augmented with a woven ceramic fiber gasket. A properly sized flowmeter/regulator is included with the atmosphere system. A rule of thumb on atmosphere usage is to figure six to ten times the furnace volume times the number of hours the work will be in the furnace.
JIC CONTROL OPTION
This includes a NEMA 12 control cabinet, all oil tight switches and a panel mounted fused disconnect switch. Zone switches if included are percentage timers.
LOADER
A heavy duty loader will pick up the hearth tray by pivoting slightly in the back by means of a hydraulic cylinder actuated by a hand pump located on the loader. The loader can have two swivel wheels and two fixed wheels. Optionally, the wheel can be mounted on either inverted "V" tracks or railroad tracks embedded in the floor. All distances are engineered for precise and trouble free operation. The loader is typically designed to pick up the maximum rated load of the furnace. The loaders can be fitted with motorized drives.
MANUAL OR POWERED BLOWER EXHAUST
A manual or motor powered blower can be provided for venting the oven. Optional safety package for solvent use.
MANUALLY ADJUSTED THREE ZONE SCR POWER CONTROL WITH AC INVERTER CONTROL FOR FAN
Digital biasing control is included to adjust relative output of SCRs to adjust temperature uniformity. There are 3 separate Zero Fired SCR power controls, one for each zone of heating. This allows you to fine tune the furnace for different temperature points. The SCRs are microprocessor based. The biasing switches have 99 increments. An AC invertor is included to slow fan motor speed for accurate low temperature control.
ON SITE START UP AND TRAINING
An L&L factory technician will review and check out customer’s installation, start up and burn in furnace, and train the operators.
SEALED CASE FOR INERT ATMOSPHERE
Case is sealed and inert atmosphere is introduced into the furnace chamber and through the element connection area. A flowmeter/regulatoror inert gas flow panel is provided.
SHELVES AND SPECIAL HEARTHS
Perforated stainless steel shelves are available.
SINGLE ZONE SCR POWER CONTROLLER
A zero fired SCR power control with two-leg control is used instead of contactors. This is constructed with transient voltage protection, sub-cycle fuse protection, extra large heat sinks, and positive zero firing. Gain and bias adjustments are included for tuning.

Downloads

Brochure For DV/DR
Aerospace Brochure
Capabilities Brochure