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- Grieve - Model HD-304830 - Heavy Duty ...
Grieve - Model HD-304830 -Heavy Duty Box Furnace
These furnaces are used for a variety of heat treating applications such as tempering, hardening, sintering or firing, including those requiring inert atmospheres. Precision microprocessor based temperature controls and energy-saving insulation maximize the performance of these rugged units.
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Certifications
- UL Listed Control Panel
- Meets the Requirements of the Following Standards:
- NFPA 86 (Standard for Ovens and Furnaces)
- NFPA 70 (National Electric Code)
- FM (Factory Mutual)
- OSHA
- Caution:
- When processing combustible material fire protection should be considered
- Not for use with flammable solvents or vapors. Other models available for these applications. For more information see Class A Solvent Processing page at this website
- Adjustable manual reset excess temperature interlock to turn off heat on malfunction of main temperature controller
- Electric Heat Includes
- Separate heating element control contactors to turn off heat on malfunction of main control contactors
- Door interlock turns off power to heating elements when door is opened to protect operator from line voltage at heating elements
- Gas Heat Includes
- Multiple modulating burners fired under hearth from opposing sides to circulate heated air (single burner at top of work space on HD-153015)
- Automatic pre-ignition purge period to clear accumulated gas or fumes from furnace
- Push button electric ignition
- Microprocessor based electronic flame safeguard protection for each burner to continuously monitor flame and close gas valves if flame is not present
- Combustion air blower
- Combustion Blower air flow safety switch to close gas valves on loss of combustion air flow
- High and Low gas pressure switches to confirm safe operating pressure range
- Two pilot valves for each pilot to guarantee gas flow to pilot can be stopped
- Two main safety shut off valves for each burner with valve seat position indicator to assure gas flow to each main burner can be stopped
- Proof of closure switch on one main valve at each burner to prevent igniting pilot unless main valve is closed
- Leak test station at each pilot and main burner valve to allow testing for leakage through valve
- Door interlock drives main burners to low fire as door is opened to protect operator from flames
Controls
- Digital temperature controller
- LED pilot lights
- On-off heat switch
- 5 kA short circuit current rating (SCCR)
- Choice of
- Air or Inert Atmosphere construction
- Electric or Gas heat (Air construction only)
- 208 volt, 230 volt or 460 volt, 3-phase, 60 HZ – other input power available
- All welded construction
- High temperature Kanthal A-1 coiled wire heating elements supported in vacuum cast refractory ceramic fiber located on all walls and beneath hearth
- 1000 BTU per cubic foot natural gas at 2 psig pressure – propane available. Inlet 1” NPT up to 800,000 BTU/hr, 1-¼ “ NPT to 1,000,000 BTU/hr, 1-½” NPT above 1,000,000 BTU/hr
- Insulated with 9”of light weight, energy saving refractory ceramic fiber
- Load supporting floor insulated with 4” of 18-½ lbs per cubic foot density 1900°F block and 4-½” of firebrick,
- 3/16” steel plate reinforced furnace shell with Trilite Green enamel finish
- ½” thick steel front plate around door
- Fire brick throat and doorsill to protect furnace during loading
- Brushed stainless steel control panel face
- Powered vertical lift door (gas spring assisted manual door on HD-153015)
o Electric door: Electromechanical operator pivots door, supported by structural steel arms and bearings, upward above furnace
o Air door: Air cylinder lifts door hanging from heavy duty roller chain supported by sprockets, shaft and pillow block bearings - Door hot side faces away from operator
- Soft insulation on door hot face seals against throat brick and steel front plate
- 2” thick , heavy duty ceramic hearth plates supported by fire brick piers
- Fully assembled and factory tested
- 1 year limited warranty
- MODEL : HD-304830
- MAXIMUM OPERATING TEMP : 2,000°F
- AIR FLOW : Radiant
- CONTROL ACCURACY : ± 0.3%
- OVEN UNIFORMITY : ±16°F
- RISE TIME - ELECTRIC : 120 mins
- RISE TIME - GAS : 90mins
- WORKS SPACE DIMENSIONS (WxDxH) : 30" x 48" x 30"
- SHELVES INCLUDED : None
- NUMBER OF SHELVES MAX : None
- SHELF CAPACITY : None
- MAX LOAD CAPACITY : Not Available
- DOORS : Electric
- LOADING METHOD : Floor
- APPROXIMATE SHIP WEIGHT : 4500 lbs
- OUTSIDE DIMENSIONS (WxDxH) : 67" x 92" x 86"