Tempering Furnace

• 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

Safety Equipment

• Adjustable manual reset excess temperature interlock to turn off heat on malfunction of main temperature controller
• Recirculating blower air flow safety switch to turn off heat on loss of recirculated air flow

Electric Heat Includes

• Separate heating element control contactors to turn off heat on malfunction of main control contactors

Gas Heat Includes

• Automatic pre-ignition purge period to clear accumulated gas or fumes
• Push button electric ignition
• Microprocessor based electronic flame safeguard protection to continuously monitor flame and close gas valves if flame is not present
• 325 CFM (650 CFM at 510,000 BTU/hr input) stainless steel powered forced exhauster to provide combustion venting
• Exhauster air flow safety switch to close gas valves on loss of venting
• Two pilot valves to guarantee gas flow to pilot can be stopped
• High and Low gas pressure switches to confirm safe operating pressure range
• Two main burner safety shut off valves with valve seat position indicator to assure gas flow to main burner can be stopped
• Proof of closure switch on one main valve 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

Construction

• 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 alloy coiled wire heating elements supported in alloy rack
• Modulating burner for 1000 BTU per cubic foot natural gas at 2 psig pressure – propane available – propane available. Inlet 1” NPT
• Heat source located in heat chamber to prevent radiant heating
• High pressure, air cooled, stainless steel recirculating blower
• Full coverage supply and return duct work with adjustable opposed louvers
• Adjustable fresh air intake and 4” diameter (6” on Gas Heat) exhaust outlet damper
• 16 gauge 304 stainless steel work space interior
• Refractory fiber and fire brick heat chamber
• Insulated with 2” of rockwool and 5”of light weight, energy saving refractory ceramic fiber
• Load supporting floor insulated with 2” of 18-½ lbs per cubic foot density 1900⁰F 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
• 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
• Stainless steel grate at bottom of work space for loading
• Fully assembled and factory tested

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Standard & custom-made Grieve ovens in action