High Temp Heavy Duty Box Furnace
- Grieve - HD-183618-HT, HD-243618-HT, HD-243624-HT, HD-244824-HT and more
- Uniformity at 100°F below maximum temperature
- Rise Time in minutes to 100°F below maximum temperature
- Tests run with empty oven and minimum exhaust
These furnaces are used for a variety of heat treating applications such as tempering, hardening, sintering or firing, including those applications requiring higher temperatures.
Precision microprocessor based temperature controls and energy-saving insulation maximize the performance of these rugged units.
Outside Dimensions
- All Models: Control panel overhang 9″ right side
- Gas Models: Combustion blower overhang 36″ rear
- Electric Models: Transformer overhang 24″ rear
Operating Characteristics
- Accuracy as percent of controller span
- Uniformity at 100°F below maximum temperature
- Rise Time in minutes to 100°F below maximum temperature
- Tests run with empty oven and minimum exhaust
- Performance will vary with load and application
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
Safety Equipment
- 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
- 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)
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 Kanthal AF rod overbend heating elements beneath hearth and hanging from J-hooks on vertical walls
- Rear mounted power transformer provides low voltage for heating elements
- 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 4” of light weight, energy saving refractory ceramic fiber and 7” of firebrick (roof insulation 10” of Refractory Ceramic Fiber)
- Load supporting floor insulated with 4” of 18-½ lbs per cubic foot density 1900⁰F block and 7” 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
- Electric door: Electromechanical operator pivots door, supported by structural steel arms and bearings, upward above furnace
- 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
READ ON OUR BLOG:
Standard & custom-made Grieve ovens in action
*** Not for use with flammable solvents, vapors, or gases ***
MODEL | WORKSPACE | OUTSIDE DIMENSIONS*(WXDXH) | MAX TEMP | HEAT INPUT | INSULATION THICKNESS | OPERATING CHARACTERISTICS† | DOOR TYPE | HEIGHT W/ DOOR OPEN | HEARTH RATING | APPROX SHIPPING WEIGHT | |||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
DIMENSIONS(WXDXH) | VOLUMECU FT | ELECTRICKW | GASBTU/HR | CONTROL ACCURACY | TEMPERATURE UNIFORMITY | RISE TIME (ELECTRIC) | RISE TIME (GAS) | ||||||||
HD-183618-HT | 18" x 36" x 18" | 6.8 | 59" x 81" x 77" | 2,200°F | 40 | 425,000 | 11" | ± 0.3% | ±25°F | 180 | 140 | 100" | 300 | 4,500 lbs | |
HD-243618-HT | 24" x 36" x 18" | 9 | 65" x 81" x 77" | 2,200°F | 48 | 450,000 | 11" | ± 0.3% | ±25°F | 165 | 125 | 100" | 360 | 4,800 lbs | |
HD-243624-HT | 24" x 36" x 24" | 12 | 65" x 81" x 83" | 2,200°F | 56 | 520,000 | 11" | ± 0.3% | ±25°F | 155 | 120 | 110" | 360 | 5,700 lbs | |
HD-244824-HT | 24" x 48" x 24" | 16 | 65" x 94" x 83" | 2,200°F | 65 | 600,000 | 11" | ± 0.3% | ±25°F | 150 | 130 | 110" | 480 | 6,500 lbs | |
HD-304830-HT | 30" x 48" x 30" | 25 | 71" x 94" x 89" | 2,200°F | 72 | 700,000 | 11" | ± 0.3% | ±27°F | 165 | 130 | 118" | 600 | 7,300 lbs | |
HD-306030-HT | 30" x 60" x 30" | 31.3 | 71" x 105" x 89" | 2,200°F | 78 | 725,000 | 11" | ± 0.3% | ±27°F | 180 | 140 | 118" | 700 | 8,400 lbs | |
HD-364836-HT | 36" x 48" x 36" | 36 | 77" x 94" x 95" | 2,200°F | 78 | 800,000 | 11" | ± 0.3% | ±30°F | 180 | 140 | 135" | 750 | 8,600 lbs | |
HD-366036-HT | 36" x 60" x 36" | 45 | 77" x 105" x 95" | 2,200°F | 88 | 850,000 | 11" | ± 0.3% | ±30°F | 180 | 150 | 135" | 850 | 9,800 lbs | |
HD-367236-HT | 36" x 72" x 36" | 54 | 77" x 117" x 95" | 2,200°F | 100 | 1,000,000 | 11" | ± 0.3% | ±30°F | 180 | 150 | 135" | 1000 | 10,500 lbs | |
HD-484836-HT | 48" x 48" x 36" | 48 | 89" x 94" x 95" | 2,200°F | 90 | 915,000 | 11" | ± 0.3% | ±30°F | 180 | 150 | 135" | 925 | 9,500 lbs | |
HD-484848-HT | 48" x 48" x 48" | 64 | 89" x 94" x 107" | 2,200°F | 110 | 1,100,000 | 11" | ± 0.3% | ±33°F | 165 | 130 | 159" | 1100 | 10,500 lbs | |
>HD-487248-HT | 48" x 72" x 48" | 96 | 89" x 116" x 107" | 2,200°F | 158 | 1,500,000 | 11" | ± 0.3% | ±35°F | 140 | 120 | 159" | 1600 | 13,500 lbs |
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