Tempering Furnace
- Grieve - TF-183618, TF-243624, TF-304830, TF-364836 and more
- LED pilot lights
- On-off heat switch
- 5 kA short circuit current rating (SCCR)
These furnaces are used for a variety of heat treating applications including those requiring inert atmospheres.
Recirculating blower provides high velocity vertical down air flow for excellent heat transfer. 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
- Blower motor overhang 18″ rear except 20″ on 15 HP
- Gas Models:
- Burner overhang 18″ right side
- 325 CFM exhauster to 510,000 BTU/HR, 650 CFM above
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
- 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
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) | ||||||||
| TF-183618 | 18" x 36" x 18" | 6.8 | 35" x 87" x 74" | 1,400°F | 30 | 190,000 | 7" | ± 0.3% | ±12°F | 95 | 85 | 78" | 400 | 3,100 lbs | |
| TF-243624 | 24" x 36" x 24" | 12 | 47" x 92" x 80" | 1,400°F | 42 | 285,000 | 7" | ± 0.3% | ±14°F | 95 | 85 | 90" | 600 | 4,000 lbs | |
| TF-304830 | 30" x 48" x 30" | 25 | 53" x 106" x 86" | 1,400°F | 52 | 355,000 | 7" | ± 0.3% | ±14°F | 90 | 80 | 102" | 900 | 5,200 lbs | |
| TF-364836 | 36" x 48" x 36" | 36 | 59" x 111" x 126" | 1,400°F | 65 | 450,000 | 7" | ± 0.3% | ±20°F | 90 | 80 | 126" | 1100 | 6,400 lbs | |
| TF-366036 | 36" x 60" x 36" | 45 | 59" x 121" x 126" | 1,400°F | 74 | 510,000 | 7" | ± 0.3% | ±20°F | 90 | 80 | 126" | 1300 | 6,800 lbs | |
| TF-484848 | 48" x 48" x 48" | 64 | 71" x 114" x 150" | 1,400°F | 100 | 660,000 | 7" | ± 0.3% | ±22°F | 80 | 70 | 150" | 1500 | 8,700 lbs | |
| TF-487248 | 48" x 72" x 48" | 96 | 71" x 152" x 150" | 1,400°F | 120 | 800,000 | 7" | ± 0.3% | ±22°F | 80 | 70 | 150" | 2200 | 9,950 lbs | |
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