High Temperature
Walk-In Ovens

BULLETIN
WI-520

 

HEAVY DUTY
ELECTRIC AND GAS
900°F, 1050°F & 1200°F
WALK-IN OVENS


 

For annealing, sintering, precipitation hardening, burn-off or any other high temperature processing of large or numerous parts. Constructed with an isolated inner oven to eliminate heat transfer and leakage at seams commonly found in standard panel construction. Designed and constructed for long, hard, continuous use with the temperature uniformity required for consistent results at elevated temperatures.

STANDARD FEATURES Back to Top
• UL LISTED CONTROL PANEL
• Standard Truck Ovens from Grieve meet the requirements of National Fire Protection Association Standard 86, Industrial Risk Insurers, Factory Mutual and OSHA standards. For some applications, such as those involving flammable solvents or hazardous locations, the above organizations require additional safety devices.

• Controls
— Digital, microprocessor based, thermocouple actuated, indicating temperature controller
— Modulating burner on gas ovens
— Motor control push buttons and on-off heat switch
— LED pilot lights
• Safety Equipment — Electric Oven
— Adjustable, thermocouple actuated, manual reset excess temperature controller
— Separate heating element control contactors
— Recirculating blower air flow safety switch
• Safety Equipment — Gas Oven
—Adjustable, thermocouple actuated, manual reset excess temperature controller
—Electronic flame safeguard protection
—Powered forced exhauster for combustion venting
—Exhauster air flow safety switch
—Recirculating blower air flow safety switch
—Purge timer
—High gas pressure switch
—Low gas pressure switch
—Two pilot safety shutoff valves with leak test stations
—Two main safety shutoff valves with leak test stations (Industrial Risks Insurers vent valve only provided on specific request)
—Valve position indicator on main safety shutoff valves
—Over 400,000 BTU/HR safety shutoff valve interlocked with purge timer

 
• Construction
—Choice of air flow patterns
—Adjustable patented opposed louvers on full coverage supply and return ductwork
—Exceptionally heavy duty doors
—Explosion venting latches
—Doors equipped with expansion joints on inner face to guarantee uniform sealing at all temperatures
—Inner and outer door gaskets; inner gasket seals directly against door plug; outer gasket seals against front face of oven
—3/8" steel plate oven front to guarantee rigid sealing surface at all temperatures
—Slip flashing at door openings to allow inner oven to expand without effecting outer oven or door sealing surface
—Aluminized steel exterior with enamel finish
—Brushed stainless steel control panel face
—1 year limited warranty


 • Every oven fully assembled and individually factory tested
SPECIFICATIONS Back to Top
CAUTION: OVENS PROCESSING COMBUSTIBLE MATERIAL ARE REQUIRED BY NATIONAL FIRE PROTECTION ASSOCIATION STANDARD 86 TO HAVE A FIRE SUPPRESSION SYSTEM. IF FLAMMABLE SOLVENTS OR VAPORS ARE PRESENT IN AN OVEN, OSHA REQUIRES CONFORMANCE WITH NFPA 86 WHICH DEFINES OVENS FOR THESE APPLICATIONS AS CLASS A OVENS. A POWERED FORCED EXHAUSTER AND OTHER NON-STANDARD SAFETY EQUIPMENT MUST BE ADDED. SEE BULLETIN TC-940 AND CONSULT FACTORY.
Model
Work Space
Outside
Dimensions*
(WxDxH)
Max
Temp
Blower
Insu-
lation
Doors
Heat Input
Operating Characteristics†
Approx
Shipping
Weight
Dimensions
(WxDxH)
Volume
Cu Ft
CFM
HP
KW
BTU/HR
Control
Accuracy
Oven
Uniformity
Rise Time
Electric Gas
B1-900 48" x 48" x 72" 96     75" x 94" x 92" 900°F   4200   3 9" Double 60   400,000   ± 0.3% ± 10°F 60 min 45 min 8300  
B1-1050 48" x 48" x 72" 96     79" x 104" x 97" 1050°F   6400   5 10" Double 80   550,000   ± 0.3% ± 12°F 70 min 45 min 9280  
B1-1200 48" x 48" x 72" 96     87" x 114" x 103" 1200°F   10,000   7 1/2 12" Double 120   880,000   ± 0.3% ± 15°F 80 min 40 min 15,485  
B2-900 54" x 72" x 72" 162     81" x 119" x 87" 900°F   5000   5 9" Double 80   600,000   ± 0.3% ± 10°F 80 min 50 min 9220  
B2-1050 54" x 72" x 72" 162     87" x 130" x 98" 1050°F   7800   5 10" Double 100   880,000   ± 0.3% ± 12°F 80 min 50 min 10,625  
B3-900 60" x 96" x 72" 240     91" x 152" x 95" 900°F   7800   5 9" Double 100   700,000   ± 0.3% ± 10°F 80 min 45 min 10,625  
B3-1050 60" x 96" x 72" 240     97" x 158" x 98" 1050°F   10,000   7 1/2 10" Double 120   880,000   ± 0.3% ± 12°F 90 min 50 min 12,405  
B4-900 72" x 120" x 72" 360     109" x 178" x 96" 900°F   12,500   10 9" Double 120   800,000   ± 0.3% ± 10°F 90 min 50 min 12,955  
B1H-900 48" x 48" x 72" 96     75" x 108" x 88" 900°F   5000   5 9" Double 60   400,000   ± 0.3% ± 10°F 60 min 45 min 8340  
B1H-1050 48" x 48" x 72" 96     81" x 110" x 91" 1050°F   7800   5 10" Double 80   550,000   ± 0.3% ± 12°F 60 min 45 min 9285  
B1H-1200 48" x 48" x 72" 96     95" x 114" x 94" 1200°F   12,500   10 12" Double 120   880,000   ± 0.3% ± 15°F 70 min 40 min 15,480  
B2H-900 54" x 72" x 72" 162     85" x 132" x 88" 900°F   7800   5 9" Double 80   600,000   ± 0.3% ± 10°F 80 min 50 min 9275  
B2H-1050 54" x 72" x 72" 162     91" x 134" x 91" 1050°F   10,000   7 1/2 10" Double 100   880,000   ± 0.3% ± 12°F 80 min 50 min 10,630  
B3H-900 60" x 96" x 72" 240     93" x 156" x 88" 900°F   10,000   7 1/2 9" Double 100   700,000   ± 0.3% ± 10°F 80 min 45 min 10,615  
B3H-1050 60" x 96" x 72" 240     101" x 158" x 91" 1050°F   12,500   10 10" Double 120   880,000   ± 0.3% ± 12°F 90 min 50 min 12,385  
B4H-900 72" x 120" x 72" 360     119" x 180" x 88" 900°F   17,500   15 9" Double 120   800,000   ± 0.3% ± 10°F 90 min 50 min 12,970  
  *All Models—Control panel overhang 9" right side.
Blower motor overhang on rear:
  19" on 3 and 5 HP motors,
  26" on 7-1/2 and 10 HP motors, 28" on 15 HP.
Gas Models—Burner overhang 15" right side. 		†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. See Bulletin TC-920 for additional details.
STANDARD EQUIPMENT   Back to Top
• All Models
— 208 volts, 3-phase, 60 Hz
— 230 volts, 3-phase, 60 Hz
— 460 volts, 3-phase, 60 Hz
— Other electrical characteristics available

Exclusive construction is far superior to commonly used panel construction. Consists of an isolated inner oven completely surrounded by insulation to eliminate heat transfer from through metal and hot air leakage at panel seams. Insulated floor standard. Trilite Green enamel painted aluminized steel exterior.

 • Electric Models
Each features completely wired, side access UL listed control panel enclosing terminals for incoming power, temperature controllers, push buttons and pilot lights. Motor starter and heating element contactors electrically interlocked to shut off heaters if power to blower is interrupted and to permit operation of blower without heat for cooling. Incoloy sheathed tubular heating elements on all models. The 1200°F models have a heat chamber high limit control.

 • Gas Models
— 1,000 BTU natural gas at 6" water column pressure, 1" NPT inlet
— Other gas characteristics available

Control panel as detailed above and safety devices as listed on the front of this bulletin. A 325 CFM powered forced exhauster is included up to 700,000 BTU/HR; at 800,000 BTU/HR a 650 CFM exhauster is included. Both exhausters have 6" outlets. Automatic pre-ignition purge period and push button electric ignition contributes to ease of operation. Modulating gas burner is protected with electronic flame safety relay..

B1, B2, B3, B4 SERIES
Combination Air Flow
Combination air flow for random shapes and sizes or for large bulky objects where heated air can move upward around and through the load.

B1H, B2H, B3H, B4H SERIES
Horizontal Air Flow
Horizontal air flow for applications where heated air must move sideways to pass through a load such as trays or flat sheets.

• 900°F Models
16 gauge aluminized steel interior throughout; 9" of 1250°F 10 lbs/cf density industrial rockwool insulation throughout walls, doors and ceiling; 4" thick insulated floor with 1/8" steel plate cover.
• 1050°F Models
16 gauge aluminized steel work space interior with 16 gauge 304 stainless steel heat chamber interior. Stainless steel recirculating blower. 10" of 1250°F 10 lbs/cf density industrial rockwool insulation throughout walls, doors and ceiling of work space. Oven heat chamber insulated with 2" of 1900°F block surrounded by 8" of 1250°F 10 lbs/cf density industrial rockwool insulation. 6" thick insulated floor with 1/4" steel plate cover.
• 1200°F Models
16 gauge 304 stainless steel interior throughout. Stainless steel recirculating blower. 12" of insulation consisting of 2" of 1900°F block, surrounded by 10" of 1250°F 10 lbs/cf density industrial rockwool insulation throughout walls, doors and ceiling. 7" thick insulated floor with 1/4" stainless steel plate cover.




Circulation Diagrams
(Front View)

B1, B2, B3, B4 Series
Combination vertical and
horizontal air flow.

 

B1H, B2H, B3H, B4H Series
Full horizontal air flow.


ADDITIONAL EQUIPMENT AVAILABLE Back to Top
See Walk-In Oven Additional Equipment Bulletin WI-513
 
for Loading Trucks and Shelves, Truck Tracks and Optional Temperature Controllers and Timers.

 
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Specifications Subject to Change Without Notice
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