Top-Loading Ovens

BULLETIN CA-450 HEAVY DUTY ELECTRIC AND GAS HORIZONTAL AIR FLOW TOP LOADING OVENS

Standard Features Specifications Standard Equipment Additional Equipment

MODEL LA-1000	MODEL LD-650

STANDARD FEATURES  Back to Top

• UL LISTED CONTROL PANEL
• Standard Top Loading 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
  —Easy-to-see 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
  

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 NONSTANDARD SAFETY EQUIPMENT MUST BE ADDED. SEE BULLETIN TC-940 AND CONSULT FACTORY.

Model Work Space Outside* Dimensions (WxDxH) Max Temp Blower Insu- lation Floor Loading Heat Input Operating Characteristics† Approx Shipping Weight Model Dimensions (WxDxH) Volume Cu Ft CFM HP KW BTU/HR Control Accuracy Oven Uniformity Rise Time Electric Gas LA-500 36" x 36" x 36" 27 55" x 83" x 48" 500°F 1500 1-1/2 4" 1000 15 100,000 ±0.3% ±6°F      38 min 24 min 2000 lbs LA-500 LA-650 36" x 36" x 36" 27 57" x 85" x 50" 650°F 2000 2 5" 1000 20 150,000 ±0.3% ±8°F      44 min 26 min 2500 lbs LA-650 LA-850 36" x 36" x 36" 27 59" x 89" x 52" 850°F 3000 2 6" 1000 30 250,000 ±0.3% ±10°F      57 min 27 min 3800 lbs LA-850 LA-1000 36" x 36" x 36" 27 65" x 93" x 56" 1000°F 4000 3 8" 1000 40 300,000 ±0.3% ±12°F      60 min 33 min 5500 lbs LA-1000 LB-500 72" x 36" x 36" 54 117" x 55" x 48" 500°F 2450 1-1/2 4" 2000 30 250,000 ±0.3% ±6°F      30 min 22 min 4300 lbs LB-500 LB-650 72" x 36" x 36" 54 119" x 57" x 50" 650°F 3300 2 5" 2000 40 300,000 ±0.3% ±8°F      35 min 19 min 5200 lbs LB-650 LB-850 72" x 36" x 36" 54 123" x 61" x 52" 850°F 4000 3 6" 2000 60 400,000 ±0.3% ±10°F      47 min 26 min 6900 lbs LB-850 LB-1000 72" x 36" x 36" 54 127" x 67" x 56" 1000°F 5000 5 8" 2000 80 600,000 ±0.3% ±12°F      52 min 28 min 7400 lbs LB-1000 LC-500 48" x 48" x 48" 64 67" x 95" x 60" 500°F 2450 1-1/2 4" 2000 30 250,000 ±0.3% ±6°F      35 min 18 min 4600 lbs LC-500 LC-650 48" x 48" x 48" 64 69" x 97" x 62" 650°F 3300 2 5" 2000 40 300,000 ±0.3% ±8°F      40 min 20 min 5500 lbs LC-650 LC-850 48" x 48" x 48" 64 73" x 101" x 64" 850°F 4000 3 6" 2000 60 400,000 ±0.3% ±10°F      52 min 28 min 7400 lbs LC-850 LC-1000 48" x 48" x 48" 64 79" x 105" x 68" 1000°F 5000 5 8" 2000 80 600,000 ±0.3% ±12°F      57 min 26 min 8500 lbs LC-1000 LD-500 96" x 48" x 48" 128 141" x 69" x 60" 500°F 4200 3 4" 4000 60 400,000 ±0.3% ±6°F      24 min 14 min 6900 lbs LD-500 LD-650 96" x 48" x 48" 128 143" x 73" x 62" 650°F 6000 5 5" 4000 80 600,000 ±0.3% ±8°F      27 min 16 min 8300 lbs LD-650 LD-850 96" x 48" x 48" 128 155" x 79" x 64" 850°F 7800 5 6" 4000 100 700,000 ±0.3% ±10°F      46 min 25 min 11000 lbs LD-850 LD-1000 96" x 48" x 48" 128 159" x 87" x 68" 1000°F 10000 7-1/2 8" 4000 120 800,000 ±0.3% ±12°F      52 min 30 min 14000 lbs LD-1000

*All Models—Control panel overhang 9" right side. LA & LC Models—Blower motor overhang 19" at rear. LB & LD Models—Blower motor overhang 19" at right side                               (26" on 7-1/2 HP) Gas Model—Burner overhang 11"; LA & LC Models - right side;                       LB & LD Models rear.

†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

Inner oven floor reinforced for loading and equipped with removable grating. Oven top surface constructed of 1/4" steel plate and work space interior equipped with wear bars to prevent damage during loading. Automatic door opening mechanism consisting of solid steel shaft, bearings and air cylinder system.

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. Exhaust outlet 4" diameter.

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. 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.

These electric or gas models come in four sizes. They feature full horizontal air flow with adjustable patented opposed louvers for balanced air flow. The horizontal air flow pattern allows heated air to pass between stacked parts for uniform heating. High volume recirculating blowers are specifically designed for heating heavy loads.

The removable grating on the oven floor protects the oven from impact during loading and distributes concentrated loads across the entire oven floor. The grating allows for air movement beneath the work for uniform processing.

The LA and LC Series have the heat chamber located to the rear of the work space. On the LB and LD Series, the heat chamber is located to the right side of the work space to position the supply and return duct work at the front and rear of the work space, respectively. This provides the shortest distance between ducts which minimizes the temperature differential across the work space.

1000°F Models Only
Insulated with 2" of 1900°F insulating block backed up with 1250° F industrial rockwool. 16 gauge aluminized steel work space interior; 304 stainless steel heat chamber interior with stainless steel recirculating blower. Gas models include stainless steel exhauster.

Circulation Diagram (Top View) Heated air is blown sideways between stacked parts

 

ADDITIONAL EQUIPMENT AVAILABLE  Back to Top
See Bulletin TC-960 for modifications and other optional equipment.

• Programmable Temperature Controller, microprocessor based, digital indicating, thermocouple actuated, in lieu of standard controller
  Option PTC3



• Recording Thermometer, thermocouple actuated, 24-hour, 10" diameter circular chart used in conjunction with standard controller
  Option RT



• Programmable Recording Temperature Controller, microprocessor based, thermocouple actuated, digital display, 24-hour, 10" diameter circular chart, in lieu of standard controller
  Option PRTC3



• Digital Timing System, incorporated into standard temperature controller, 99 hour 59 minute range, starts timing when temperature reaches set point and shuts down oven at end of set time
  Option DTS3



• Shut Down Timer, with continuous "hold" feature; 1, 5, 10 or 30 hour range
  Option SDT



• Batch Timer, for uniformly timing batch operations. Continuous alarm with door interlock; alarms at end of preset period until door is opened or timer reset; 1, 5, 10 or 30 hour range
  Option BT



• Automatic Door Switch, turns off blower and heat when door is opened. Restores blower and heat on electric models, blower only on gas models, when door is closed
  Option ADS



• Powered Forced Exhausters†

‡Gas ovens include 325 CFM exhauster, except 650 CFM on LD-1000. Electric ovens may require additional heat input.

 

 

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