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Top Loading Ovens

BULLETIN
CA-450

HEAVY DUTY
ELECTRIC AND GAS
HORIZONTAL AIR FLOW
TOP LOADING OVENS

 



For annealing, preheating, baking or any other heat processing where overhead handling equipment is used. Temperatures to 1050°F. Full opening door exposes entire work space for easy loading. Constructed for long, hard, continuous use. Ideal for severe service applications — load capacities up to 4000 lbs .

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
— LED pilot lights
• Safety Equipment — Electric Oven
— Adjustable, thermocouple actuated, manual reset excess temperature interlock
— Separate heating element control contactors
— Recirculating blower air flow safety switch

 • Safety Equipment — Gas Oven
— Adjustable, thermocouple actuated, manual reset excess temperature interlock
 — Electronic flame safeguard protection
— 325 CFM 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
— Valve position indicator on main safety shutoff valves
—Over 400,000 BTU/HR safety shutoff valve interlocked with purge timer

• Construction
—Adjustable opposed louvers on full coverage supply and return duct work
—Automatic air operated door
—1/4" steel plate top prevents loading damage
—Wear bars at sides of work space
—Reinforced floor with removable grate
—10 lbs/cf density industrial rockwool insulation
—Aluminized steel interior
—Aluminized steel exterior with enamel finish
—Brushed stainless steel control panel face
—Adjustable fresh air intake and exhaust dampers
—High temperature door gasket with stainless steel spring insert
—All welded construction
—Low profile minimizes interference with loading equipment
—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
Floor
Loading
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
LA-550
 36" x 36" x 36" 27 59" x 87" x 52" 550°F 1500 1-1/2 6" 1000 15 100,000 ±0.3% ±6°F      38 min 24 min 2280 lbs
LA-700
 36" x 36" x 36" 27 61" x 89" x 54" 700°F 2000 2 7" 1000 20 150,000 ±0.3% ±8°F      44 min 26 min 2795 lbs
LA-850
 36" x 36" x 36" 27 63" x 93" x 56" 850°F 3000 2 8" 1000 30 250,000 ±0.3% ±10°F      57 min 27 min 4120 lbs
LA-1050
 36" x 36" x 36" 27 69" x 97" x 60" 1050°F 4000 3 10" 1000 40 300,000 ±0.3% ±12°F      60 min 33 min 5865 lbs
LB-550
 72" x 36" x 36" 54 121" x 59" x 52" 550°F 2450 1-1/2 6" 2000 30 250,000 ±0.3% ±6°F      30 min 22 min 4665 lbs
LB-700
 72" x 36" x 36" 54 123" x 61" x 54" 700°F 3300 2 7" 2000 40 300,000 ±0.3% ±8°F      35 min 19 min 5585 lbs
LB-850
 72" x 36" x 36" 54 127" x 65" x 56" 850°F 4000 3 8" 2000 60 400,000 ±0.3% ±10°F      47 min 26 min 7320 lbs
LB-1050
 72" x 36" x 36" 54 131" x 71" x 60" 1050°F 5000 5 10" 2000 80 600,000 ±0.3% ±12°F      52 min 28 min 8475 lbs
LC-550
 48" x 48" x 48" 64 71" x 99" x 64" 550°F 2450 1-1/2 6" 2000 30 250,000 ±0.3% ±6°F      35 min 18 min 4995 lbs
LC-700
 48" x 48" x 48" 64 73" x 101" x 66" 700°F 3300 2 7" 2000 40 300,000 ±0.3% ±8°F      40 min 20 min 5915 lbs
LC-850
 48" x 48" x 48" 64 77" x 105" x 68" 850°F 4000 3 8" 2000 60 400,000 ±0.3% ±10°F      52 min 28 min 7855 lbs
LC-1050
 48" x 48" x 48" 64 83" x 109" x 72" 1050°F 5000 5 10" 2000 80 600,000 ±0.3% ±12°F      57 min 26 min 9005 lbs
LD-550
 96" x 48" x 48" 128 145" x 73" x 64" 550°F 4200 3 6" 4000 60 400,000 ±0.3% ±6°F      24 min 14 min 7445 lbs
LD-700
 96" x 48" x 48" 128 147" x 77" x 66" 700°F 6000 5 7" 4000 80 600,000 ±0.3% ±8°F      27 min 16 min 8880 lbs
LD-850
 96" x 48" x 48" 128 159" x 83" x 68" 850°F 7800 5 8" 4000 100 700,000 ±0.3% ±10°F      46 min 25 min 11660 lbs
LD-1050
 96" x 48" x 48" 128 163" x 91" x 72" 1050°F 10000 7-1/2 10" 4000 120 800,000 ±0.3% ±12°F      52 min 30 min 14740 lbs
*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).
LA & LC Models—Additional height with door open 58".
LB& LD Models—Additional height with door open 70".
Gas Models—Burner overhang 15" left side; LA & LC Models right side; LA & LC 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

• All Models
— 208 volts, 3-phase, 60 Hz
— 230 volts, 3-phase, 60 Hz
— 460 volts, 3-phase, 60 Hz
— Other electrical characteristics available

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. Requires 60 psig compressed air.

• 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 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.

• 1050°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 Diagrams
(Front View)

Heated air blown sideways
between stacked parts


• Automatic Door Switch, turns off blower and heat when door is opened. Restores blower and heat when door is closed
Option ADS

• Roof Mounted Powered Forced Exhausters
with exhauster air flow safety switch†

Capacity HP Outlet
Diameter		 Height
130 CFM 1/3 4" 20"
325 CFM 1/3 6" 23"
650 CFM 1/2 6" 23"
975 CFM 1 8" 23"
†Gas ovens include 325 CFM exhausterr, except
650 CFM on LD-1000.
Electric ovens may require additional heat input.

 
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

 


• Digital Timing Temperature Controller, microprocessor based, digital indicating, incorperates 99 hour 59 minute timer. Starts timing when temperature reaches set point and shuts down oven at end of set time
Option DTS3

• Digital Shut Down Timer, with continuous "hold" feature
Option SDT

• Digital 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
Option BT
 
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Specifications Subject to Change Without Notice
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