Model: EWT03EH – Walk-In Oven

Operating Temperature

200°F (93°C) to 350°F (177°C)

Heating Medium

Electric, low watt density Incoloy® heaters provide years of trouble free service.  Standard heater bank assemblies are installed in high velocity ductwork to maximize heat transfer.

Airflow Pattern

Horizontal Airflow: Hot air is supplied from one side of the wall and pulled across horizontally to the opposite side wall.

Input Voltage

Standard: 480/3/60. Please consult factory for additional options.

Control System

LEWCO’s standard control package includes a single set-point process temperature controller and redundant high-limit controller. Circulation fan(s) and exhaust fan(s) include air proving circuits that are electrically interlocked with the heating circuit. All controls are housed in a NEMA 12 enclosure employing a full voltage lockable disconnect switch. Controls are wired to NFPA 70 and 79 electrical standards. Other third party certifications available.

Optional:

Door Switch
Disables heat when door is opened on electrically heated ovens; holds burner at low fire on fuel-fired ovens.

Batch Timer
Infinitely adjustable up to 100 hrs., includes illuminated On/ Off switch to indicate timed operation and audible alarm when time has elapsed.

Ramp/ Soak Controller
Programmable ramp/ soak temperature controller with capability to store different recipes with multiple segments.

Chart Recorder
Single pen circular paper chart recorder for continuous monitoring of temperature data. Comes with (1) Type “J” thermocouple input.

PLC
Programmable Logic Controller for processes with numerous inputs and outputs; or requiring automation of material handling equipment. The PLC can also allow for Ethernet connectivity for remote system monitoring.

Touchscreen HMI
Human Machine Interface provides the operator easy access and control of different parts of the equipment. Allows real time monitoring and provides feedback of the process in a visual, easy to read format.

Composite Curing Controls:

Data Logger: Multiple input digital data logger continuously records temperature and other process data. Allows downloading of digital data files through USB or Ethernet connection. Data can also be viewed on a full color display or on a web server when connected to a network.

Thermocouple Jacks: Thermocouple jack panel for high-temperature Type “J” thermocouples, located inside the oven. Includes wiring to data logger if purchased.

Vacuum Ports: ½” NPT thru-wall vacuum ports, each with vacuum rated manual ball valve and indicating gauge. All ports are connected to a 1” NPT header.

Vacuum Pump: Includes motor starter circuit and connection to vacuum header pipe.

Model (NFPA Class B) Overall Dimensions Door Swing Radius Workspace Dimensions Workspace Volume (cubic ft.) Heater Bank
(kW)
Circulating Fan
(CFM)
Motor
(HP)
Air Changes per Minute Exhaust Fan Capacity (CFM) Exhaust Motor (HP) Solvents per Batch
(Gals.)
Ships Fully Assembled
“W “D “H “W “D “H
EWT03EH-48-48-60
74 59 89 34″ 48 48 60 80 36 1,700 1 21.25 N/A N/A 0 Yes
EWT03EH-48-48-72
76 59 102 34″ 48 48 72 96 36 2,000 1 1/2 20.83 N/A N/A 0 Yes
EWT03EH-48-48-96
76 59 126 34″ 48 48 96 128 45 2,500 2 19.53 N/A N/A 0 Yes
EWT03EH-48-72-72
76 83 107 34″ 48 72 72 144 45 3,000 2 20.83 N/A N/A 0 Yes
EWT03EH-48-72-96
78 83 138 34″ 48 72 96 192 45 4,000 3 20.83 N/A N/A 0 Yes
EWT03EH-48-96-72 78 107 114 34″ 48 96 72 192 45 4,000 3 20.83 N/A N/A 0 Yes
EWT03EH-48-96-96 80 107 139 34″ 48 96 96 256 54 5,000 3 19.53 N/A N/A 0 Yes
EWT03EH-60-60-60
88 71 90 40″ 60 60 60 125 45 2,500 2 20.00 N/A N/A 0 Yes
EWT03EH-60-60-72
88 71 107 40″ 60 60 72 150 45 3,000 2 20.00 N/A N/A 0 Yes
EWT03EH-60-60-96 90 71 138 40″ 60 60 96 200 45 4,000 3 20.00 N/A N/A 0 Yes
EWT03EH-60-72-72
90 83 108 40″ 60 72 72 180 45 3,500 3 19.44 N/A N/A 0 Yes
EWT03EH-60-72-96 90 83 138 40″ 60 72 96 240 54 4,500 3 18.75 N/A N/A 0 Yes
EWT03EH-60-96-96 92 107 146 40″ 60 96 96 320 54 6,000 3 18.75 N/A N/A 0 No
EWT03EH-72-72-72
102 83 114 46″ 72 72 72 216 45 4,000 3 18.52 N/A N/A 0 Yes
EWT03EH-72-72-96 104 83 146 46″ 72 72 96 288 54 5,500 3 19.10 N/A N/A 0 No
EWT03EH-72-96-96 108 107 148 46″ 72 96 96 384 63 8,000 5 20.83 N/A N/A 0 No
EWT03EH-72-120-96
110 131 149 46″ 72 120 96 480 72 9,000 7 1/2 18.75 N/A N/A 0 No
Model (NFPA Class A) Overall Dimensions Door Swing Radius Workspace Dimensions Workspace Volume (cubic ft.) Heater Bank
(kW)
Circulating Fan
(CFM)
Motor
(HP)
Air Changes per Minute Exhaust Fan Capacity (CFM) Exhaust Motor (HP) Solvents per Batch
(Gals.)
Ships Fully Assembled
“W “D “H “W “D “H
EWT03EH-48-48-60
74 59 116 34″ 48 48 60 80 36 1,700 1 21.25 62 1/4 0.06 Yes
EWT03EH-48-48-72
76 59 102 34″ 48 48 72 96 45 2,000 1 1/2 20.83 62 1/4 0.06 Yes
EWT03EH-48-48-96 76 59 153 34″ 48 48 96 128 45 2,500 2 19.53 62 1/4 0.06 No
EWT03EH-48-72-72
76 83 134 34″ 48 72 72 144 45 3,000 2 20.83 62 1/4 0.06 Yes
EWT03EH-48-72-96 78 83 165 34″ 48 72 96 192 54 4,000 3 20.83 62 1/4 0.06 No
EWT03EH-48-96-72 78 107 141 34″ 48 96 72 192 54 4,000 3 20.83 62 1/4 0.06 Yes
EWT03EH-48-96-96 80 107 166 34″ 48 96 96 256 54 5,000 3 19.53 62 1/4 0.06 No
EWT03EH-60-60-60
88 71 117 40″ 60 60 60 125 45 2,500 2 20.00 62 1/4 0.06 Yes
EWT03EH-60-60-72
88 71 134 40″ 60 60 72 150 45 3,000 2 20.00 62 1/4 0.06 Yes
EWT03EH-60-60-96 90 71 165 40″ 60 60 96 200 54 4,000 3 20.00 62 1/4 0.06 No
EWT03EH-60-72-72
90 83 135 40″ 60 72 72 180 54 3,500 3 19.44 62 1/4 0.06 Yes
EWT03EH-60-72-96 90 83 165 40″ 60 72 96 240 54 4,500 3 18.75 62 1/4 0.06 No
EWT03EH-60-96-96 92 107 173 40″ 60 96 96 320 63 6,000 3 18.75 100 1/4 0.10 No
EWT03EH-72-72-72
102 83 141 46″ 72 72 72 216 54 4,000 3 18.52 62 1/4 0.06 Yes
EWT03EH-72-72-96 104 83 173 46″ 72 72 96 288 63 5,500 3 19.10 62 1/4 0.06 No
EWT03EH-72-96-96 108 107 175 46″ 72 96 96 384 72 8,000 5 20.83 100 1/4 0.10 No
EWT03EH-72-120-96
110 131 176 46″ 72 120 96 480 72 9,000 7 1/2 18.75 100 1/4 0.10 No

Note: Sizes are approximate. LEWCO, Inc. reserves the right to change specifications without notice.

Standard oven construction includes a 16 gauge aluminized steel interior with a 18 gauge cold rolled steel exterior. Heat loss is minimized by a unique wall design featuring a welded inner shell and a completely isolated outer frame and covers.

Doors

Heavy-duty doors on an isolated door frame minimize heat loss. Wire core gaskets create a tight seal for efficient heating. Standard doors are bi-parting swing at one end and include explosion venting latches.

     Standard Options:

  • Bi-parting swing doors at both ends
  • Vertical lift guillotine door at one or both ends
  • Door windows

Flooring

Standard ovens include a 12 gauge steel plate floor.

     Standard Options:

  • 12 gauge plate floor with (1) pair inverted angle track
  • 12 gauge plate floor with (1) pair 6” wide wheel guides
  • Insulated (100 p.s.f. max)
  • Insulated with (1) pair inverted angle track
  • Insulated with (1) pair 6” wide wheel guides
  • No floor

LEWCO industrial ovens are designed and manufactured to industry standards. Our engineers regularly work to keep updated with the latest revisions in industry codes. If there is a specific industry standard or code compliance that you require for your process heating application, please contact one of our highly knowledgeable applications engineers to learn how LEWCO can help!

About NFPA 86

The National Fire Protection Association’s standard, NFPA 86, documents the guidelines for the safe operation of industrial ovens and furnaces. All LEWCO ovens are designed and manufactured to meet the requirements of this standard. Oven and furnaces in which flammable volatiles or combustible materials are present in the work space are classified by NFPA 86 as “Class A.” Similarly, ovens and furnaces in which no flammable volatiles or combustible materials are present are classified as “Class B.” Due to the risk of fire or explosion, NFPA 86 requires specific safety equipment for all Class A ovens and furnaces. Fuel gas-fired ovens and furnaces also require safety equipment.

  • Powered exhaust of capacity determined by maximum solvent loading.
  • Explosion relief of adequate area determined by oven or furnace workspace volume.

Industry Standards