A large international manufacturing company will use two walk-in ovens to heat up molds, each weighing approximately 900 lb, to 220°F (105°C). Inside each oven is a custom rack with five shelves capable of handling up to five molds per batch.
Designed and shipped by Lewco Inc., the preheating ovens include a rear-mounted heater box with a heat capacity of 72 kW. Both units are equipped with an 8,000-cfm high efficiency circulation fan, delivering dual airflow evenly throughout the workspace. The ovens are furnished with zero speed switches on the fans in place of differential-pressure switches, eliminating possible shutdowns.
Controls for both ovens and a custom 10-zone conveyor, also provided by LEWCO/ are operated from a remote touchscreen HMI. Each oven includes a local control panel mounted to the rear wall. The local control panels include all motor starter circuits, temperature controls, PLC and safety circuits. Each PLC communicates via Ethernet to the remote touchscreen HMI. A large LED digital batch-timer display is mounted to the roof of each oven, displaying the time remaining in each batch.