Stove idle timer1/5/2024 In addition, the following items are required: If the primary contactors become fouled or fused, the backup contactors will ensure that the heaters shut down if an over-temperature condition occurs.ĬLASS A ELECTRICALLY HEATED OVEN REQUIREMENTSĮlectrically heated Class A ovens and furnaces must have all of the safety controls specified for Class B. Should the unit produce too much heat the hi-limit switch will trip and shut down the heaters once the excess temperature setting is reached.īackup Contactors – These are required as a fail-safe. Manual Reset Excess Temperature Control – Commonly known in the industry as a hi-limit control, this control should be set approximately 50☏ (10☌) higher than the oven setpoint or maximum rated temperature. This prevents the heat source from continuing to operate without recirculation air moving past it. With working definitions established, let’s look at how they impact the way industrial ovens and furnaces are designed, equipped and applied.ĬLASS B ELECTRICALLY HEATED OVEN REQUIREMENTSĮlectrically heated Class B ovens must be equipped with the following safety equipment:Īirflow Safety Switch – An airflow safety switch should be integrated into the recirculation fan assembly, where it will shut down the unit should the fan cease operation. Oven safety - what’s in it for you? A lot more than one might think. However, the long-term battle to be safe is so often won and lost by small, seemingly insignificant practices (like bypassing a simple switch) that occur day-to-day. SAFETY is a big word - Safety is a broad-brush concept that has been drummed into the collective industrial conscience for quite some time. The economic, legal and moral repercussions of such an accident can be widespread, and the shock waves often are far reaching - not only within the company, but in the individual lives with which your company is intertwined. Most important, though, is the human element - an employee, just someone trying to make an honest living - may be hurt, incapacitated or killed. The building itself may be damaged due to flame or the sheer force of the event. Other equipment may become damaged or inoperable. This would damage the oven, surely, but what of the other costs? If flammable fumes build up in the oven’s work area, an explosion can take place. Life becomes an even more dangerous and random game of chance - like Russian roulette with only one empty chamber.įor example, if just one safety is jumpered - say, an airflow switch - the likelihood of an accident occurring has increased exponentially. Reality: Everyone is impacted and everything is at stake, every single day - reputation, bottom line, personnel confidence and morale, market position, profit, marketing, cost accounting, insurance rates, and corporate survival.ĭisregarding industrial oven safety features or removing safeguards is inviting disaster through your company’s front door. The answer to that question is really another question: What’s not in it for you? It is important to note that this list is not all-inclusive rather, it serves as an overview of the types of materials or processes that are considered Class A in nature.
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