What temperature range is the high-limit cut-out often set between?

The high-limit cut-out is an essential safety feature in HVAC systems, particularly in heating appliances. It is designed to prevent overheating by shutting off the appliance if the temperature exceeds a certain threshold. The range between 200°F and 220°F is commonly set for this high-limit cut-out because it provides a balance between effective operational temperatures for hot water heating and ensuring safety.

Setting the cut-out at this range allows the system to work efficiently while also providing a significant buffer to prevent any potential risk of overheating, which can damage components or create safety hazards. Maintaining this temperature threshold ensures that the equipment operates safely while still delivering adequate heat output.

The other ranges listed may either be too low, leading to unnecessary cut-offs during normal operation, or too high, which could pose safety risks by allowing temperatures to reach potentially dangerous levels. Therefore, the specific selection of the 200°F to 220°F range strikes the necessary balance for reliable and safe HVAC operation.