What is the main cause of chattering in the primary control?

Chattering in the primary control of an oil heating system is primarily caused by low voltage. In a heating control system, proper voltage levels are essential for reliable operation of relays and contactors. When the voltage is insufficient, the control components may not operate correctly, leading to rapid on-off cycling known as chattering. This can occur because the relay coil does not receive enough power to hold the contact closed, causing it to drop out repeatedly.

Low voltage can originate from various sources, such as an inadequate power supply or long wiring runs that cause voltage drops. Ensuring that the voltage is within the operational specifications for the equipment can prevent this chattering and ensure stable operation of the heating system.

High voltage, incorrect wiring, or a faulty control unit may lead to other issues; for example, high voltage can cause overheating or failure of components, while incorrect wiring can prevent the system from functioning at all. A faulty control unit might stop operating properly, but in this case, the specific cause of chattering is tied most closely to issues of low voltage.