A standard 40VA transformer is typically rated to handle up to four 1361 series zone valves

System Protection: Actively monitors flue gas temperatures to trigger safety shutdowns before overheating occurs

Always verify wire positions before disconnecting the old unit

This authentic Aprilaire replacement part is engineered to transport water from the solenoid valve to the distribution tray

Midco International 842518 Thermal Switch Kit 328140-751 A standard 40VA transformer isThe Midco International 842518 Thermal Switch Kit is a critical safety component designed for precise temperature regulation in power burners and industrial heating applications. As a genuine Midco OEM replacement part, this thermal limit switch acts as a primary fail safe, monitoring discharge air or internal housing temperatures to prevent catastrophic overheating. Field technicians rely on the 842518 for its calibrated response times and accuracy