Carrier HH11AZ070 Protectorelay 321702-401 Replacing a seized or noisy

Replacing a seized or noisy 70-42241-01 with this OEM-grade assembly restores the negative pressure draft required to pull combustion gases through the heat exchanger

While it is primarily used as a fan cycling pressure switch

preventing common leak points and mechanical fatigue in high-pressure steam

ensuring a long-term pressure-tight seal even in demanding hydronic or steam applications

the 50ZZ401127 operates on a standard 24V HVAC control circuit and provides reliable signal output to modulation motors

Carrier HH11AZ070 Protectorelay 321702-401 Replacing a seized or noisyThe Carrier HH11AZ070 Protectorelay is a critical combustion safeguard designed for precision oil burner primary control within residential oil furnaces and HVAC systems. As a genuine OEM replacement part, this protector relay ensures high limit protection and reliable ignition timing, maintaining the operational integrity of Carrier, Bryant, and Payne equipment. Engineered to interface seamlessly with cadmium sulfide (cad cell) flame sensors, the