the Belimo S2A-GV auxiliary switch is a solid choice

ensuring seamless integration with existing Lennox air handlers

Unusual screeching or grinding noises often indicate bearing failure

Durable Construction: Metal case and high-quality internal components are designed for long-term operation in demanding outdoor HVAC environments

Tjernlund Products 950-0029 Pressure Switch 320734-701 the Belimo S2A-GV auxiliary switchAs a veteran HVACR technician, you know that keeping a side wall venter system online depends on precise airflow verification. The Tjernlund 950 0029 Pressure Switch is the mandatory fan proving switch designed specifically for Tjernlund SS2 venter systems. Featuring a non adjustable set point factory calibrated at . 40 W. C. on pressure drop, this replacement air pressure switch ensures the burner only fires when the draft inducer has established