this high-limit safety control prevents heat exchanger fatigue by breaking the 24V or 120V circuit to the gas valve or heating elements during restricted airflow conditions

Reliable Superheat Control: High-grade alloy construction minimizes wear on the cone and seat for long-term cycling

engineered to interrupt the burner circuit if internal plenum temperatures exceed safe operating parameters

Installation is straightforward for contractors during seasonal preventive maintenance: once the gas supply is isolated and the faceplate removed

Emerson Alco 027511 Lens Assembly this high-limit safety control preventsThe Emerson Alco 027511 Lens Assembly (Model X12978 1) is a critical service component designed for the upkeep and repair of moisture liquid indicators within commercial refrigeration and HVAC systems. When a moisture indicator lens becomes etched, clouded, or develops a leak, replacing the full assembly ensures accurate visual monitoring of refrigerant moisture levels and system charge. This kit includes the precision machined lens assembly, a