Quiet Performance: Engineered for minimal harmonic vibration

range allows for exact calibration to specific burner requirements

Operating at 120/240V single-phase power

this kit is specifically engineered for the unique bolt patterns and sealing surfaces of Raypak heat exchangers

Enhanced Durability: Constructed from corrosion-resistant steel to withstand harsh rooftop exposures and chemical environments

Carrier HH18HV185 Limit Switch 320819-301 Quiet Performance: Engineered for minimalThe Carrier HH18HV185 is a high precision 155 185F auto limit switch designed for critical thermal protection in heating and air conditioning systems. As an essential safety component, this disc style HVAC limit switch replacement monitors ambient temperatures within the furnace or air handler, featuring a factory calibrated cut out temperature of 185F. Upon reaching this threshold, the switch interrupts the electrical circuit to prevent heat