Whether you are servicing Trane rooftop units or air-cooled chillers

diaphragm delivers consistent force for positive valve positioning

reducing diagnostic time for pressure switch failure calls

Optimized Pressure Control: Pre-calibrated 6" WC setting for liquid propane applications ensures efficient burner operation and reduced soot buildup

Enhanced Safety: Provides a dedicated local means of disconnect to protect technicians from live power during internal component replacement

Carrier HH19ZA940 Limit Switch 320788-702 Whether you are servicing TraneThe Carrier HH19ZA940 Limit Switch is a critical OEM safety component engineered for precise thermal regulation within Carrier fan coil units, packaged systems, and secondary heating assemblies. This 85 140 degree limit switch operates as a normally closed (NC) safety, opening the circuit when the sensed temperature exceeds 140F to prevent heat exchanger or coil damage. Once the system cools back to 85F, the automatic reset limit switch closes the