Cross-compatible with 191990A/U indices

Built to satisfy SAE J513 standards

If the orifice is corroded or the opening is enlarged from improper cleaning

Always verify your boiler's BTU rating and altitude requirements before installation

eliminating the need for generic modifications

York S1-025-41322-000 Limit Switch Cross-compatible with 191990A/U indicesThe York S1 025 41322 000 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace and air handler heat exchangers. This OEM York furnace limit switch operates on an automatic reset logic with a calibrated temperature range of 120 160 degrees Fahrenheit. When the internal plenum temperature reaches the 160F high limit threshold, the bimetal disc triggers a circuit break to prevent heat exchanger fracturing or