Tjernlund Products PS1505 Prover Switch 326058-757 making it ideal for rapid

making it ideal for rapid tank replenishment in HVACR and cooling tower applications

making it a critical component for commercial air handling units and rooftop unit freeze protection

The 4PDT configuration is ideal for complex interlocking circuits or simultaneous signaling of various HVAC components from a single trigger

ensuring drop-in compatibility with legacy and current 1/2" NPT configurations

Standardized Frame: The NEMA 42Y frame ensures accurate mounting and alignment in existing brackets

Tjernlund Products PS1505 Prover Switch 326058-757 making it ideal for rapidThe Tjernlund Products PS1505 Prover Switch is a critical safety interlock designed specifically for Tjernlund Auto Draft inducers. As a veteran grade fan proving safety switch, it monitors vacuum pressure within the fan housing to verify that the inducer is operating at peak performance before allowing the burner circuit to fire. This SPST air pressure switch features a non adjustable set point of 0. 05" 0. 02" W. C. (increasing vacuum), ensuring