Englander Vacuum Shut-Down Switch, PU-VS Compatible Stoves Englander 25-PDVC 55-SHP10 55-SHP10L American Standard 55-TRP10 25-PDV 25-PDVE 25-PDVP 55-SHP15 55-SHP22 55-SHP22L 55-TRP15 55-TRP22 American Heritage US 25-5670 25-PI 55-SHP20 55-TRP20 help control various functions of the unit If an operational error occurs in the unit, a switch will either stop the top (feed) auger or shut the unit off