Lennox 11U71 Pressure Switch 321894-706 close on fall refers to
Baker’s notes & crumb story
Description
Lennox 11U71 Pressure Switch 321894 706 close on fall refers to close on fall refers to the switch making electrical contact as the pressure "falls" further into a negative vacuum (becoming more negative) to reach the set points of Designed with 1 3 8 inch ODF suction and 7 8 inch ODF discharge brazed connections