Description
This is a BRAND NEW OEM Lennox/Armstrong/Ducane Gas Furnace Air Pressure Switch. The Part # is 49L90 (also49L9001 ) & the Honeywell # is IS20100-3072. It is rated at 0.47" W/C PF. Switch has 1 hose port and 2 wiring terminals.
Function:
An air switch is safety designed to ensure that your inducer motor is running at the proper RPM, and creating the proper vacuum for your furnace to flue safely.
Replaces Old Part #s:
49L90 49L9001
Repair Difficulty Level:
Partial List of Units that Use This Item:
Hit Ctrl+F and enter your model number for a quick search!