Air and debris in a geothermal loop system can lead to system pump failure or nuisance noise in the home or building. Air and dirt elimination starts with proper flushing/purging using a professional flush cart equipped with sufficient filtering equipment. If completed properly, this flushing process should be sufficient to remove all of the air and debris in the loop system, particularly smaller residential systems. However, even with good system flushing/purging, small amounts of air or debris may remain in the system after the initial flush procedure or may enter the system during follow-up system maintenance (for example, when bumping system pressure with a tool or replacing a pump). Installing a properly designed air and/or dirt separator provides long-term protection against pump failure.

Geo-Flo offers air separator assemblies that include coalescing media to remove air from the system, a blow-down/fill valve that allows trapped debris to be safely removed from the system, and a connection point for an expansion tank. The blow-down/fill valve includes a garden hose adapter to allow the system pressure to be “bumped” to maintain a positive system pressure (pressurized flow center systems only). This valve also provides a convenient access point for removing system fluid to check antifreeze levels and water quality.

Part Number	Separator Type and Size	Inlet Conn. Size	Inlet Conn. Type	Outlet Conn. Size	Outlet Conn. Type
ASL-04B-04FP04FP	1"	1"	FPT	1"	FPT
ASL-04B-05SF05SF	1"	1-1/4"	Socket Fusion	1-1/4"	Socket Fusion
ASL-04B-05SV05SF	1"	1-1/4"	Socket Fusion W/ISO. Valve	1-1/4"	Socket Fusion
ASL-08B-08FP08FP	2"	2"	FPT	2"	FPT
ASL-08B-08SF08SF	2"	2"	Socket Fusion	2"	Socket Fusion

Geo-Flo, Auto Air Vent, 1/2" FPT and 3/4" NPT