US 11,788,807 B2
Apparatus and method for cleaning HVAC cooling coils
Arthur J. Dwight, Sumter, SC (US); and Rudolph Singleton, Sumter, SC (US)
Assigned to Coil Flow Max, Inc., Sumter, SC (US)
Filed by Coil Flow Max, Inc., Sumter, SC (US)
Filed on Sep. 28, 2022, as Appl. No. 17/954,727.
Application 17/954,727 is a division of application No. 16/745,253, filed on Jan. 16, 2020, granted, now 11,486,663.
Application 16/745,253 is a continuation of application No. 15/392,885, filed on Dec. 28, 2016, granted, now 10,539,381.
Claims priority of provisional application 62/340,277, filed on May 23, 2016.
Claims priority of provisional application 62/280,980, filed on Jan. 20, 2016.
Claims priority of provisional application 62/271,839, filed on Dec. 28, 2015.
Prior Publication US 2023/0016318 A1, Jan. 19, 2023
Int. Cl. F28G 1/16 (2006.01); F28G 15/00 (2006.01); B08B 3/02 (2006.01); B08B 3/14 (2006.01); B01D 21/26 (2006.01); B08B 17/02 (2006.01); F28G 9/00 (2006.01)
CPC F28G 1/166 (2013.01) [B01D 21/267 (2013.01); B08B 3/024 (2013.01); B08B 3/14 (2013.01); B08B 17/025 (2013.01); F28G 9/00 (2013.01); F28G 15/003 (2013.01); F28G 2015/006 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of cleaning an HVAC coil unit located above a drain basin, said method comprising steps of:
providing a supply and collection assembly having a reservoir containing liquid cleaning solution, a pump operative to output the liquid cleaning solution through a supply outlet, and a vacuum source operative to draw in used liquid cleaning solution through a collection inlet;
providing a nozzle device in fluid communication with the supply outlet, said nozzle device having a delivery face;
providing a fluid return tool in fluid communication with the collection inlet, and positioning the fluid return tool in the drain basin; and
moving the delivery face of the nozzle device across a surface of the HVAC coil unit to deliver the cleaning solution into areas between fins thereof in a volume of at least 40 gallons per minute.