Air Volume Control (AVC) Adjustment Procedures
How to adjust the air volume control keep the proper air charge in the water pressure tank
AIR VOLUME CONTROL ADJUSTMENT- CONTENTS: how do I adjust the air volume control to keep the proper amount of air in a bladderless water tank? Too much air leads to air discharge at the faucets. Too little air leads to well pump short-cycling and damage. Some AVCs are adjustable and can be re-set if needed, as we explain here.
How is the US Gauge Type WJ Air Volume Control Adjusted?
The simple disc-type AVC shown at the top of this page is not adjustable. But some models can be adjusted, as we describe here.
Turning the US Gauge WJ AVC screw counter-clockwise: Loosening the lock nut and turning the center adjusting screw counter-clockwise (backing the screw out, or to the left) will increase the amount of air vented from the tank or the rate at which it is vented until rising water level in the tank closes the valve.
The result will be less air in the water pressure tank - which you want basically and only if excess air is blowing out of the home faucets.
Turning the US Gauge WJ AVC screw clockwise: If your well pump is short cycling (meaning you want more air in the pressure tank) you want to turn the screw clockwise (to the right, or "in")
This will decrease the amount of air vented from the tank at each pump cycle, increasing the air volume in the pressure tank.
Here's one more photo of a (probably not working) air volume control attachment on a water tank, to help you
recognize just what these devices may look like.
Does My Water Tank Use an Internal Bladder? Not if It's Using an AVC.
Remember if you see this device on your water tank, the tank is
not a bladder-type or "captive air" or "Well-X-Trol" ™ type water tank.
It's an older steel water tank wherein the
air charge is ultimately lost either by absorption into the water passing through the tank or by leaks.
Watch out: On a water tank that uses an internal bladder (keeping water and air separated), the air charge is not normally lost and the air volume does not normally need adjustment.
And you couldn't retrofit one of these devices anyway - no place to mount it, and no room for the float to move - just no way.
Try the search box below or CONTACT US by email if you cannot find the answer you need at InspectApedia.
Ask a Question or Search InspectApedia
Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.
 U.S. Gauge Special Application Gauges: Type 300L and 310WJ Air Volume Controls, product description, 2002, Ametek® Inc, U.S. Gauge, 820 Pennsylvania Blvd., Feasterville PA 19053, USA, Tel: 215-355-6900 www.ametekusg.com Customer Service: 863-534-1504, web search 03/23/2011, original source: http://www.jlwinstruments.com/PDF_files/D17_MODEL300-310.PDF Sadly this URL now reroutes to a dead end
 AMTEK, 900 Clymer Avenue 8600 Somerset Drive
Sellersville, PA 18960 U.S.A. or Customer Service at AMTEK, Largo, FL 33773 U.S.A.Sales/Technical Support: 215-257-6531, Customer Service: 727-536-7831, Website: www.amtekusg.com, Email US Gauge at email@example.com.
 flosource.com/ provides links to some US Gauge air volume control products installation and adjustment
Rasmussen Well Drilling, Inc., 1793 Hwy 61, Two Harbors MN. Jeremy Rasmussen provides third generation well drilling and plumbing services on the North Shore of Lake Superior. Photos by DJF. Tel 218-834-3387. Email: firstname.lastname@example.org
We serve the north Shore – Lake, Cook, St. Louis, Carlton and Pine counties, including Duluth, Grand Marais, Clouqet, Carlton, Finland, Isabella, Silver Bay, Grand Portage, Saginaw, and everywhere in Northeastern Minnesota.
 Dill Air Controls Products, 1500 Williamsboro St., PO Box 159, Oxford, NC 27565, Tel: (919) 692‐2300, Website: http://dillaircontrols.com
Smart Tank, Installation Instructions, Flexcon Industries, 300 Pond St., Randolph MA 02368, www.flexconind.com, Tel: 800-527-0030 - web search 07/24/2010, original source: http://www.flexconind.com/pdf/st_install.pdf [Copy on file as /water/Smart_Tank_Flexcon.pdf ] -
Typical Shallow Well One Line Jet Pump Installation, Grove Electric, G&G Electric & Plumbing, 1900 NE 78th St., Suite 101, Vancouver WA 98665 www.grovelectric.com - web search -7/15/2010 original source: http://www.groverelectric.com/howto/38_Typical%20Jet%20Pump%20Installation.pdf, [Copy on file as /water/Jet_Pump_Grove_Elect_Jet_Pumps.pdf ] -
Typical Deep Well Two Line Jet Pump Installation, Grove Electric, G&G Electric & Plumbing, 1900 NE 78th St., Suite 101, Vancouver WA 98665 www.grovelectric.com - web search -7/15/2010 original source: http://www.groverelectric.com/howto/38_Typical%20Jet%20Pump%20Installation.pdf, [Copy on file as /water/Jet_Pump_Grove_Elect.pdf ] - Cooperative Extension, School of Forest Resources, web search 07/24/2010, original source: http://pubs.cas.psu.edu/FreePubs/pdfs/XH0002.pdf
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: email@example.com. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. Special Offer: For a 5% discount on any number of copies of the Illustrated Home purchased as a single order Enter INSPECTAILL in the order payment page "Promo/Redemption" space.
TECHNICAL REFERENCE GUIDE to manufacturer's model and serial number information for heating and cooling equipment, useful for determining the age of heating boilers, furnaces, water heaters is provided by Carson Dunlop, Associates, Toronto - Carson Dunlop Weldon & Associates Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on any number of copies of the Technical Reference Guide purchased as a single order. Just enter INSPECTATRG in the order payment page "Promo/Redemption" space.
The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume.
Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on these courses: Enter INSPECTAHITP in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
The Horizon Software System manages business operations,scheduling, & inspection report writing using Carson Dunlop's knowledge base & color images. The Horizon system runs on always-available cloud-based software for office computers, laptops, tablets, iPad, Android, & other smartphones