Troubleshooting FAQ


My Nitrogen Separator is making a “Ding Ding” sound?

GAS Nitrogen Separators are equipped with an over-run alarm. Most often the alarm is telling you about possible leaks in your kegged beer or wine system as well as monitoring internal operation. Most commonly a tapping device left off of a keg leaking gas is the source of the alarm. Check keg cooler for leaks using “bubbly” glass cleaner while spraying for leaks.

What do I do if I think there is a problem?

Do not worry! Green Air Supply is there when you need us! Simply push the “CALL” button on the separator’s touch screen and call our service number listed on the screen. You can also try using the “Beer Trouble Shooter”  by pushing the “More” button on the touch screen to narrow down any possible issues you are experiencing.

I see ice on the side of the Bulk CO2 tank?

Frost is normal during periods of high usage. Continuous ice accumulation is a sign that there is a steady CO2 leak somewhere downstream from the CO2 tank. Record CO2 system gauge readings and call your CO2 service providor number for additional support.

Why is my beer foamy or flat?

Most often problems in temperature are the cause of foamy or flat beer. Either too cold or too warm of a keg cooler will cause foamy beer. Other common problems are incorrect gas blends, gas pressures or the gas supply has been shut off in the cooler. Contact your local draught beer technician or call our service number for further assistance.

Am I out of Nitrogen?

Find your Nitrogen Separator for your beer/ wine system and locate the “Nitrogen Pressure” gauge located on the bottom right face of the green separator box. If it reads 80 psi or higher you are not out of nitrogen. If the “Nitrogen Pressure” gauge reads below 80 psi call your local service provider or GAS 1-877-427-4361

Am I out of CO2?

Locate the Gauge on the bottom left of your GAS Separator marked “CO2 Pressure”. If indicator needle is below 90 psi you are out of CO2. Call your CO2 provider’s service number or change your CO2 cylinder.

What temperature should my keg cooler ideally be?

As a general rule of thumb, beer kegs should be stored at a consistent 38F. If warmer or colder beer dispense is desired, please contact one of our Beverage Dispense experts to advise you in how to accomplish this without causing flat or foamy beer. In most cases, mixed gas from Green Air Supply Nitrogen Separators can help compensate for temperatures outside the normal range.

Is the mix of 70% CO2/30% nitrogen right for my beer?

Not unless you have exactly 24 pounds of keg pressure and your keg cooler keeps a 38F beer temperature. In reality no one blend is correct for all draught beer system conditions.

The correct method for blend calculation is tuning the blend to the given draught system’s conditions i.e. Keg temp, keg pressure and beer type

We invite these conversations and really enjoy having them!

Please call us anytime to talk draught beer quality!


Is the mix of 25% CO2/75% nitrogen right for my non-stout beers?

While 25% CO2 is perfect for your stout creamed beers it is absolutely not acceptable for any normal ale or lager type of beer. The result will be under carbonated or flat beer.

The perfect ratio of CO2/ nitrogen is customized for your exact draught beer system. Typically 50-85% CO2 will be the range for most long draw beer keg systems. Each beer system has its own ideal mix ratio to deliver the perfect pint. Green Air Supply’s Beer Quality Experts can calculate your ideal gas mix and assist you in how to increase your draught beer system profits.

Does it really matter what gas and pressure I use on my beer kegs?

Absolutely! The correct gas mix and gas pressures will dictate the profitability of your draught beer system. Improper gas types or mixes and incorrect gas pressures will cause undesirable outcomes including over-carbonation, foamy beer, flat beer and general customer dissatisfaction.

In most situations tuning a draught beer system to 2 oz per second at the beer faucet is a base line to start with.Adjust keg pressure such that a 16 oz pint is filled in 7-9 seconds. Generally speaking this will give you the correct keg pressure.

That gauge pressure can then be used to determine the correct gas blend. Call GAS for assistance anytime!


I think there may be a CO2 leak. What should I do?

If you suspect a leak in your CO2 or beverage system, first open any outside doors to ventilate out any possible carbon dioxide build ups. CO2 displaces oxygen and does not support life.  CO2 is heavier than air and will collect in low-lying areas such as basements and stairwells.  Special care should be taken before entering enclosed spaces such as coolers, closets or basements.  These spaces should be well ventilated before entering to check CO2 supply or to look for leaks. If a life threatening situation is apparent call 911 immediately.

What do I do if I think there is a beverage gas leak inside of my business location?

First, be aware of any possible confined spaces that may be accumulating high concentrations of CO2 or nitrogen. CO2 and nitrogen displace oxygen and do not support life.  Keg coolers, closets, basements and enclosed rooms should be aired out thoroughly before entry. If you suspect there is any chance of an accumulation of any type of compressed gas do not enter that area ever! If you can, shut off the gas supply that feeds the leak without placing a person at risk of entering a confined space. If you can not safely shut off the gas supply to the leak and you think there is a safety concern, contact your local fire department for assistance. You should also call our support staff for further assistance and instructions. Main Office 877-427-4361 or use the number listed on your separator by pushing the “CALL” button on the touch screen panel.