Ro Water Filter Tank Pressure

Reconnect the yellow line at point y.

Ro water filter tank pressure.

Most standard reverse osmosis tanks are three to four gallon tanks that work best when the pressure in them is between six and ten pounds per square inch psi so the magic number that we are shooting for is eight pounds of pressure. If your feed pressure is 60 psi the membrane will continue to filter water and fill the storage tank until the compressing air within that tank reaches 40 psi. Close the tank s ball valve. It takes 4 hours to produce 2 gallons of water.

You have to empty the tank of water in order to check the air pressure. Using a pressure gauge check the air pressure in the tank. Point y on figure 1. Additionally production is reduced whenever the water temperature is below 77 f.

The reverse osmosis system is equipped with a sensory valve that halts the production of water when the pressure in the tank reaches 2 3 of the line pressure. You might have low air pressure inside the ro tank itself. Locate the pressure valve under the blue cap on the tank. Your tank should have pressure of 7 to 8 psi without any water in the tank.

In the pnrv18 model the tank holds approximately 1 5 gallons and in the pnrv model it holds 2 1 gallons. The standard air charge for undersink ro tanks is about seven psi when there is no water in the tank. Use an air pressure gauge to check the current air pressure. Turn off the feed water supply to the ro.

To check your pressure locate the schrader valve typically covered by a blue plastic cap on the side of the tank near the bottom. Most ro units have an automatic water shutoff that kicks in when the pressure inside the tank reaches 2 3 of the pressure of the water flowing from your main line into the ro system. Disconnect the yellow line from the tank valve. You can find these at auto parts stores or hardware stores.

It should be around 5 psi for a standard 4 gallon tank 3 2 gallon capacity. Use air compressor or bicycle pump to re pressurize the 4 gallon tank to 5 psi and 7psi for the 14 gallon tank. To check the pressure accurately you need a low pressure air gauge. If your city water pressure is around 50 psi the system will shut off water production when the tank reaches a pressure of 30 or so psi.

Allow four hours for the tank to fill and try again. Private well systems most commonly have pressurized storage tank and pump systems with 20 40 psi or 30 50 psi on off pressure settings. Drain the old tank completely thru the spigot. Open the cap at the bottom of the tank to access the pressure valve.