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ATM TANK FILL AND PUMP STARTUP
1. After 23 hours, stop system flush by closing inlet
valve: rotate 90 degrees so that it points to the right.
2. Run 3/8" blue TO TANK tubing line to TANK INLET
through bracket so tank cover will close correctly.
Cut tubing to length allowing some slack for
maintenance of system and tank.
3. Install the end of the 3/8" blue TO TANK tubing line
to atmospheric tank ATM TANK INLET.
4. On RO processor, turn inlet valve to open position
(pointing down).
5. On tank, open ATM TANK INLET valve. Check for any
leaks at inlet valve or float switch. Repair if required.
6. Unplug tank power supply.
7. Open the ATM tank's 6" lid/access port and insert
optimized outlet 1/2" gray hose into tank to add
water to the ATM tank.
8. Turn the inlet valve and outlet valve to bypass
position (both pointing to the right). Hold hose
securely.
9. Add water to the tank until it is 1/4 full.
10. Once ATM tank is filled to approximately 1/4 full,
open inlet valve (pointing down) on the RO processor.
Water should stop flowing from gray hose. Reattach
gray hose to clean sink for flushing the buffer tank.
IMPORTANT: Keep outlet valve on the RO processor in
closed position (pointing to the right).
11. Connect power supply to wall outlet.
• Pump should begin to run and will flow water
from the pump into the buffer tank. The ATM tank
systems status should show a flashing green light.
Check to make sure ATM tank outlet valve is in the
open position.
• If light is flashing yellow, there is a possibility that
the low level sensor did not recognize water at first
power up. The flashing yellow light will flash for five
minutes then pump will activate again.
• If light is solid yellow, that indicates that the low-level
sensor does not see any water and the tank will need
to be filled higher before the pump will activate.
• Pump will shut down when buffer tank and line
reach 60 to 70 psi of pressure.
NOTE: It could be helpful to quickly open and close the
outlet valve on the RO processor to release any trapped
air in line. Two to three times should be fine. Release
trapped air and water out of the optimized outlet ½"
gray tubing into the drain or sink.
• Water will be filling the ATM tank now also from
RO processor. When filling without pump, system
status light will be blue.
PENTAIR EZ-RO INSTALLATION AND OPERATION GUIDE
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