Hellenbrand Iron Curtain System IC-10 Owner's Manual page 23

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Step 3. Bleeding Off the
Aeration System
The Iron Curtain Control Center
automatically shifts the controller
into the Aeration recharge cycle.
The air bleedoff valve opens up
and allows raw water and/or air to
pass thru the bleed off tube in the
AIR BLEEDOFF VALVE
aeration tank to the drain. The air
recharge valve is also open during
this time; however, a check valve
prevents any backflow toward the
compressor.
U.S. Patent #B1 5,096,596
Step 4. Recharge of Aeration
Tank with New Air
After approximately 2-4 minutes a
specially mounted switch in the
Iron Curtain Control Center turns
the air compressor pump on for
approximately 10 minutes. Water
and/or air continue to run to the
AIR BLEEDOFF VALVE
drain thru the air bleedoff valve
and the compressor pumps air
thru the air recharge valve,
directly into the aeration tank. At
the end of this cycle the aeration
tank has been recharged with
fresh air, and will have approxi-
mately an 18 inch head of air.
U.S. Patent #B1 5,096,596
23