How do you turn the bypass valve on / off ? What does 61F do?
The old style Autotrol By Pass Valves ( 156 used on 155 valves ) operate by using a "push in" method of redirecting the flow.
If you push the knob ( 46F ) IN on the RIGHT ( standing in front of the system ), this will place the valve in "by pass"
and cause the knob ( another 46F ) on the left to come out about an inch.
To "restore" flow through the Control Valve and resin tank, you would Push the knob on the Left back IN.
PUSHING the knob can require extreme force.
A hard "push" with your fist, or a "tap" with a hammer, may be required.
Sometimes engaging the By Pass fails to cut off the valve flow to the Control Valve 100%, because the internal o-rings in the center of the by pass shaft are not
sealing 100%. This common failure is the main reason Autotrol now uses a different design ( double shut off - redirecting valves ) for the "new" style By Pass
for their Control Valves.
The part labeled 61F does not "do anything". And I've never seen this used for anything.
NOTE: This BY PASS Style is not longer made, and the internal repair parts are obsolete.
*** Only o-rings ( 102N, 48F, and 49F ), and the Adapter tubes & nuts ( 54F, 55F, and 56F sold as SETS ) are parts still available for the older style By Passes.
Also Adapters ( 54F,55F,56F ) are still available and are sold in KITS ( pair of each of the 3 items )
The replacement By Pass is called the 256 and will fit both 155 and 255 valve bodies, but not 163, or 168.
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