AAON LZ Series, Installation Operation & Maintenance

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Step 8. Open valve to balance set point as
recorded in Step 1.
Note: On valve sizes of 2-1/2 inch and 3
inch, the full open position is 5 turns,
though the valve will open to 5-1/2 turns
which is just back of seating of valve.
Seat Replacement
Step 1.
Drain the system and remove valve
from piping.
Step 2.
Remove the body bolts from the body
using an Allen Key.
Step 3.
Remove seat and O Ring. O rings are
not used on valves of 8 inches or larger.
Step 4.
Inspect and clean O ring cavity and
install new O ring and seat. Valve disc stem
should be inspected and replaced if worn.
Valve stem O ring should be replaced at this
time as discussed under Repacking of Flo-
Trex section.
Pressure-Temperature Limits