Daikin MicroTech III Operation Manuals page 106

OAD End Switch Calibration
The outdoor air damper end switch input requires a calibration
function that captures the command position at which the
switches open and close at the closed and open ends of the
damper modulation range . This function consists of a manually
initiated sequence that strokes the dampers fully open and
then fully closed and detects the changes of state of the
switch input and records the points where changes occur .
The sequence must be initiated while the Unit State is Off and
starting with the end switch input in the closed position .
OM 920-6 • MICROTECH UNIT CONTROLLER
When the CalibrateOAD parameter is set from No to Yes the
following sequence occurs:
Step 1: The damper command is increased 1% every 2
seconds until the OAD End Switch input opens .
Step 2: The damper command is then be decreased 1%
every 2 seconds until the OAD End Switch input
closes . At this point the current command % is
captured .
Step 3: The damper command is increased 1% every 2
seconds until the OAD End Switch input opens . At this
point the difference between the current command %
and the damper end switch closed value is captured .
Step 4: The damper command is increased and held at 100%
until the OAD End Switch input closes .
Step 5: The damper command is decreased 1% every 2
seconds until the OAD End Switch input opens .
Step 6: The damper command is increased 1% every 2
seconds until the OAD End Switch input closes . At
this point the current command % is captured .
Step 7: The damper command is decreased 1% every 2
seconds until the OAD End Switch input opens . At
this point the difference between the damper open
end switch value and current command % value is
captured .
Step 8: The damper command is decreased and held
at 0% until the OAD End Switch input closes at
which point the values captured in Step 2, Step 3,
Step 6 and Step 7 are written to the damper end
switch open (PosSwOpen%), Minimum switch
differential (MinSwDiff), damper end switch closed
(PosSwClose%) and maximum switch differential
(MaxSwDiff) parameters respectively .
CalibrateOAD= parameter is then be set back to No and
normal unit operation resumes .
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