Daikin MICROTECH 4 Operation Manual page 127

UNIT MAINTENANCE AND SERvICE
Alarm Number Alarm
Display
Name
56 OADStuck:
Warning
58 ERWheel:
Warning
OM 1373-1
Description
A warning alarm indicating the outdoor air dampers are stuck and not modulating will be
generated whenever the damper are stuck open or stuck closed .
The dampers are considered stuck open when either of the following abnormal situations
occurs:
• The damper command value is less than the calibrated damper end switch closed value
continuously for 180 seconds yet the outside air damper end switch input remains open .
• The damper end switch input does not change from closed to open with 30 seconds of
the damper command value dropping (and remaining) below the calibrated damper end
switch open value (less the calibrated maximum switch differential).
The dampers are considered stuck closed when either of the following abnormal situations
occurs:
• The damper command value is greater than the calibrated damper end switch open
value continuously for 180 seconds yet the outside air damper end switch input remains
open .
• The damper end switch input does not change from closed to open with 30 seconds of
the damper command value rising above the calibrated damper end switch closed value
(plus the calibrated minimum switch differential).
The damper stuck warning will also be generated when the damper end switch operation is
unreliable . The ends switches are considered unreliable when the end switch input remains
closed when the damper command value is between the calibrated end switch closed and
open values (plus and minus the calibrated minimum and maximum switch differentials).
The alarm will automatically clear when the conditions causing the alarm are no longer
present .
Some units are equipped with a wheel rotation detection capability . This is present if the
wheel is using an ECM motor. The ERWheel Warning flag is present if the wheel rotation is
not detected . The alarm will automatically clear when the conditions causing the alarm are no
longer present .
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