Unoccupied Operation; Scheduling - Daikin MicroTech III Operation Manuals

Unoccupied Operation

During unoccupied operation the unit operates normally except
that Min OA Pos is set to zero so that the damper is closed to
the outdoor air .
Unoccupied Dehumidification
Dehumidification may be initiated in the unoccupied mode only
if Dehumidification Control is set to Always instead of Occupied
on the keypad . When this is the case and the humidity goes
high the unit transitions in the normal manner through Start
up and Recirc to Fan Only and then into the Dehumidification
Mode . In this case, the UnoccSrc= parameter indicates "Unocc
Dehum" .
Unoccupied Cooling (Night Setup)
Unoccupied operation is initiated if the space sensor is reliable,
the space temperature is greater than the Unoccupied Cooling
Setpoint, and the Unoccupied Cooling Setpoint is set lower
than its maximum setting . In this case, the unoccupied source
indicates "UnoccClg" .
Unoccupied Heating (Night Setback)
Unoccupied operation is initiated if the space sensor is reliable,
the space temperature is less than the Unoccupied Heating
Setpoint, and the Unoccupied Heating Setpoint is set higher
than its minimum setting . In this case, the Unoccupied Source
indicates "UnoccHtg"
Internal Optimal Start
Unoccupied operation is enabled due to an internal optimal
start schedule being activated . In this case, the Unoocupied
Source indicates "IntOptStrt" .
Network Optimal Start
Unoccupied operation is enabled due to a network optimal start
schedule being activated . In this case, the Unoccupied Source
indicates "NetOpStrt" .
None
The Unoccupied Source is set to "None" when Unoccupied
operation is inactive .
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Scheduling

The Air Handling unit can be scheduled for operation by using
the following three methods:
• Unit internal time scheduling functions
• External time clock function
• Network time scheduling function
Provided the unit is not locally or remotely disabled, the unit
operates when any of these scheduling functions is calling for
occupied operation . Conversely, the unit enters the unoccupied
mode when all of these scheduling functions are calling for
unoccupied operation . Therefore, any unused scheduling
functions should be set for continuous unoccupied operation .
The next four sections: "Setting Controller Date and Time,"
"Internal Daily Scheduling," "Holiday Scheduling," and "One
Event Scheduling" describe functions related to the internal
unit scheduling functions . These are followed by a section
describing the optimal start function which can be use with
internal scheduling and network scheduling . This is followed
by two sections that describe the external time scheduling and
network time scheduling functions .
Setting Controller Date and Time
The controller uses the date and time to execute its internal
scheduling functions . The current time and date will not be lost
if the unit is turned off for up to forty-eight hours . The clock and
date are settable from the keypad . The time of day can be set
by entering the hour (00-23), minute (00-59), and second (00-
59) into three fields of the Current Time. Note that MicroTech
III uses "military" time . The current date can be set by entering
the date (00-31), month (01- 12) and year (1999-2155) into the
three fields of the Current Date.
Internal Daily Schedule
An internal Daily Schedule provides one start time and one
stop time for each of the seven days of the week and for
holidays . When the Occ Mode= parameter is set to "Auto/Net",
and the unit is not disabled for other reasons, it starts and
stops according to the controller internal schedule .
Holiday Scheduling
The operator may select the days when start and stop times
for holidays are used by selecting a start date and an end
date for up to ten periods during the year by using the holiday
scheduling feature . Whenever a holiday period occurs, the
controller uses the Holiday Schedule start and stop time for
the period . For example, assume that Christmas Eve occurs
on a Thursday . The building is shut down on both Christmas
Eve and Christmas Day, but operates normally on the
weekend . This holiday period would be scheduled by setting
the Holiday Schedule to the default "no schedule" values
"HH:MM- HH:MM" and setting the Holiday Period to "12/24/08
- 12/25/08 ."
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