Daikin DPS Installation And Maintenance Manual

Also see for DPS: Installation and maintenance manual Installation and maintenance manual Installation manual Installation and maintenance manual

Contents

Daikin DPS Installation And Maintenance Manual Manual pdf 96 page image

Unoccupied OperationDuring unoccupied operation the unit operates normally exceptthat Min OA Pos is set to zero so that the damper is closed tothe outdoor airUnoccupied DehumidificationDehumidification may be initiated in the unoccupied mode onlyif Dehumidification Control is set to Always instead of Occupiedon the keypad When this is the case and the humidity goeshigh the unit transitions in the normal manner through Startup and Recirc to Fan Only and then into the DehumidificationMode In this case, the UnoccSrc= parameter indicates “UnoccDehum”Unoccupied Cooling (Night Setup)Unoccupied operation is initiated if the space sensor is reliable,the space temperature is greater than the Unoccupied CoolingSet Point, and the Unoccupied Cooling Set Point is set lowerthan its maximum setting In this case, the unoccupied sourceindicates “UnoccClg”Unoccupied Heating (Night Setback)Unoccupied operation is initiated if the space sensor is reliable,the space temperature is less than the Unoccupied HeatingSet Point, and the Unoccupied Heating Set Point is set higherthan its minimum setting In this case, the Unoccupied Sourceindicates “UnoccHtg”Internal Optimal StartUnoccupied operation is enabled due to an internal optimalstart schedule being activated In this case, the UnoocupiedSource indicates “IntOptStrt”Network Optimal StartUnoccupied operation is enabled due to a network optimal startschedule being activated In this case, the Unoccupied Sourceindicates “NetOpStrt”NoneThe Unoccupied Source is set to “None” when Unoccupiedoperation is inactiveSchedulingThe Air Handling unit can be scheduled for operation by usingthe following three methods:• Unit internal time scheduling functions• External time clock function• Network time scheduling functionProvided the unit is not locally or remotely disabled, the unitoperates when any of these scheduling functions is calling foroccupied operation Conversely, the unit enters the unoccupiedmode when all of these scheduling functions are calling forunoccupied operation Therefore, any unused schedulingfunctions should be set for continuous unoccupied operationThe next four sections: “Setting Controller Date and Time,”“Internal Daily Scheduling,” “Holiday Scheduling,” and “OneEvent Scheduling” describe functions related to the internalunit scheduling functions These are followed by a sectiondescribing the optimal start function which can be use withinternal scheduling and network scheduling This is followedby two sections that describe the external time scheduling andnetwork time scheduling functionsSetting Controller Date and TimeThe controller uses the date and time to execute its internalscheduling functions The current time and date will not be lostif the unit is turned off for up to forty-eight hours The clock anddate are settable from the keypad The time of day can be setby entering the hour (00-23), minute (00-59), and second (00-59) into three fields of the Current Time. Note that MicroTechIII uses “military” time The current date can be set by enteringthe date (00-31), month (01- 12) and year (1999-2155) into thethree fields of the Current Date.Internal Daily ScheduleAn internal Daily Schedule provides one start time and onestop time for each of the seven days of the week and forholidays When the Occ Mode= parameter is set to “Auto/Net”,and the unit is not disabled for other reasons, it starts andstops according to the controller internal scheduleHoliday SchedulingThe operator may select the days when start and stop timesfor holidays are used by selecting a start date and an enddate for up to ten periods during the year by using the holidayscheduling feature Whenever a holiday period occurs, thecontroller uses the Holiday Schedule start and stop time forthe period For example, assume that Christmas Eve occurson a Thursday The building is shut down on both ChristmasEve and Christmas Day, but operates normally on theweekend This holiday period would be scheduled by settingthe Holiday Schedule to the default “no schedule” values“HH:MM- HH:MM” and setting the Holiday Period to “12/24/08- 12/25/08 ”One Event SchedulingA One-Event Schedule is provided so that one operating periodcan be scheduled without affecting the regular internal scheduleA start date/time and an end date/time can be setThe unit can be scheduled to operate during a specified periodby using this feature. During the specified period defined bythe One Event Beginning Date/Time and One Event EndingDate/Time parameters the unit starts up and runs continuouslyregardless of any other time scheduling functions For example,assume that a space served by the unit is occupied for a specialevent on March 12, 2008 from 5:00 p m to 10:00 p m when thenormal time scheduling has the unit shut off after 4:00 p m onthat date This event can be accounted for by setting the OneEvent Beginning Date/Time to “3/12/08 @ 17:00:00” and theOne Event Ending Date/Time to “3/12/08 @ 22:00:00 ”OM 1141-3 • MICROTECH UNIT CONTROLLER 96 wwwoperator ’s guIde