Daikin MicroTech III DPS Installation And Maintenance Manual

Contents

Daikin MicroTech III DPS Installation And Maintenance Manual Manual pdf 57 page image

Operator’s Guidewww DaikinApplied com57 OM 1263 • MICROTECH UNIT CONTROLLERDetermining Cooling StatusClg Status is a status item which indicates whether or notmechanical cooling is currently allowed If cooling is disabled,the reason is indicatedThe following are descriptions of cooling status statesEnabledMechanical cooling is enabled if all the following are true:• Control mode is not set via the keypad to fan only or heatonly• Control mode is set via the keypad to auto and notdisabled via a third-party signal• The outdoor air temperature (OAT) is high enough foroperation• Compressor operation is not disabled by an alarmconditionNoneCooling capability is not providedOff AmbientThe outdoor air temperature (OAT) is too low for operationThe OAT becomes too low for operation when it drops belowthe OAT cooling lockout setting OAT becomes high enough foroperation when it rises above the OAT cooling lockout settingby more than 2°F (adjustable - OAT Diff).Off AlarmCompressor operation is disabled by an alarm conditionOff NetworkControl mode is set via the keypad to auto and cooling isdisabled via a network commandOff ManualControl mode is set to Fan Only or Heat Only via the keypaddisplayDetermining Heat StatusHtg Status is a status item which indicates whether or not theprimary source of heating in the unit is currently allowed Onheat pump units this is the compressor heatingThe following are descriptions of the heating status states:EnabledIn the heat pump, compressor heating is enabled if all of thefollowing are true:• Control Mode is not set via the keypad to fan only or coolonly• Control Mode is set via the keypad to auto and heating isnot disabled via a network command• The outdoor air temperature (OAT) is warm enough(above 0°F default) and cool enough (below 55°F default)for compressor heating operationNoneUnit is not a heat pump and heating capability is not providedOff AmbientIn a heat pump, the OAT is too high or too low for compressorheating operation OAT becomes too high for compressor heatoperation when it rises above the high OAT heating lock outset point The OAT becomes low enough for compressor heatoperation when it drops below the high OAT heating lock outset point by more than the heating lockout differential. The TheOAT becomes too low for compressor heat operation when itfalls below the low OAT heating lock out set point The OATbecomes high enough for compressor heat operation whenit rises above the low OAT heating lock out set point by morethan the heating lockout differential.Off NetworkControl Mode is set via the keypad to auto and heating isdisabled via a network commandOff ManualControl Mode is set via the keypad to fan only or cool only