Daikin WGZ030DW Operating And Maintenance Manual page 67

Bypass valve position is > the Stage Up @ setpoint (only if Valve/VFD Control setpoint = Valve Stage)
Additional stages can turn on (up to the number specified by the Tower Stages setpoint) when above
conditions are met for the next stage plus the following condition:
VFD Speed is > the Stage Up @ setpoint (only if Valve/VFD Control setpoint = VFD Stage OR Valve
SP/VFD Stage)
Down staging shall occur when the following conditions are met:
The stage down timer completes
The ECWT is < Stage #X ON (Temp) setpoint – Stage Differential (Temp) setpoint point
Bypass valve position is < the Stage Down @ setpoint (only if Valve/VFD Control setpoint = Valve
Stage)
VFD Speed is < the Stage Down @ setpoint (only if Valve/VFD Control setpoint = VFD Stage OR Valve
SP/VFD Stage)
Each stage up or stage down event shall restart both the stage up and stage down timers. Only one fan
output shall be switched at a time (except that all outputs switch OFF when the condenser pump state
equals OFF).
Water-cooled On
SET TOWER SPs (1)
Tower Control= None
Tower Stages = X
StageUP/DN=XXX/XXX%
When Tower Control is None the control of condenser water temperature is not by the MicroTech II
controller and assumed to be furnished elsewhere.
Tower Stages is the number of tower fans to be staged by the controller, choices are 0, 1, or 2. "0"
indicates control will be by a bypass valve or variable speed pump controlled by the MicroTech II
controller.
StageUP/DN imposes a time delay between fan stages when turning on or turning off.
Water-cooled On
SET TOWER SPs (2)
Stage ON (Temp)°F
#1 #2
XXX XXX
Stage ON Temp is the entering condenser water temperature (ECWT) that will turn on tower fan #1 and
#2. Default settings are 70°F and 75°F. Cold condenser water will improve unit efficiency but too cold
can cause erratic operation. Settings below 60°F are not recommended.
Water-cooled On
SET TOWER SPs (3)
StageDiff = XX.X°F
Stage Up Tmr=XX min
StageDn Tmr=XX min
StageDiff is the number of degrees below the Stage ON that will turn off the tower fans. For example, if
Stage ON #1 is 70°F and StageDiff is 5°F, tower fan #1 will stage off when the ECWT drops to 65°F and
stage the fan on when the ECWT rises to 70°F. The same is true for fan #2.
Stage Up timer is the number of minutes that must elapse between the condenser pump starting (it starts
with the unit) and fan #1 starting or the time between fan #1 starting and fan #2 starting.
StageDown is the elapsed time between staging down the fan motors.
OMM 1130-2 67