Daikin WGZ030DW Operating And Maintenance Manual page 38

Evaporator Water Pump State Control (Evap State)
The state-transition diagram shown below controls operation of the evaporator pump.
Unit State = Off AND
No Evap Water Freeze Alarm
Pump Selection
The pump output used will be determined by the Evap Pump Control set point. The setting allows the
following configurations:
#1 only – Pump 1 will always be used.
#2 only – Pump 2 will always be used.
Auto – The primary pump is the one with the least run hours, the other is used as a backup.
#1 Primary – Pump 1 is used normally, with pump 2 as a backup.
#2 Primary – Pump 2 is used normally, with pump 1 as a backup.
38
Unit State Diagram
Power On
T3
Pumpdown
Evaporator Pump State Diagram
Unit State = Off AND
No Evap Water Freeze Alarm
Run
[Evap Pump State = Start
AND Flow Switch Closed]
for time > Evap Recirc Tmr
WGZ030D through WGZ200D
Off
T1
T4
Auto
T2
Off
Unit State=Auto OR
Evap Water Freeze Alarm
Start
OMM 1130-2