Hydroid – Series User Manual
30 04/19
SYSTEM OPERATION
General Operation
The unit has 2 modes of operation, a standby mode and an operating mode. In the standby
mode, the unit is effectively off. All outputs are turned off and the display shows OFF. In the
operating mode, the unit operates automatically. All inputs are monitored, and the outputs are
controlled accordingly. Pressing the power key will toggle the unit from standby to operate or
from operate to standby. If power is removed from the unit, when power is reapplied, the unit
will restart in the mode it was in when power was removed.
Display and Status Indicators
The display is a 3-digit display. System operating status, the TDS reading and the TDS setpoint
are shown on this display. A red/green LED indicates the system status in conjunction with the
display. Refer to Table 1 for the description of the operation of the display and LED.
Table 1
RO Start Delay (---)
When the controller is placed in the operating mode or restarts from a shutdown condition, the
inlet valve will open, and a 5 second time delay will start. During the delay, - - - will show on
the water quality display. After this delay, the RO pump will start. The water quality display will
now show the current water quality. The status lamp will show steady green.
Pressure Fault (PF)
If the pressure fault input is active for 2 seconds, a pressure fault condition will occur. This will
cause the controller to shut down. “PF” will show on the water quality display and the status
lamp will flash red. To clear the pressure fault, press the power key twice.
Pressure Fault (PF) Retry
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