SECTION 2-13
EQUIPMENT DESCRIPTION
FLOWMAX RO MANUAL REV: B 05/1999
USFilter
United States Filter Corporation
When the HOA switch is turned to HAND position, the RO unit will run and remain running until the
switch is turned back to the OFF or any of the following alarm conditions; low feed pressure, high
feedwater temperature or high pump discharge pressure. This operating mode completely bypasses the
shutdown signals from the pretreatment system, storage tank level sensing device or low product quality
alarm.. This mode is typically used for initial start-up rinse or after a cleaning cycle to rinse up the
membrane elements.
Off
Turning the HOA switch to the OFF position at any time will stop the RO pump and the unit will remain
off until the switch is placed into the HAND or AUTO position.
Auto
When the HOA switch is turned to AUTO position, the RO unit will run and remain running until a
shutdown signal is received for the pretreatment system or storage tank level sensing device. The unit
will also shutdown based on any of the following alarm conditions; low feed pressure, high feedwater
temperature, high pump discharge pressure, or low product quality. This is the position to be used for
normal operation of the RO unit.
Storage Tank Full Light
There is a relay in the control panel that must be tied into storage tank level device. This is typically a
pressure switch with a deadband or a set of level switches. The level sensing devices are used to start
the RO when the tank level drops to half full, and stop the RO when the tank is full. It is important to
maintain a deadband to prevent frequent cycling on and off of the RO unit. The level sensing device
must have a set of normally closed dry contacts to connect to the RO control panel. The RO can not be
run in the AUTO mode unless the level device is wired in. . If the RO is run in the HAND mode, the
storage tank level device shutdown interlock will be ignored. This could cause the tank to overflow and
possibly damage surrounding equipment.
Alarm Reset
After pressing the Alarm Silence pushbutton to silence the alarm, you must determine and correct the
cause of the alarm. After this has been done, you must reset the panel prior to restarting the RO. To do
this, turn the RO HOA switch to OFF, this will reset the panel and the alarm light will go off.. To restart
the RO, turn the HOA switch to HAND or AUTO.
Alarm Lights
The alarm lights will flash off & on during an alarm condition, and they will continue to flash until the
operator acknowledges the alarm. This is done by pushing the Alarm Reset pushbutton switch. After
the alarm has been acknowledged, the light will remain on until the HOA switch is turned to the OFF
position.
Alarm Horn
An alarm horn will sound whenever the unit shuts down based on the following conditions; ; low feed
pressure, low reject flow, high product flow, high feedwater temperature or high pump discharge
pressure. The alarm horn is silenced by pressing the Alarm Silence pushbutton switch. The alarm horn
is controlled by a timer that will shut it off automatically after 5 minutes, in the event it has not been
acknowledged. It will come back on after five minutes and sound for 30 seconds, then go off again.
This cycle will continue until the Alarm Silence pushbutton switch has been pushed.
