Installation and Service Manual – L Series Reverse Osmosis System
Systems and Components
Membranes
,
Filters
,
Chemicals
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Page 17
System Automation
The system will automatically turn on when the water level in the permeate tank reaches the mid level float, and turn off
when the water meets the high level float.
There are two float switches on this system:
High level float switch: Signals when tank is full and shuts down the unit.
Low level float switch: Signals when the tank is half empty and turns the unit on.
(Optional third switch) Tank empty switch: Signals when the tank is empty to shut off the repressurization
pump (not included with the system).
Example of typical start-up sequence:
1. Water level in tank drops to low level.
2. Solenoid opens to allow feed water into the system.
3. Incoming feed must meet/exceed low pressure setpoint for the pump to turn on. (This will indicate sufficient inlet
water supply to operate the pump without cavitation.)
4. Pump will start after delay (typically 5-10 seconds).
5. Permeate and concentrate flows are determined by manual control of concentrate valve.
6. System will continue to run until the water level in the tank reaches high level.
7. Once the water reaches high level, pump will stop and a flush cycle will begin. The solenoid will close once the flush
is complete.
System Shut-Down
1. Press the Power Button. Allow sufficient time for the system to go through the flush cycle before proceeding.
2. Turn off the main power disconnect. This removes all power from both the power and control enclosures.
3. If the RO System is to be shut down for more than a week, a membrane preservative should be used. Refer to the
instructions for preserving the system.
4. When the system is restarted after extended shutdown, both permeate and concentrate should be diverted to the
drain for at least 30 minutes.
System
Monitoring
and
Record
Keeping
The system should be monitored and all pertinent data recorded on a daily basis. Data is needed to determine the
operating efficiency and for performing system maintenance. The latter includes cleaning of the membranes, adjusting
the operating conditions, replacement of the membranes, and antiscalant use. Use the system data logging form the
following page.
*Membrane warranty claims cannot be processed without adequate operating data and history of the RO System.
