MAINTENANCE
Milli-Q Synthesis/Synthesis A10 70
6-6 HOW TO CLEAN THE SCREEN FILTER
The Screen Filter is located in the Assembly of Blue Fittings that came in the Accessories Bag (from the Shipping
Box).
The purpose of the Screen Filter is to prevent a large particle or other debris from entering the Inlet Solenoid Valve of
the Milli-Q System. This will allow the Inlet Solenoid Valve to open and close correctly. If the Screen Filter becomes
blocked with debris (’clogged’), then feedwater will not flow freely to the Milli-Q.
It is recommended to clean the Screen Filter twice a year or whenever it may have become clogged. An example
of this would be if there were a large amount of debris introduced into the feedwater supply (i.e. plumbing work
done on the feedwater pipe).
Follow the instructions below for cleaning the Screen Filter
.
Make sure the Milli-Q is in PRE OPERATE Mode.
Locate the Shut Off Valve on the feedwater supply. Turn off the valve.
Bring the POU Dispenser Trigger forward for about 5 seconds. The Milli-Q will go into PRODUCT Mode. This
will depressurise the Feedwater Tubing. Bring the POU Dispenser Trigger back.
Place the Milli-Q into STANDBY Mode.
Locate the Screen Filter. This will be located where the feedwater 8 mm OD tubing originates (i.e. where the 8
mm tubing meets a pressurised pipe).
Unscrew the collar that holds the Feedwater Tubing to the barbed end of the fittings. Pull the tubing off of the
fitting.
Unscrew the Screen Filter from the Feedwater Pipe (Loop).
Go to a sink and flush tap water backwards through the Screen Filter. The water would flow through the
barbed end first. Any trapped debris on the Screen Filter would be flushed out.
Stop flushing the Screen Filter. View inside to make sure it is now clear of debris.
Locate the Roll of Teflon Tape from the Milli-Q Accessories Bag( from the Shipping Box).
Apply 3-4 turns of new Teflon Tape to the threads of the Feedwater Pipe. Apply the tape in a clockwise
direction.
Screw the Screen Filter back onto the Feedwater Supply Pipe.
Attach the Feedwater Tubing back onto the Barbed Fitting. Make sure the tubing is securely fastened.
Open the Feedwater Supply Valve.
Place the Milli-Q into PRODUCT Mode to dispense some water from it. See Section 5-1 for more information
on how to do this. During this time, check the setting of the Feedwater Pressure Regulator. It should be set to a
value between 0.1 bar and 0.3 bar.
Leave the Milli-Q in PRE OPERATE Mode when you are done dispensing water.
You have finished cleaning the Screen Filter.
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