OPERATING INSTRUCTIONS
MANOWNROLH
3-2
U.S. FILTER
3.3
INITIAL FLUSHING OF THE SYSTEM
Since the RO membrane is shipped moist with sodium bisulfite preservative solution,
initial flushing of the system is required. Before operating a new system, and also after a
replacement of an RO membrane, perform the following steps:
A.
Place the outlet of the permeate at a convenient drain.
B.
Turn on the input water and the system pump (as outlined in Operating
Instructions, Initial Startup of the Reverse Osmosis System section of this
manual) and let the system run for 4 hours with the reject valve completely open.
Adjust the pump discharge valve so that the membrane feed pressure is
approximately 5.2 bar (75 psi). This will flush residual bisulfite solution and any
particulate impurities from the membranes, housings and plumbing of the
system.
C.
Permeate quality will increase slowly for 1 hour. Monitor the inlet quality vs. the
permeate quality.
NOTE:
The system should have better than 90% rejection within 2 hours as the
membranes equilibrate. If the permeate quality does not improve, refer to the
Troubleshooting section of this manual.
D.
After flushing, turn off the system and reconnect the permeate line. The system is
now ready to be put into a normal operating mode.
3.4
NORMAL OPERATIONS
It is best to operate the RO system continuously to avoid membrane fouling; however,
the automated controls provide periodic flushing of the system. Rather than produce
water at a maximum capacity then shutdown the system, it would be better practice to
balance the product water rate with demand. This is achieved by increasing or
decreasing the membrane feed pressure with the pump discharge throttle valve.
A.
Initiate operation by turning on/off switch to "ON".
B.
After waiting for completion of the flush cycle, which is initiated each time the unit
is put into operation, adjust the reject control valve and/or recirculation flows to
give slightly more reject flow than the minimum indicated on the System
Specifications sheet in the Appendix. This will assure that inorganic salts will be
removed from the reject side of the membranes in concentrations low enough to
avoid fouling.
C.
If product water is set to slightly exceed demand the unit will automatically shut
down when the product water storage tank is full.
D.
Check the conductivity of the inlet and product water to verify the unit is operating
properly.
E.
Enter the operating data on the log sheet (sample in Appendix). Check the unit
at least daily and follow the Maintenance Summary section, logging in the
operating data as prescribed.
