US Water Systems Defender 223-DFROM Series, Owner'S Manual

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15
Pre - Filtration
The DEFENDER systems do not include pre - filtration. It is VERY important to have pre - filtration before the RO
system to ensure longevity and that damage will not occur to the unit. A water test of the feed water is used to
determine the proper pretreatment equipment. Contact
US Water Systems for help determining what pre -
treatment equipment is required. 1 - 800 - 608 - 8792.
NOTE: THE SYSTEM MUST BE OPERATED ON FILTERED WATER ONLY. 99.9% OF ALL RO APPLICA-
TIONS REQUIRE SOME FORM OF PRETREATMENT. SYSTEM OPERATED USING UNTREATED
WATER WILL HAVE PREMATURE MEMBRANE FAILURES. MEMBRANE FAILURES DUE TO IM-
PROPER PRETREATMENT ARE NOT COVERED UNDER WARRANTY.
Pump
The pump type used on the DEFENDER systems is multi - stage centrifugal carbon steel pumps.
Follow these guidelines to ensure proper operation of the pump:
•
The pump must NEVER be run dry. Operating the pump without sufficient feed water will damage the
pump.
•
ALWAYS feed the pump with filtered water. The pump is susceptible to damage from sediment and debris.
NOTE: THE FEED WATER PRESSURE MUST NOT FALL BELOW 30 PSI WHILE THE SYSTEM IS RUN-
NING. THE SYSTEM WILL SHUTDOWN FOR A LOW PRESSURE FAULT IF A PRESSURE >30 PSI
CANNOT BE MAINTAINED. DO NOT ATTEMPT TO ADJUST THE PRESSURE SWITCH. THE
PROPER FIX FOR THIS PROBLEM IS TO INCREASE THE FEED PRESSURE WITH A BOOSTER
SYSTEM.
Membranes
The DEFENDER reverse osmosis systems come pre - loaded with Thin Film Composite membranes, unless oth-
erwise specified. General membrane element performance characteristics are listed on the next page.