Millenium MRO-35 Operation Manual

Reverse osmosis drinking water system

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Millennium
Reverse Osmosis Drinking Water System
Model MRO-35
INSTALLATION, OPERATION & SERVICE MANUAL
Tested and Certified by NSF International against
NSF/ANSI Standard 58 for the reduction of the
claims specified on the Performance Data Sheet.

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Do you have a question about the MRO-35 and is the answer not in the manual?

Questions and answers

Josh
April 18, 2025

The system randomly beeps at all hours of the day. What does this mean?

1 comments:
Mr. Anderson
May 9, 2025

The random beeping of the Millenium MRO-35 system at all hours likely indicates that the Water Quality Monitor is detecting product water quality below the acceptable level, such as when the percent rejection falls below 75%. This may happen if the system is not being used for an extended period, or if the filters or membrane are fouled or exhausted and need to be replaced.

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Summary of Contents for Millenium MRO-35

  • Page 1 Millennium Reverse Osmosis Drinking Water System Model MRO-35 INSTALLATION, OPERATION & SERVICE MANUAL Tested and Certified by NSF International against NSF/ANSI Standard 58 for the reduction of the claims specified on the Performance Data Sheet.
  • Page 2: Table Of Contents

    TABLE OF CONTENTS Page SECTION I. INTRODUCTION ...................3 SECTION II. SPECIFICATIONS ................4 SECTION III. PREPARATION ..................5 A. Major System Components .............5 B. Tools Recommended for Installation ..........7 C. Site Selection For Major System Components .......7 SECTION IV. INSTALLATION STEPS ................8 A.
  • Page 3: Section I

    SECTION I. INTRODUCTION very good adsorptive sites for substances that contribute to tastes and odors. Your new Reverse Osmosis (R.O.) Drinking Water System uses a combination of filtration technologies IN–LINE ACTIVATED CARBON POST FILTER– to reduce unwanted contaminants in a water supply. The In–Line Activated Carbon Post Filter is The following steps combine to give you the best in located after the Holding Tank and has been...
  • Page 4: Specifications

    SECTION II. SPECIFICATIONS TABLE A – QUALIFIED SYSTEM PERFORMANCE Because the performance of an R.O. Membrane is highly dependent upon pressure, temperature and TDS, the following should be used for comparison purposes only. U.S. Metric Membrane Production 41-53 gpd 155–201 lpd Membrane TDS Reduction 96% minimum 96% minimum...
  • Page 5: Preparation

    A Sediment/Carbon Prefilter, shrink wrapped. local codes, check with the local plumbing authority. • An Activated Carbon Post Filter, shrink wrapped. TYPICAL MRO-35 UNDER SINk INSTALLATION DIAGRAM Dispensing Faucet with air gap water qualitY mOnitOr Faucet Base (OptiOnal) water qualitY mOnitOr caBle (OptiOnal)
  • Page 6 OPTIONAL MRO-35 BASEMENT INSTALLATION DIAGRAM Dispensing Faucet water qualitY mOnitOr Faucet Base (OptiOnal) nOte: FOr reFrigeratOr water Dispenser Or prODuct ice maKer hOOKup, tee (3/8” Blue) intO 3/8" Blue tuBing tO Dispensing Faucet. water qualitY mOnitOr caBle (OptiOnal) hOlDing tanK shutOFF ValVe 25 Ft.
  • Page 7: Tools Recommended For Installation

    B.  Tools Recommended for Installation  1.  Dispensing Faucet–The faucet should be placed near the sink where drinking water The following tools will cover most of the is normally obtained. Convenience of use installation sites encountered: (filling of water pitchers and glasses), and an " variable speed electric drill. open area beneath the faucet under the sink for attaching product and drain tubing are 2.
  • Page 8: Installation Steps

    SECTION IV. INSTALLATION STEPS 2c. Drilling a counter top: All plumbing should be done in accordance with NOTE: The counter top must be less than state and local plumbing codes. 1¼" thick. Treat ceramic tile as porcelain until NOTE: Some codes may require installation by a the tile is penetrated, then use the carbide tipped metal cutter.
  • Page 9 5. Place the Toggles of the Monitor Housing Assembly through the mounting hole on the sink or counter top. Drop the handle of the Wrench through the Monitor 7. Determine which direction the handle should Housing opening. This will separate and orient the face (right or left).
  • Page 10: Feed Water Saddle Valve Installation

    FEED WATER SADDLE VALVE •When you feel the Valve Handle firmly seated in the clockwise direction, the copper tube is pierced and the valve is Cold Water closed. Line 2b. To install on (hard) steel or brass tubing Saddle Reversible supply line.
  • Page 11: Manifold Assembly Installation

    2. Use a battery powered or properly grounded Reference the special supplement sheet in drill. Using the Clamp port as a drill guide, the carton for proper connection of all tubing drill a " hole through the wall of the drain and removal of plugs.
  • Page 12: Position The Drinking Water Holding Tank And Make The Final Hose Connections

    E.  Position the Drinking Water Holding Tank  of bleach. Insert a Housing O–ring, engage and Make the Final Hose Connections.  and firmly tighten the Housings hand tight only. 1. Check the tank precharge pressure. Make sure it is between 5 to 7 psig. If not, use a •Slowly open the Feed Water Saddle Valve bicycle hand pump or other pump to bring the (turning counter clockwise).
  • Page 13: Operation And Maintenance

    B.  Changing Filters  When the Faucet is first opened, expect air and carbon fines (very fine black powder) THIS R.O. SYSTEM CONTAINS FILTERS from the In–Line and Activated Carbon Post WHICH MUST BE REPLACED AT REGULAR Filters to be rinsed out. This is normal for INTERVALS TO MAINTAIN PROPER the first tank of water or after the Activated PERFORMANCE.
  • Page 14: Changing The In-Line Activated Carbon Post Filter

    IN–LINE ACTIVATED CARBON •Add one capful of bleach to the Activated Carbon Post Filter Housing. Carefully fill POST FILTER ASSEMBLY the Housing with tap water and temporarily install the Housing without the Activated Dispensin g Carbon Post Filter. Fa u ce t •The Dispensing Faucet should be open, slowly open the Feed Water Saddle Valve.
  • Page 15 NOTES:...
  • Page 16: Trouble Shooting Guide

    SECTION VI. TROUBLE SHOOTING GUIDE Problem Possible Cause Solution Low quantity of Product Water  Feed Water Saddle Valve is plugged or Open Valve or unclog. from Holding Tank closed. Clogged Sediment Module or Activated Replace Modules. Carbon Module. Low water pressure. Feed Water pressure must be above 40 psig.
  • Page 17 Problem Possible Cause Solution High Total Dissolved Solids (TDS)  The Product Water and Drain Water Correct plumbing. in the Product Water lines are reversed. (continued) No drain flow, Drain Restrictor is Clear or replace Drain Restrictor. clogged. No drain flow, the drain orifice in Clear or replace Dispensing Faucet. the Dispensing Faucet is plugged.
  • Page 18: Exploded View And Parts List

    EXPLODED VIEW & PARTS LIST 21..Nitrate/Nitrite Test Kit 22..Water Quality Test Kit (for systems without the Water Quality Monitor) MADE IN USA...
  • Page 19 DRAWING NO. PART NO. DESCRIPTION 1 ....S2009 ......Self Tapping Screw 2 ....S2005 ......ASO Cap 3 ....S2013 ......ASO Cap O–Ring 4 ....S2011 ......ASO Diaphragm – Large 5 ....S2007 ......ASO Piston 6 ....S2006 ......ASO Piston Ring 7 ....
  • Page 20 R.o. DRInKInG WateR sYsteM FiVe/One Year limiteD warrantY What Does This Warranty Cover? This warranty covers any defects in materials and workmanship of the Millennium R.O. Drinking Water System when installed and operated within recommended parameters, with the exceptions stated below. How Long Does The Coverage Last? Hellenbrand, Inc.

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