Rheem RHS42 Demand Controlled Water Softener

Product Overview

This manual provides instructions on how to install, operate, and maintain your Rheem Demand Controlled Water Softener, Model RHS42. It includes specifications, installation requirements, programming details, controller features, routine maintenance, troubleshooting, parts lists, and warranty information.

For product and warranty registration, visit www.rheemwatertreatment.com. For questions, call toll-free at 1-800-754-7027. Please have your model and serial number ready when calling.

This system is tested and certified by NSF International against NSF/ANSI Standard 44 for hardness reduction, efficiency, and reduction of barium and radium 226/228, and certified to NSF/ANSI Standard 372.

Dimensions

FIG. 1: Water Softener Dimensions

Top View: 20-1/2 inches wide, 15-1/4 inches deep. Inlet (IN) and Outlet (OUT) ports are shown on the top.

Side View: 48 inches high. Inlet (IN) and Outlet (OUT) ports are located approximately 41-3/4 inches from the bottom.

Specifications & Performance Claims

This model is efficiency rated and features a demand initiated regeneration (D.I.R.) system designed to minimize regenerant brine and water usage. It meets specific performance specifications intended for efficient operation.

The water softener has a rated efficiency of not less than 3,350 grains of total hardness exchange per pound of salt (based on sodium chloride). Laboratory tests, as described in NSF/ANSI Standard 44, confirm its maximum possible efficiency. Operational efficiency may vary based on installation factors.

*Intermittent flow rate does not represent the maximum service flow rate used for determining the softener's rated capacity and efficiency. Continuous operation at flow rates greater than the service flow rate may affect capacity and efficiency performance.

**Capacity to reduce clear water iron is substantiated by laboratory test data. State of Wisconsin requires additional treatment if water supply contains clear water iron exceeding 5 ppm.

This system conforms to NSF/ANSI Standard 44 for the specific performance claims as verified and substantiated by test data.

Variable Salt Dose: The salt dose is selected by the electronic controls at regeneration time based on the amount needed.

Before You Start

• The water softener requires a minimum water flow of 3 gallons per minute at the inlet. Maximum allowable inlet water pressure is 125 psi. If daytime pressure is over 80 psi, nighttime pressure may exceed the maximum. Use a pressure reducing valve if necessary (Adding a pressure reducing valve may reduce the flow). If your home is equipped with a back flow preventer, an expansion tank must be installed in accordance with local codes and laws.
• The water softener works on 24V DC electrical power, supplied by a direct plug-in power supply (included). Be sure to use the included power supply and plug it into a nominal 120V, 60 Hz household outlet that is in a dry location only, grounded and properly protected by an overcurrent device such as a circuit breaker or fuse.
• Do not use this system to treat water that is microbiologically unsafe or of unknown quality without adequate disinfection upstream or downstream of the system.

European Directive 2002/96/EC requires all electrical and electronic equipment to be disposed of according to Waste Electrical and Electronic Equipment (WEEE) requirements. This directive or similar laws are in place nationally and can vary from region to region. Please refer to your state and local laws for proper disposal of this equipment.

In the state of Massachusetts: The Commonwealth of Massachusetts plumbing code 248-CMR shall be adhered to. A licensed plumber shall be used for this installation.

In the state of California: You must turn the Salt Efficiency Feature setting to ON. This may initiate more frequent recharges. However, it will operate at 4,000 grains per pound of salt or higher. To turn on the Salt Efficiency Feature, follow the instructions in the “Salt Efficiency" section of this manual.

Do not return the water softener to store.

Inspect Shipment

The parts required to assemble and install the water softener are included with the unit. Thoroughly check the water softener for possible shipping damage and parts loss. Also inspect and note any damage to the shipping carton.

Remove and discard (or recycle) all packing materials. To avoid loss of small parts, we suggest you keep the small parts in the parts bag until you are ready to use them.

Packing List

FIG. 2: Packing List Components

• Bypass Valve
• Drain Hose
• O-rings
• Installation Adaptors
• Clips (2 are shipped installed on the softener's valve)
• Hose Clamps
• Adaptor Elbow
• Grommet

Water Conditioning Information

Iron

Iron in water can cause stains on clothing and plumbing fixtures. It can negatively affect the taste of food, drinking water, and other beverages. Iron in water is measured in parts per million (ppm). The total* ppm of iron, and type or types*, is determined by chemical analysis. Four different types of iron in water are:

• Ferrous (clear water) iron
• Ferric (red water) iron
• Bacterial and organically bound iron
• Colloidal and inorganically bound iron (ferrous or ferric)

Ferrous (clear water) iron is soluble and dissolves in water. This water softener will reduce moderate amounts of this type of iron (see specifications).** Ferrous (clear water) iron is usually detected by taking a sample of water in a clear bottle or glass. Immediately after taking, the sample is clear. As the water sample stands, it gradually clouds and turns slightly yellow or brown as air oxidizes the iron. This usually occurs in 15 to 30 minutes.

When using the softener to reduce Ferrous (clear water) iron, add 5 grains to the hardness setting for every 1 ppm of Ferrous (clear water) iron. See "Set Water Hardness Number" section.

Ferric (red water), and bacterial and organically bound irons are insoluble. This water softener will not remove ferric or bacterial iron. This iron is visible immediately when drawn from a faucet because it has oxidized before reaching the home. It appears as small cloudy yellow, orange, or reddish suspended particles. After the water stands for a period of time, the particles settle to the bottom of the container. Generally these irons are removed from water by filtration. Chlorination is also recommended for bacterial iron.

Colloidal and inorganically bound iron is of ferric or ferrous form that will not filter or exchange out of water. This water softener will not remove colloidal iron. In some instances, treatment may improve colloidal iron water. Colloidal iron water usually has a yellow appearance when drawn. After standing for several hours, the color persists and the iron does not settle, but remains suspended in the water.

Sediment

Sediment is fine, foreign material particles suspended in water. This water softener will not remove sediment. This material is most often clay or silt. Extreme amounts of sediment may give the water a cloudy appearance. A sediment filter installed upstream of the water softener normally corrects this situation.

* Water may contain one or more of the four types of iron and any combination of these. Total iron is the sum of the contents.

** Capacity to reduce clear water iron is substantiated by laboratory test data.

Installation Requirements

Location Requirements

Consider all of the following when selecting an installation location for the water softener.

• Do not locate the water softener where freezing temperatures occur. Do not attempt to treat water over 120°F. Freezing temperatures or hot water damage voids the warranty.
• To condition all water in the home, install the water softener close to the water supply inlet, and upstream of all other plumbing connections, except outside water pipes. Outside faucets should remain on hard water to avoid wasting conditioned water and salt.
• A nearby drain is needed to carry away regeneration discharge (drain) water. Use a floor drain, laundry tub, sump, standpipe, or other options (check your local codes). See "Air Gap Requirements" and "Valve Drain Requirements" sections.
• The water softener works on 24V DC electrical power, supplied by a direct plug-in power supply (included). Provide nearby a 120V, 60Hz electrical outlet in accordance with NEC and local codes.
• Always install the water softener between the water inlet and water heater. Any other installed water conditioning equipment should be installed between the water inlet and water softener (See Figure 4 below).
• Avoid installing in direct sunlight. Excessive sun heat may cause distortion or other damage to non-metallic parts.
• Install on a flat, stable surface that evenly supports the weight of the water softener.

Plumbing Codes

All plumbing must be completed in accordance with national, state and local plumbing codes.

In the state of Massachusetts: The Commonwealth of Massachusetts plumbing code 248-CMR shall be adhered to. A licensed plumber shall be used for this installation.

Air Gap Requirements

A drain is needed for the water discharged from the valve during the softener's regeneration cycle (See Figure 3). A floor drain, close to the water softener, is preferred. A laundry tub, standpipe, etc. are other drain options. Secure valve drain hose in place.

Leave an air gap of 1-1/2" between the end of the hose and the drain. This gap is needed to prevent backflow of sewer water into the water softener. Do not put the end of the drain hose into the drain.

FIG. 3: Air Gap Requirements for Drain Connections (Floor Drain, Standpipe, Laundry Tub)

The Proper Order to Install Water Treatment Equipment

FIG. 4: Typical Water Treatment Equipment Installation Order

The diagram shows the typical flow for water treatment equipment:

• City Water Supply connects to an Optional Sediment Filter, then a Pressure Tank, then a Water Heater, and finally the Water Softener.
• Treated water flows from the Water Softener to the Cold Water supply for the House.
• Untreated water is available at Outside Faucets.
• Alternatively, a Well Water Supply connects to a Well Pump, which then feeds into the system (typically before the pressure tank or water heater).

Installation Instructions

Valve Drain Requirements

Using the flexible drain hose (included), measure and cut to the length needed. Flexible drain hose is not allowed in all localities (check your plumbing codes). If local codes do not allow use of a flexible drain hose, a rigid valve drain run must be used. Purchase a compression fitting (1/4 NPT x 1/2 in. minimum tube) and 1/2" tubing from your local hardware store. Plumb a rigid drain as needed (See Figure 6).

NOTE: Avoid drain hose runs longer than 30 feet. Avoid elevating the hose more than 8 feet above the floor. Make the valve drain line as short and direct as possible.

FIG. 5: Drain Hose Connection Detail

FIG. 6: Rigid Drain Line Setup Detail

Inlet / Outlet Plumbing Options

Always install either a single bypass valve (provided), as shown in Figure 7, or, if desired, parts for a 3 valve bypass system (not included) can be purchased and assembled, as shown in Figure 8. Bypass valves allow you to turn off water to the softener for maintenance if needed, but still have water in house pipes.

Use:

• Copper pipe
• Threaded pipe
• PEX (Crosslinked Polyethylene) pipe
• CPVC plastic pipe
• Other pipe approved for use with potable water

IMPORTANT: Do not solder with plumbing attached to installation adaptors and single bypass valve. Soldering heat will damage the adaptors and valve.

FIG. 7: Single Bypass Valve Operation (Service/Bypass)

FIG. 8: 3 Valve Bypass System Configuration

Typical Installation

FIG. 9: Typical Water Softener Installation Diagram

The diagram illustrates the typical plumbing connections for the water softener. It shows the main water pipe splitting to feed both the water softener inlet and a bypass line. The soft water outlet from the softener supplies the house. A drain hose connects to the valve for regeneration discharge, and an overflow hose is present for the salt tank. The unit is powered by a 24V DC plug-in power supply.

Turn Off Water Supply

1. Close the main water supply valve, located near the well pump or water meter.
2. Shut off the electric or fuel supply to the water heater.
3. Open all faucets to drain all water from house pipes. NOTE: Be sure not to drain water from the water heater, as damage to the water heater elements could result.

Assembly

1. Rheem® models are factory assembled. During installation, unsnap and remove the top cover, together with the salt lid, to expose the softener valve assembly. Set them aside to prevent damage. Check the brinewell to be sure it is secured and vertical (See Figure 11).
2. Install the brine tank overflow grommet and elbow into the 13/16" diameter hole in the back of the salt storage tank wall.

FIG. 11: Brine Tank Components Diagram

Move the Unit Into Place

1. Move the water softener into the desired location. Set it on a solid, level surface.
2. IMPORTANT: Do not place shims directly under the salt storage tank to level the softener. The weight of the tank, when full of water and salt, may cause the tank to fracture at the shim.

Complete Inlet and Outlet Plumbing

Measure, cut, and loosely assemble pipe and fittings from the main water pipe to the inlet and outlet ports of the water softener valve. Be sure to keep fittings fully together, and pipes squared and straight.

Be sure hard water supply pipe goes to the water softener valve inlet side.

NOTE: Inlet and outlet are marked on the water softener valve. Trace the water flow direction to be sure hard water is to inlet.

IMPORTANT: Be sure to fit, align and support all plumbing to prevent putting stress on the water softener valve inlet and outlet. Undue stress from misaligned or unsupported plumbing may cause damage to the valve.

Complete the inlet and outlet plumbing for the type of pipes you will be using.

FIG. 10: Turbine Assembly Detail

FIG. 12: Single Bypass Valve Clip Attachment

FIG. 13: Correct Assembly of Bypass Valve Clips

NOTE: Be sure all 3 tabs of the clip go through the matching holes on the water softener valve inlet or outlet, and fully into the channel on the single bypass valve. Make sure that the tabs are fully seated.

Cold Water Pipe Grounding

CAUTION: The house cold water pipe (metal only) is often used as a ground for the house electrical system. The 3-valve bypass type of installation, shown in Figure 8, will maintain ground continuity. If you use a plastic bypass valve at the unit, continuity is broken. To restore the ground, do the following:

1. Install a #4 copper wire across the removed section of main water pipe, securely clamping it at both ends (See Figure 14) - parts not included.

NOTE: Check local plumbing and electrical codes for proper installation of the ground wire. The installation must conform to them. In Massachusetts, plumbing codes of Massachusetts shall be conformed to. Consult with your licensed plumber.

FIG. 14: Cold Water Pipe Grounding Diagram

Install Valve Drain Hose

NOTE: See valve drain options on pages 6 & 7.

1. Measure, cut to needed length and connect the 3/8" drain line (provided) to the water softener valve drain fitting. Use a hose clamp to hold the hose in place.

IMPORTANT: If codes require a rigid drain line see "Valve Drain requirements" section.

2. Run the drain hose (or a rigid line) to the floor drain. Secure drain hose. This will prevent "whipping" during regenerations. Be sure to provide a 1-1/2" minimum air gap to prevent possible sewer water backup. See "Air Gap Requirements" section.

NOTE: In addition to a floor drain, you can use a laundry tub or standpipe as a drain point for this hose. Avoid long drain hose runs, or elevating the hose more than 8 feet above the floor.

Install Salt Storage Tank Overflow Hose

1. Measure, cut to needed length and connect the 3/8" drain line (provided) to the salt storage tank overflow elbow and secure in place with a hose clamp.
2. Route the hose to the floor drain, or other suitable drain point no higher than the drain fitting on the salt storage tank (This is a gravity drain). If the tank overfills with water, the excess water flows to the drain point. Cut the drain line to the desired length and route it neatly out of the way.

IMPORTANT: For proper operation of the water softener, do not connect the water softener valve drain tubing to the salt storage tank overflow hose.

Test for Leaks

To prevent air pressure in the water softener and plumbing system, complete the following steps in order:

1. Fully open two or more softened cold water faucets close to the water softener, located downstream from the water softener.
2. Place the bypass valve (single or 3 valve) into the "bypass" position. See Figures 7 & 8 on Page 7.
3. Slowly open the main water supply valve. Run water until there is a steady flow from the opened faucets, with no air bubbles.
4. Place bypass valve(s) in "service" or soft water position as follows:
   • Single bypass valve: Slowly move the valve stem toward "service," pausing several times to allow the water softener to fill with water.
   • 3 valve bypass: Fully close the bypass valve and open the outlet valve. Slowly open the inlet valve, pausing several times to allow the water softener to fill with water.
5. After about three minutes, open a hot water faucet until there is a steady flow and there are no air bubbles, then close this faucet.
6. Close all cold water faucets and check for leaks at the plumbing connections that you made.
7. Check for leaks around clips at softener's inlet and outlet. If a leak occurs at a clip, depressurize the plumbing (turn off the water supply and open faucets) before removing clip. When removing clips at the softener's inlet or outlet, push the single bypass valve body toward the softener (See Figure 15). Improper removal may damage clips. Do not reinstall damaged clips.

FIG. 15: Depressurizing and pushing bypass valve body when removing clips

Add Water and Salt to the Salt Storage Tank

1. Using a container, add about three gallons of clean water into the salt storage tank.
2. Add salt to the storage tank. Use nugget, pellet or coarse solar salts with less than 1% impurities.

Plug in the Power Supply

During installation, the water softener wiring may be moved or jostled from place. Check to be sure all leadwire connectors are secure on the back of the electronic board and be sure all wiring is away from the valve gear and motor area, which rotates during regenerations.

1. Plug the water softener's power supply into an electrical outlet that is not controlled by a switch and is approved by local codes.

NOTE: The water heater is filled with hard water and, as hot water is used, it will refill with conditioned water. In a few days, the hot water will be fully conditioned. To have fully conditioned hot water immediately, wait until the initial recharge is over. Then, drain the water heater (following instructions for water heater) until water runs cold.

Sanitize the Water Softener / Sanitize After Service

Care is taken at the factory to keep your unit clean and sanitary. Materials used to make the unit will not infect or contaminate your water supply, and will not cause bacteria to form or grow. However, during shipping, storage, installation and operation, bacteria could get into the unit. For this reason, sanitizing as follows is suggested* when installing.

1. Slide open the salt lid, remove the brinewell cover and pour about 3 oz. (6 tablespoons) of household bleach into the softener brinewell. Replace the brinewell cover.
2. Make sure the bypass valve(s) is in the "service" (open) position.
3. Start a recharge: Press the RECHARGE button and hold for 3 seconds, until "Recharge Now" begins to flash in the display. This recharge draws the sanitizing bleach into and through the water softener. Any air remaining in the unit is purged to the drain.
4. After the recharge has completed, fully open a cold water faucet, downstream from the softener, and allow 50 gallons of water to pass through the system. This should take at least 20 minutes. Close the faucet.

*Recommended by the Water Quality Association. On some water supplies, the unit may need periodic disinfecting.

Restart the Water Heater

1. Turn on the electricity or fuel supply to the water heater and relight the pilot, if applicable.

NOTE: The water heater is filled with hard water and, as hot water is used, it refills with conditioned water. In a few days, the hot water will be fully conditioned. To have fully conditioned hot water immediately, wait until the initial recharge (previous step) is over. Then, drain the water heater (following instructions for water heater) until water runs cold.

Program the Controller

1. Install the softener's top cover and salt lid.
2. Complete the Programming Steps on Pages 12 & 13.

Programming the Water Softener

Status Light / Clean Reminder

When the water softener is connected to electrical power, the status light above the control panel will operate as follows:

FIG. 17: "CLn" Display Example

This is a reminder to use Rheem® RHWSC Water Softener Cleaner (P/N RHWSC21) three times a year. To reset the timer, press any button on the control panel and the flashing words will disappear. The status light will stop flashing, unless the system is also low on salt.

Program the Softener

When the power supply is plugged into the electrical outlet, the model code (rH42) and a software version number (example: J4.0), are briefly shown in the display. Then the words "PRESENT TIME" appear and "12:00 PM" begins to flash.

FIG. 19: Initial Display - Model Code and Software Version

FIG. 20: "PRESENT TIME" Display Example

Step 1. Set Present Time of Day

If the words "PRESENT TIME" do not show in the display, press the SELECT button a few times until they do.

1. Press the ⬆️ UP or ⬇️ DOWN buttons to set the present time. Up moves the display ahead; down sets the time back.

NOTE: Press buttons and quickly release to slowly advance the display. Hold the buttons down for fast advance.

2. When the correct time is displayed, press the SELECT button, and the display will change to show the "Hardness" screen.

Step 2. Set Water Hardness Number

If you completed the previous step, the word "HARDNESS" should show in the display. Otherwise, press the SELECT button several times until it does.

FIG. 21: "HARDNESS" Display Example

1. Press the ⬆️ UP or ⬇️ DOWN buttons to set the hardness of your water supply, in grains per gallon. The default is 25.

NOTE: If your water supply contains iron, compensate for it by adding to the water hardness number. For example, assume your water is 20 gpg hard and contains 2 ppm iron. Add 5 to the hardness number for each 1 ppm of iron. In this example, you would use 30 for your hardness number.

Example Calculation:
2 ppm iron x 5 = 10 (times)
20 gpg hardness + 10 = 30 HARDNESS NUMBER

2. When finished setting your water's hardness number, press the SELECT button, and the display will change to show the "Recharge Time" screen.

Step 3. Set Recharge (Regeneration) Start Time

If you completed the previous step, the words "RECHARGE TIME" should show in the display. Otherwise, press the SELECT button several times until they do.

FIG. 22: "RECHARGE TIME" Display Example

1. The softener's default recharge start time is 2:00 AM. This is normally a time of day when water is not being used in the household. Hard water bypasses the softener if the household draws water during the recharge cycle. If a different recharge start time is desired, press the ⬆️ UP or ⬇️ DOWN buttons to change the time, in 1-hour increments. Be sure AM or PM is correct.

2. When the desired recharge start time is displayed, press the SELECT button, and the display will change to show one of the salt type screens in Fig. 23.

Step 4. Set Salt Type

If you completed the previous step, either "NaCl" (for Sodium Chloride) or "KCl" (for Potassium Chloride) should show in the display. Otherwise, press the SELECT button several times until one of them does.

FIG. 23: Salt Type Display Examples (NaCl, KCl)

1. Press the ⬆️ UP or ⬇️ DOWN buttons to set the type of salt you will be using in your water softener. The default is NaCl (standard Sodium Chloride water softener salt). If you will be using KCl (Potassium Chloride) instead, be sure to set salt type to KCl. This setting adjusts the regeneration cycle times to compensate for the different rate at which KCl dissolves. See also Page 19 for more information on salt types.
2. When the correct salt type is displayed, press the SELECT button. The display returns to the normal time of day screen.

FIG. 24: Normal Time of Day Display

Controller Features

Extra Recharge

Sometimes, a manually initiated recharge (regeneration) may be desired, or needed. Two examples are:

• You have used more water than usual (guests visiting) and you may run out of soft water before the next automatic regeneration.
• You did not add salt to the softener before it ran out. Add salt to the softener before regenerating.

You can start a regeneration immediately, or you can set the controller to regenerate at the next preset recharge time (2:00 AM, or as set).

Recharge Now

Press the RECHARGE button and hold for 3 seconds, until the words "RECHARGE", "Serv" and "Fill" begin to flash in the display. The softener enters the fill cycle of regeneration immediately. This regeneration will take about 2 hours to complete. Then, you will have soft water again.

NOTE: If the "Clean Feature" is set ON, the normal regeneration cycle is preceded by a cleaning backwash and rinse. The words "CLEAN" and "Bkwsh" or "Rinse" flash in the display, along with the minutes of the clean cycle remaining.

FIG. 25: "RECHARGE NOW" Display Example

Recharge Tonight

Press and release (do not hold) the RECHARGE button. "RECHARGE TONIGHT" will begin flashing in the display, and the softener will begin regeneration at the next preset recharge time (2:00 AM, or as set). If you decide to cancel the regeneration before it starts, press and release the RECHARGE button once more. "RECHARGE TONIGHT" will stop flashing in the display.

FIG. 26: "RECHARGE TONIGHT" Display Example

Salt Monitor System

The water softener has a status light to remind you to add salt to the storage tank.

NOTE: You must set salt level each time salt is added to the water softener.

NOTE: The salt monitor system estimates salt levels, and accuracy will vary with different salts.

To set this monitor system:

1. Lift the salt lid and level the salt in the storage tank.
2. The salt level scale, on the brinewell inside the tank, has numbers from 0 to 8 (see Fig. 27). Observe the highest number the leveled salt is at, or closest to.

FIG. 27: Salt Level Scale on Brinewell

3. Press the SET SALT LEVEL button as many times as necessary to make the salt level bars in the display (see Fig. 27) match the number on the brinewell. At level 2 or below, the status light will flash.
4. If you want to turn the salt monitor off, press the SET SALT LEVEL button past 8, until "OFF" shows in the display next to the number 8.

FIG. 28: "OFF" Setting for Salt Monitor

Optional Settings

• SALT EFFICIENCY
• CLEAN FEATURE
• CLEAN FEATURE MINUTES
• MAXIMUM DAYS BETWEEN REGENERATIONS
• 12 / 24 HOUR CLOCK
• BACKWASH & FAST RINSE TIMES

1. To set any of these options, press and hold SELECT for 3 seconds until "000" shows in the display. Then press (do not hold) SELECT again to display one of the "Salt Efficiency" screens shown below.

FIG. 29: "Salt Efficiency" Icon Display

Salt Efficiency:

When this feature is ON, the water softener will operate at salt efficiencies of 4000 grains of hardness per pound of salt or higher. The softener may recharge more often using smaller salt dosage and less water. This softener is shipped with the efficiency feature set OFF. Use the ⬆️ UP or ⬇️ DOWN buttons to change between OFF and ON.

California Efficiency Requirement

Your Rheem® Water Softener has a "High Efficiency" feature that can be set ON or OFF. This softener is shipped with the efficiency feature set OFF, which will utilize the maximum rated capacity while most often achieving maximum salt efficiencies. When installing this unit in the State of California, you MUST turn the efficiency feature ON. The softener may initiate more frequent recharges, but it will operate at 4000 grains per pound of salt or higher.

2. Press SELECT again to display one of the "Clean" screens shown below.

FIG. 30: "Clean Feature" Display (OFF/ON)

Clean Feature:

This feature is beneficial on water supplies containing iron and/or high amounts of sediments (sand, silt, dirt, etc.). When set to ON, a backwash and fast rinse cycle will occur first, preceding the normal regeneration sequence. This provides extra cleaning of the resin bed before it is regenerated with the salt brine. To conserve water, if your water supply does not contain iron or sediments, be sure this feature is set to OFF. The default is OFF. Use the ⬆️ UP or ⬇️ DOWN buttons to change between OFF and ON.

3. Press SELECT again to display the "Clean Time" screen shown below.

FIG. 31: "Clean Time" Display

Clean Feature Minutes:

If you have set the Clean Feature ON, the length of the extra backwash cycle automatically is set to 3 minutes. However, you can adjust this time from 1 to 15 minutes in length. To change this cycle time, use the ⬆️ UP button to increase the time, or the ⬇️ DOWN button to shorten the time. If no change is desired, continue to next step.

4. Press SELECT again to display the "Recharge Days" screen.

FIG. 32: "Recharge Days" Display Example

Maximum Days Between Recharges:

The electronic controller automatically determines recharge frequency. This provides the greatest operating efficiency and, under most conditions this feature will be left in its default mode. However, you can set this feature to force a recharge every set number of days. You may want to do this if, for example, your water supply contains iron and you want the softener to recharge at least once every few days to keep the resin bed clean. Use the ⬆️ UP or ⬇️ DOWN buttons to change the number of days (up to 15).

5. Press SELECT again to display the "12 or 24 hr" screen.

FIG. 33: "12 or 24 hr Clock" Display

12 or 24 Hour Clock:

All time displays are shown in standard clock time (1 to 12 AM; and 1 to 12 PM) at the 12 hr default setting. If 24 hour time format is desired, set to 24 hr by pressing the ⬆️ UP button.

6. Press SELECT again to display the backwash time "Add" screen.

FIG. 34: "Backwash Time Add" Display

Backwash & Fast Rinse Times:

If you experience salty tasting water after recharge, you may need to increase the backwash and fast rinse times. The cycle times during recharge are determined by the softener's electronic controller. However, you may increase the backwash and fast rinse times, in 1 minute increments.

If you wish to increase the backwash time, use the ⬆️ UP or ⬇️ DOWN buttons to add up to 15 minutes. Then press the OK button to display the fast rinse time "Add" screen.

FIG. 35: "Fast Rinse Time Add" Display

If you wish to increase the fast rinse time, use the ⬆️ UP or ⬇️ DOWN buttons to add up to 15 minutes.*

7. Press SELECT to return to the normal run (time of day) screen.

FIG. 36: Normal Run Display with Water Flow Bars

* Setting backwash and/or fast rinse times too low may result in salty tasting water after regeneration.

Tank Light

To turn on the light inside the salt storage tank, press the TANK LIGHT button on the faceplate. Press this button again to turn the light off. It will also turn off automatically after 15 minutes.

FIG. 37: Tank Light Icon on Display

Water Flow Through the Softener

If soft water is in use, the water flow bars continually scroll across the display. The bars scroll slowly when water flow is slow, and move faster as water flow increases. The flow bars do not show when all faucets and water using appliances are off.

FIG. 38: Water Flow Bars Display Examples

Recharge Time Remaining & Valve Position Indicators

One of the valve position indicators (Serv, Fill, Brine, Bkwsh, Rinse) is displayed while the softener is recharging. RECHARGE flashes in the display and, beginning with Brine, the minutes of recharge remaining before return to service appears in place of the present time. When the valve is moving from one cycle to another, both position indicators are flashing.

FIG. 39: Recharge Time Remaining and Valve Position Indicators

Program Memory

If electrical power to the softener goes off, the time display is blank but the electronic controller keeps the correct time for several hours. When electrical power comes on again, you will have to reset the present time only if the display is flashing. The HARDNESS and RECHARGE TIME never require resetting unless a change is desired. Even if the clock is incorrect after a long power outage, the softener works as it should to keep your water soft, however, regenerations may occur at the wrong time of day until you reset the clock to the correct time of day.

Cleansing Feature

The cleansing feature keeps larger particles of sediment from entering the home's plumbing system. As water passes through the softener, the larger sediment particles are collected in the integrated basket and then rinsed to the drain before each regeneration. The cleansing feature provides added protection for water using appliances by reducing the chance of larger particles entering the various products valves and screens. The "Clean Feature" may be turned ON to provide an extra backwash that will help keep the cleansing screen clean. The default is OFF.

IMPORTANT: The cleansing feature is not intended to replace pretreatment filtration. For problem water applications, additional sediment filtration is recommended.

FIG. 40: Cleansing Screen Diagram

Bypass Blending Valve

The bypass blending valve works as a typical push-pull bypass valve, but has the added ability to finely adjust hardness of the treated water leaving the water softener. If slightly harder water is desired than is normally output by the water softener, this bypass blending valve can divert a small stream of hard water before it enters the water softener and blend it with the exiting softened water. The amount of water diverted is controlled by turning a blend adjusting knob on the end cap of the valve stem (See Figure 41).

IMPORTANT: Turn the blend adjusting knob by hand only. Do not overtighten.

1. When the bypass valve is in service position (normal softener operation), with handle pulled all the way out (See Figure 41), increase hardness of treated water by turning the blend adjusting knob counterclockwise up to 6 turns from the fully closed position. Before turning the knob, unlock it, if necessary, by turning the hex nut counterclockwise. While adjusting the knob, hold the bypass valve handle to prevent the stem from rotating.
2. Do not continue to turn the knob counterclockwise beyond 6 turns from the fully closed position, as this would eventually pull the screw's internal o-rings out of their seat and water would leak from the bypass valve.
3. Decrease hardness of treated water by turning the blend adjusting knob clockwise while holding the bypass handle. Do not overtighten. When the knob is fully closed, hard water is not being blended with treated water.
4. Once the desired hardness is achieved, the adjustment knob may be locked in place by tightening the hex nut clockwise against the end cap using an adjustable wrench. Hold the bypass valve handle to prevent the stem from rotating, or else use another wrench to grip the stem on the flats between the end cap and the bypass valve body. Loosen the hex nut (turn it counterclockwise) before readjusting the hardness or closing the diversion path for servicing (see next step)
5. If the water softener is to be serviced or disconnected from the bypass valve, the blend adjusting knob must be closed to block the diversion path and prevent water leaking from the softener valve inlet of the bypass valve.

FIG. 41: Bypass Blending Valve - Service Position

FIG. 42: Bypass Blending Valve - Bypass Position

Routine Maintenance

Adding Salt

Lift the salt lid and check the salt storage level frequently. If the water softener uses all the salts before you refill it, you will experience hard water. Until you have established a refilling routine, check the salt every two or three weeks. Always add if less than 1/4 full. Be sure the brinewell cover is on.

NOTE: In humid areas, it is best to keep the salt storage level lower, and to refill more often to avoid salt "bridging".

Recommended Salt: Nugget, pellet or coarse solar salts with less than 1% impurities.

Salt Not Recommended: Rock salt, high in impurities, block, granulated, table, ice melting, ice cream making salts, etc.

Breaking a Salt Bridge

Sometimes, a hard crust or salt "bridge" forms in the brine tank. It is usually caused by high humidity or the wrong kind of salt. When the salt "bridges," an empty space forms between the water and the salt. Then, salt will not dissolve in the water to make brine. Without brine, the resin bed is not recharged and hard water will result.

If the storage tank is full of salt, it is difficult to tell if you have a salt bridge. A bridge may be underneath loose salt. Take a broom handle, or like tool, and hold it next to the water softener. Measure the distance from the floor to the rim of the water softener. Then, carefully push the broom handle straight down into the salt. If a hard object is felt before the pencil mark is even with the top, it is most likely a salt bridge. Carefully push into the bridge in several places to break it. Do not use any sharp or pointed objects as you may puncture the brine tank. Do not try to break the salt bridge by pounding on the outside of the salt tank. You may damage the tank.

FIG. 43: Breaking a Salt Bridge Diagram

Cleaning the Nozzle & Venturi

A clean nozzle & venturi (See Figure 44) is a necessity for the water softener to work properly. This small component creates the suction to move brine from the brine tank, into the resin tank. If it should become plugged with sand, silt, dirt, etc., the water softener will not work, and hard water will result.

FIG. 44: Nozzle & Venturi Assembly Components Diagram

To get access to the nozzle & venturi, remove the water softener's top cover. Put the bypass valve(s) into the bypass position. Be sure the water softener is in soft water (service) cycle (no water pressure at nozzle & venturi). Then, holding the nozzle & venturi housing with one hand, unscrew the cap. Do not lose the o-ring seal. Lift out the screen support and screen. Then, remove the nozzle & venturi disc, gasket and flow plug(s). Wash the parts in warm, soapy water and rinse in fresh water. Be sure to clean both the top and bottom of the nozzle & venturi disc. If needed, use a small brush to remove iron or dirt. Do not scratch, misshape, etc., surfaces of the nozzle & venturi.

Carefully replace all parts in the correct order. Lubricate the o-ring seal with silicone grease and locate in place. Install and tighten the cap by hand, while supporting the housing. Overtightening may break the cap or housing. Put the bypass valve(s) into service (soft water) position.

Recharge the softener to reduce water level in the tank. This will also assure that the softener is completely recharged and ready to provide softened water again. Check the water level in the tank by looking down the brinewell. If the water level does not drop after a recharge, the problem has not been resolved. Call 1-800-754-7027.

Protect the Water Softener from Freezing

If the softener is installed where it could freeze (summer cabin, lake home, etc.), you must drain all water from it to stop possible freeze damage. To drain the softener:

1. Close the shut-off valve on the house main water pipe, near the water meter or pressure tank.
2. Open a faucet in the soft water pipes to vent pressure in the softener.
3. Move the stem in the single bypass valve to bypass. Close the inlet and outlet valve in a 3 valve bypass system, and open the bypass valve. If you want water in the house pipes again, reopen the shut-off valve on the main water pipe.
4. Unplug the power supply at the wall outlet. Remove the softener's top cover, together with the salt lid. Take off both drain hoses if they will interfere with moving the softener into position over the drain.
5. Carefully remove the large holding clips at the softener inlet and outlet. Separate the softener from the plastic installation adaptors, or from the bypass valve.
6. Lay a piece of 2 inch thick board near the floor drain (See Figure 45).
7. Move the softener close to the drain. Slowly and gently, tip it over until the rim rests on the wood block with the inlet and outlet over the drain. Do not allow the softener's weight to rest on the inlet and outlet fittings or they may break.
8. Tip the bottom of the softener up a few inches and hold until all water has drained. Leave the softener laying like this until you are ready to use it. Plug the inlet and outlet with clean rags to keep dirt, bugs, etc. out.

FIG. 45: Using a Wood Block to Tip Softener for Draining

Troubleshooting Guide

Manually Initiated Electronic Diagnostics

1. To enter diagnostics, press the SELECT button and hold for three seconds. The display will change to show turbine count, valve cycle position, and position switch status (open or closed).

FIG. 46: Diagnostic Display Readouts (Turbine Count, Valve Position, Position Switch)

Turbine Operation: If no water is flowing through the softener, the turbine indicator displays three zeros. When water is flowing, a 000 to 140 count repeats for each gallon of water passing through the turbine. To check for positive operation of the turbine if zeros are shown, open a nearby soft water faucet and observe the turbine count. If you don't get a reading in the display with faucet open, pull the sensor housing from the valve outlet port (see Fig. 47). Pass a small magnet back and forth in front of the sensor. You should get a reading in the display. If you get a reading, unhook the inlet and outlet plumbing and check the turbine for binding.

Position Switch Status: With the valve in service, or any of the recharge cycle positions, the position switch indicator will show the switch open. While the valve is rotating from one position to another, the position switch indicator will show the switch closed. There is likely a problem if indications vary from this pattern.

FIG. 47: Motor and Turbine Sensor Assembly Diagram

Other Information

While in the diagnostics screen, the following information is available and may be beneficial for various reasons. This information is retained by the electronic controller from the first time electrical power is applied to the unit.

• Press and hold the ⬆️ UP button to display the number of days this controller has had electrical power applied.
• Press and hold the ⬇️ DOWN button to display the number of regenerations initiated by this controller since the model code number was entered.

NOTE: If the electronic controller is left in the diagnostic display (or a flashing display when setting times or hardness), the normal time of day display automatically returns if a button has not been pressed for 4 minutes. To return to the diagnostic display, repeat step 1, above.

Resetting to Factory Defaults

To reset the electronic controller to its factory default for all settings (time, hardness, etc.):

1. Press the SELECT button and hold it until the display changes twice to show the flashing model code.
2. Press the ⬆️ UP button to display a flashing "SoS".

FIG. 48: Factory Reset Display (Model Code and "SoS")

3. Press the SELECT button, and the electronic controller will restart.
4. Set the present time, hardness, etc., as described on pages 12 & 13.

Manual Advance Recharge Check

This check verifies proper operation of the valve motor, brine tank fill, brine draw, recharge flow rates, and other controller functions. Always make the initial checks first, and perform the manually initiated electronic diagnostics.

NOTE: The display must show a steady time (not flashing). If an error code shows, first press the SELECT button to enter the diagnostic display.

1. Press the RECHARGE button and hold in for 3 seconds. "RECHARGE", "Serv" and "Fill" begin to flash in the display as the softener enters the fill cycle of regeneration.
2. When valve reaches "Fill" position, remove the brinewell cover and, using a flashlight, observe fill water entering the tank.
3. If water does not enter the tank, look for an obstructed nozzle, venturi, fill flow plug, brine tubing, or brine valve riser pipe.
4. After observing fill, press the RECHARGE button to move the softener into brining. A slow flow of water to the drain will begin. Verify brine draw from the brine tank by shining a flashlight into the brinewell and observing a noticeable drop in the liquid level.
5. If the softener does not draw brine:
   • nozzle and/or venturi dirty
   • nozzle and venturi not seated properly on gasket
   • restricted drain (check drain fitting and hose)
   • ineffective nozzle and venturi seal
   • other inner valve problem (rotor seal, rotor & disc, wave washer, etc.)

FIG. 49: Valve Motor and Cam Assembly Diagram

NOTE: If water system pressure is low, an elevated drain hose may cause back pressure, stopping brine draw.

6. Again press RECHARGE to move the softener into backwash. Look for a fast flow of water from the drain hose.
7. An obstructed flow indicates a plugged top distributor, backwash flow plug or drain hose.
8. Press RECHARGE to move the softener into fast rinse. Again look for a fast drain flow. Allow the softener to rinse for a few minutes to flush out any brine that may remain in the resin tank from the brining cycle test.
9. To return the softener to service, press RECHARGE once more.

Wiring Schematic

FIG. 50: Electrical Wiring Schematic

Exploded View & Parts List

Softener Exploded View

The diagram shows the various components of the water softener assembly with numbered parts.

Softener Parts List

Not illustrated.

Valve Exploded View

The diagram shows the various components of the valve assembly with numbered parts.

Valve Parts List

Not illustrated.

Extend Your Warranty

Use Rheem® RHWSC Water Softener Cleaner and register at rheemwatertreatment.com.

The factory warranty for your water softener is shown below. The one year full warranty period on parts and labor can be extended to five (5) years from the date of purchase if you use Rheem® RHWSC Water Softener Cleaner on your system, and register your purchase of Rheem® RHWSC Water Softener Cleaner at rheemwatertreatment.com. Use one bottle of Rheem® RHWSC Water Softener Cleaner, as directed, every four months from the date of purchase of the water softener. Purchase of no more than three (3) bottles of Rheem® RHWSC Water Softener Cleaner in a 12 month period may be applied toward compliance with this warranty. Use of any water softener additive other than Rheem® RHWSC will not provide extended warranty coverage.

Water Softener Warranty - Model RHS42

Warrantor: Water Channel Partners, 1890 Woodlane Drive, Woodbury, MN 55125

Warrantor guarantees, to the original owner, that:

One Year Full Warranty:

• For a period of one (1) year from the date of purchase, all parts will be free from defects in materials and workmanship and will perform their normal functions.
• For a period of one (1) year from the date of purchase, labor to repair or replace any part deemed to be defective in materials or workmanship, will be provided at no additional cost.

Limited Warranties:

• For a period of ten (10) years from the date of purchase, the salt storage tank and fiberglass mineral tank will not rust, corrode, leak, burst, or in any other manner, fail to perform its proper functions.
• For a period of three (3) years from the date of purchase, the electronic control board will be free of defects in materials and workmanship and will perform its normal functions.

If, during such respective period, a part proves to be defective, Warrantor will ship a replacement part, directly to your home, without charge. After the first year, labor necessary to maintain this product is not covered by the product warranty. If you have questions regarding a warranted product, need assistance with installation or troubleshooting, wish to order a part or report a warranty issue, we are just a phone call away. SIMPLY DIAL 1-800-754-7027 for assistance.

General Provisions

The above warranties are effective provided the water softener is operated at water pressures not exceeding 125 psi, and at water temperatures not exceeding 120°F; provided further that the water softener is not subject to abuse, misuse, alteration, neglect, freezing, accident or negligence; and provided further that the water softener is not damaged as the result of any unusual force of nature such as, but not limited to, flood, hurricane, tornado or earthquake.

Warrantor is excused if failure to perform its warranty obligations is the result of strikes, government regulation, materials shortages, or other circumstances beyond its control.

*THERE ARE NO WARRANTIES ON THE WATER SOFTENER BEYOND THOSE SPECIFICALLY DESCRIBED ABOVE. ALL IMPLIED WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED TO THE EXTENT THEY MIGHT EXTEND BEYOND THE ABOVE PERIODS. THE SOLE OBLIGATION OF WARRANTOR UNDER THESE WARRANTIES IS TO REPLACE OR REPAIR THE COMPONENT OR PART WHICH PROVES TO BE DEFECTIVE WITHIN THE SPECIFIED TIME PERIOD, AND WARRANTOR IS NOT LIABLE FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES. NO WARRANTOR DEALER, AGENT, REPRESENTATIVE, OR OTHER PERSON IS AUTHORIZED TO EXTEND OR EXPAND THE WARRANTIES EXPRESSLY DESCRIBED ABOVE.

Some states do not allow limitations on how long an implied warranty lasts or exclusions or limitations of incidental or consequential damage, so the limitations and exclusions in this warranty may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from state to state. This warranty applies to consumer-owned installations only.

Rheem®, Rheem Preferred, Rheem Preferred Plus, and Rheem Preferred Platinum logos and product names are trademarks of Rheem Manufacturing Company, and are used under license. All rights reserved.