Rheem RHS42 User manual

Model RHS42
System tested and certified by NSF International
against NSF/ANSI Standard 44
for hardness reduction, efficiency and the
reduction of barium and radium 226/228,
and certified to NSF/ANSI Standard 372.
7386473 (Rev. A 11/10/20)
Manufactured and warranted by
Water Channel Partners
1890 Woodlane rive
Woodbury, MN 55125
Installati n and Operati n Manual
PRODUCT AND WARRANTY
REGISTRATION
Register your product
online to validate and
extend your warranty.
See warranty page for
details.
www.rheemwatertreatment.com
How to install, operate
and maintain your emand
Controlled Water Softener
If you have any questions or concerns when
installing, operating or maintaining your water
softener, call our toll free number:
1-800-754-7027
or visit www.rheemwatertreatment.com
When you call, please be prepared to provide
the model and serial number of your product,
found on the rating decal inside the salt lid.

2
TAB E OF CONTENTS
Page
Specifications & Performance Claims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Inspect Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Water Conditioning Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Programming the Water Softener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-13
Controller Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-17
Bypass Blending Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-20
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-23
Exploded View & Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-27
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Dimensi ns
FRONT VIEWSIDE VIEW
TOP VIEW
3-3/4"
IN
OUT
41-3/4"
IN - OUT
48"
20-1/2"
15-1/4"
41-3/4”
20-1/2”
OUT
IN
IN – OUT
FIG. 1
FRONT VIEWSI E VIEW
48”
15-1/4”
3-3/4”
TOP VIEW

3
Specificati ns & Perf rmance Claims
This model is efficiency rated. The efficiency rating is valid only at the minimum salt dose. This system has a
demand initiated regeneration ( .I.R.) feature that complies with specific performance specifications intended to min-
imize the amount of regenerant brine and water used in their operation.
This water softener has a rated softener efficiency of not less than 3,350 grains of total hardness exchange per
pound of salt (based on sodium chloride) and shall not deliver more salt than its listed rating or be operated at a
sustained maximum service flow rate greater than its listed rating. This system has been proven to deliver soft
water for at least ten continuous minutes at the rated service flow rate. The rated salt efficiency is measured by lab-
oratory tests described in NSF/ANSI Standard 44. These tests represent the maximum possible efficiency that the
system can achieve. Operational efficiency is the actual efficiency after the system has been installed. It is typically
less than the rated efficiency, due to individual application factors including water hardness, water usage, and other
contaminants that reduce a softener's capacity.
*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.
Model RHS42
Model Code rH42
Rated Softening Capacity (Grains @ Salt ose)
12,400 @ 2.5 lbs.
29,900 @ 8.0 lbs.
42,400 @ 16.3 lbs.
Rated Efficiency (Grains/Pound of Salt @ Minimum Salt ose) 5,010 @ 2.5 lbs.
Water Used uring Regeneration @ Minimum Salt ose 2.5 gallons / 1,000 grains
Total Water Used Per Regeneration @ Maximum Salt ose 45.9 gallons
Rated Service Flow Rate 9.9 gpm
Amount of High Capacity Ion Exchange Resin 1.20 cu. ft.
Pressure rop at Rated Service Flow 12.0 psig
Intermittent Flow Rate @ 30 psi* 22.4 gpm
Water Supply Max. Hardness 140 gpg
Water Supply Max. Clear Water Iron 11 ppm**
Water Pressure Limits (min. / max.) 20 - 125 PSI
Water and Ambient Temperature Limits (min. / max.) 40 - 120 °F
Minimum Water Supply Flow Rate 3 gpm
Maximum rain Flow Rate 2.0 gpm
Questions? Call Toll Free 1-800-754-7027 or visit www.rheemwatertreatment.com
When you call, please be prepared to provide the model and serial number,
found on the rating decal inside the salt lid.

4
Bef re Y u Start
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.
=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 C 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.
=o not use this system to treat water that is microbiologically unsafe or of unknown quality without adequate dis-
infection upstream or downstream of the system.
European irective 2002/96/EC requires all electrical and electronic equipment to be disposed of accord-
ing 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 prop-
er disposal of this equipment.
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.
D n t return the water s ftener t st re.
If you have any questions, or there are missing parts or damage, please call Toll Free 1-800-754-7027
or visit www.rheemwatertreatment.com
When you call, please be prepared to provide the model and serial number, found on the rating decal
inside the salt lid.

5
FIG. 2
rain HoseBypass Valve
Adaptor Elbow
Installation
Adaptors
Hose Clamps
O-rings
Grommet
Clips
(2 are shipped installed
on the softener’s valve)
Inspect Shipment
Water C nditi ning Inf rmati n
IRON
Iron in water can cause stains on clothing and plumb-
ing 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 filtra-
tion. Chlorination is also recommended for bacterial
iron.
Colloidal and inorganically bound iron is of ferric or fer-
rous 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 sedi-
ment. 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.
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 ist

6
Installati n Requirements
P UMBING CODES
All plumbing must be completed in accordance with
national, state and local plumbing codes.
1-1/2”
air gap
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. o
not put the end of the drain hose into the drain.
FIG. 3
1-1/2”
air gap
rain
Hose
rain
Hose
1-1/2”
air gap
OCATION REQUIREMENTS
Consider all of the following when selecting an installa-
tion location for the water softener.
=o not locate the water softener where freezing
temperatures occur. o not attempt to treat water
over 120ºF. 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 regenera-
tion discharge (drain) water. Use a floor drain,
laundry tub, sump, standpipe, or other options
(check your local codes). See "Air Gap
Requirements" and "Valve rain Requirements"
sections.
=The water softener works on 24V C 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.
FIG. 4
Pressure
Tank
City Water Supply
Well Water Supply
Well
Pump
OR
Optional
Sediment
Filter
Water
Heater
Water
Softener
Untreated Water to
Outside Faucets
Hot Water
to House
Cold Water
to House
rain
Hose
AUNDRY TUBSTANDPIPE
F OOR DRAIN
THE PROPER ORDER TO INSTA WATER TREATMENT EQUIPMENT

7
Installati n Requirements
VA VE 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 com-
pression 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.
IN ET / OUT ET P UMBING 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 mainte-
nance 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: o not solder with plumbing attached to
installation adaptors and single bypass
valve. Soldering heat will damage the
adaptors and valve.
FIG. 8
SING E BYPASS VA VE
3 VA VE BYPASS
From Water
Softener
To Water
Softener
Inlet
Valve
Outlet
Valve
Bypass
Valve
FIG. 7
Pull out for “Service”
(Soft water)
Push in for
“Bypass”
FIG. 5
FIG. 6
1/4” NPT
Thread
Clip
Barbs
1/4 NPT
Threads
1/2” Outside ia.
Copper Tube
(not included)
Compression Fitting.
1/4 NPT x 1/2” O. .
Tube (not included)
Cut barbs from drain fit-
ting (pull clip to remove
fitting from valve)
Barbs for 3/8”
I. . Tubing
rain Hose
Hose Clamp

8
Installati n Instructi ns
TYPICA INSTA ATION
FIG. 9
NOTE: See “Air Gap Requirements” section.
Inlet
Outlet
Clips
Pipe
To Outside
Faucets
1” NPT Sweat
Adaptor (not
included)
O-ring
Single
Bypass Valve
Lubricated
O-ring
Soft
Water
Hard Water
Main Water Pipe
Water Softener
Valve
Valve rain
Elbow
Valve rain
Hose*
* o not connect the
water softener valve drain
tubing to the salt storage
tank overflow hose. Floor rain
Overflow
rain Elbow
Salt Storage
Tank Overflow
Hose* Secure Valve rain Hose
in place over Floor rain
1” NPT
Threaded
Adaptor
1-1/2”
air gap
Plug-in
Power
Supply
To
Controller
TURN OFF WATER SUPP Y
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 ele-
ments could result.
ASSEMB Y
1. Rheem®models are factory assembled. uring
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 ver-
tical (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.
MOVE THE UNIT INTO P ACE
1. Move the water softener into the desired location.
Set it on a solid, level surface.
IMPORTANT: o 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.
continued on next page

9
Installati n Instructi ns
continued from previous page
FIG. 13
Correct Assembly
Clip
Outside diameter
of clip channel on
single bypass valve
Outside diameter
of water softener
valve inlet & outlet
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.
2. Visually check and remove any debris from the
water softener valve inlet and outlet ports.
3. Make sure the turbine assembly spins freely in the
"out" port of the valve (See Figure 10).
4. If not already done, put a light coating of silicone
grease on the single bypass valve o-rings.
5. Push the single bypass valve into the softener valve
as far as it will go. Snap the two large holding clips
into place, from the top down as shown in Figures
12 & 13.
IMPORTANT: Be sure the clips snap firmly into place
so the single bypass valve will not pull
out.
FIG. 10
Turbine
Support
Valve Outlet Turbine
FIG. 12
Clip
Channel
Single Bypass Valve
COMP ETE IN ET AND OUT ET P UMBING
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 sof-
tener valve inlet side.
NOTE: Inlet and outlet are marked on the water sof-
tener 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 unsup-
ported plumbing may cause damage to
the valve.
Complete the inlet and outlet plumbing for the type of
pipes you will be using.
FIG. 11
Brine Tank
Overflow
Elbow
Brine Tank
Overflow
Grommet
13/16” Hole
Salt Lid
Salt
Storage
Tank
Float
Stem
Brine
Tubing
Brinewell
Cover
Stand
Tube
Brine
Valve
Brinewell
Top Cover
Nozzle & Venturi
Assembly

10
Installati n Instructi ns
CO D 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
Ground
Wire
Clamp (2)
INSTA VA VE 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 rain requirements" section.
2. Run the drain hose (or a rigid line) to the floor drain.
Secure drain hose. This will prevent “whipping'' dur-
ing regenerations. Be sure to provide a 1-1/2”
minimum air gap to prevent possible sewer
water backup. See “Air Gap Requirements" sec-
tion.
NOTE: In addition to a floor drain, you can use a laun-
dry 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.
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 soften-
er, do not connect the water softener
valve drain tubing to the salt storage
tank overflow hose.
TEST FOR EAKS
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 posi-
tion 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 bub-
bles, 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. o not
reinstall damaged clips.
INSTA SA T STORAGE TANK OVERF OW
HOSE

11
Installati n Instructi ns
FIG. 15
...depressurize the
plumbing, then push
Bypass Valve body
toward softener
If removing
clips...
ADD WATER AND SA T TO THE SA T
STOR AGE 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.
P UG IN THE POWER SUPP Y
uring 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 elec-
trical 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 condi-
tioned 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.
PROGRAM THE CONTRO ER
1. Install the softener’s top cover and salt lid.
2. Complete the Programming Steps on Pages 12 & 13.
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.
2Make 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 sanitiz-
ing 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 sys-
tem. 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.
Questions? Call Toll Free 1-800-754-7027 or visit www.rheemwatertreatment.com
When you call, please be prepared to provide the model and serial number,
found on the rating decal inside the salt lid.

12
Pr gramming the Water S ftener
isplay
SET SALT
LEVEL button
TANK LIGHT
button
RECHARGE
button
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 dis-
play. Then the words “PRESENT TIME” appear and
“12:00 PM” begins to flash.
STEP 1. SET PRESENT TIME OF DAY
If the words “PRESENT TIME" do not show in the dis-
play, press the SELECT button a few times until they do.
1. Press the rUP or sOWN 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.
continued on next page
FIG. 20
FIG. 19
FIG. 17
STATUS IGHT / C EAN REMINDER
When the water softener is connected to electrical
power, the status light above the control panel will
operate as follows:
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 con-
trol panel and the flashing words will disappear. The
status light will stop flashing, unless the system is
also low on salt.
UP button
SELECT
button
OWN
button
FIG. 18
Salt Lid
Status Light
(see below)
FIG. 16
Blue status light
indication Status
Flashing slowly
The salt monitor system indi-
cates a low salt level and
needs to be set. See “Salt
Monitor System” on Page 14.
Flashing slowly,
with “CLn” in the
display (Fig. 17)
Four months have elapsed on
the system’s timer since start
up or the last reset. See below.
Flashing rapidly,
with “PRESENT
TIME” in the dis-
play and the clock
flashing slowly
The present time needs to be
set, either during initial start up
or after a long power outage.
See “Set Present Time of
ay”, at right.
Flashing rapidly,
with “Err” in the
display
The electronic self-diagnostics
have detected a problem. See
“Troubleshooting” on Page 21.
On steady (not
flashing)
The system has power and
does not require any attention.

13
Pr gramming the Water S ftener
STEP 2. SET WATER HARDNESS NUMBER
If you completed the previous step, the word “HAR -
NESS" should show in the display. Otherwise, press
the SELECT button several times until it does.
1. Press the rUP or sOWN buttons to set the
hardness of your water supply, in grains per gallon.
The default is 25.
NOTE: If your water supply contains iron, compen-
sate 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.
20 gpg hardness
2 ppm iron x 5 = 10 +10
(times) 30 HAR NESS NUMBER
2. When finished setting your water’s hardness num-
ber, 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 “RE -
CHARGE TIME" should show in the display. Otherwise,
press the SELECT button several times until they do.
FIG. 21
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 rUP or
sOWN 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 SA T 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. 22
FIG. 24
FIG. 23
1. Press the rUP or sOWN 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.

14
C ntr ller Features
EXTRA RECHARGE
Sometimes, a manually initiated recharge (regenera-
tion) may be desired, or needed. Two examples are:
=You have used more water than usual (guests visit-
ing) 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 sec-
onds, until the words “RECHARGE”, “Serv” and “Fill”
begin to flash in the display. The softener enters the
fill cycle of regeneration immediately. This regenera-
tion 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.
RECHARGE TONIGHT
Press and release (do not hold) the RECHARGE but-
ton. “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 flash-
ing in the display.
3. Press the SET SALT LEVEL button as many times
as necessary to make the salt level bars in the dis-
play (see Fig. 27) match the number on the brine -
well. 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.
SA T 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.
8
7
6
5
4
Salt
Level
Numbers
Salt Level
Bars
Brinewell
FIG. 25
FIG. 26
FIG. 27
FIG. 28

15
C ntr ller Features
OPTIONA SETTINGS:
=SA T EFFICIENCY
=C EAN FEATURE
=C EAN FEATURE MINUTES
=MAXIMUM DAYS BETWEEN REGEN-
ERATIONS
=12 / 24 HOUR C OCK
=BACKWASH & FAST RINSE TIMES
1. To set any of these options, press and hold
SELECT for 3 seconds until “000” shows in the dis-
play. Then press (do not hold) SELECT again to
display one of the “Salt Efficiency” screens shown
below.
SA T EFFICIENCY: When this feature is ON, the
water softener will operate at salt efficiencies of
4000 grains of hardness per pound of salt or high-
er. 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 rUP or sOWN buttons to change
between OFF and ON.
Efficiency Icon
2. Press SELECT again to display one of the “Clean”
screens shown below.
C EAN: This feature is beneficial on water sup-
plies containing iron and/or high amounts of sedi-
ments (sand, silt, dirt, etc.). When set to ON, a
backwash and fast rinse cycle will occur first, pre-
ceding 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 sedi-
ments, be sure this feature is set to OFF. The
default is OFF. Use the rUP or sOWN but-
tons to change between OFF and ON.
3. Press SELECT again to display the “Clean Time”
screen shown below.
C EAN FEATURE MINUTES: If you have set the
Clean Feature ON, the length of the extra back-
wash cycle auto matically is set to 3 minutes.
However, you can ad just this time from 1 to 15
minutes in length. To change this cycle time, use
the rUP button to increase the time, or the s
OWN button to shorten the time. If no change is
desired, continue to next step.
continued on next page
FIG. 29
FIG. 30
FIG. 31
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 fea-
ture set OFF, which will utilize the maximum
rated capacity while most often achieving maxi-
mum 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.

16
4. Press SELECT again to display the “Recharge
ays” screen.
MAXIMUM DAYS BETWEEN RECHARGES:
The electronic controller automatically determines
recharge fre quency. 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
exam ple, 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
rUP or sOWN buttons to change the number
of days (up to 15).
5. Press SELECT again to display the “12 or 24 hr”
screen.
12 OR 24 HOUR C OCK: 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 r
UP button.
Example:
Set to 4 days maxi mum
between regenerations
efault isplay
6.Press SELECT again to display the backwash time
“Add” screen.
BACKWASH & FAST RINSE TIMES: If you expe-
rience salty tasting water after recharge, you may
need to increase the backwash and fast rinse
times. The cycle times during recharge are deter-
mined 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
rUP or sOWN buttons to add up to 15 min-
utes. Then press the OK button to display the fast
rinse time “Add” screen.
If you wish to increase the fast rinse time, use the
rUP or sOWN buttons to add up to 15 min-
utes.*
7. Press SELECT to return to the normal run (time of
day) screen.
* Setting backwash and/or fast rinse times too low
may result in salty tasting water after regeneration.
FIG. 32
FIG. 33
C ntr ller Features
FIG. 34
FIG. 35
FIG. 36

17
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 HAR NESS
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, regenera-
tions may occur at the wrong time of day until you
reset the clock to the correct time of day.
C EANSING FEATURE
The cleansing feature keeps larger particles of sedi-
ment from entering the home’s plumbing system. As
water passes through the softener, the larger sedi-
ment particles are collected in the integrated basket
and then rinsed to the drain before each regenera-
tion. 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.
TANK IGHT
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.
RECHARGE TIME REMAINING & VA VE
POSITION INDICATORS
One of the valve position indicators (Serv, Fill, Brine,
Bkwsh, Rinse) is displayed while the softener is
recharg ing. RECHARGE flashes in the display and,
beginning with Brine, the minutes of recharge remain-
ing before return to service appears in place of the
present time. When the valve is moving from one
cycle to another, both position indica tors are flashing.
WATER F OW 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.
Tank Light
Icon
Flow bars scroll when soft water is in use
Valve
Position
Indicator
Recharge
Time
Remaining
Top
istributor
Cleansing Screen
Resin
Tank
C ntr ller Features
FIG. 37
FIG. 38
FIG. 39
FIG. 40
Questions? Call Toll Free 1-800-754-7027 or visit www.rheemwatertreatment.com
When you call, please be prepared to provide the model and serial number,
found on the rating decal inside the salt lid.

18
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 (nor-
mal 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 counterclock-
wise. While adjusting the knob, hold the bypass
valve handle to prevent the stem from rotating.
2. o 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. o not overtighten. When the
knob is fully closed, hard water is not being blend-
ed with treated water.
4. Once the desired hardness is achieved, the adjust-
ment 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 discon-
nected 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
FIG. 42
SERVICE POSITION
(Normal Softener Operation)
BYPASS POSITION
Pull
Handle
Soft Water
Out Hard
Water In
Softener
Valve Outlet Softener
Valve Inlet
iverted Hard Water
(controlled by blend
adjusting knob)
Blend Adjusting Knob
Turn, by hand only,
counterclockwise to
increase hardness of
treated water (clockwise
to decrease hardness)
Push
Handle
Hard Water
Out Hard
Water In
Blend Adjusting Knob
If servicing water softener,
turn, by hand only,
clockwise until closed
Hex Nut
Turn clockwise
to lock blend
adjusting knob
(counterclock-
wise to unlock)

19
BREAKING A SA T 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 dis-
tance 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. o not use any sharp or pointed
objects as you may puncture the brine tank. o not
try to break the salt bridge by pounding on the out-
side of the salt tank. You may damage the tank.
ADDING SA T
Lift the salt lid and check the salt storage level fre-
quently. 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 stor-
age 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 impuri-
ties, block, granulated, table, ice melting, ice cream
making salts, etc.
R utine Maintenance
Questions? Call Toll Free 1-800-754-7027 or visit www.rheemwatertreatment.com
When you call, please be prepared to provide the model and serial number,
found on the rating decal inside the salt lid.
FIG. 43
Broom
Handle
Pencil
Mark
1” - 2”
Push Tool into
Salt Bridge to
Break
Salt Bridge
Salt
Empty Space
Water Level

20
R utine Maintenance
PROTECT THE WATER SOFTENER FROM
FREEZING
If the softener is installed where it could freeze (sum-
mer 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 pres-
sure 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 sof-
tener 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. o 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. 44
Cap
O-ring Seal
Screen Support
Screen
Gasket
*Flow Plug (HV C)
Housing
Ferrule
Nut
Cone Screen
*Flow Plug
*Install with lettered
side up, concave
side down.
C EANING THE NOZZ E & 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.
Nozzle & Venturi isc
IMPORTANT: Be sure small hole in the gasket is cen-
tered directly over the small hole in the nozzle & ven-
turi housing. Be sure the numbers are facing up.
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 noz-
zle & venturi). Then, holding the nozzle & venturi
housing with one hand, un screw the cap. o 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. o not
scratch, misshape, etc., surfaces of the nozzle & ven-
turi.
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 com-
pletely 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.
Floor rain FIG. 45
Wood Block