Rheem Residential Indoor Gas Tankless Water Heater User manual

Residential Indoor Gas
Tankless Water Heater
Warning: This water heater is not suitable
for use in manufactured (mobile) homes!
The purpose of this manual is twofold: one, to provide the
installer with the basic directions and recommendations
for the proper installation and adjustment of the water
heater; and two, to the owneroperator, to explain the
features, operation, safety precautions,maintenance and
troubleshooting of the water heater. This manual also
includes a parts list.
It is imperative that all persons who are expected to install,
operate or adjust this water heater read the instructions
carefully so they may understand how to perform these
operations. If you don't understand these instructions or
any terms within it, seek professional advice.
Any questions regarding the operation, maintenance,
service or warranty of this water heater should be directed
to the seller from whom it was purchased. If additional
information is required, refer to the section on If You Need
Service.
Do not destroy this manual. Please read carefully and keep
in a safe place for future reference.
Use&CareManual
With Installation Instructions for the Installer
136,000 BTU Max Input
Recognize this symbol as an indication of Important SafetyInformation!
California Proposition 65 Warning: This product contains chemicals known to the State of
California to cause cancer, birthdefects or other reproductive harm.
WARNING: If the in formation in these instructions is not followed exactly,
a fire or explosion may result causing property damage, personal injury or death.
Do not store or use gasoline or other
flammable vapors or liquids or other
combustible materials in the vicinity of this or
any other appliance. To do so may result in an
explosion or fire.
Do not try to light any appliance.
Do not touch any electrical switch; do not
use any phone in your building.
FOR YOUR SAFETY!
WHAT TO DO IF YOU SMELL GAS
Immediately call your gas supplier from a
neighbor's phone. Follow the gas
supplier's instructions.
If you cannot reach your gas supplier, call
the fire department.
Do not return to your home until authorized
by the gas supplier or fire department.
Improper installation, adjustment,
alteration, service or maintenance can cause
property damage, personal injury, or death.
Refer to this manual. Installation and service
must be performed by a qualified installer,
service agency or the gas supplier.
-
-
-
ON/OFF
UP
DOWN
F
OutputTemp
Set Temp
ErrorCode

Safety Information
Installation Instructions
Operating Instructions
Care and Cleaning
Troubleshooting Tips
Customer Service
Safety Precautions.......3-6
LPGasModels...........5
Location.................7
Water Connections......9-10
Gas Supply..............11
High Altitude............11
Venting..............12.15
Electrical Connection......16
Typical Installation........17
Pipe Insulation........... 18
Installation Checklist......19
LightingInstructions......20
Water Temperature.....21,22
Maintenance.............23
Housekeeping........ 23,24
Vent Inspection...........24
Burnner Inspection.............24
ExtendedShut-Down......24
Draining................25
Before You Call
ForService...........26,27
PartsList............... 28
.........
2
DANGER An imminently hazardous situation
that will result in death or serious
injury.
WARNING A potentially hazardous situation that
could result in death or serious injury
and/or damage to property.
CAUTION A potentially hazardous situation that
may result in minor or moderate
injury.
FOR YOUR RECORDS
Write the model and serial numbers here:
#
#
You can find them on a label on the appliance.
Proof of the original purchase date is needed to
obtain service under the warranty
Staple sales slip or cancelled check here.
READ THIS MANUAL
Inside you will find many helpful hints on how
to use and maintain your water heater properly.
A little preventive care on your part can save you
time and money over the life of your water heater.
You'll find many answers to common problems in the
Troubleshooting Guide. If you review the chart of
Troubleshooting Tips first, you may not need to call
for service.
READ THE SAFETY INFORMATION
Your safety and the safety of others are very important.
There are many important safety messages in this
manual and on your appliance. Always read and obey
all safety messages.
This is the safety alert symbol. Recognize this
symbol as an indication of Important Safety
Information!
This symbol alerts you to potential hazards that
can kill or hurt you and others.
All safety messages will follow the safety alert symbol
and either the word DANGER , WARNING ,
CAUTION or NOTICE .
These words mean:
Notice: Attention is called to observe a
specified procedure or maintain
a specific condition.

WARNING!
3
Be sure to read and understand the entire Use and Care Manual before attempting to install or operate
this water heater. It may save you time and money. Pay particular attention to the Safety Instructions.
Failure to follow these warnings could result in serious bodily injury or death. Should you have
problems understanding the instructions in this manual, or have any questions, STOP, and get help
from a qualified service technician, or the local gas utility.
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
Failure to properly install the water heater outdoors as outlined in the Installation
Instructions in this manual can result in unsafe operation of the water heater. To avoid
the risk of fire, explosion, or asphyxiation from carbon monoxide, never operate this
water heater unless it is installed properly and has an adequate air supply for proper
operation. Be sure to inspect the flue terminal for proper installation at initial start-up;
and at least annually thereafter. Refer to the Care and Cleaning section of this manual for
more information regarding flue terminal inspection.
DANGER!
INSTALL AND PROPERLY VENT THE WATER HEATER...
Gasoline, as well as other flammable materials and liquids (adhesives, solvents,
paint thinners etc.), and the vapors they produce are extremely dangerous. DO
NOT handle, use or store gasoline or other flammable or combustible materials
any where near or in the vicinity of a water heater or any other appliance. Be sure
to read and follow the labels on the water heater, as well as the warnings printed
in this manual. Failure to do so can result in property damage, bodily injury or
death.

DANGER!
WATER TEMPERATURE SETTING
Safety and energy conservation are factors to be considered when selecting the water
temperature setting . Water temperatures above 125 F
from scalding. Be sure to read and follow the warnings
ocan cause severe burns or death
outlined on the label pictured below.
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
Water temperature over 125 F can
cause severe burns instantly or
death from scalds.
°
Water Temperature Time To Produce a Serious Burn
125 F
o1/
12
to 2 minutes
130 F
oAbout 30 seconds
135 F
oAbout 10 seconds
140 F
oLess than 5 seconds
Table courtesy of Shriners Burn Institute
DANGER: Households with small children,
disabled, or elderly persons may require a 120 F.
Or lower temperature setting to prevent contact
with HOT water.
o
4
The factory setting allows operating
temperatures between 90 F and 140 F.
Notice:
oo
The temperature of the water at the outlet of the
water heater can be regulated by setting the
temperature on control panel . The control panel was
set at 110 F before it was shipped from the factory.
o
The illustration to the bottom left illustrates the
control panel and how to adjust the water
temperature.
Notice: When this water heater is supplying general
purpose hot water requirements for use by
individuals, a thermostatically controlled mixing
valve for reducing point of use water temperature is
recommended to reduce the risk of scald injury.
Contact a licensed plumber or the local plumbing
authority for further information.
The chart shown above may be used as a guide
in determining the proper water temperature for your
home.
Maximum water temperature occurs while burner is
on. To find water temperature being delivered, turn
on a hot water faucet and place a thermometer in the
water stream and read the thermometer.
Children, disabled and elderly are
at highest risk of being scalded.
Temperature limiting valves are
available, see manual.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Time/Temperature Relationship in Scalds
120 F
oMore than 5 minutes
F
ON/OFF
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Output Temp
Set Temp
Error Code
145 F
oLess than 3 seconds
150 F
oAbout 1 /
12
seconds
155 F
oAbout 1 second

DANGER!
NATURAL GAS AND LIQUEFIED PETROLEUM MODELS
Both LP and natural gas have an odorant added to aid in detecting a gas leak. Some
people may not physically be able to smell or recognize this odorant. If you are unsure or
unfamiliar with the smell of LP or natural gas, ask the gas supplier. Other conditions, such
as odorant fade , which causes the odorant to diminish in intensity, can also hide or
camouflage a gas leak.
Water heaters utilizing LP gas are
different from natural gas models. A
natural gas water heater will not function
safely on LP gas and vice versa.
No attempt should ever be made to
convert the water heater from natural
gas to LP gas. To avoid possible
equipment damage, personal injury or
f ire, do not connect the water heater to a
fuel type not in accordance with the unit
data plate; propane for propane units
and natural gas for natural gas units.
These units are not certified for any
other fuel type.
LP appliances should not be installed
below grade (for example, in a basement)
if such installation is prohibited by
federal, state and/or local laws, rules,
regulations or customs.
Propane or LP gas must be used with
great caution. It is heavier than air and
will collect first in lower areas making it
hard to detect at nose level.
Before attempting to light the water
heater, make sure to look and smell for
gas leaks. Use a soapy solution to check
all gas fittings and connections. Bubbling
ataconnectionindicatesaleakthatmust
be corrected. When smelling to detect a
gas leak, be sure to sniff near the floor
also.
Gas detectors are recommended in LP
and natural gas applications and their
installation should be in accordance with
the detector manufacturer's
recommendations and/or local laws,
rules, regulations or customs.
It is recommended that more than one
method, such as soapy solution, gas
detectors, etc., be used to detect leaks in
gas applications.
attempt to find the cause yourself.
try to light any appliance.
touch any electrical switch.
use any phone in your building.
Leave the house immediately and make
sure your family and pets leave also.
Leave the doors open for ventilation and
contact the gas supplier, a qualified
service agency or the fire department.
Stay away from the house (or building)
until the service call has been made, the
leak is corrected and a qualified agency
has determined the area to be safe.
Notice: If a gas leak is present or suspected:
Do not
Do not
Do not
Do not
5

Have the installer show you the location of the gas shut-off valve and how to shut it off if
necessary. Turn off the manual shut-off valve if the water heater has been subjected to
overheating, fire, flood, physical damage or if the gas supply fails to shut off.
Read this manual entirely before
installing or operating the water heater.
Use this appliance only for its intended
purpose as described in this Use and
Care Manual.
Be sure your appliance is properly
installed in accordance with local codes
and the provided installation
instructions.
SAFETY PRECAUTIONS
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING
WARNING!
For your safety, the information in this manual must be followed to minimize the risk of
fire or explosion, electric shock, or to prevent property damage, personal injury, or loss of
life.
California Law requires that residential water heaters must be braced, anchored or
strapped to resist falling or horizontal displacement due to earthquake motions. For
residential water heaters up to 52 gallon capacity, a brochure with generic earthquake
bracing instructions can be obtained from: Office of the State Architect, 400 P Street,
Sacramento, CA 95814 or you may call 916-445-8100 or ask a water heater dealer.
However, applicable local codes shall govern installation. For residential water heaters
of a capacity greater than 52 gallons or tankless-style, consult the local building
jurisdiction code for acceptable bracing procedures.
FOR INSTALLATIONS IN THE STATE OF CALIFORNIA
Part of your water heater unless it is
specifically recommended in this
manual. All other servicing should be
referred to a qualified technician.
READ AND FOLLOW THIS SAFETY INFORMATION
CAREFULLY.
SAVE THESE INSTRUCTIONS
6

WARNING: Combustible
construction refers to
adjacent walls and ceilings
and should not be confused
with combustible or
flammable products and
materials. Combustible
and/or flammable products
and materials should never
be stored in the vicinity of
this or any gas appliance.
7
This water heater must be installed in accordance with these instructions, local codes, utility company
requirements, and/or in the absence of local codes, use the latest edition of the American National
Standard/National Fuel Gas Code. A copy can be purchased from either the American Gas Association,
400 North Capitol Street Northwest, Washington, DC 20001 as ANSI standard Z223.1 or National Fire
Protection Association, 1 Batterymarch Park, Quincy, MA 02269 as NFPA 54. In Canada, the latest
edition of the CSA B149.1 Natural Gas and Propane Installation, and the Canadian Electrical Code,
CSA C22.1 Part 1, in the absence of local codes.
Installing the water heater.
The water heater should not be located
in an area where leakage of the heat
exchanger or connections will result in
damage to the area adjacent to it or to
lower floors of the structure.
Whensuchareascannotbeavoideditis
recommended that a suitable catch pan,
adequately drained, must be installed
under the water heater.
The pan must not restrict combustion
air flow.
A gas fired water heater or any other
appliance should not be installed
in a space where liquids which give off
flammable vapors are to be used or stored.
Such liquids include gasoline, LP gas
(butane or propane), paint or adhesives and
their thinners, solvents or removers.
Because of natural air movement in a
room or other enclosed space, flammable
vapors can be carried some distance from
where their liquids are being used or
stored. The open flame of the water
heater's main burner can ignite these
vapors causing an explosion or fire which
may result in severe burns, death or
property damage.
The water heater must be located so it is
not subject to physical damage, for example,
by moving vehicles, area flooding, etc.
If the water heater is installed in a garage,
it should be installed so that the direct
ignition system and main burner are no
less than 18 inches above the garage floor.
Raising the gas fired water heater will
reduce BUT NOT eliminate the possibility
of lighting the vapor of any flammable
liquids which may be improperly stored or
accidentally spilled.
Location
The water heater should be installed
with the proper venting materials and
termination suitable for Category III
venting.
Failure to install and properly venting
the water heater to the outdoors as
outlined in the Venting Section of this
manual can result in unsafe operation.
Long hot water lines should be insulated
to conserve water and energy.
The water heater and water lines should
be protected from exposure to freezing
temperatures.
install the water heater in
bathrooms, bedrooms, any occupied
rooms normally kept closed, or in
outdoor areas.
install the water heater in small,
poorly ventilated rooms, or in air tight
rooms with air-conditioning.
install water heater where
subject to vibrations.
install the water heater in
Recreational Vehicles, Mobile Homes,
Boats and other Watercrafts.
install the water heater near
vents for heating or cooling. A
minimum of 4 feet should be
maintained.
Minimum clearance from combustible
construction is 1/2 sides, 0 rear (with
support bracket); 12 from the bottom;
12 from the front of the water heater;
and 12 from the top (24 from front
and top is recommended for servicing
purposes). If the clearances stated on
the Instruction/Warning Label, located
on the front panel of the heater differ,
install the water heater according to the
clearances stated on the label.
Do not
Do not
Do not
Do not
Do not
The water heater should be installed as
close as practical to the vent termination
to minimize vent length and the number
of elbows required for venting.

NOTICE: The water heater
should not be installed near
an air supply containing
halogenated hydrocarbons.
Inspect Shipment
Inspect the water heater for possible damage. Check the markings on the rating plate of
the water heater to be certain the type of gas supplied corresponds to the water heater
requirements. Verify all included parts are present (see below).
8
Wood Serew x 4pcs Washer x 4pcs
Use&CareManual
Corrosive Atmospheres
Propellants from common spray cans
or gas leaks from A/C and refrigeration
equipment are highly corrosive after
passing through a flame.
The water heater warranty is voided
when failure of the heater is due to
operation in a corrosive atmosphere.
The air in beauty shops, dry cleaning
establishments, photo processing labs,
and storage areas for liquid and powdered
bleaches or swimming pool chemicals
often contain such halogenated
hydrocarbons.
An air supply containing halogenated
hydrocarbons may be safe to breathe,
but when it passes through a gas flame
corrosive elements are released that
will shorten the life of any gas burning
appliance.
Exposive screw 2pcs
Installing the water heater.
Proper operation of the water heater requires air for combustion and ventilation. Provisions for
combustion and ventilation air must comply with referenced codes and standards.
NOTICE: If the water heater is installed in
an unconfined space within a building of
conventional frame, masonry or metal
construction, infiltration air is normally
adequate for proper combustion and
ventilation. If the water heater is installed in
a confined space, provisions for combustion
and ventilation air must be made.
A confined space is one having a volume
of less than 50 cubic feet per 1000 Btuh of
the aggregate input of all appliances
within that space.
The air must be supplied through two
permanent openings of equal area. One
is to be located within 12 above the floor
and the other is to be located within 12
below the ceiling.
The minimum net free area of each opening
must not be less than one square inch per
1000 Btuh of the total input rating of all
the appliances in the enclosure (but not
less than 100 square inches), if each
opening communicates with other
unconfined areas inside the building.
Buildings of unusually tight construction
shall have the combustion and ventilation
air supplied from outdoors, or a freely
ventilated attic or crawl space.
Combustion and Ventilation Air
If air is supplied from outdoors, directly or
through vertical ducts, there must be two
openings located as specified above and
each must have a minimum net free area
of not less than one square inch per 4000
Btuh of the total input rating of all the
appliances in the enclosure.
If horizontal ducts are used to
communicate with the outdoors, each
opening must have a minimum net free
area of not less than one square inch per
2000 Btuh of the total input rating of all
the appliances in the enclosure. If ducts
are used, the minimum dimensions of
rectangular air ducts shall not be less than
3.
NOTICE: If the duct openings which supply
combustion and ventilation air are to be
covered with a protective screen or grill, the
net free area (openings in the material) of
the covering material must be used in
determining the size of the openings.
Protective screening for the openings MUST
NOT be smaller than 1/4 esh to prevent
clogging by lint or other debris.

IMPORTANT: Do not
apply heat to the HOT or
COLD water connections. If
sweat connections are used,
sweat tubing to adapter
before fitting adapter to the
water connections on
heater. Any heat applied to
the water supply fittings
will permanently damage
the internal components of
the water heater.
Water Supply Connections
CAUTION: This water
heater must only be used
with the following water
supply system conditions:
With clean, potable water
free of corrosive
chemicals, sand, dirt, or
other contaminates.
With inlet water
temperatures above 32 F,
but not exceeding 120 F.
Free of lime and scale
deposits.
DO NOT reverse the hot
and cold water
connections. The water
heater will not operate.
o
o
Plumbing should be carried out by a
qualified plumber in accordance with local
codes.
Use approved plumbing materials only.
All material between the water supply and
the water heater must be metal.
The diameter of the pipe lines should be a
minimum of 3/4 .
To conserve energy and to prevent
freezing, insulate both cold and hot water
supply lines. DO NOT cover the drain
valves.
To ensure proper operation of the water
heater, the following water pressure
guidelines should be followed:
Operation of the water heater requires
the minimum water pressure of 14 psi
and a minimum water flow rate of
0.66 gpm.
Additional water pressure is required
for long pipe runs and outlet fitting(s)
water pressure drops.
To maintain proper performance, ensure
sufficient water supply pressure. The
Required Water Pressure = Min.
Operating Water Pressure (14 psi) +
Pipe Pressure Loss + Faucet and
Shower Pressure Loss + Safety Margin
(more than 5 psi).
To supply hot water to upper floors,
additional water pressure (0.44 psi/ft)
must be ensured. The measurement
should be calculated by the distance
between the water inlet of the water
heater (ground level) to the hot water
faucet (upper floor level).
Well water systems should be set at
a range of 50-60 psi.
When the water is supplied from a
water supply tank, the height of the
tank and the diameter of the pipes and
their relation to water pressure, should
be taken into consideration.
.
If the water flow resistance of
a shower head is too high, the burner
in the water heater will fail to ignite.
Keep the shower head clean from
debris that could cause additional
pressure drop.
If using mixing valves on the
outlet, choose one which prevents cold
water pressure from overcoming hot
water line pressure.
Gravity
water pressure is not recommended
Notice:
Notice:
CAUTION:
Reinforcement of the wall is
required in case the wall is
not strong enough to hold
the appliance.
Mounting the Water Heater
9
Make sure the location of the appliance
allows for easy access and operation.
Wall studs should be utilized when
mounting the water heater to the wall.
In case of dry wall or concrete wall use
dry wall anchors or lag bolts.
The water heater requires 120VAC/60Hz.
Have a receptacle with ground terminal
near the water heater. The length of the
power supply cord is 10 feet.
Install a wood screw for the upper bracket
with a clearance of 1/8 between the wall
and the screw head. Hang the center of the
upper bracket on the screw.
Using a wood screw and a washer, affix
the lower bracket to the wall (Left and
Right). Repeat to affix the top bracket.
The brackets can be adjusted to change
the distance between the back of the
appliance and the wall within the range of
3/8 to 1 1/2
Loosen the adjustment screws of both the
top and the bottom brackets to adjust the
distance. (See diagram below)

A new pressure relief valve, complying
with the Standard for Relief Valves and
Automatic Gas Shut-Off Devices for Hot
Water Supply Systems, ANSI Z21.22,
must be installed at the hot water outlet
connection of the water heater at the
time of installation. Local codes shall
govern the installation of relief valves.
Forsafeoperationofthewaterheater,be
sure that:
The pressure rating of the relief valve
must not exceed 150 psi, the maximum
working pressure of the water heater as
marked on the rating plate.
The BTUH rating of the relief valve
must equal or exceed the BTUH input
of the water heater as marked on its
rating plate.
No valve of any type should be
installed between the relief valve and
the water heater
Discharge from the relief valve should
be piped to a suitable drain to eliminate
potential water damage. Piping used
should be of a type approved for the
distribution of hot water.
Hot and cold water lines should be
insulateduptothewaterheater.Refer
The discharge line must be NO
SMALLER than the outlet of the valve
andmustpitchdownwardtoallow
complete drainage (by gravity) of the
relief valve and discharge line.
The end of the discharge line should not
be threaded or concealed and should be
protected from freezing. No valve of
any type, restriction or reducer coupling
should be installed in the discharge line.
: Local codes govern the
installation of relief valves. If local codes
require that a temperature and pressure
relief valve should be installed the
manufacturer recommends a type 40XL
Watts T&P relief valve or an equivalent
model be used.
:Manualoperationofreliefvalves
should be performed at least once a year.
Turn off the electrical power and gas
shutoff valve. Lift and release lever on the
relief valve and check the manual
operation of the relief valve. You should
take precaution to avoid contact with the
hot water coming out of the relief valve
and to prevent water damage.
: If the relief valve on the system
discharges periodically, a problem exists
and service to the water system is
required.
Notice
Notice
Notice
Relief Valve
Notice: The above illustrates a
pressure only relief valve. If local
codes require a combination
temperature and pressure relief
valve be installed, an extension
piece may be needed.
Install a Check Valve between the water
heater and the water shutoff valve. (See
illustration the top left).
The following should be addressed in
regards to the HOT WATER OUTLET:
Connections between the water heater
and point(s) of use should be as short
and direct as possible.
DO NOT use lead or plastic pipe.
To conserve energy and minimize heat
loss, insulation of hot water piping is
recommended.
: The flow rate of hot water may
vary when more than two faucets
(appliances, fixtures, etc.) are being used
simultaneously.
: The pipes MUST be completely
drainable. If the hot water faucets are
located at a point higher than the water
heater, place a drain valve at the lowest
point (see diagram to the left).
Notice
Notice
10
Install a shutoff valve near the inlet of the
water heater for service and draining
purposes.
DO NOT use pipes with smaller diameters
than the water supply connection of the
water heater.
Before connecting the water supply pipe
to the water heater, open the shutoff valve
and clean out sand, debris, air, caulking
material, etc. inside the pipe. Connect to
the water inlet, then check water flow.
Close the shutoff valve and clean the
water filter.
Be sure to connect the water inlet and the
hot water outlet as shown on the water
heater. If reversed, the water heater will
not function.
Installation of unions or flexible copper
connections are recommended on the
HOT and COLD water lines, so that the
water heater may disconnect easily for
servicing if necessary.
Water Supply Connections Continued.
Installing the water heater.
Pressure
Relief
Valve Discharge
line
(To Suitable Drain)
6AirGap
Cold Water
Supply Line
Shut-off
Valve
Hot Water
Supply
Outlet
F
ON/OFF
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ErrorCodeErrorCode