Rheem Residential 40 Gallon User manual

AP14380 -1 (07/08)
!
FOR YOUR SAFETY!
— Do not store or use gasoline or other
flammable vapors and liquids or other
combustible materials in the vicinity of this or
any other appliance. To do so may result in an
explosion or fire.
— WHAT TO DO IF YOU SMELL GAS
● Do not try to light any appliance.
● Do not touch any electrical switch; do not
use any phone in your building.
● 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.
WARNING: If the information in these instructions is not followed exactly,
a fire or explosion may result causing property damage, personal injury or death.
!
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, for the owner–
operator, to explain the features, operation, safety precautions, maintenance and troubleshooting of the
water heater. This manual also includes a parts list.
It is very important 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 do not
understand these instructions or any terms within it, seek professional assistance.
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.
!
Recognize this symbol as an indication of Important Safety Information!
!
California Proposition 65 Warning: This product contains chemicals known to the State of
California to cause cancer, birth defects or other reproductive harm.
Residential 40 and 50 Gallon
Use & Care Manual
With Installation Instructions for the Installer
Printed in USA
Direct Vent Water Heaters
Residential Gas - FVIR Certified
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Warning: This water heater is not
suitable for use in manufactured (mobile) homes!
CERTIFIED
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!

Care and Cleaning
Draining ................ 22
Maintenance............. 22
Burner Inspection ........ 23
Extended Shut-Down ......23
Safety Information
Safety Precautions ....... 3–6
LP Gas Models ........... 5
Installation Instructions
Location ................. 7
Venting ............... 9-12
Water Supply Connections . . 13
Gas Supply.............. 14
Pipe Insulation ............16
Heat Traps ...............16
Installation Checklist.......17
Potable/Space Heating .... 18
Operating Instructions
Lighting Instructions ...... 19
Water Temperature .... 20, 21
Troubleshooting Tips
Before You Call
For Service........... 24, 25
Customer Service
Parts List................ 26
If You Need
Service ..........Back Cover
FOR YOUR RECORDS
Write the model and serial numbers here:
#
#
You can find them on a label on the appliance.
Staple sales slip or cancelled check here.
Proof of the original purchase date is needed to obtain service under
the warranty.
2
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 THIS MANUAL
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:
!
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.
Notice: Attention is called to observe a
specified procedure or maintain
a specific condition.
READ THE SAFETY INFORMATION

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 cost. 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 install the venting system and properly vent the water heater to the outdoors as
outlined in the Venting Section of 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 properly vented and
has an adequate air supply for proper operation. Be sure to inspect the vent system
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 vent system
inspection.
DANGER!
INSTALL THE VENTING SYSTEM AND PROPERLY VENT
THE WATER HEATER…
Gasoline, as well as other flammable materials and liquids (which include, but not limited
to 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 anywhere near or in the vicinity of a water heater and its vent pipe terminal or
any other appliance. Be sure to read and follow warning label pictured below and other
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.
WARNING!
!
!
FLAMMABLES
Flammable Vapors
FIRE AND EXPLOSION HAZARD
Can result in serious injury or death.
Do not store or use gasoline or other flammable vapors and liquids
in the vicinity of this or any other appliance. Storage of or use of gasoline
or other flammable vapors or liquids in the vicinity of this or any other
appliance can result in serious injury or death.
WARNING
3

Time/Temperature Relationship in Scalds
Water Temperature Time To Produce a Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 11/2to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 11/2seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
The chart shown above may be used as a guide
in determining the proper water temperature for your
home.
DANGER: Households with small children, disabled,
or elderly persons may require a 120°F (49°C) or lower gas
control (thermostat) setting to prevent contact with “HOT”
water.
Maximum water temperatures occur just after the
burner has shut off. To find water temperature being
delivered, turn on a hot water faucet and place
a thermometer in the water stream and read the
thermometer. (See page 20 and 21 for more details.)
The temperature of the water in the heater can be
regulated by setting the temperature dial on the front
of the gas control (thermostat). To comply with
safety regulations the gas control (thermostat) was
set at its lowest setting
before the water heater
was shipped from the
factory.
The illustration at the left
details the approximate
water temperature
for each mark on
the Gas Control
(Thermostat)
Temperature Dial.
!
DANGER: Hotter water increases the potential for
Hot Water SCALDS.
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DANGER!
WATER TEMPERATURE SETTING
Safety and energy conservation are factors to be considered when selecting the water
temperature setting of a water heater’s gas control. Water temperatures above 125°F
(52°C) can cause severe burns or death from scalding. Be sure to read and follow the
warnings outlined on the label pictured below. This label is also located on the water
heater.
Notice: Mixing valves are available for reducing point
of use water temperature by mixing hot and cold water
in branch water lines. Contact a licensed plumber or the
local plumbing authority for further information.
4
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
!
100°F
(38°C)
90°F
(32°C)
80°F
(27°C)
110°F
(43°C) 120°F
(49°C)
130°F
(54°C)
140°F
(60°C)
150°F
(66°C)
160°F
(71°C)
Temperatures are approximate

5
●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
fire, do not connect the water heater to a
fuel type not in accordance with the unit
data plate. LP for LP units. 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.
●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
at a connection indicates a leak that must
be corrected. When smelling to detect a
gas leak, be sure to sniff near the floor
also.
●Gas detectors are recommended in LP
& 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.
!
DANGER: If a gas leak is present or
suspected:
●Do not attempt to find the cause
yourself.
●Do not try to light any appliance.
●Do not touch any electrical switch.
●Do not 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.
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.
DANGER!
LIQUEFIED PETROLEUM (LP PROPANE OR BUTANE)
AND NATURAL GAS MODELS

6
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.
FOR INSTALLATIONS IN THE STATE OF CALIFORNIA
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, 1102 Q Street,
Suite 5100, 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, consult the local building jurisdiction for acceptable
bracing procedures.
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.
●Do not attempt to repair or replace any part
of your water heater unless it is specifically
recommended in this manual. All other
servicing should be referred to a qualified
technician.
SAFETY PRECAUTIONS
READ AND FOLLOW THIS SAFETY INFORMATION
CAREFULLY.
SAVE THESE INSTRUCTIONS

Installing the water heater.
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 N. Capitol Street NW, Washington, DC 20001 as ANSI standard Z223.1 or National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269 as booklet NFPA 54. For Canada Installations
use CAN/CSA B149 - Natural Gas and Propane Installation Code. A copy can be purchased from the
Canadian Standards Association, 178 Rexdale Boulevard,Toronto, Ontario, CANADA, M9W 1R3.
Location
The water heater should not be located
in an area where leakage from the tank
or connections will result in damage
to the area adjacent to the heater or to
lower floors of the structure.
When such areas cannot be avoided it is
recommended that a suitable catch pan,
adequately drained, must be installed
under the water heater.
Catch pan kits are available from the store
where the water heater was purchased, or
any water heater distributor.
Make certain that the floor underneath the
water heater is strong enough to support
the weight of the water heater once it is
filled with water.
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 liquids which give off flammable
vapors are to be used or stored. The open
flame of the water heater’s pilot or main
burner can ignite these vapors.
Rheem Water Heating FVIR certified gas
water heaters can be installed on a residential
garage floor without the use of an 18-inch
stand in accordance with the National Fuel
Gas Code, NFPA 54, ANSI Z223.1 2006,
paragraph 9.1.10 Installation in Residential
Garages, unless otherwise directed by State
and Local code requirements. The water
heater must be located so it is not subject to
physical damage, for example, by moving
vehicles, area flooding, etc
●This water heater is of the direct vent
design. It therefore must be located next
to the outside wall, within the range of
the telescopic adjustments. (See page 9
for Locating Clearance Hole for Vent)
●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.
●Do not install the water heater in
unprotected outdoor areas.
●Minimum clearance from combustible
construction is 0” sides, 0” rear; and 3”
(7.6 cm) from the front of the control. If
the clearances stated on the Instruction/
Warning Label, located on the front of
the heater differ, install the water heater
according to the clearances stated on
the label.
●The water heater may be installed on
combustible floors, but not directly on
carpeting. If the water heater must be
installed on carpeting, place a metal
or wood panel beneath the water
heater, extending beyond its full width
and depth at least 3” (7.6 cm) in all
directions.
●If the water heater is installed in an
alcove or closet, the entire floor must
be covered by a wood or metal panel.
A minimum of 24” (61 cm) clearance
from the front and top should be
available for adequate inspection and
servicing.
7
!
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.
The auxiliary catch pan
installation MUST conform
to local codes.
Max. 2”
(5 cm)
Diameter of
water heater
plus 2” min.
(5 cm)

8
Installing the water heater.
Combustion and Ventilation Air
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 ventilation air must be
made.
All air for combustion and all products of
combustion are routed through the ducting
provided, directly from and to the outside
of the building.
NOTICE: If the duct openings which
supply 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”mesh
to prevent clogging by lint or other
debris.
Corrosive Atmospheres
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.
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.
NOTICE: The water heater
should not be installed near
an air supply containing
halogenated hydrocarbons.
Inspect Shipment
Inspect the water heater and the venting provided with 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.

HOT
9" Min. (23 cm)
Within 10 feet
(305 cm)
Any forced air inlet
into the building
18”Min
(46 cm)
36” Min.
(91 cm)
18”Min.
(46 cm)
12" Min. (30 cm) above grade
(Higher in areas of heavy snowfall.)
Vent Terminal must be located at least 12” (30.5 cm)
min. above grade level and above normal snow
levels. Higher in areas of heavy snowfall.
Vent Terminal must be located at least 9” (23 cm) from
windows, doors, or any other opening through which flue
gases could enter the building.
Vent Terminal must be located at least 36” (91 cm) above
any Forced Air Inlet into the building within
10’ (3 m) of the Vent Terminal. Any fresh or make-up
air inlet such as for a dryer or furnace area is
considered to be a forced air inlet.
Vent Terminal must be located at least 18” (46 cm) from
any overhang or building corner or other irregularity.
DO NOT locate the Vent Terminal under any deck or
patio structure.
"X"
Floor
Cut a clearance hole, approximately 6 1/4” (15.8 cm)
in diameter, through the exterior wall for the
6” (15.2 cm) diameter air tube.
Capacity "X"
40 Gallon 68-1/4" (173.3 cm)
50 Gallon 68" (172.7 cm)
Approximately
6 1/4" Diameter
(15.8 cm)
Locating Clearance Hole for Vent
Vent Termination Clearances
Inside
Corner
9
The water heater must be installed with the factory supplied venting system. The old venting system
(vent pipe, air intake pipe, vent cap, elbows etc.) must be replaced with the vent system supplied with
the new water heater.
Venting
CAUTION: If there are any
damaged parts, DO NOT install the
water heater. Report any damage to
your distributor or to the carrier.
NOTICE: The four fasteners that are
required to secure the vent cap to the
external wall are not provided. These
should be screw type (not nails) chosen
for the type of construction and obtained
locally
DANGER: Failure to
install the venting system
and properly vent the water
heater to the outdoors as
outlined in the Venting
section of this manual will
result in unsafe operation of
the water heater causing
bodily injury, explosion,
fire or death. To avoid the
risk of fire, explosion, or
asphyxiation from carbon
monoxide, NEVER operate
the water heater unless it is
properly vented and has
adequate air supply for
proper operation as
outlined in the Venting
section of this manual.
See the back page of this manual
for additional requirements for the
Commonwealth of Massachusetts.

10
Installing the Water Heater:
3" (7.6 cm) (90° Elbow (Steel)
6" (15.2 cm)
90° Elbow (Aluminum)
Installing 6” (15.2 cm) Diameter
Aluminum Elbow
Install the 6” (15.2 cm) aluminum elbow over the
3” (7.6 cm) steel elbow. Be certain both are pointed
in the desired direction with the 3" (7.6 cm) centered
inside the 6” (15.2 cm) inch elbow.
3" (7.6 cm) 90° Elbow (Steel)
Bend the brackets on the elbow as shown on left.
Place the 3” (7.6 cm) steel elbow on the water heater
flue pipe and press it firmly downward until fully
seated and pointed in the desired direction. After
installation of elbow, apply silicone sealant around
the outside of the pipe where the 3" (7.6 cm) elbow
comes in contact with the ue pipe . An improper
seal can cause product performance and nuisance
pilot outages.
Secure the 3" (7.6 cm) steel elbow to the top pan by
inserting two #8 x 3/8" long screws supplied through
the bent brackets.
Moving water heater to its final
location
Installing 3” (7.6 cm) Diameter Steel
Elbow
Move the water heater to its final installed location.
Make certain clearances from combustible materials
are observed.
‡Sheet Metal Screws
Leveling and attaching 6” (15.2 cm)
Diameter Aluminum Elbow
As an aid to leveling the 6” (15.2 cm) elbow,
temporarily place the 6” (15.2 cm) sliding tube onto
the elbow.
When leveled, drill a
1
/ 8 ” inch diameter hole through the
elbow into the collar at the front and back. Secure with the
two #8 sheet metal screws supplied.
Place the finishing collar on the 6” (15.2 cm) elbow, as it
will be positioned later.
‡
‡
Install end of elbow with
label to top plenum.
Top Plenum.
Finishing Collar
Top Plenum Top Pan
Elbow with brackets bent at 90°
Top Plenum
* Seal with silicone sealant.

11
H1
Outside
Wall
Vent Terminal Base (Outside)
Attaching the 6” (15.2 cm) Diameter
Main Tube
From the outside of the building, insert the
6” (15.2 cm) vent tube/base assembly through the
hole in the exterior wall and onto the 6” (15.2 cm)
elbow. Slide as needed into place. (H1).
An improper seal can cause product performance and
nuisance pilot outages.
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G1
G2
G3
Sheet Metal Screws &
Silicone Sealant
Vent Terminal Base (Outside)
Assembling the 6” (15.2 cm)
Diameter Vent Tube Assembly w/
vent terminal base.
Inspect the vent tube upon opening the kit to assure
two silicone sealing bands are included and
positioned at the sealing points.
Attach the outer 6” (15.2 cm) main tube to the vent
terminal base as shown on left.. (G1)
Drill a
1
/ 8 ” inch diameter hole through the tube and the
collar of the base. (G2)
Secure with a #8 sheet metal screw, supplied. Repeat
with a second hole and screw approximately 180°
from the first. (G3)
Placing 3" (7.6 cm) Diameter Main
Vent Tube through Exterior Wall
Inspect the vent tube upon opening the kit to assure
three silicone sealing bands are included and
positioned at the sealing points.
Install the 3" main vent tube onto the end of the 3"
inner elbow & seal with silicone band by folding the
band back over the seam of both tubes.
Extend the 3” (7.6 cm) tube assembly to its required
length. Be sure a minimum of 2 1/2" extends beyond
the outer wall. (F1)
Move high temperature silicone band to connecting
joints as shown. (F2)
F4
3" Tube
F1
F2
"X" Optional kit that provides additional adjustment up to 48" (121.9 cm) can be purchased seperately.
"X"
Gallons "X" Inches (cm)
40 9 1/8" (23.17 cm) -
19 1/8" (48.57 cm)
50 8 1/8" (20.63 cm)
- 18 1/8" (46 cm)
2 1/2" Minimum extension
beyond wall.

Installing the water heater.
Typical Installation
Heat Trap
6" Min (15.2 cm).
Vent Terminal Cap
(Outside)
Heat Trap
6" Min. (15.2 cm)
Hot Water
Outlet to
Fixtures
To Cold Water Supply
Temperature
and Pressure
Relief Valve
Relief Valve Discharge Line
to Suitable Open Drain
Expansion Tank
(if required)
Manual Gas Shut-Off
Shut-Off Valve
To Gas Supply
Ground Joint Union
Gas Control (Thermostat)
Jacket Door
Drain Valve
Auxiliary Catch Pan
Air Gap - 6" (15.2 cm)
Cap
Air Tube
Sediment Trap
Union
Anode Rod (Located under top pan) Not
accessible. Refer to Protection Plus Kit for
additional protection.
12
Catch Pan Pipe to suitable drain.
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J3
J1
J2
L5
L1
K
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Screw Anchors
Wall
Vent Terminal Base
3" Tube
(7.6 cm)
6" Tube
(15.2 cm)
Seal with Silicone Sealant
Vent Terminal Base (Outside)
Finishing Collar (Inside)
6
” (15.2 cm)
90° Elbow
(Aluminum)
Outside Wall
Vent Terminal
Cap (Outside)
✚✚✚
L2
L3
L2
L3
✚
✚ Sheet Metal Screws
▲Seal with Silicone Band
Securing Vent Cap / Base Assembly to
the Exterior Wall
Next place the 3” (7.6 cm) main tube fully onto the collar
of the vent cap. Then seat the cap against the base. (J1)
Secure the vent cap/base assembly to the exterior wall
with four screw anchors appropriate for the type of wall
construction. The 6” (15.2 cm) tube should be essentially
level. However, a small amount of upward pitch will not
affect operation. (J2)
Caulk the junctions of the vent terminal base and the
exterior wall with silicone sealant (Not Supplied). (J3)
An improper seal can cause product performance and
nuisance pilot outages.
Final Assembly and Sealing of the Vent
System
Position and fasten the finishing collar, previously
installed on the 6” (15.2 cm) elbow, against the wall to
close the opening around the tube. (K)
Make certain the 6” (15.2 cm) inner sliding air tube has
been fully engaged onto the 6" (15.2 cm) elbow.(L1)
Drill two 1/8” inch holes (180° apart) in the junction of
the two joints in the 6" (15.2 cm) tube. (L2)
Fasten with four #8 sheet metal screws supplied. (L3)
Using a flat head screw driver inserted through the holes
in the vent cap, roll the silicone band over the seam to
seal. (L4)
Seal all the 6” (15.2 cm) tube joints with the silicone
bands provided (L5). Seal the elbow joint to the plenum
using silicone sealant. Again, an improper seal can cause
product performance and nuisance pilot outages. (M)
NOTICE: The National
Fuel Gas Code (NFGC)
mandates a manual gas
shut-off valve: See (NFGC)
for complete instructions.
Local codes or plumbing
authority requirements may
vary from the instructions
or diagrams provided and
take precedent over these
instructions.
V a cuum Relief V a lve
(Not Supplied)
If required, install per local codes
and valve manufacturer’s
instructions.
6" Inner Sliding Tube
Top of
Plenum
✱Seal with Silicone Sealant
✱
L4
✱
▲
Union
▲

A new combination temperature and pressure relief valve, complying with the Standard for Relief Valves
and Automatic Gas Shut-Off Devices for Hot Water Supply Systems, ANSI Z21.22, is supplied and must
remain in the opening provided and marked for the purpose on the water heater. No valve of any type
should be installed between the relief valve and the tank. Local codes shall govern the installation of
relief valves.
Relief Valve
The pressure rating of the relief valve
must not exceed 150 PSI (1034 kPa), 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.
Position the outlet of the relief valve
above a suitable open drain to eliminate
potential water damage. Piping used
should be of a type approved for hot water
distribution.
The discharge line must be no smaller
than the outlet of the valve and must
pitch downward from the valve to allow
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.
13
Thermal Expansion
Determine if a check valve exists in the inlet water line. Check with your local water utility
company. It may have been installed in the cold water line as a separate back flow preventer, or
it may be part of a pressure reducing valve, water meter or water softener. A check valve located
in the cold water inlet line can cause what is referred to as a “closed water system”. A cold water
inlet line with no check valve or back flow prevention device is referred to as an “open” water
system.
As water is heated, it expands in volume and creates an increase in the pressure within the water
system. This action is referred to as “thermal expansion”. In an “open” water system, expanding
water which exceeds the capacity of the water heater flows back into the city main where the
pressure is easily dissipated.
A “closed water system”, however, prevents the expanding water from flowing back into the
main supply line, and the result of “thermal expansion” can create a rapid and dangerous
pressure increase in the water heater and system piping. This rapid pressure increase can quickly
reach the safety setting of the relief valve, causing it to operate during each heating cycle. Thermal
expansion, and the resulting rapid, and repeated expansion and contraction of components in the
water heater and piping system can cause premature failure of the relief valve, and possibly the
heater itself. Replacing the relief valve will not correct the problem!
The suggested method of controlling thermal expansion is to install an expansion tank in the
cold water line between the water heater and the check valve (see illustration on page 12). The
expansion tank is designed with an air cushion built in that compresses as the system pressure
increases, thereby relieving the over pressure condition and eliminating the repeated operation of
the relief valve. Other methods of controlling thermal expansion are also available. Contact your
installing contractor, water supplier or plumbing inspector for additional information regarding
this subject.
Refer to the illustration on page 12 for suggested typical installation. The installation
of unions or flexible copper connectors is recommended on the hot and cold water
connections so that the water heater may be easily disconnected for servicing if
necessary. The HOT and COLD water connections are clearly marked and are 3/4” NPT
on all models. Install a shut-off valve in the cold water line near the water heater.
Water Supply Connections
NOTICE: 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
dip tube, nipples and/or
heat traps.

Installing the water heater.
WARNING: Do not attempt to convert this water heater for use with a different type of gas other than the type
shown on the rating plate. Such conversion could result in hazardous operating conditions.
Leak Testing
The water heater and its gas connections
must be leak tested at normal operating
pressures before it is placed in operation.
Turn on the manual gas shut-off
valve near the water heater.
Use a soapy water solution to test for
leaks at all connections and fittings.
Bubbles indicate a gas leak that must
be corrected.
The factory connections to the gas
control (thermostat) should also be leak
tested after the water heater is placed in
operation.
Gas Supply
The branch gas supply line to the water
heater should be clean 1/2” black steel
pipe or other approved gas piping
material.
A ground joint union or ANSI design
certified semi-rigid or flexible gas
appliance connector should be installed
in the gas line close to the water heater.
A manual gas shut-off valve should be
at least 5 ft. (1.5 m) above the floor and
readily accessible.
Use compound sparingly on male threads
only. The compound used on threaded
joints of the gas piping must be of the type
resistant to the action of LP gas.
Where a sediment trap is not incorporated
as part of the appliance, a sediment trap
shall be installed downstream of the
equipment shutoff valve as close to the
inlet of the appliance as practical at the
time of the appliance installation. The
sediment trap shall be either a tee fitting
with a capped nipple in the bottom outlet
or other device recognized as an effective
sediment trap.
Do not use excessive force (over 31.5
ft lbs.) (42.7 Nm) in tightening the pipe
joint at the gas control (thermostat) inlet,
particularly if teflon pipe compound is
used, as the valve body may be damaged.
The inlet gas pressure to the water heater
must not exceed 10.5” w.c. (2.65 kPa) for
natural gas or 14" w.c. (3.5 kPa) for LP
gas. For purposes of input adjustment, the
minimum inlet gas pressure (with main
burner on) is shown on the water heater
rating plate. If high or low gas pressures
are present, contact your gas supplier for
correction.
● If flexible connectors are used, the
maximum length shall not exceed 36”
(91 cm).
●If lever type gas shut-offs are used,
they shall be T-Handle type.
WARNING: Never use
an open flame to test for
gas leaks, as property
damage, personal injury, or
death could result.
14
Condensation
Condensation can form on the tank
when it is first filled with water.
Condensation might also occur with a
heavy water draw and very cold inlet
water temperatures.
Drops of water falling on the burner can
produce a sizzling or pinging sound. The
water may also be seen beneath the water
heater.
This condition is not unusual, and will
disappear after the water becomes heated.
If, however, the condensation continues,
examine the piping and fittings for
possible leaks.
To Fill the Water Heater
Make certain that the drain valve is
closed, then open the shut-off valve in the
cold water supply line.
Open each hot water faucet slowly to
allow the air to vent from the water
heater and piping.
A steady flow of water from the hot water
faucet(s) indicates a full water heater.
WARNING: The tank
must be full of water before
heater is turned on. The
water heater warranty does
not cover damage or failure
resulting from operation
with an empty or partially
empty tank.
NOTICE: Additional
information on this subject
may be found at www.rheem.
com, under Rheem Water
Heating, "Support", scroll
down to the Technical Service
Section and to Bulletins 1400
Series Section and choose
Bulletin #1402.

15
Insulation Blankets
Insulation blankets, available to the
general public, for external use on gas
water heaters are not necessary. The
purpose of an insulation blanket is to
reduce the standby heat loss encountered
with storage tank heaters. This water
heater meets or exceeds the National
Appliance Energy Conservation Act
standards with respect to insulation and
standby loss requirements making an
insulation blanket unnecessary.
The manufacturer’s warranty does not
cover any damage or defect caused by
installation, attachment or use of
any type of energy saving or other
unapproved devices (other than those
authorized by the manufacturer) into, onto
or in conjunction with the water heater.
The use of unauthorized energy saving
devices may shorten the life of the water
heater and may endanger life and property.
The manufacturer disclaims any
responsibility for such loss or injury
resulting from the use of such
unauthorized devices.
CAUTION: If local codes require the
application of an external insulation
blanket to this water heater, pay careful
attention to the following so as not to
restrict the proper function and
operation of the water heater:
●Do not cover the operating or warning
labels attached to the water heater or
attempt to relocate them on the exterior
of insulation blanket.
Do not apply insulation to the top of the
water heater. as this will interfere with
the safe operation of the water heater
and venting system.
Do not cover the burner access door,
jacket door, gas control (thermostat)/gas
valve or pressure and temperature relief
valve.
WARNING: If local
codes require external
application of insulation
blanket kits the
manufacturer’s instructions
included with the kit must
be carefully followed.
High Altitude
Ratings of gas appliances are based
on sea level operation. This water heater
is suitable and certified for use at high
altitudes. Refer to the altitude label on
the water heater for maximum allowable
installation altitude Please contact your
local distributor or place of purchase for a
high altitude model.
WARNING: Failure to install a
water heater suitable for the altitude at
the location it is intended to serve, can
result in improper operation of the
appliance resulting in property damage
and/or, producing carbon monoxide
gas, which could result in personal
injury, or death.
Pressure Testing the Gas Supply System
The water heater and its manual gas
shut-off valve must be disconnected from
the gas supply piping system during any
pressure testing of that system at
pressures in excess of 1/2 psi (14” w.c.).
The water heater must be isolated from
the gas piping system by closing the
manual gas shut-off valve during any
pressure testing of the gas supply piping
at pressures equal to or less than
1/2 psi (14” w.c.).

16
For increased energy efficiency, some
water heaters have been supplied with
two 24” (60.9 cm) sections of pipe
insulation. Please install the insulation,
according to the illustrations above, that
best meets your requirements.
DO
❑DO check inlet gas pressure to ensure
that it is within the range specified on the
rating plate.
❑DO provide adequate air for combustion
and ventilation as discussed in the Use and
Care Manual and the National Fuel Gas
Code.
❑DO maintain proper clearances to
combustibles as specified on the instruction/
warning label.
❑DO ensure that the venting system
complies with the guidelines found in the
Use and Care Manual and National Fuel Gas
Code.
❑DO contact a qualified service technician
if the pilot or main burner will not stay lit.
DON’T
❑DON’T block or restrict the vent
terminal.
❑DON’T remove the Burner Access
Door unless absolutely necessary. This
should only be done by a qualified service
technician. A new burner access door gasket
must be installed on any burner access door
that has been removed.
❑ DON’T install this water heater where
standing water may occur. The base of the
water heater is meant to be mounted on a dry
surface.
❑DON’T operate the water heater if the
sight glass or burner access door grommet is
damaged or broken.
Typical vertical piping arrangement Typical horizontal piping arrangement
During Installation of this water heater...........
Heat Trap
Hot and Cold Pipe Insulation Installation
For increased energy efficiency, some
water heaters have been supplied with
factory installed 3/4” NPT heat traps in
the hot outlet line and cold water inlet
line.
NOTICE: 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 dip tube,
nipples, and/or heat traps.
Installing the water heater.

17
Installation Checklist
A. Water Heater Location
B. Water Supply
C. Gas Supply
D. Relief Valve
E. Venting
❑ Close to outside wall.
❑ Indoors and protected from freezing
temperatures.
❑ Proper clearance from combustible surfaces
observed and water heater not installed on
carpeted floor.
❑ Sufficient fresh air supply for proper
operation of water heater.
❑ Air supply free of corrosive elements and
flammable vapors.
❑ Provisions made to protect area from water
damage.
❑ Sufficient room to service heater.
❑ Combustible materials, such as clothing,
cleaning materials, rags, etc. clear of the base
of the heater.
❑ Water heater completely filled with water.
❑ Air purged from water heater and piping.
❑ Water connections tight and free of leaks.
❑ Gas line equipped with shut-off valve, union
and sediment trap.
❑ Approved pipe joint compound used.
❑ Soap and water solution used to check all
connections and fittings for possible gas
leak.
❑ Gas Company inspected installation
(if required).
❑ Temperature and Pressure Relief Valve
properly installed and discharge line run to
open drain.
❑ Discharge line protected from freezing.
❑ Flue baffle properly hung in top of heater’s
flue.
❑ Air tube and vent tube properly installed.
❑ Vent terminal, air tube sealed with silicone
bands and sealants.
❑ Air tube securely fastened with screws.

Tee fitting for vertical hot
water supply lines.
Hot water
supply to
house
From HOT
outlet on
water heater
Hot water
supply to
heating
unit
Supplemental instructions for gas water heaters installed
in potable/space heating applications.
Local codes or plumbing authority requirements may vary from the instructions or diagrams provided
in this manual and take precedent over these instructions.
Tee fitting for horizontal hot
water supply lines.
From HOT
outlet on
water heater
Hot water
supply to
house
Hot water supply
to heating unit
Combination Potable and Space Heating Application
Tee fitting must be installed as shown.
This ensures that any air in the water lines
will be purged through the domestic water
faucets and showers.
DANGER: When this system
requires water for space heating at
elevated temperatures [above 125°F
(52°C.)], a mixing or tempering valve
must be installed in the hot water
supply line to the house in order to
reduce the scald hazard potential.
DANGER: Any piping or components
used in the installation of this water
heater in a combination potable and
space heating application must be
suitable for use with drinking water.
DANGER:If this water heater is
installed in an application intended to
supply domestic hot water needs and
hot water for space heating purposes,
do not connect the heater to an existing
heating unit or components of a heating
system that have previously been used
with a non drinking water system. Toxic
chemicals such as those used for boiler
treatment may be present and will
contaminate the drinking water supply
causing possible health risks. Never
introduce toxic chemicals, such as those
used for boiler treatment, into this
system.
Notice: 50' - 0" maximum
distance from water heater to
fan coil (developed length) is
required for Massachusetts State.
18
Typical Piping Diagram for Combination Potable/Space Heating Installation
Spring loaded check valve in heating
unit hot water supply line and cold water
return line (not supplied with water
heater)
NOTE: This check valve is incorporated
in some heating units. Refer to the
installation instructions supplied with
specific heating unit to determine if it
is required.
All water piping shall be insulated
in accordance with Local and State
Energy Code.
Isolation valve in
cold water return
line from heating
unit (not supplied
with water heater)
Nominal 3/4" size mixing or tempering valve
(refer to warning above). Follow mixing or
tempering valve manufacturer’s instructions
for installation of the valve.
Temperature and pressure relief
valve discharge line
Air Handler
Drain valve
(not supplied with
water heater)
Hot water
to space heater
Temperature and Pressure Relief
Valve, tie to location approved by
local code
Isolation valve in hot water supply
line to heating unit (not supplied with
water heater)
3/4" cold water supply
3/4" Tempered
domestic hot water
supply to house.
Gas line to water heater
6” Air Gap
Combustion Air Inlet
Openings
2 Gallon Thermal
Expansion Tank
(if required-not
supplied with water
heater)
Air vent
Heat Trap
6” Min.
3/4" Shut-Off Valve (Typ.)
3/4" Check Valve with 1/8" Hole
Pressure Gauge
3/4" Shut-Off Valve (Typ.)
3/4"
Shut-Off
Valve
(Typ.)
Piping loop between water
heater and fan coil shall
be flow guard gold CPVC
or equal
Hot water coil
All bronze pump.
Check valve
internal in pump.
Air bleed valve.
Water Sample Tap.
TFAN
ON
OFF
HEAT
COOL
To HVAC
Unit.
Electronically controlled pump timer.
Activates every 6 hours for 60 seconds.
Wire to bronze pump.
3/4" HWS &
HWR to Heating
Coil.
Minimum of 2'-0" developed length
of 3/4" type "L" copper from the
water heater connection.
Water Heater drain pan installed
in accordance with the Local and
State Code
Water Heater to be in
accordance with the Local and
State Energy Code
Gas Fired
Water Heater
Gas Direct Vent
discharge must comply
with Local and State
Code
V a cuum Relief V a lve
(Not Supplied)
If required, install per local codes
and valve manufacturer’s
instructions.
120° to 130°
140°
18

19
Lighting the water heater.
Before operating this water heater, be sure to read and follow the instructions on the label pictured
below and all other labels on the water heater, as well as the warnings printed in this manual. Failure to
do so can result in unsafe operation of the water heater resulting in property damage, personal injury,
or death . Should you have any problems reading or following the instructions in this manual, STOP,
and get help from a qualified person.
instructions exactly, a re or explosion may result causing property damage,
personal injury or loss of life.
If you do not follow these instructions and the Use & Care Manual

20
Time/Temperature Relationship in Scalds
Water Temperature Time To Produce a Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 11/2to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 11/2seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
Safety Precautions
Do turn off manual gas shut-off valve if water heater
has been subjected to over heating, fire, flood,
physical damage or if the gas supply fails
to shut off.
Do Not turn on water heater unless it is completely
filled with water.
Do Not turn on water heater if cold water supply
shut-off valve is closed.
Do Not allow combustible materials such as
newspaper, rags or mops to accumulate near
water heater.
Do Not store or use gasoline or other flammable
vapors and liquids, such as adhesives or paint thinner,
in vicinity of this or any other appliance.
If such flammables must be used, open doors
and windows for ventilation, and all gas burning
appliances in the vicinity should be shut off including
their pilot burners, to avoid vapors igniting.
NOTICE: Flammable vapors can be drawn by air
currents from surrounding areas to the water heater.
If there is any difficulty in understanding or following
the Operating Instructions or the Care and Cleaning
section, it is recommended that a qualified person or
serviceman perform the work.
Operating the water heater.
CAUTION: Hydrogen gas can be produced in a hot water system served by this water heater that has not been used for a
long period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE!! To dissipate such
gas and to reduce risk of injury, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink
before using any electrical appliance connected to the hot water system. If hydrogen is present, there will be an unusual sound
such as air escaping through the pipe as the water begins to flow. Do not smoke or use an open flame near the faucet at the
time it is open.
!
DANGER: Hotter water
increases the Potential
for Hot Water SCALDS.
Households with small
children, disabled, or elderly
persons may require a 120°F
(49°C) or lower gas control
(thermostat) setting to
prevent contact with HOT
water.
Water Temperature Setting
The temperature of the water in the water
heater can be regulated by setting the
temperature dial on the front of the gas
control (thermostat).
Safety and energy conservation are factors
to be considered when selecting the water
temperature setting of the water heater’s
gas control (thermostat(s)). The lower the
temperature setting, the greater the savings
in energy and operating costs.
To comply with safety regulations, the gas
control (thermostat) was set at its lowest
setting before the water heater was shipped
from the factory. The recommended
starting point temperature is 120°F (49°C).
Water temperatures above 125°F (52° C)
can cause severe burns or death from
scalding. Be sure to read and follow the
warnings outlined in this manual and on
the label located on the water heater near
the gas control (thermostat).
Mixing valves are available for reducing
point of use water temperature by mixing
hot and cold water in branch water
lines. Contact a licensed plumber or
the local plumbing authority for further
information. (See page 4 for more details.)
The chart below may be used as a guide in
determining the proper water temperature
for your home.