Paloma PTG-74X User manual

AP13592 (06/04)
FOR YOUR SAFETY!
—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.
—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, to 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 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.
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.
!
!
Use & Care Manual
With Installation Instructions for the Installer
Printed in Japan
Tankless Water Heater
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Warning: This water heater is not suitable
for use in manufactured (mobile) homes!
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31-51482
Residential Outdoor Gas 199,900 BTU Max Input

Safety Information
Safety Precautions . . . . . . . 3–6
LP Gas Models . . . . . . . . . . . 5
Installation Instructions
Location . . . . . . . . . . . . . . . . . 7
Water Connections. . . . . . 9-10
Gas Supply . . . . . . . . . . . . . . 11
High Altitude . . . . . . . . . . . . 11
Venting . . . . . . . . . . . . . . . . . 12
Remote Control. . . . . . . . 13-14
Electrical Connection . . . . . . 15
Typical Installation . . . . . . . . 16
Pipe Insulation . . . . . . . . . . . 17
Installation Checklist . . . . . . 18
Operating Instructions
Lighting Instructions . . . . . . 19
Water Temperature. . . . . 20, 21
Care and Cleaning
Maintenance. . . . . . . . . . . . . 22
Housekeeping . . . . . . . . 22, 23
Vent Inspection . . . . . . . . . . . 23
Burner Inspection . . . . . . . . 23
Extended Shut-Down . . . . . . 23
Draining . . . . . . . . . . . . . . . . 24
Troubleshooting Tips
Before You Call
For Service . . . . . . . . . . . 25,26
Customer Service
Parts List . . . . . . . . . . . . . . . 27
If You Need Service . . . . . . . 28
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
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
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 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.
3
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!
PROPERLY INSTALL 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 anywhere 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.
WARNING!
DANGER
FLAMMABLES
Flammable Vapors
Water heater has a main
burner flame.
The main burner flame:
1. which can come on
at any time and
2. will ignite flammable
vapors.
Vapors:
1. cannot be seen,
2. are heavier than air,
3. go a long way on the
floor and
4. can be carried from
other rooms to the
main burner flame by
air currents.
Vapors from flammable
liquids will explode and
catch fire causing death or
severe burns.
Do not use or store flammable
products such as gasoline,
solvents or adhesives in the
same room or area near the
water heater.
Keep flammable products:
1. far away from heater,
2. in approved containers,
3. tightly closed and
4. out of children's reach.
Installation:
Do not install water heater
where flammable products will
be stored or used unless the
main burner flame is at least
18" above the floor. This will
reduce, but not eliminate, the
risk of vapors being ignited
by the main burner flame.
Read and follow water heater warnings and instructions. If
owners manual is missing, contact the retailer or manufacturer.

Time/Temperature Relationship in Scalds
Water Temperature Time To Produce a Serious Burn
120°F More than 5 minutes
125°F 11/2to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 11/2seconds
155°F 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. or
lower temperature setting to prevent contact with
“HOT” water.
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.
(See page 20 & 21 for more details.)
The temperature of the water at the outlet of the
water heater can be regulated by setting the
temperature on Remote Control. The remote control
was set at 100°F before it was shipped from the
factory.
The illustration to the bottom left illustrates the
Remote Control 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.
Notice: The factory setting allows operating
temperatures between 100°F and 120°F.
Temperatures of up to 140°F can be achieved with
the MAIN (UMC-117) (sold separately) remote
control and a dip switch adjustment. Contact the
dealer, distributor, or Rheem to purchase the MAIN
(UMC-117) remote control. Only qualified service
personnel should perform this adjustment. Only
factory authorized remote control(s) should be used.
DANGER
!
HOT
Water temperature over 125°F can
cause severe burns instantly or
death from scalds.
Children, disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.
BURN
DANGER!
WATER TEMPERATURE SETTING
!
Safety and energy conservation are factors to be considered when selecting the water
temperature setting of a water heater’s remote control. Water temperatures above 125°F
can cause severe burns or death from scalding. Be sure to read and follow the warnings
outlined on the label pictured below.
4
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
!
°F
PRIORITY
POWER
ON/OFF
100 102 104 106 108 110 112 114 116 118 120 130* 140* °F
Higher (Hotter) Lower (Cooler)
*Requires the optional MAIN (UMC-117) remote control (Sold Separately).
Tepid Hot Hotter Hottest

5
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.
DANGER!
NATURAL GAS AND LIQUEFIED PETROLEUM MODELS
●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; 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
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
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.
Notice: 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.

6
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
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, 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.
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 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.
Location
This water heater is for OUTDOOR
installation ONLY!
This water heater is an outdoor model
and must be mounted on a vertical wall.
It must not be installed indoors or in a
confined space. The water heater should
be installed close to the mose frequently
used outlet and its position chosen with
safety and service in mind.
Make sure people (particular children,
disabled, and elderly) will not touch the
hot water outlet or the flue terminal.
The flue terminal and air inlet must be
clear of obstruction and shrubbery.
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.
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.
● The water heater must be installed
vertically with the water, gas, and
power connections on the underside,
pointing toward the ground.
● Failure to properly install the water
heater outdoors as outlined in this
manual can result in unsafe operation.
●Hot and cold 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 water heater where
subject to vibrations.
●Do not install the water heater in
Recreational Vehicles, Mobile Homes,
Boats and other Watercrafts.
●Do not 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.
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.
!
min.
1/2 "
min.
1/2 "
min. 12"
(24" minimum is
recommended for service)
Top = 12"
Front = 12"
Back = 0" (with support bracket)
Side = 1/2"
Bottom = 12"
Minimum Clearance
from
Combustible Construction

8
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.
Combustion and Ventilation Air
This water heater is for OUTDOOR
installation ONLY.
It must NOT be installed indoors or in a
confined space.
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 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).
Manual Appliance
Gas Shut-off Valve
Use & Care Manual
Wood Screw x 5pcs. Washer x 4 pcs.
TanklessUnit
FORYOUR SAFETY!
—Do not store or use gasoline or other
flammable vapors or liquids or other
combustiblematerials in the vicinity of this or
anyother appliance. To do so may resultin an
explosionor fire.
—WHATTO DO IF YOU SMELLGAS
●Donot try to light any appliance.
● Donot touch any electrical switch; do not
useany phone in your building.
● Immediatelycall your gas supplier from a
neighbor’sphone. Follow the gas
supplier’sinstructions.
● Ifyou cannot reach your gas supplier, call
thefire department.
● Donot return to your home until authorized
bythe gas supplier or fire department.
—Improper installation, adjustment,
alteration,service or maintenance can cause
propertydamage, personal injury, or death .
Referto this manual. Installation and s ervice
mustbe performed by a qualified installer,
serviceagency or the gas supplier.
!
WARNING: If the information in these instructions is not followed exactly,
afire or explosion may result causing property damage, personal injury or death.
!
Thepurpose of this manual is twofold: one, to provide the installer with
thebasic directions and recommendations for the proper installation and
adjustment of the water heater; and two, to the owner–operator, to
explain the features, operation, safety precautions, maintenance and
troubleshootingof the water heater. This manual also includes a parts
list.
Itis 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
theseinstructions or any terms within it, seek professional advice.
Any questions regarding the operation, maintenance, service or
warrantyof this water heater should be directed to the seller from whom
it was purchased. If additional information is required, refer to the
sectionon How to Obtain Service Assistance.
Donot destroy this manual. Please read carefully and keep in a safe
placefor future reference.
Recognize this symbol as an indication of Important Safety
Information!
California Proposition 65 Warning: This product contains
chemicalsknown to the State of California to cause cancer, birth
defectsor other reproductive harm.
!
!
Use & Care Manual
WithInstallation Instructions for the Installer
Printedin USA
Water Heaters
Residential Gas
Warning:This water heater is not suitable for
usein manufactured (mobile) homes!
Tankless
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PRIORITY
POWER
ON/OFF
Remote Control
Assembly Kit

9
Water Supply Connections
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.
Mounting the Water Heater
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.
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 1½”.
Loosen the adjustment screws of both the
top and the bottom brackets to adjust the
distance. (See diagram below)
Bracket
Bracket
Adjustment Screws
Adjustment Screws
TOP
BOTTOM
Upper Bracket Wood Screw
Washer
Wood Screw
Washer
Washer
Wood Screw Lower Bracket
1/8"
Clearance
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 or
pressure 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. Gravity
water pressure is not recommended.
Notice: 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.
Notice: If using mixing valves on the
outlet, choose one which prevents cold
water pressure from overcoming hot water
line pressure.
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.
CAUTION:
Reinforcement of the wall is
required in case the wall is
not strong enough to hold
the appliance.

10
Installing the water heater.
Relief Valve
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.
For safe operation of the water heater, 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
insulated up to the water heater. Refer
to page 17 for details.
●The discharge line must be NO
SMALLER than the outlet of the valve
and must pitch downward 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.
Notice: 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.
Notice: Manual operation of relief valves
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.
Notice: If the relief valve on the system
discharges periodically, a problem exists
and service to the water system is
required.
Water Supply Connections Continued.
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.
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. (See Hot and Cold Pipe
Insulation Installation on page 17).
Notice: The flow rate of hot water may
vary when more than two faucets
(appliances, fixtures, etc.) are being used
simultaneously.
Notice: 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).
Water Filter
Check Valve
Water Inlet
Clean the
Water Filter
Water
Nipple
Air
Relief
Val v e
Hot
Water
Tap
Drain Valve
Union
Pressure
Relief Valve
Water
Shutoff
Valve
Cold
Water
Supply
Inlet
Hot Water
Supply
Outlet
Relief
Valve
Discharge
Line
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. (Refer to
page 16 for example of extension
piece for T&P relief valve
installation.)

11
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 gas shut-off valve(s) to
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 should also be
leak tested after the water heater is placed
in operation.
High Altitude
Ratings of gas appliances are based on
sea level operation and need not be
changed for installations at elevations up
to 3,280 feet.
NOTICE: For installations above 3,280
feet, the connector on the PC board
must be replaced for High Altitude
installations. Please contact your local
distributor, dealer, or Rheem for
replacement connector.
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 the 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.).
Gas Supply
It is recommended that a Manual Gas
Appliance Shutoff Valve be installed at the
gas connection of the water heater at the
time of installation (see diagram to the
left).
The branch gas supply line to the water
heater should be clean 3/4” 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. The
National Fuel Gas Code (NFGC)
mandates a manual gas shut-off valve: See
(NFGC) for complete instructions.
If flexible connectors are used, the
maximum length shall not exceed 36”.
If lever type gas shut offs are used, they
shall be T-Handle type.
Compound used on the threaded joints of
the gas piping must be of the type
resistant to the action of LP gas. Use
compound sparingly on male threads only.
A sediment trap should be installed at the
bottom of the gas line.
Do not use excessive force (over 31.5 ft
lbs.) in tightening the pipe, particularly if
teflon pipe compound is used, as the unit
may be damaged.
The inlet gas pressure to the water heater
must not exceed 10.5” w.c. for natural or
14” wc 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.
WARNING: Never use
an open flame to test for
gas leaks, as property
damage, personal injury, or
death could result.
Manual Gas
Appliance
Shut-off
(Supplied)
Sediment
Trap
Manual
Gas
Supply
Line
Shut-off
Val v e
Union
Cap
WARNING: Install a
gas pressure regulator, in
the gas supply line, which
does not exceed the
maximum supply pressure.
DO NOT use an industrial
type gas regulator.

12
Installing the water heater.
Flue Terminal Location
The location of the vent terminal depends on the following
minimum clearances and considerations (see illustration):
Twelve (12) inches above grade level and above normal
snow levels.
Four (4) feet below, or four (4) feet horizontally from any
door, window, soffit, under eave vent or gravity air inlet to
the building or other appliances, or from gas or electric
meters. Do not locate vent above walkways, doors,
windows, air inlets, gas or electric meters or other
equipment.
Ten (10) feet from any forced air inlet to the building.
Any fresh or make-up air inlet such as for a dryer or
furnace area is considered to be a forced air inlet.
Eighteen (18) inches from an inside corner formed by two
exterior walls.
4' 4'
Soffit vents
18"
4'
4'
4'
18"
Electric
meter
Inside
corner
10'
Fresh
air
intake
12" (Above grade/snow level)
window or vent
Additional Considerations
Do Not install the water heater under any patio or deck.
To help prevent moisture from freezing on walls and under
eaves, do not locate vent terminal on the side of a building
with prevailing winter winds.
Do Not locate vent terminal too close to shrubbery, as flue
gasses may damage them.
Caulk all cracks, seams and joints within six (6) feet of vent
terminal.
All painted surfaces should be primed to lessen the chance of
physical damage. Painted surfaces will require maintenance.
If soffit vent is too close,
block off and install new
vent at another location
Inside
corner
Caulk
Caulk
Caulk
6' caulk
zone or
to edge of
window etc., starting
within 6'
Rising moisture will collect under eaves
4'
6' caulk
zone
6'
WARNING: Moisture in the flue gas will condense as it
leaves the vent terminal. In cold weather this condensate can
freeze on the exterior wall, under the eaves and on
surrounding objects. Some discoloration to the exterior of
the building is to be expected. However, improper location
or installation can result in severe damage to the structure
or exterior finish of the building

13
Remote Control Installation
One (1) remote control is provided with
the water heater. Additional remote
controls may be purchased separately. Up
to three (3) remote controls can be used
with this water heater.
The following are considerations for
determining the location of the remote
control(s):
●●DO NOT install any remote control
outdoors.
●●
Place remote control(s) out of children’s
reach.
●●
The remote control(s) can be installed in
convenient locations such as the kitchen,
laundry room, utility room, or directly beside
the water heater.
●●
The included remote control can be placed in
a convenient location in a bathroom,
however, AVOID areas where water may
come into contact with the control(s).
●●Avoid areas where the remote control(s)
may be exposed to heat, e.g. stove
ranges or heaters.
●●Avoid areas where the remote control(s)
may be subjected to oil and/or steam
from cooking.
●●Avoid areas where chemical agents
(such as thinner, benzine and alkaline)
are used.
●●Avoid areas of direct sunlight.
●●The MAXIMUM distance between the
water heater and the remote control(s)
installation location is limited to 195
feet.
NOTICE: Only one of each type of
remote controls can connect to the
water heater. Therefore, a maximum of
three controls can connect to the water
heater.
No other manufacturer’s controls are
suitable for use with this water heater.
DO NOT attempt to disassemble the
remote control.
WARNING: Field wiring connections and electrical grounding must comply with local
codes, or in the absence of local codes, with the latest edition of the National Electrical Code,
ANSI/NFPA 70, or in Canada, Canadian Electrical Code, CSA C22.1 Part 1.
°F
PRIORITY
POWER
ON/OFF
Remote
Control
Base Plate
Foam Packing
(with Adhesive Paper)
Control screw
Mounting Screw x 2
Remote Control
Model Number
Remote Control
Description
Temperature
Set Point Range Availability
USC1-117 BATH1 100°F - 120°F Provided
USC2-117 BATH2 100°F - 120°F Optional
(Sold separately)
UMC-117 MAIN 100°F - 140°F Optional
(Sold separately)
NOTICE: The provided
remote control will allow a
maximum temperature
setting of 120°F. If higher
temperatures (up to 140°F)
is desired, a MAIN
(UMC-117) remote control is
available (sold separately).
Contact your dealer for
details.

14
Installing the water heater.
WARNING: Field wiring connections and electrical grounding must comply with local
codes, or in the absence of local codes, with the latest edition of the National Electrical Code,
ANSI/NFPA 70, or in Canada, Canadian Electrical Code, CSA C22.1 Part 1.
Remote Control
Connection Terminals
Gas Valve
PCB
18 AWG
Extension
Cable
Clamp
NOTICE: Extension cable
can be any Type-T 18 AWG
wire similar to a thermostat
wire and is not polarity
sensitive.
Do Not apply sealant to the
remote control cable.
It is not recommended to
have wiring exposed.
Remote Control Installation Continued...
Connecting BATH1 (supplied) and/or
BATH2 (sold separately) remote control to
the water heater:
●●Drill a 1” to 1.5” hole at the proposed
control location.
●●Install the extension cable between the
location of the remote control and the
water heater.
●●Remove the base plate from the control.
●●Peel off one side of the adhesive paper
from the foam packing and adhere to
the back face of the base plate (This is
the side without the projections).
●●Peel off the remaining adhesive paper
from the foam packing.
●●Draw the remote control extension
cable through the central in the base
plate.
●●Fix the base plate to the wall using
suitable screws and wall anchors.
Ensure the projections on the base plate
are pointing upwards.
●●Connect the remote control cables to
the extension cable from the water
heater.
●●Place the remote control over the base
plate. Ensure the projections in the
base plate fit into the housings in the
remote control(s).
●●Fix the control to the base plate at the
bottom of the remote control using the
screw provided.
●●Proceed to “Connection the remote
control to the water heater” section to
complete installation.
Connecting the remote control(s) to the
water heater:
●●Ensure that the power to the water
heater has been disconnected.
●●Remove the front cover of the water
heater.
●●Insert the remote control extension
cable through the hole at the bottom
right hand corner of the water heater.
●●Connect the wires to the terminals on
the top right hand side of the Printed
Circuit Board (PCB) as shown in
illustration to the left.
NOTICE: The remote control wire
connection terminals are not polarity
sensitive.
●●Firmly tighten the terminal screws.
●●Secure the remote control extension
cable using the appropriate clamp.
●●Replace the front cover of the water
heater.
●●Switch on the power supply to the
water heater.
●●Ensure proper operation of the remote
control(s) and water heater.
Notice: The BATH controls can be
connected in parallel as described
above, or in series by attaching the
extension cable(s) to the terminals on
the back of the MAIN remote control.
Remote
Control
Projections
Suitable
Wall Anchors
Adhesive
Paper
Foam
Packing
Base Plate
Screws
Control
Screw
Control
Cable
Extension Cable
Wall
Penetration

15
Electrical Connection
HARDWIRING THE ELECTRICAL
CONNECTIONS:
●Wiring should be carried out by a
qualified electrician in accordance with
local codes.
●The water heater requires 120 VAC/60Hz
and should be properly grounded.
●DO NOT connect grounding wire to
water pipes, gas pipes, telephone
cables, lightning conductor circuits and
to grounding circuit of other equipment
that carry a ground-fault interrupter.
●An ON/OFF switch must be provided
and installed for the incoming
120VAC power.
●Wire the water heater exactly as shown
below. A wiring diagram is also found
inside of the cover panel.
●A green screw is provided in the
junction box for grounding connection.
●Connect the live wire to black leg wire
and the neutral wire to the white neutral
wire.
WARNING: Shock
hazard line voltage is
present. Before servicing
the water heater, turn off
the electrical power to the
water heater at the main
disconnect or circuit
breaker. Failure to do so
could result in severe
personal injury or death.
CAUTION: Label all
wires prior to
disconnection when
servicing controls. Wiring
errors can cause improper
and dangerous operation.
Verify correct operation
after servicing.
B
8
RGRY B O W BR
AIR
INTAKE
FILTER
SWITCH
TRANSFORMER
GND
BK
GND
WAT E R
FLOW
SENSOR
OVER HEAT
LIMITER
BK:BLACK
COLOUR CODE
BR:BROWN
R:RED
W:WHITE
B:BLUE
GY:GRAY
GR:GREEN
O:ORANGE
Y:YELLOW
G/Y:GREEN/YELLOW
REMOTE REMOTE REMOTE
(UMC-117)
(USC1-117)
(USC2-117)
FAN
MOTOR
FM
5
WIRING DIAGRAM
FUSE(3A)
CIRCUIT
BOARD
SV3 SV2
SV1
SV0
W
B
R
O
Y
W
W
CONNECTOR FOR CHECKING
THERMOELECTROMOTIVE FORCE
FUSE
(5A)
2
1
U
2
1
O
S
1
3
2
B
R
GR
Y
B
O
W
R1
BR
R2
R3R4
GR
GR
GY
GY
W
Y
R
R
R
BR BY
W
R
W
W
R
W
BK
BK
BK
BK
BK
BK BK BK BK BK BK
BK BK
W
BK
IGNITER
ELECTRODE
W
1
2
3
4
5
6
7
1
2
1
2
8
1234
Q
P
R
1
2
3
4
5
6
1
2
3
4
5
6
7
OFF
ON
1
234
I
J
H
F
DE
B
A
PSV
M
L
-+
K
G
T
CONTROL MOTOR
WATER VOLUME
LIMITER
MOTOR
SW2 SW1
SW3
R
R
G/Y BK
W
AC
100V
G/Y
W
AC
120V
FOR INDOOR
MODEL ONLY
1
4
5
63
2
36
5
2
1
4
IG
WV
B
DIP SWITCH
ADJUSTER
BUTTON
MIN
BUTTON MAX
BUTTON
MAIN
WATER BY-PASS
SOLENOID VALVE
V
A
L
V
E
3
S
O
L
E
N
O
I
D
V
A
L
V
E
2
S
O
L
E
N
O
I
D
V
A
L
V
E
1
S
O
L
E
N
O
I
D
V
A
L
V
E
0
S
O
L
E
N
O
I
D
G
A
S
I
N
L
E
T
T
H
E
R
M
I
S
T
O
R
A
I
R
A
M
B
I
E
N
T
T
H
E
R
M
I
S
T
O
R
I
N
L
E
T
W
A
T
E
R
T
H
E
R
M
I
S
T
O
R
E
X
C
H
A
N
G
E
R
H
E
A
T
T
H
E
R
M
I
S
T
O
R
H
O
T
W
A
T
E
R
O
U
T
L
E
T
V
A
L
V
E
FROST
PROTECTION
THERMOSTAT
WW
W
W
W
BK
BK
BK
BK
BK
WW
W
W
W
BK
FOR INDOOR
MODEL ONLY
ANTI-FROST
HEATER
T
H
E
R
M
O
C
O
U
P
L
E
(BLUE)
(RED)
(RED)
R W
CONTROL
BATH BATH
CONTROL1
CONTROL2
LED
FLAME ROD1
FLAME ROD2
FLAME ROD3
THE CONNECTORS OF DUAL AND MULTIPLE
ARE INTERAPPLICABLE TO THE BODY
CONNECTORS EACH OTHER.(RED)
On/Off
Switch
Junction
Box
Ground Screw
Wire
Connections
WARNING: Field wiring connections and electrical grounding must comply with local
codes, or in the absence of local codes, with the latest edition of the National Electrical Code,
ANSI/NFPA 70, or in Canada, Canadian Electrical Code, CSA C22.1 Part 1.

16
Installing the water heater.
Typical Installation
To Hot Water
Faucet(s)
Air Relief
Valve
Discharge
Line
(To Suitable Drain)
Pressure
Relief
Valve
Union
Drain Valve
6" Air Gap
Manual Gas
Appliance
Shut-off
(supplied)
Sediment
Trap
Manual
Gas Supply Line
Shut-off
Valve
Union
Cap
Cold Water
Supply
Shut-off
Valve
Check
Valve
°F
PRIORITY
POWER
ON/OFF
Remote
Control
(Must be installed
INDOORS)
On/Off
Switch
Flue
Terminal
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.

17
For increased energy efficiency, use pipe
insulation. Please install the insulation,
according to the illustrations above,
making sure to insulate all the way to the
top. Do not cover any drain or pressure
valve(s).
Do’s
❑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 &
Care Manual and the National Fuel Gas
Code (CAN/CGA B149 in Canada).
❑Do maintain proper clearances to
combustibles as specified on the nameplate.
❑Do ensure that the flue terminal location
complies with the guidelines found in the
Use & Care Manual and National Fuel Gas
Code (CAN/CGA B149 in Canada).
Don’ts
❑Don’t block or restrict Air Intake
Opening located bottom of the water heater.
❑Don’t remove the front cover unless
absolutely necessary. This should only be
done after being examined by a qualified
service technician.
❑Don’t install this product where standing
water may occur.
During Installation of this water heater...........
Hot and Cold Pipe Insulation Installation
Gas Inle
t
Check Valve
Inlet Pipe
Cold Water
Hot
Water
Insulate all the
way to the top
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 does not store water 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.
WARNING: If local
codes require external
application of insulation
blanket kits the
manufacturer’s instructions
included with the kit must
be carefully followed.
NOTICE: The hot and cold
pipes should be insulated as
shown to provide additional
freeze protection.

Installing the water heater.
18
A Water Heater Location
❑Installed OUTDOORS.
❑Close to area of mostly used outlet.
❑Protected from freezing temperatures.
❑Proper clearance from combustible surfaces
observed.
❑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 heater and vent
piping.
❑Water heater is properly attached to the wall.
B. Water Supply
❑Water supply has sufficient pressure.
❑Air purged from water heater and piping.
❑Water connections tight and free of leaks
❑Water filter is clean and in place.
❑Materials used are as instructed in this manual.
❑Water pipes are insulated.
C. Gas Supply
❑Gas type matches rating plate.
❑Gas supply pressure is sufficient for the water
heater.
❑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).
D. Relief Valve
❑Pressure Relief Valve properly installed and
discharge line run to open drain
❑Discharge line protected from freezing.
E. Electrical Wiring
❑Voltage matches rating plate.
❑Water heater is properly grounded.
❑Wiring meets all local codes.
❑Water heater is hardwired.
Installation Check List

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.
WARNING : If you do not follow these instructions exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
FOR YOUR SAFETY READ BEFORE OPERATING
1.STOP! Read the safety information above on this label.
2.Turn off all electric power to the appliance.
3.Do not attempt to light the burner by hand.
4.Turn the Gas Shutoff Valve located on the outside of the unit
clockwise to the "OFF" position.
5.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow "B" in
the safety information above on this label. If you don't smell gas, go to the next step.
6.Turn the Gas Shutoff Valve located on the outside of the unit counterclockwise to
the "ON" position.
7.Turn on all electric power to the appliance.
8.If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance"
and call your service technician or gas supplier.
TO TURN OFF GAS TO APPLIANCE
1 . Turn off all electric power to the appliance if service is to be performed.
2 . Turn the Gas Shutoff Valve located on the outside of the unit clockwise to the "OFF" position.
GAS SHUTOFF
VALVE
OPEN CLOSE
OPERATING INSTRUCTIONS

20
Time/Temperature Relationship in Scalds
Water Temperature Time To Produce a Serious Burn
120°F More than 5 minutes
125°F 11/2to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 11/2seconds
155°F About 1 second
Table courtesy of Shriners Burn Institute
DANGER: There is a
hot water scald potential
if the temperature is set
too high. Households with
small children, disabled, or
elderly persons may require
a 120°F. or lower
temperature 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 on the front of the remote
control.
Safety factors should be considered when
selecting the water temperature setting of
the water heater’s temperature.
The remote control was set at 100°F
before the water heater was shipped from
the factory. This is the recommended
starting point.
Water temperatures above 125°F 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.
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.
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 water and gas
supplies are fully opened.
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 lights, to avoid vapors lighting.
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.