A.O. Smith 185874-001, FMV-50, FMV-40, FMV-30 User Manual
Instruction Manual
RESIDENTIAL GAS WATER HEATERS
FOR USE ONLY IN MANUFACTURED HOMES
GAMA ce rti fic ati on appl ies
to all residential gas water
heaters with capacities of 20
to 100 gallons with input rating
of 75,000 BTU/Hr. or less.
C3 Technology® Gas Water Heaters meet the new ANSI Z21.10.1
standard that deals with the accidental or unintended ignition of
ammable vapors, such as those emitted by gasoline.
• For Your Safety •
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
PRINTED 0807 185874-001
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
SAFE INSTALLATION, USE AND SERVICE
Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.
Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and
others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important
that the meaning of each safety message is understood by you and others who install, use or service this water heater.
This is the safety alert symbol. It is used to alert you
to potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible
injury or death.
DANGER indicates an imminently hazardous
DANGER
WARNING
CAUTION
situation which, if not avoided, could result
in death or injury.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result
in death or injury.
CAUTION indicates a potentially hazardous
situation which, if not avoided, may result
in minor or moderate injury.
CAUTION used without the safety alert
CAUTION
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message and
how to avoid the risk of injury.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances
known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of
potential exposure to such substances.
This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. This
appliance can cause low level exposure to some of the substances listed, including formaldehyde, carbon monoxide and soot.
symbol indicates a potentially hazardous
situation which, if not avoided, could result
in property damage.
IMPORTANT DEFINITIONS
• Qualied Installer: A qualied installer must have ability equivalent to a licensed tradesman in the elds of plumbing,
air supply, venting and gas supply, including a thorough understanding of the requirements of the National Fuel Gas
Code as it relates to the installation of gas red water heaters. The qualied installer must also be familiar with the
design features and have a thorough understanding of this instruction manual.
• Service Agency: A service agency also must have ability equivalent to a licensed tradesman in the elds of plumbing,
air supply, venting and gas supply, including a thorough understanding of the requirements of the National Fuel Gas
Code as it relates to the installation of gas red water heaters. The service agency must also have a thorough
understanding of this instruction manual, and be able to perform repairs strictly in accordance with the service guidelines
provided by the manufacturer.
• Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning
appliances within this application. The gas supplier typically has responsibility for the inspection and code approval of
gas piping up to and including the Natural Gas meter or Propane storage tank of a building. Many gas suppliers also
offer service and inspection of appliances within the building.
2
GENERAL SAFETY
3
TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE............................2
GENERAL SAFETY..................................................................3
TABLE OF CONTENTS ............................................................4
INTRODUCTION ......................................................................4
Preparing for the New Installation .....................................4
TYPICAL INSTALLATIONS .................................................. 5-6
LOCATING THE NEW WATER HEATER .................................7
Facts to Consider
Insulation Blankets ............................................................8
INSTALLING THE NEW WATER HEATER ........................ 9-18
Securing W
& P Valve and Pipe Insulation ........................................9
T
ater Piping ............................................................... 9-10
W
ater Piping Pressure Test.............................................10
W
emperature Pressure Relief Valve ...........................10-11
T
Filling the W
enting ...................................................................... 12-13
V
Gas Piping ................................................................ 13-14
Sediment
White-Rodgers Fuel Conversion Instructions
from Natural Gas to Propane (L.P
White Rodgers Fuel Conversion Instructions
from Propane (L.P
Traps ...............................................................14
About Location ................................. 7-8
ater Heater to Floor and Wall .........................9
ater Heater .............................................11-12
.) Gas ................... 14-16
.) to Natural Gas .................................16
RobertShaw Fuel Conversion Instructions
from Propane (L.P
RobertShaw Fuel Conversion Instructions
from Natural Gas to Propane (L.P
WHITE-RODGERS GAS VALVE ............................................19
ROBERTSHAW GAS VALVE .................................................20
INSTATLLATION CHECKLIST ...............................................21
TEMPERATURE REGULATION ............................................22
FOR YOUR INFORMATION ............................................. 23-24
Start Up Conditions .........................................................23
Operational Conditions ............................................. 23-24
PERIODIC MAINTENANCE ............................................. 25-27
V
enting System Inspection..............................................25
Burner Inspection ............................................................25
Burner Cleaning ..............................................................25
Housekeeping .................................................................25
Anode Rod Inspection.....................................................26
T
emperature-Pressure Relief Valve Operation ...............26
Draining..................................................................... 26-27
Drain V
Service ............................................................................27
LEAKAGE CHECKPOINTS ....................................................28
REPAIR PARTS ................................................................ 29-30
TROUBLESHOOTING GUIDELINES .....................................31
WARRANTY ......................................................................Insert
alve Washer Replacement ..................................27
.) to Natural Gas ........................... 16-18
.) Gas .........................18
INTRODUCTION
Thank You for purchasing this water heater. Properly installed and
maintained, it should give you years of trouble free service.
Abbreviations Found In This Instruction Manual:
CSA - Canadian Standards Association
•
• ANSI - American National Standards Institute
• NFPA - National Fire Protection Association
• ASME - American Society of Mechanical Engineers
• GAMA - Gas Appliance Manufacturer’s Association
This gas-red water heater is design certied by CSA INTERNATIONAL
under American National Standard/CSA Standard for Gas Water
Heaters for Manufactured Home Installation, ANSI Z21.10.1 • CSA
4.1 (current edition).
PREPARING FOR THE INSTALLATION
1. Read the “General Safety” section, page 3 of this manual rst and
then the entire manual carefully. If you don’t follow the safety rules,
the water heater will not operate properly. It could cause DEATH,
SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE.
This manual contains instructions for the installation, operation, and
maintenance of the gas-red water heater. It also contains warnings
throughout the manual that you must read and be aware of. All warnings
and all instructions are essential to the proper operation of the water
heater and your safety. Since we cannot put everything on the rst
few pages, R
TO INSTALL OR OPERATE THE WATER HEATER.
2. Instructions to Manufactured Home Manufacturers:
The installation must conform with the Manufactured Home
Construction and Safety Standards Title 24 CFR, Part 3280.
EAD THE ENTIRE MANUAL BEFORE ATTEMPTING
Instruction for replacement installation:
T
he installation must conform with these instructions and the local
code authority having jurisdiction. In the absence of local codes,
installations shall comply with the National Fuel Gas Code ANSI
Z223.1/NFPA 54, current edition. This publication is available from
the Canadian Standards Association, 8501 East Pleasant Valley Rd.,
Cleveland Ohio 44131, or The National Fire Protection Association,
1 Batterymarch Park, Quincy, MA 02269.
3.
If after reading this manual you have any questions or do not
understand any portion of the instructions, call the local gas utility
or the manufacturer whose name appears on the rating plate.
Carefully plan the place where you are going to put the water
4.
heater. Correct combustion, vent action, and vent pipe installation
are very important in preventing death from possible carbon
monoxide poisoning and res, see Figures 1 and 2.
Examine
the “Locating the New Water Heater” section in this manual.
5.
For California installation this water heater must be braced,
anchored, or strapped to avoid falling or moving during an
earthquake. See instructions for correct installation procedures.
Instructions may be obtained from California Ofce of the State
Architect, 400 P Street, Sacramento, CA 95814.
Massachusetts Code requires this water heater to be installed in
6.
accordance with Massachusetts 248-CMR 2.00: State Plumbing
Code and 248-CMR 5.00.
Complies with SCAQMD rule #1121 and districts having equivalent
7.
NOx requirements.
4
the location to ensure the water heater complies with
GET TO KNOW YOUR WATER HEATER - GAS MODELS
A Vent Pipe
B Drafthood
C Anode
D Hot Water Outlet
E Outlet
F Roof Jack
G Gas Supply
H Manual Gas Shut-off Valve
I Ground Joint Union
* INSTALL IN ACCORDANCE
WITH LOCAL CODES.
* DRIP LEG AS REQUIRED
BY LOCAL CODES.
VENT TERMINATION
OF ROOF JACK
TYPICAL INSTALLATIONS
J Drip Leg (Sediment Trap)
K Inner Door
L Outer door
M Union
N Inlet Water Shut-off Valve
O Cold Water Inlet
P Inlet Dip Tube/Nipple
Q Temperature-Pressure Relief Valve
R Rating Plate
WHITE-RODGERS ROBERTSHAW
S Flue Bafe
T Thermostat
U Drain Valve
V Pilot and Main Burner
W Flue
X Drain Pan
Y Thermostat Shield (optional)
Z Air Intake Screen
* ALL PIPING MATERIALS TO BE
SUPPLIED BY CUSTOMERS.
* 50 gallon unit has top connections and
no side connection as shown here.
VACUUM
RELIEF
VALVE
INSTALL PER
LOCAL CODES
FIGURE 1.
5
Y
THERMOSTAT
SHIELD
(OPTIONAL)
INSTALL THERMAL EXPANSION
TANK OR DEVICE IF WATER
HEATER IS INSTALLED IN A
CLOSED WATER SYSTEM.
(V) PILOT & MAIN BURNER
TYPICAL INSTALLATIONS
INSTALLATION IN ENCLOSURE OF MANUFACTURED
HOME WITH LOUVERED EXTERIOR DOOR
* MIXING VALVE USAGE
FIGURE 2.
This appliance has been design certied as complying with American
National Standard/CSA Standard for water heaters and is considered
suitable for:
Wa
ter (Potable) Heating: All models are considered suitable for
water (potable) heating.
INSTALLATION IN ENCLOSURE OF MANUFACTURED
HOME WITH SOLID EXTERIOR DOOR
HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated to
a temperature which will satisfy space heating, clothes washing,
dish washing, and other sanitizing needs can scald and permanently
injure you upon contact. Some people are more likely to be
permanently injured by hot water than others. These include the
elderly, children, the inrm, or physically/mentally handicapped. If
anyone using hot water in your home ts into one of these groups or
if there is a local code or state law requiring a certain temperature
water at the hot water tap, then you must take special precautions.
In addition to using the lowest possible temperature setting that
satises your hot water needs, a means such as a *Mixing Valve,
should be used at the hot water taps used by these people or at
the water heater. Mixing valves are available at plumbing supply or
hardware stores. Consult a Qualied Installer or Service Agency.
Follow mixing valve manufacturer’s instructions for installation of
the valves. Before changing the factory setting on the thermostat,
read the “Temperature Regulation” section in this manual, see
Figures 29 and 30.
6
LOCATING THE NEW WATER HEATER
FACTS TO CONSIDER ABOUT THE LOCATION
This manufactured home gas-red water heater is for use in a
manufactured home. You should carefully choose an indoor location
for the new water heater, because the placement is a very important
consideration for the safety of the occupants in the building and for
the most economical use of the appliance. This water heater is
for use only in manufactured homes and is not intended for
outdoor installation.
The installation of this water heater must be within an enclosure
so as to separate the appliance combustion system and venting
system from the interior atmosphere of the manufactured home.
There shall not be any door, removable access panel, or other
opening into the enclosure from the inside of the manufactured
home.
Whether replacing an old water heater or putting the water heater in
a new location, the following critical points must be observed.
1. An enclosure with an exterior access door incorporating a single
opening positioned a maximum of 6 inches above the lower edge
of the access door and which may incorporate either 1/4 inch wire
mesh or louvers. When 1/4 inch wire mesh is used, the size of
the opening must be a minimum of 20 square inches. When the
louvers are used, the free area must be a minimum of 20 square
inches, see Figure 2 page 6.
2. An optional enclosure incorporating a solid exterior access door,
when a 5 inch or 8 inch diameter, or 20 square inch minimum
equivalent free air opening is located in the oor of the enclosure.
The opening must be covered by a 1/4 inch wire mesh, see Figure
2 page 6.
such locations cannot be avoided, a suitable drain pan should be
installed under the water heater. Drain pans are available at your
local hardware store. Such a drain pan must have a minimum length
and width of at least 2 inches (51 mm) greater that the water heater
dimensions and must be piped to an adequate drain. The pan must
not restrict combustion air ow.
Water heater life depends upon water quality, water pressure and
the environment in which the water heater is installed. Water heaters
are sometimes installed in locations where leakage may result in
property damage, even with the use of a drain pan piped to a drain.
However, unanticipated damage can be reduced or prevented by
a leak detector or water shut-off device used in conjunction with a
piped drain pan. These devices are available from some plumbing
supply wholesalers and retailers, and detect and react to leakage
in various ways:
• S
ensors mounted in the drain pan that trigger an alarm or turn off the
incoming water to the water heater when leakage is detected.
• Sensors mounted in the drain pan that turn off the water supply
to the entire home when water is detected in the drain pan.
• Water supply shut-off devices that activate based on the water
pressure differential between the cold water and hot water pipes
connected to the water heater.
• Devices that will turn off the gas supply to a gas water heater
while at the same time shutting off its water supply.
Install water heater into closet so as to have 0 inches minimum
clearance at sides and back. Clearance of 4 inches is needed to
front to accommodate the gas control valve, see Figure 3. Be sure
to allow adequate clearance for servicing the water heater and for
access to the piping and temperature-pressure relief valve.
The water heater should be secured to the oor and to the wall of the
enclosure with the mounting brackets provided. For bracket location
refer to “Securing Water Heater to Floor and Wall” in the “Installing
the New Water Heater” section.
When a manufactured home is skirted, an air intake opening with a
minimum free area of 32 square inches must be provided in the skirt.
Other gas red appliances in the home will require additional free air
openings; consult these manufacturers for correct sizing.
If the opening is covered by louvers or screen, the total free area
must be 32 square inches.
Installation of the water heater must be accomplished in such a
manner that if the tank or any connections should leak, the ow
will not cause damage to the structure. For this reason, it is not
advisable to install the water heater in an attic or upper oor. When
INSTALLATIONS IN AREAS WHERE FLAMMABLE LIQUIDS
(VA P O RS) ARE LIK E LY TO BE PRESEN T OR ST O RED
(GARAGES, STORAGE AND UTILITY AREAS, ETC.): Flammable
liquids (such as gasoline, solvents, propane [LP or butane, etc.] and
other substances such as adhesives, etc.) emit ammable vapors
which can be ignited by a gas water heater’s pilot light or main burner.
The resulting ashback and re can cause death or serious burns to
anyone in the area. Even though this water heater is a ammable
vapors ignition resistant water heater and is designed to reduce
the chances of ammable vapors being ignited, gasoline and other
ammable substances should never be stored or used in the same
vicinity or area containing a gas water heater or other open ame
or spark producing appliance.
7
Also, the water heater must be located and/or protected so it is not
subject to physical damage by a moving vehicle.
This water heater must not be installed directly on carpeting.
Carpeting must be protected by metal or wood panel beneath the
appliance extending beyond the full width and depth of the appliance
by at least 3 inches (76.2 mm) in any direction, or if the appliance is
installed in an alcove or closet, the entire oor must be covered by
the panel. Failure to heed this warning may result in a re hazard.
A gas water heater cannot operate properly without the correct
amount of air for combustion. Do not install in a conned area
such as a closet, unless you provide air as shown in the Typical
Installations, see Figure 2 page 6. Never obstruct the ow of
ventilation air. If you have any doubts or questions at all, call your
gas supplier. Failure to provide the proper amount of combustion
air can result in a re or explosion and cause death, serious bodily
injury, or property damage.
If this water heater will be used in beauty shops, barber shops,
cleaning establishments, or self-service laundries with dry cleaning
equipment, it is imperative that the water heater or water heaters
be installed so that combustion and ventilation air be taken from
outside these areas.
Propellants of aerosol sprays and volatile compounds, (cleaners,
chlorine based chemicals, refrigerants, etc.) in addition to being
highly ammable in many cases, will also change to corrosive
hydrochloric acid when exposed to the combustion products of
the water heater. The results can be hazardous, and also cause
product failure.
INSULATION BLANKETS
Insulation blankets are available to the general public for external
use on gas water heaters but are not necessary with these products.
The purpose of an insulation blanket is to reduce the standby heat
loss encountered with storage tank heaters. Your 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.
FIGURE 3.
Minimum clearances between the water heater and combustible and
noncombustible construction are 0” at the sides and rear, 4” at the
front, and 6” from the vent pipe. Clearance from the top of the draft
hood is 12”. Refer to the label on the water heater located adjacent
to the gas control valve for all clearances.
Should you choose to apply an insulation blanket to this heater, you
should follow these instructions (For identication of components
mentioned below, see Figure 1). Failure to follow these instructions
can restrict the air ow required for proper combustion, potentially
resulting in re, asphyxiation, serious personal injury or death.
• Do not apply insulation to the top of the water heater, as this will
interfere with safe operation of the draft hood.
Do not cover the outer door, thermostat or temperature & pressure
•
relief valve.
Do not allow insulation to come within 2” (50.8 mm) of the oor to
•
prevent blockage of combustion air ow to the burner
• Do not cover the instruction manual. Keep it on the side of the
water heater or nearby for future reference.
Do obtain new warning and instruction labels from the manufacturer
•
for placement on the blanket directly over the existing labels.
Do inspect the insulation blanket frequently to make certain it
•
does not sag, thereby obstructing combustion air ow
8
.
.
INSTALLING THE NEW WATER HEATER
SECURING WATER HEATER TO FLOOR AND WALL
The water heater must be secured to the oor and to the wall of the
enclosure with the three mounting brackets and screws packaged
in the carton with the water heater. The two small brackets stamped
#0110064 are used to attach the water heater to the oor and the
one large bracket #0110063 is used to secure the top of the water
heater to the wall.
Because of installation variances these brackets can be located at
any points around the circumference of the jacket. When the bracket
locations are determined using the 1/8 inch drill bit for a pattern, drill
only through the outer jacket of the water heater. Then using the
screws provided, secure the bracket to the water heater, oor and
wall, see Figure 4. If the heater is installed in a drain pan, seal the
drilled holes and screws with a heavy bead of silicone sealant to
prevent any potential water damage.
FIGURE 4.
WATER PIPING
HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated to
a temperature which will satisfy space heating, clothes washing,
dish washing, cleaning and other sanitizing needs can scald and
permanently injure you upon contact. Some people are more likely
to be permanently injured by hot water than others. These include
the elderly, children, the inrm, or physically/mentally handicapped.
If anyone using hot water in your home ts into one of these groups
or if there is a local code or state law requiring a certain temperature
water at the hot water tap, then you must take special precautions. In
addition to using the lowest possible temperature setting that satises
your hot water needs, a means such as a *mixing valve, should be
used at the hot water taps used by these people or at the water
heater, see Figure 2. Valves for reducing point of use temperature
by mixing cold and hot water are also available:
Consult a Qualied Installer or Service Agency. Follow manufacturer’s
instructions for installation of the valves. Before changing the factory
setting on the thermostat, read the “Temperature Regulation” section
in this manual.
T&P VALVE AND PIPE INSULATION
Remove insulation for T&P Valve and pipe connections from carton.
Fit pipe insulation over the hot water line. Make sure that the
insulation is against the top cover of the heater.
Fit T&P Valve insulation over valve. Make sure that the insulation
does not interfere with the lever of the T&P valve.
Secure all insulation using tape.
This water heater shall not be connected to any heating systems or
component(s) used with a non-potable water heating appliance.
Toxic chemicals, such as those used for boiler treatment shall not
be introduced into this system.
Water supply systems may, because of such events as high line
pressure, frequent cut-offs, the effects of water hammer among
others, have installed devices such as pressure reducing valves,
check valves, back ow preventers, etc. to control these types of
problems. When these devices are not equipped with an internal
by-pass, and no other measures are taken, the devices cause the
water system to be closed. As water is heated, it expands (thermal
expansion) and closed systems do not allow for the expansion of
heated water.
9
The water within the water heater tank expands as it is heated and
increases the pressure of the water system. If the relieving point of the
water heater’s temperature-pressure relief valve is reached, the valve
will relieve the excess pressure. T
valve is not intended for the constant relief of thermal expansion.
This is an unacceptable condition and must be corrected.
It is recommended that any devices installed which could create a
closed system have a by-pass and/or the system have an expansion
tank to relieve the pressure built by thermal expansion in the water
system. Expansion tanks are available for ordering through a local
plumbing contractor. Contact the local water supplier and/or a service
agency for assistance in controlling these situations.
he temperature-pressure relief
WATER PIPING PRESSURE TEST
NOTE
water ttings, it is strongly recommended that di-electric unions
or couplings be installed on this water heater when connected
to copper pipe.
protect against untimely corrosion of hot and cold
: To
This section is only for the manufacturer installing the water heater
when the installation is to comply with H.U.D. Standards.
When testing the water ways, H.U.D. Standards state:
“Water distribution system. All water piping in the water distribution
system shall be subjected to a pressure test. The test shall be made by
subjecting the system to air or water at 100 psi for 15 minutes without
loss of pressure. When air pressure is used, the water heater shall
not be connected during the test”.
NOTE: If water piping system is to be air pressure tested, the water
heater must be disconnected from the water piping system. Failure
to disconnect the water heater during air pressure testing of water
piping system could result IN DEATH, SERIOUS BODILY INJURY,
OR PROPERTY DAMAGE.
FIGURE 5.
Figure 5 shows the typical attachment of the water piping to the
water heater. The water heater is equipped with 3/4 inch NPT water
connections.
N
OTE: If using copper tubing, solder tubing to an adapter before
attaching
solder the cold water supply line directly to the cold water inlet.
It will harm the dip tube and damage the tank.
the adapter to the cold water inlet connection. Do not
FIGURE 6.
TEMPERATURE-PRESSURE RELIEF VALVE
10
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