Suburban SW12D User manual

INSTALLATION AND OPERATION MANUAL
DIRECT VENT
GAS WATER HEATER
DIRECT SPARK IGNITION (DSI)
MODELS
SW12D !SW12DE !SW12DEM
FOR INSTALLATION IN RECREATIONAL
VEHICLES AND MOBILE HOUSING
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
!DO NOT TRY TO LIGHT ANY APPLIANCE.
!DO NOT TOUCH ANY ELECTRIC SWITCH: DO NOT USE ANY PHONE IN YOUR
VEHICLE.
!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.
FREEZE WARNING
DRAIN HEATER IF SUBJECT TO FREEZING TEMPERATURES.
WARNING: IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR
MAINTENANCE CAN CAUSE INJURY OR PROPERTY DAMAGE. REFER TO THIS MANUAL.
FOR ASSISTANCE OR ADDITIONAL INFORMATION, CONSULT A QUALIFIED INSTALLER,
SERVICE AGENCY OR THE GAS SUPPLIER.
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER COMBUSTIBLE MATERIALS OR LIQUIDS
NEAR OR ADJACENT TO THIS HEATER OR ANY OTHER APPLIANCE. THIS APPLIANCE
SHALL NOT BE INSTALLED IN ANY LOCATION WHERE FLAMMABLE LIQUIDS OR VAPORS
ARE LIKELY TO BE PRESENT.
AN ODORANT IS ADDED TO THE GAS USED BY THIS WATER HEATER.
INSTALLER: AFFIX THESE INSTRUCTIONS TO OR ADJACENT TO WATER HEATER.
OWNER: RETAIN THESE INSTRUCTIONS AND WARRANTY FOR FUTURE REFERENCE.
ALL TECHNICAL AND WARRANTY QUESTIONS SHOULD BE DIRECTED TO THE COMPANY
LISTED ON THE WARRANTY, OR RATING PLATE WHICH CAME WITH YOUR WATER HEATER.
SUBURBAN MANUFACTURING COMPANY
Post Office Box 399
Dayton, Tennessee 37321
423-775-2131
Fax: [phone]
2
Figure 1A
Figure 1
INSTALLATION REQUIREMENTS
WARNING! Installation of this appliance must be m ade in accordance with
the written instructions provided in this manual. No agent, representative
or employee of Suburban or other person has the authority to change,
modify or waive any provision of the instructions contained in this
manual.
CAUTION: If possible, do not install the water heater to where the vent can
be covered or obstructed when any door on the trailer is opened. If this is
not possible, then the travel of the door must be restricted in order to
provide a 6" minimum clearance between the water heater vent and any door
whenever the door is opened.
CAUTION: Due to the differences in vinyl siding, this appliance should not
be installed on vinyl siding without first consulting with the manufacturer of
the siding or cutting the siding away from the area around the appliance
vent.
CAUTION: In any installation in which the vent of this appliance can be
covered due to the construction of the RV or some special feature of the RV
such as slide out, pop-up etc., always insure that the appliance cannot be
operated by setting the thermostat to the positive “OFF” position and
shutting off all electrical and gas supply to the appliance.
CAUTION: Do not install this appliance to where the vent terminates below
a slide-out. This appliance is not to be installed under any overhang. It must
be free and clear of any type overhang.
This installation must conform with the requirements of the authority having
jurisdiction or in the absence of such requirements with the latest edition of the
National Fuel Gas Code ANSI Z223.1; and the latest edition of the American
National Standard for Recreational Vehicles-501C. In Canada the installation
should conform with the following standards.
A. For installation in Recreational Vehicle
1. Gas - CSA standard CSA Z240.4.2 Installation Requirements for Propane
Appliances and Equipment in Recreations Vehicles.
2. Electrical - CSA standard C22.2 No. 148/Z240.6.2 Electrical Requirements
for Recreational Vehicles.
3. Plumbing - CSA standard CSA Z240.3.2 Plumbing Requirements for
Recreational Vehicles.
B. For installation in Mobile Housing
1. Gas - CSA standard CSA Z240.4.1 Installation Requirements for Gas
Burning Appliances and Equipment in Mobile Homes.
2. Electrical - CSA standard CSA C22.1 Canadian Electrical Code Part 1.
3. Plumbing - CSA standard CSA Z240.3.1 Plumbing Requirements for M obile
Homes.
The appliance shall be disconnected from the gas supply piping system during
any pressure testing of the system.
The appliance and its gas connections shall be leak tested before placing the
appliance in operation.
All air for combustion must be supplied from outside the structure. Air for
combustion must not be supplied from occupied spaces.
INSTALLATION INSTRUCTIONS
Minimum clearance from combustible construction on sides, top, floor and
rear = 0 inches. Provide room for access to rear of heater for servicing.
Provide an opening flush with floor in outer wall of coach as shown. Wall of coach
should be framed as shown in Figure 1. Maintain inside dimensions listed below.
Do not install on carpet unless the carpet is covered by a metal or wood shield
covering the entire area underneath the water heater. If you prefer, you may cut
away the carpet from this area.
INSTALLATION USING FLUSH MOUNT FRAME & DOOR
(See Figure 2 for Illustration)
A. Position heater into framed opening as illustrated. Slide unit into opening until
the front of the control housing is flush with the exterior coach skin.
B. Secure the control housing to the coach wall (framed opening) at the top and
sides of control housing compartment using screws or other suitable fasteners.
Recess the screws or fasteners back far enough from the front edge of control
housing (approximately 1 1/2") in orderto clear the flange on door frame. The door
frame, when installed, must not overlap onto screw or other fastener head. If due
to the wall thickness, it is not possible to secure the water heater without covering
the fastener head with the door frame, it is important to not over tighten the
fastener and distort the control housing. Over tightening of the fastener may cause
water heater leaks between the control housing and the door frame.
NOTE: Caulk around screw or fastener heads to assure water tight seal.
C. Install chocks, one on each side of water heater, as illustrated in Figure 1A.
D. On mesa or yoder type sidewalls, flatten the wall area around the opening.
E. Caulk around framed opening (trailer skin) as illustrated.
F. Caulk around door frame using 2 beads of silicone caulking (or suitable
caulking) - one on flange to seal to control housing and one around back side of
frame to seal to coach skin. (See detail A in illustration.)
G. Insert door frame into control housing and secure with four (4) No. 8-15 x
3 1/2" screws provided.
H. To install door, place the two holes in the bottom of the door over the door pins
on the frame. Close the door so that the latch protrudes through the slot in the
door. Turn latch 90 degrees to fasten door.
I. The module board on models SW12D and SW12DE is not secured to the water
heater. It is to be permanently mounted by the installer.
The module board must be mounted to where it is accessible for service yet out
of way of children. It should be located in a place where it cannot be subjected to
moisture, cleaning chemicals, flammable vapors and liquids, etc.
The board and all wiring to the board must be protected in order to prevent
damages and accidental contact with these parts. The module board may be
mounted with two (2) No. 6 x 5/8 screws or other suitable hardware.
MAKING WATER CONNECTIONS
A. Water connections are made at the rear of the water heater. Refer to Figure
3 for all models except SW12DEM. For SW12DEM, refer to Figure 5. Connect the
hot and cold water lines to the 1/2" female pipe fitting provided on rear of tank.
These fittings are marked “HOT” and “COLD”. NOTE: Inside each fitting is a
plastic fill tube. Its purpose is to enhance water circulation. DO NOT REMOVE
PLASTIC FILL TUBE.
IMPORTANT: Use a pipe thread compound suitable for potable water or pipe
thread tape on all connections to assure they will not leak.
B. For ease of removal, it is suggested that a pipe union be installed in each water
line.
C. Fill tank with water. Open both hot and cold water faucets to expel air from
tank. When tank is filled and water flows from faucets, close both faucets and
check all connections for leaks.
CAUTION: If you use air pressure to check for leaks, the pressure must not
exceed 30 PSI (in accordance with 4-9.1.1 of ANSI A119.2).
NOTE: After leak testing, drain water from tank.
MAKING GAS CONNECTIONS
A. Connect a 3/8" gas supply line to the 3/8 flare fitting at gas valve located in the
control housing. When making the gas connection, hold the gas fitting on the valve
with a wrench when tightening the flare nut. Failure to hold fitting secure could
result in a gas leak due to fitting being damaged. NOTE: It will be necessary to
remove the grommet from the control housing, make the gas connection at the
valve, then reinstall grommet.
WARNING! It is imperative that grommet and gas line through grommet be
caulked air tight. If not tightly sealed, moisture and potential harmful flue
products could vent through opening and into living area of trailer. (See
Figure 6.)
B. Turn on gas and check all fittings and connections for leaks, using a soap and
water solution. Correct even the slightest leak immediately.
WARNING! Do not use an open flame to check for leaks

3
Figure 2
Figure 3
MODELS
SW12D
SW12DE
MODEL SW12DEM
Figure 5
Figure 6
4
Figure 8
Figure 7
Figure 9
MAKING ELECTRICAL CONNECTIONS
12 VOLTS D.C.
A. Applicable to following models: SW12D, SW12DE, and SW12DEM.
B. Refer to Figure 2 for location of D.C. junction box on models SW12D and
SW12DE. Refer to Figure 5 for location of D.C. junction box on model
SW12DEM.
C. The electrical connections must be made in accordance with local codes and
regulations. In the absence of local codes and regulations, refer to the latest
edition of the National Electrical Code ANSI\NFPA No. 70.
In Canada, the electrical installation should conform with CSA standard CSA
C22.2 No. 148/Z240.6.2 Electrical Requirements for Recreational Vehicles and
CSA C22.1 Canadian Electrical Code Part 1 when installing the unit in
recreational vehicles and mobile homes respectively.
D. Make the 12 Volt D.C. electrical connections following the wiring diagram
illustrated in Figure 7.
If the power supply is to be from a convertor, we recommend that the converter
system be wired in parallel with the battery. This will serve two purposes:
1. Provide a constant voltage supply
2. Filter any A.C. spikes or volt surges
We recommend insulated terminals be used for all electrical connections.
MAKING ELECTRICAL CONNECTIONS
120 VOLTS A.C.
A. Applicable to following models SW12DE and SW12DEM.
B. Refer to Figure 2 for location of A.C. junction box on model SW12DE. Refer
to Figure 5 for A.C. junction box on model SW12DEM.
C. The electrical connections must be made in accordance with local codes and
regulations. In the absence of local codes and regulations, refer to the latest
edition of the National Electrical Code ANSI/NFPA No. 70.
In Canada, the electrical installation should conform with CSA standard CSA
C22.2 No. 148/Z240.6.2. Electrical requirements for Recreational Vehicles and
CSA C22.1 Canadian Electrical Code Part 1 when installing the unit in
recreational vehicles and mobile homes respectively.
D. Check rating plate and wiring diagram (Figure 8) before proceeding. Install
a fused safety switch or circuit breaker of adequate capacity between heater
and electrical power source. Attach the black and white wires from the fused
switch or breaker to corresponding colored wires in heater junction box. A green
wire from a well grounded source must be attached to the green nut in the
junction box.
CAUTION: Before applying the 120 VAC power to the water heater junction
box, be sure the switch for electric element is in the “OFF” position.
WARNING! Before the switch for the electric element is turned to the “ON”
position, the water heater tank m ust be filled with water. See “Safety
Warnings”.
INSTALLATION OF MOTOR AID HEAT EXCHANGER
A. Place copper “Y”s in heater as shown in Figure 9.
B. Secure hoses to “Y”s with hose clamps.
C. Attach hose from motor-aid heat exchanger to “Y”s.
D. Secure hoses to motor-aid and “Y”s with clamps.
E. Check all connections for water leaks and proper water circulation through
motor-aid heat exchanger, with engine running.
The system should be checked annually for deterioration of heater hose and
hose connections. Replace as needed.
MAINTENANCE
WARNING! If the user of this appliance fails to maintain it in the condition
in which it was shipped from the factory or if the appliance is not used
solely for its intended purpose or if appliance is not maintained in
accordance with the instructions in this manual, then the risk of a fire
and/or the production of carbon monoxide exists which can cause
personal injury, property damage or loss of life.
WARNING: For your safety,all repairs should be performed by your dealer
or a qualified service person.
A. Main Burner: Do not allow the burner to burn with a yellow flame, because
sooting will occur. (See Safety Warnings).
If the burner flame is yellow and has an erratic pattern, shut unit down and contact
a qualified service agency. Do not continue operating unit with improper burner
flame. (See Figure 10 for correct and incorrect burner flame appearance.)

5
Figure 11
Figure 10
B. Periodically inspect unit for soot. If soot is present anywhere on water heater,
immediately shut unit down and contact your dealer or a qualified service person.
Soot is a sign of incomplete combustion and must be corrected before operating
water heater. Areas to check would include:
1. Check for an obstruction in burner or the flue box.
2. Check the screen in the door to see that no foreign material has accumulated
to prevent flow of combustion and ventilating air.
3. Check to be sure there is no flame present at burner orifice or burner whenever
main gas valve is closed. This can be checked by turning the OFF\ON switch to
the “OFF” position.
C. Frequent checks should be made of the grommet on the gas inlet to assure
tight seal. (See “Making Gas Connections”).
D. Periodically check wiring and wire connection to be sure wiring is not
dam aged/frayed and that all terminals and connections are tight and in
compliance with codes (See “Making Wire Connections”).
SAFETY WARNINGS
WARNING! It is imperative that the water heater tank be filled with water
before operating the water heater. Operation of the water heater without
water in the tank may result in dam age to the tank and/or controls. This
type of damage is not covered by the limited warranty.
WARNING! Hydrogen gas may result if you have not used this heater for
two weeks or more. HYDROGEN GAS IS EXTREMELY FLAMMABLE. To
reduce the risk of injury under these conditions, open the hot water faucet
for several minutes at the kitchen sink before you use any electrical
appliance connected to the hot water system. If hydrogen is present, you
probably will hear an unusual sound such as air escaping through the
pipe as the water begins to flow.
Hydrogen gas may be present even after water has been drained from the
tank. Open faucet at sink and allow system to vent for several minutes (5-
10 m inutes).
Do not smoke or have any open flame near the open faucet. Do not
attempt to light pilot or main burner. On DSI models, be sure the switch
is “OFF”.
Should overheating occur, or the gas supply fail to shut off, shut off the
manual gas valve to the appliance before shutting off the electrical supply.
Do not use this appliance if any part has been submerged under water.
Immediately call a qualified service technician to inspect the appliance
and to replace any part of the control system and any gas control that has
been submerged under water.
Do not alter the operation of your water heater nor change the
design/construction of yourwater heater.Accessories are being marketed
for RV products which we do not recom mend. For your safety,
only factory authorized parts are to be used on your water heater.
Periodically inspect the vent for obstructions or presence of soot. Soot is
formed whenever combustion is incomplete. This is your visual warning
that the water heater is operating in an unsafe manner. If soot is present,
immediately shut the water heater down and contact your dealer or a
qualified service person.
When considering add-on rooms, porch or patio, attention must be given
to the venting of your water heater. For your safety, do not terminate the
vent on your water heater inside add-on room s, screen porch or onto
patios. Doing so w ill result in products of com bustion being vented into
the rooms or occupied areas.
Never operate the heater if you sm ell gas. Do not assum e that the smell
of gas in your RV is norm al. Any time you detect the odor of gas, it is to
be considered life threatening and corrected immediately. Extinguish any
open flames including cigarettes and evacuate all persons from the
vehicle. Shut off gas supply at LP gas bottle. (See Safety notice on front
cover of this manual.)
NOTE: Always open both the cold and hot water faucets when filling
vehicle water tank to allow air pockets to be forced out of the water heater.
When water flows from the heater faucets, close both faucets.
WARNING! Do not store or use combustible materials or liquids near or
adjacent to this heater.The appliance shall not be installed in any location
where flam m able liquids or vapors are likely to be present.
Be sure the power is "OFF" to the water heater ignition system during any
type of refueling and while vehicle is in motion or being towed.
The thermostat on your water heater is not adjustable. It is a temperature
sensing limit designed to m aintain a water tem perature of 130°F (54°C).
Water tem peratures over 125°F (49°C) can cause severe burns instantly
or death from scalds; therefore, be careful when using hot water.
Children, disabled and elderly are at highest risk of being scalded. Always
feel water before bathing or showering.
HIGH ALTITUDE DERATION
Suburban’s water heaters are certified by nationally recognized testing
laboratories for operation without modifications at altitudes up to 4,500 feet.
Operation above this elevation may require derating by 4 percent for every 1,000
feet above sea level. As an example, at 8,000 feet, the water heater should be
derated approximately 32 percent.
If the unit is not properly derated, lack of sufficient oxygen for combustion may
produce improper burner operation. Pilot outage caused by burner lift-off or
sooting from a yellow burner may occur indicating the possibility of carbon
monoxide. You may also notice a lack of efficiency in heating the water because
of incomplete combustion of the burner at these higher altitudes.
Consult with the local gas company, your dealer, an RV service agency or
Suburban Manufacturing Company for proper derating of the unit. Change-out of
the orifice (derating) should be done by the dealer or a qualified service agency.
NOTE: It is important that once the unit has returned to lower elevation (below
4,500 feet) this high altitude deration and pilot adjustments (if equipped) be
reversed for proper operation of the unit.
ANODE PROTECTION
The tank in this water heater is protected by a magnesium or aluminum anode to
prolong the life of the tank by absorbing the corrosive action of hot water. Under
norm al use, the anode rod will deteriorate and because of this, we recom mend it
be replaced yearly. NOTE: W ater with high levels of iron and/or sulfate will
increase the rate of deterioration; therefore, more frequent replacement may be
required. If anode rod is mostly eaten away, replace it with a new one. (See
Figure 11)
Operating the water heater without proper anode protection will decrease tank life
and will void your warranty on the tank. NOTE: Tank is drained by removing
anode rod (See “Drain and Storage” instructions).
To extend anode life, drain water from tank whenever RV is not being used. Avoid
any extended time of non use with water in tank.
Also, refer to section on winterizing.
WARNING! Do not replace the anode rod with any non-Suburban
accessory part, such as an “add-on” electric heating element. Items such
as these are not approved to be installed in Suburban products. They
could create an unsafe condition and will also void all warranties.
6
Figure 12
Figure 13
PRESSURE RELIEF VALVE
The temperature and pressure relief valve is designed to open if the temperature
of the water within the heater reaches 210°F, or if the water pressure in the heater
reaches 150 pounds. Recreational vehicle water systems are closed systems and
during the water heating cycle the pressure build-up in the water system will reach
150 pounds. When this pressure is reached, the pressure relief valve will open
and water w ill drip from the valve. This dripping w ill continue until the pressure is
reduced to below 150 pounds, and the valve closes. This condition is normal and
does not indicate a defective relief valve.
WARNING! Do not place a valve between the relief valve and the tank. Do
not plug the relief valve under any circumstances.
WATER WEEPING OR DRIPPING FROM PRESSURE
RELIEF VALVE
You may experience water weeping or dripping from your water heater’s Pressure
and Temperature (P & T) Relief Valve when your water heater is operating. Water
weeping or dripping from the P & T Valve does not always mean the P & T Valve
is defective. As water is heated, it expands. The water system in a recreational
vehicle is a closed system and does not allow for the expansion of heated water.
When the pressure of the water system exceeds the relieving point of the P & T
Valve, the valve will relieve the excess pressure.
Suburban recommends that a check valve not be installed directly at the inlet to
the water heater tank. This will increase weeping of the pressure relief valve.
WARNING! Do not remove or plug the relief valve.
One way to reduce the frequency of this occurrence is to maintain an air pocket
at the top of the water heater tank. This air pocket will form in the tank by design.
However, it will be reduced over time by the everyday use of your water heater.
To replenish this air pocket:
1. Turn off water heater.
2. Turn off cold water supply line.
3. Open a faucet in the RV.
4. Pull out on the handle of the Pressure Relief (P & T) Valve and allow water
to flow from the valve until it stops.
5. Release handle on P & T Valve - it should snap closed.
6. Close faucet and turn on cold water supply; as the tank fills, the air pocket
will develop.
Repeat this procedure as often as needed to reduce the frequency of the weeping
of the P & T Valve. If the weeping persists after following this procedure, you may
elect to install an expansion or accumulator tank in the cold water line between the
tank and check valve to relieve the pressure caused by thermal expansion.
Contact your local dealer for assistance.
THERMOSTAT AND MANUAL RESET
MODELS: SW12D, SW12DE, and SW12DEM
The m odel water heaters listed above are equipped with a high tem perature limit
as a cut-off device. Temperature above 180°F will cause manual reset button to
trip shutting down main burner.
To activate burner, the water temperature must be below 110°F, push reset button
to re-activate burner.
THERMOSTAT AND MANUAL RESET
MODELS SW12DE and SW12DEM
The m odel water heaters listed above are equipped with a high temperature limit
as a cut-off device. Temperature above 180°F will cause manual reset button to
trip shutting down the electric element.
To activate element, the water temperature must be below 110°F, push reset
button to re-activate the electric element.
DRAINING AND STORAGE INSTRUCTIONS
If RV is to be stored during winter months, the w ater heater must be drained to
prevent damage from freezing.
1. Turn off electrical power to water heater either at the switch from the electrical
element or a breaker.
2. Shut off gas supply to water heater.
3. Turn off pressure pump on water system.
4. Open both hot and cold water faucets.
5. Remove anode rod from tank.
6. Follow RV manufacturer’s instructions for draining entire water system.
NOTE: Be certain to refill water heater with water and remove all air from tank and
lines before re-lighting or before turning on electrical power.
ODOR FROM HOT WATER SYSTEM
Odor from the hot water system is not a service problem and many water supplies
contain sufficient amounts of sulphur to produce an odor. The odor is similar to
rotten eggs and is often referred to as "sulphur water". It is not harmful - only
unpleasant to smell. Sulphur water can be caused by a chemical action or by
bacteria. The solution to eliminate is chlorination of the water system. Add about
six (6) ounces of chlorinated common household liquid bleach to each 10 gallons
in the water tank. Then run the chlorinated water throughout the system, opening
each faucet one at a time until you smell the chlorine. Let the RV sit for a few days
and the chlorine should take care of the problem. Then you will need to take care
of the chlorine. Remove the chlorine by flushing the system with fresh water. This
may take several attempts. You may consider adding a filtering system that
removes chlorine and prevents sulphur w ater. If the sulphur or rotten egg smell
continues, flush the system once again as described above and replace anode rod
as necessary.
REMOVING WATER HEATER
1. Shut off gas supply and disconnect gas supply line from water heater.
2. On all Electric Models, disconnect 120 V.A.C. supply at junction box mounted
on heater.
3. On all DSI Models, disconnect 12 V.D.C. power supply at junction box on
heater.
4. On Models SW12D and SW12DE disconnect all wires at module board.
5. Shut off water supply. Drain water from tank following instructions under
“Draining and Storage”.
6. Disconnect hot and cold water lines from water heater.
7. Remove screws or nails securing control housing to framed opening.
8. Slide heater out. To reinstall, follow instructions in manual under “Installation
Instructions”.
WINTERIZING
If your water heater plumbing system is equipped with a bypass kit, use it to close
off the water heater, drain the water heater completely and leave the water heater
closed off (out of the system) in the bypass position particularly if you are
introducing antifreeze into the plumbing system. Antifreeze can be very corrosive
to the anode rod creating premature failure and heavy sediment in the tank. If the
plumbing system is not equipped with a bypass kit, and you intend to winterize by
adding antifreeze to the system, remove the anode rod (storing it for the winter)
and replace it with a 3/4" drain plug.

7
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING! If the user of this appliance fails to maintain it in the condition in which is was shipped from the factory or if the appliance is not used solely
for its intended purpose or if appliance is not maintained in accordance with the instruction in this manual, then the risk of a fire and/or the production
of carbon monoxide exists which can cause personal injury, property damage or loss of life.
OPERATING AND LIGHTING INSTRUCTIONS
WARNING! If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss of
life.
WARNING: Before operating water heater, be sure tank is filled with
water. See “Safety Warnings”.
A. This appliance does not have a pilot. It is equipped with an ignition device
which automatically lights the burner. Do not try to light the burner by hand.
B. BEFORE LIGHTING smell all around the appliance area for gas. Be sure to
smell next to the floor because some gas is heavier than air and will settle on the
floor.
WHAT TO DO IF YOU SMELL GAS
CDo not try to light any appliance.
CDo not touch any electric switch.
CDo not use any phone in your building.
CImmediately call your gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions.
CIf you cannot reach your gas supplier, call the fire department.
C. This is an automatic gas valve, no adjustments are necessary. Do not
attempt to repair the gas valve. This may result in a fire or explosion.
D. Do not use this appliance if any part has been under water. Im mediately call
a qualified service technician to inspect the appliance and to replace any part of
the control system and any gas control which has been under water.
E. Before operating water heater, check the location of the vent to make sure it
will not be blocked by the opening of any door on the trailer. If it can be blocked,
do not operate the water heater with the door open.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information provided.
2. Turn off all electric power to the appliance.
3. Turn “OFF” gas supply.
4. Wait five minutes for gas to clear the area. If you smell gas then STOP!
Follow instructions in item B of the safety information. If you don’t smell gas, go
to next step.
5. Turn “ON” gas supply.
6. Turn on electrical power to the appliance.
7. Turn switch to "ON" position. If the burner does not light, the system will
automatically attempt two more tries for ignition before lock-out. NOTE: Each
ignition cycle will have a 15 second purge before spark cycle if system is a three
try system.
8. If lockout occurs before main burner lights, turn switch to “OFF”, wait five
seconds and turn switch to “ON” position. This will restart the ignition cycle. The
first start-up of the heater m ay require several ignition cycles before all air is
purged from the gas lines.
If the burner will not come on, the following items should be checked before
calling a service person.
1. Switch turned off.
2. Gas supply to heater is empty or turned off.
3. Reset button on ECO is tripped.
OPERATING INSTRUCTIONS
FOR UNITS WITH ELECTRIC ELEMENT
Electric water heaters are designed to operate with a minimum amount of service
problems; however, proper operation and care is essential.
By far the most common trouble with electric water heaters results from
energizing the water heater before it is filled with water. Even brief operation of
the electric element without water in the tank will burn-out the electric heating
element.
To energize the electric heating element, turn the switch to "on". The switch is
located behind the water heater door in the lower left corner of the control
housing. The water temperature will be regulated by the thermostat.
TO TURN OFF WATER HEATER
1. Turn switch to “OFF” position.
2. Turn off electrical power to the appliance.
3. Turn off gas supply.
4. If vehicle is to be stored or heater is going to be turned off while subject to
freezing temperature, drain water heater. (See “Draining and Storage
Instructions.”)
8
PARTS ILLUSTRATION AND REPLACEMENT PARTS LIST
Only factory authorized parts are to be used. Do not attem pt to repair
defective parts.
When ordering repair parts from your dealer or a distributor, always give the
following information:
1. Part Number (Not Item No.)
2. Part Description
3. Model No. and Serial No. of your Heater
4. Number of Parts Required
PARTS LIST FOR MODELS
SW12D and SW 12DE (Figure 14)
Item Part Number
No. Description SW12D SW12DE
1 FoamJacketAssy.Complete.......................................... 102056 102056
(with any order for Foam Jacket, also order Banding Kit 520772)
2 Switch, Lamp and Plate Assembly (Putty) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232625 232625
3 ModuleBoard...................................................... 520814 520814
5 CoverModuleBoard ................................................ 090487 090487
6 Bushing,Snap1/2".................................................. 070270 070270
7 Bushing,StrainRelief5/8" ............................................ 231809 231809
8 Nut10-24Keps(Green).............................................. 121576 121576
9 Bushing,Snap7/8".................................................. ------ 230218
10 Screw#10x3/8 .................................................... ------ 121252
11 Cover,JunctionBox ................................................. ------ 090447
12 D.C.JunctionBoxAssembly .......................................... 090517 090517
13 Screw 8 x 3/8 Hex HD (Junction Box Mounting) . . . . . . . . . . . . . . . . . . . . . . . . . . . 121669 121669
14 Screw10x3/8(5Required) .......................................... 121252 121252
15 Flue Collector Back Assembly Complete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101777 101777
17 Screw10x1/4 ..................................................... 121577 121577
18 Valve,PressureRelief ............................................... 161157 161157
19 Screw8x3/8HexHD(2Required) ..................................... 121669 121669
20 Gasket,ThermostatCover ............................................ 070987 070987
21 Cover,Thermostat/Hi-Limit ........................................... 090454 090467
22 Screw8-32x3/8HexHD(2Required) .................................. 121407 121407
23 Bracket,ElectrodeMounting .......................................... 063187 063187
24 Grommet ......................................................... 070874 070874
25 Electrode ......................................................... 232258 232258
26 Screw8-32x3/8HexHD(1Required) .................................. 121407 121407
27 BurnerAssemblywithorifice .......................................... 010843 010843
29 1/4LoxitNut(ManifoldtoValve) ....................................... 171475 171475
30 Screw8x3/8HexHD(3Required) ..................................... ---------- 121669
31 Cover,Element .................................................... ---------- 090445
32 GasketElementCover ............................................... ---------- 070988
33 Bushing,Snap1/2".................................................. ---------- 070270
34 Anode............................................................ 232767 232767
35 Grommet,GasInlet ................................................. 070989 070989
36 A.C.JunctionBoxAssembly .......................................... ---------- 090450
37 Switch Assembly 120 V.A.C. T-Stat/Hi-Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ---------- 232306
38 Switch Assembly 12 V.D.C. T-Stat/Hi-Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232282 232282
39 Nut10-32Keps(OnePerSwitch) ...................................... 121698 121698
40 Bushing,Snap3/8".................................................. 070483 070483
41 Bushing,Snap1/2".................................................. 070270 070270
42 Switch,ElectricElement.............................................. ---------- 232362
43 Screw10x3/8(5Required) .......................................... 121252 121252
44 GasFitting ........................................................ 170374 170374
45 ElectricElementwithGasket .......................................... ---------- 520900
46 Valve,Gas(LP) .................................................... 161109 161109
47 ManifoldOutlet ..................................................... 171420 171420
48 ValveMountingBracketAssembly...................................... 063245 063245
49 Screw8-32x3/8HexHD(2Required) .................................. 121958 121958
50 Nut1/4-20HexKeps ................................................ 121474 121474
51 BurnerBracket .................................................... 063444 063444
52 Screw 8mm - 4.0 x 1/2 Hex Washer Head (2 Required) . . . . . . . . . . . . . . . . . . . . . 121943 121943
53 1/4LoxitNut(ManifoldtoBurner) ...................................... 171463 171463
54 ElectrodeWire(NotShown)........................................... 232459 232459
55 Screw 10 x 1/4 (No Substitute) (2 Required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121577 121577

9
Figure 14
10
FRONT VIEW
SW12DEM
Figure 16
PARTS LIST FOR MODEL SW12DEM
(Figures 15 and 16)
Item Part Number
No. Description SW12DEM
1 CoverModuleBoard...................................... 090340
2 Screw10x3/8(3Required) ................................ 121252
3 Screw 8 x 3/8 Hex HD (2 Required) . . . . . . . . . . . . . . . . . . . . . . . . . . 121669
4 Cover,JunctionBox(12V.D.C.) ............................. 090344
5 Screw10-32x3/8(Green) ................................. 121702
6 Screw6x5/8(2Required) ................................. 121357
7 Switch, Lamp and Plate Assembly (Putty) . . . . . . . . . . . . . . . . . . . . . 232625
8 Bushing,Snap7/8" ....................................... 230218
9 Insulator,ModuleBoard ................................... 070807
10 ModuleBoard ........................................... 520814
11 Cover, Junction Box (120 V.A.C.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 090464
12 Nut10-24Keps(Green) ................................... 121576
13 Bushing ................................................ 070486
14 Screw10x3/8(5Required) ................................ 121252
15 Flue Collector Back Assembly Complete . . . . . . . . . . . . . . . . . . . . . . 101777
17 Screw10x1/4 .......................................... 121577
18 Valve,PressureRelief .................................... 161157
19 Screw 8 x 3/8 Hex HD (2 Required) . . . . . . . . . . . . . . . . . . . . . . . . . . 121669
20 Gasket,ThermostatCover ................................. 070987
21 Cover,Thermostat/HiLimit ................................. 090467
22 Screw 8-32 x 3/8 Hex HD (2 Required) . . . . . . . . . . . . . . . . . . . . . . . 121407
23 Bracket,ElectrodeMounting................................ 063187
24 Grommet(2Required) .................................... 070874
25 Screw 8-32 x 3/8 Hex HD (1 Required) . . . . . . . . . . . . . . . . . . . . . . . 121407
26 Electrode............................................... 232258
Item Part Number
No. Description SW12DEM
27 BurnerAssemblywithorifice...................................010843
29 1/4LoxitNut(ManifoldtoValve)................................171475
30 Screw8x3/8HexHD(3Required) .............................121669
31 Cover,Element .............................................090445
32 Gasket,ElementCover.......................................070988
33 Switch,ElectricElement ......................................232362
34 Anode ....................................................232767
35 Grommet,GasInlet..........................................070989
36 Switch Assembly, 120 V.A.C. T-Stat/Hi-Limit . . . . . . . . . . . . . . . . . . . . . . 232306
37 Switch Assembly, 12 V.D.C. T-Stat/Hi-Limit . . . . . . . . . . . . . . . . . . . . . . . 232282
38 Nut10-32Keps(1PerSwitch) .................................121698
39 Bushing,Snap3/8" ..........................................070483
40 Bushing,Snap1/2" ..........................................070270
41 Screw10x3/8(5Required) ...................................121252
42 GasFitting.................................................170374
43 ElectricElementwithGasket ..................................520900
44 Valve,Gas(LP).............................................161109
45 Manifold,Outlet.............................................171420
46 ValveMountingBracketAssembly ..............................063245
47 Screw 8-32 x 3/8 Hex HD (2 Required) . . . . . . . . . . . . . . . . . . . . . . . . . . 121958
48 Bushing,Snap1/2" ..........................................070270
49 Nut1/4-20HexKeps.........................................121474
50 BurnerBracket .............................................063444
51 Screw 8mm - 4.0 x 1/2 Hex Washer Head (2 Required) . . . . . . . . . . . . . . 121943
52 1/4LoxitNut(ManifoldtoBurner) ...............................171463
53 ElectrodeWire(NotShown) ...................................232791
REAR VIEW
SW12DEM
Figure 15

11
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Part Number 203413
11-1-03
For future reference, you should record the following information
MODEL NUMBER _________________________________
SERIAL NUMBER _________________________________
STOCK NUMBER _________________________________
DATE OF PURCHASE _____________________________
TWO YEAR LIMITED WARRANTY
SUBURBAN RECREATIONAL VEHICLE WATER HEATER
TWO YEAR LIMITED WARRANTY
This Suburban product is warranted to the original purchaser to be free from defects in material and workmanship under normal use and
maintenance for a period of two years from date of purchase whether or not actual use begins on that date. It is the responsibility of the
consumer/owner to establish the warranty period. Suburban does not use warranty registration cards for its standard warranty. You are required
to furnish proof of purchase date through a Bill of Sale or other payment record.
Suburban will replace any parts that are found defective within the first two years and will pay a warranty service allowance directly to the
authorized Suburban Service Center at rates mutually agreed upon between Suburban and its authorized service centers. Replacement parts
will be shipped FOB the shipping point within the Continental United States, Alaska and Canada to authorized service centers performing such
repairs. All freight, shipping and delivery costs shall be the responsibility of the owner. The exchanged part or unit will be warranted for only the
unexpired portion of the original warranty. Before having warranty repairs made, confirm that the service agency is an authorized service center
for Suburban. DO NOT PAY THE SERVICE AGENCY FOR WARRANTY REPAIRS; SUCH PAYMENTS WILL NOT BE REIMBURSED.
Suburban reserves the right to examine the alleged defect in the water heater or component parts, and it is the owner’s obligation to return the
water heater and/or component parts to Suburban or its representative. When returning a water heater, it must include all component parts and
the serial number plate. Returned component parts must be individually tagged and identified with the water heater’s model number, serial number
and date of installation.
For warranty service, the owner/user should contact the nearest authorized Suburban Service Center, advising them of the model and serial
numbers (located on the water heater) and the nature of the defect. Transportation of the unit to and from the Service Center and/or travel
expenses of the Service Center to your location is the responsibility of the owner/user. A listing of authorized Service Centers is included in the
owner’s packet supplied with the water heater and a current listing may be obtained from Suburban. If you cannot locate an authorized service
center locally, the service agency chosen to perform warranty repairs must contact our Service Department at 423-775-2131 for authorization.
Unauthorized repairs made will not be paid by Suburban.
THREE YEAR LIMITED WARRANTY ON TANK
The inner tank is further warranted to be free from defects in material and workmanship during the third year after the date of original purchase.
A replacement water heater will be provided under the same conditions as stated in the two year warranty EXCEPT no labor reimbursement will
be provided.
LIMITATION OF WARRANTIES
ALL IMPLIED WARRANTIES (INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY) ARE HEREBY LIMITED IN DURATION TO THE
PERIOD FOR WHICH EACH LIMITED WARRANTY IS GIVEN. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED
WARRANTY LASTS SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU. THE EXPRESSED WARRANTIES MADE IN THIS WARRANTY
ARE EXCLUSIVE AND MAY NOT BE ALTERED, ENLARGED, OR CHANGED BY ANY DISTRIBUTOR, DEALER OR OTHER PERSON
WHOMSOEVER.
SUBURBAN WILL NOT BE RESPONSIBLE FOR:
1. Normal maintenance as outlined in the installation, operating and service instructions owner’s manual including cleaning of component parts
and cleaning or replacement of the burner orifice. Any water damage arising, directly or indirectly, from any defect in the water heater or
component parts or from its use.
2. Initial checkouts and subsequent checkouts which indicate the water heater is operating properly, or diagnosis without repair.
3. Damage or repairs required as a consequence of faulty or incorrect installation or application not in conformance with Suburban instructions.
4. Failure to start and/or operate due to loose or disconnected wires; water or dirt in controls, fuel lines and gas tanks; improper gas pressure;
low voltage.
5. Cleaning or adjustment of components; electrode, burner tube, pilot and thermocouple.
6. Costs incurred in gaining access to the water heater.
7. Parts or accessories not supplied by Suburban.
8. Freight charges incurred from parts replacements.
9. Damage or repairs needed as a consequence of any misapplication, abuse, unreasonable use, unauthorized alteration, improper service,
improper operation or failure to provide reasonable and necessary maintenance.
10. Suburban products whose serial number has been altered, defaced or removed.
11. Suburban products installed or warranty claims originating outside the Continental U.S.A., Alaska, Hawaii and Canada.
12. Damage as a result of floods, winds, lightning, accidents, corrosive atmosphere or other conditions beyond the control of Suburban.
13. ANY SPECIAL, INDIRECT OR CONSEQUENTIAL PROPERTY, ECONOMIC OR COMMERCIAL DAMAGE OF ANY NATURE
WHATSOEVER. Some states do not allow the exclusion of incidental or consequential damages, so the above limitation may not apply to you.
NO REPRESENTATIVE, DEALER OR OTHER PERSON IS AUTHORIZED TO ASSUME FOR SUBURBAN MANUFACTURING COMPANY ANY
ADDITIONAL, DIFFERENT OR OTHER LIABILITY IN CONNECTION WITH THE SALE OF THIS SUBURBAN PRODUCT.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
IF YOU HAVE A PRODUCT PROBLEM
FIRST:
If your RV has its original water heater and is still under the RV manufacturer’s warranty, follow the steps described in your RV owner’s manual.
SECOND:
Contact a conveniently located recommended Suburban Service Center. Describe to them the nature of your problem, make an appointment, if
necessary, and provide for delivery of the water heater to the selected service center.
THIRD:
For the location of the nearest Service Center, refer to the listing provided or contact:
Suburban Manufacturing Company
Customer Service Department
Post Office Box 399
Dayton, Tennessee 37321
[phone], Ext. 1