Dometic G9EXT Mode D'emploi page 3

Preventative Maintenance Requirements—Preservation of Warranty and Water Heater Life Extension
•
Periodically clear all obstructions in Burner Orifice and pilot Assembly (dirt, spider webs, etc.)
•
Periodically clean Burner Tube with small brush
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Check air adjustment of Burner by positioning the air shutter 1/4 open (blue flame with small trace of yellow).
•
Check Alignment of Burner tube and Orifice—Must be straight
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PILOT MODEL—Check orifice for contamination. Clean if flame is low, replace assembly if cleaning fails.
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ELECTRONIC MODEL—Check electrode for cracks and gap (Spark probe and Ground gap should be 1/8")
Tank Maintenance
Failure to follow these instructions May result in Denial of Your Warranty Coverage!
Caution!
Always turn off the main water supply (pump or water supply hook-up), allow the water to cool, then drain the tank by removing drain plug.
Frequency:
Full-Time RV'er, Every (60) days (Southwest US, every (30) days). Part-Time RV'er, Minimum of 2X annually (Southwest, every (90) days).
Reason:
The Life of the tank and performance of the water heater are directly affected by water quality! High mineral content will cause corrosion and
sediment deposits that shorten the life of the tank, element, relief valve, and Mixing Valve (XT Models). (Lack of proper maintenance of the tank will cause
Mixing Valves on XT Models to malfunction, requiring costly service procedures to clean and/or replace at the owner's expense.)
Flushing the Tank
1.
Turn off the main water supply (pump or water hook-up source).
2. Drain the water heater by removing the drain plug. If the water flows sporadically or trickles instead of a steady stream, we recommend the following
action: First, open the Pressure/Temperature relief Valve to allow air into the tank and Second, using a small gauge wire or coat hanger, poke through
the drain coupling to dislodge any obstructions.
3.
With the tank drained, approximately two quarts of water remain in the bottom (note drain plug position in illustration above). This water contains most
of the harmful corrosive particles. To remove these materials, Dometic recommends use of a commercially available "RV Water Heater Flushing
Tool". Simply running water through the inlet does not stir up and flush out all sediment. The wand of a flushing tool allows you to move around at
different angles inside the tank with a higher pressure water jet, suspending and flushing the materials back out of the drain coupling. Continue flushing
until the water being flushed from the drain coupling runs clear.
4. Replace the drain Plug.
Prior to storing your RV, Follow Steps 1-4 of "Flushing the Tank" above. Note: The approximately (2) quarts of water that remains in the bottom of the
tank will not cause freeze damage to the tank. Caution!: An un-drained tank, (water level above the drain plug level), will crack the tank in freezing conditions.
Unpleasant Odors
A "rotten egg odor" (hydrogen sulfide) may be produced when the electro galvanic action of the cladding material releases hydrogen from the water. If
sulfur is present in the water supply the two will combine and produce an unpleasant smell. To remedy the problem, first complete the (4) steps in "Flushing
the Tank" above. When the tank is flushed, perform the following:
1. Remove the Pressure/Temperature relief Valve. Mix a solution of (4) parts white vinegar to (2) parts water. (For a 6 gallon tank, use (4) gallons of vine
gar to (2) gallons of water.) With a funnel, carefully pour the solution into the tank through the P&T coupling. Re-install the P&T Relief Valve.
2. Turn on the water heater and allow the water to heat up through a full cycle (this may take up to 45 minutes.) It is recommended you allow the water
heater to operate through 3 or 4 additional heat maintenance cycles.
3. Turn off and allow to cool. When cool, remove the drain plug and drain. Then repeat Steps 3 and 4 of "Flushing the Tank" above.
4. Refill the tank with fresh water that contains no sulfur.
Dripping Pressure Temperature Relief Valve
A Pressure Temperature Relief Valve, dripping while the water heater is in use, DOES NOT mean it is defective. During normal use, water expands as it is
heated in the closed water system. The Dometic water heater is designed with an internal air gap at the top of the tank to absorb the expansion and reduce
the dripping. In time, this air gap will be absorbed and need to be restored. To restore the Air Gap:
1. Turn off the main water supply (pump or water hook-up source) and allow water to cool.
2. Open the nearest hot water faucet to the water heater.
3. Pull the handle on the Pressure Temperature Relief Valve straight out and allow water to flow until it stops flowing.
4. Trip the handle on the relief valve allowing it to snap shut, shut off the hot water faucet, turn on the water supply, and turn the water heater on. Test.
XT Models—Special Requirements
If you experience low flow from the hot water faucet or notice the water is not as hot coming from the water heater, you may have to have the Mixing Valve
serviced by a Certified Service Technician. Low flow or cold flow from the XT water heater is a result of corrosion on the seats and/or debris blocking the
inlet screen (if equipped) of the mixing valve. When the technician removes the mixing valve, cleans the screen (if equipped) and soaks the valve in a hot
white vinegar bath, he will also complete the "Flushing the Tank" procedure as corrosion and sediment from improper "Tank Maintenance" is the cause of
this condition.
Altering Dometic Water Heaters
If the water heater has been altered the Warranty will be Void
Use of Aftermarket Heating Element Devices (Hot Rods) can lead to an out-of-control heating of water in the tank and catastrophic wet side explosion.
These devices lack critical safety controls. Personal injury and product damage may result. Replacing the Dometic drain plug with an Anode Rod will dam-
age the coupling with cathodic action and product damage will result. Dometic water heater tanks are constructed of a high strength aluminum. The interior
of the tank consists of a .0015 thick, type 7072 clad aluminum (pure aluminum and zinc) fused to the core in the rolling process. This material protects the
tank from the affects of heavy metals and salts found throughout North America. It is anodic to these heavy metals and acts much like an anode in a steel
glass-lined tank, except it lasts much longer.
Use of Aftermarket Heating Elements or Anode Devices are not compatible with Dometic Water Heaters and will void the warranty!
General—Burner Maintenance
Winterizing
14
9. Attach access door.
a. Snap hinge pin ( 3-C) into clip (
FIG
b. Slide cover ( 3-E) onto hinge pin.
FIG
c. Slide hinge pin into cover, snapping into clip at same time (
: To remove hinge pin, support access cover and apply force to
NOTE
corner of hinge pin.
10. Disconnect unit and its individual shut-off valve from gas supply
line during any pressure testing of system in excess of 1/2 PSIG
(3.4 kPa, 14˝ water column [W.C.]).
than maximum indicated on rating plate of gas valve (13˝ W.C.).
Isolate unit from gas supply line by closing its individual manual
shutoff valve during any pressure testing ≤ 1/2 psig.
FIRE AND/OR EXPLOSION
• use matches, candles or other sources of ignition when
DO NOT
checking for gas leaks.
11. Turn on gas and check water heater and all connections for gas
leaks with leak detecting solution.
12. Fill water heater tank, check all connections for water leaks.
MIXING VALVE
- ( 9)
FIG
SCALDING INJURY
Valve is not serviceable, it must be replaced.
•
• Replacement by a Certified Service Technician only.
Tampering with valve will result in scalding injury.
•
Tampering with valve will void warranty.
•
THIS VALVE IS A SAFETY COMPONENT AND MUST NOT BE REMOVED FOR ANY REASON
OTHER THAN REPLACEMENT. REMOVAL FOR REPLACEMENT BY A CERTIFIED SERVICE
TECHNICIAN ONLY . The water heater is equipped with a mixing
(moderating) valve which mixes cold water with higher temperature
water to moderate outlet water to approximately 130˚F. It is also
equipped with a higher temperature thermostat, raising the storage
water temperature.
PRESSURE-TEMPERATURE RELIEF VALVE -
SCALDING INJURY
Valve is not serviceable, it must be replaced.
•
Tampering with valve will result in scalding injury.
•
Tampering with valve will void warranty.
•
place a valve, plug or reducing coupling on outlet part of
• DO NOT
pressure-temperature relief valve.
THIS VALVE IS A SAFETY COMPONENT AND MUST NOT BE REMOVED FOR ANY REASON
OTHER THAN REPLACEMENT. This water heater is equipped with a
temperature and pressure relief valve that complies with the standard
for Relief Valves and Automatic Gas Shutoff Devices for Hot Water
Systems, ANSI Z21.22.
If you use a discharge line, do not use a reducing coupling or other
restriction smaller than outlet of relief valve. Allow complete drainage
of both valve and line.
90091 06/07/2016
FOR REPLACEMENT PARTS:
3-D). • install anything less than a combination temperature-pressure
FIG DO NOT
relief valve certified by a nationally recognized testing laboratory that
3-D). maintains periodic inspection of product of listed equipment or
FIG
materials, as meeting requirements for Relief Valves and Automatic
Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22.
Valve must have a maximum set pressure not to exceed 150 psi.
• Install valve into opening provided and marked for this purpose on
set inlet pressure higher water heater.
DO NOT
• Installation must conform with local codes or in the absence of local
codes, American National Standard for Recreational Vehicles, ANSI
A119.2/NFPA 50IC.
• For an external electrical source, ground this unit in accordance with
National Electrical Code ANSI/NFPA70.
WARNING
Your DOMETIC WATER HEATER is now ready for operation. Continue
to HOW TO OPERATE YOUR WATER HEATER.
CONSUMER SAFETY WARNINGS
store or use gasoline or other flammable vapors and liquids in
• DO NOT
the vicinity of this or any other appliance.
Should overheating occur, or gas supply fail to shut off, turn gas
WARNING •
OFF at the LP tank. On ELECTRONIC IGNITION MODEL turn operating
switch to OFF position and remove red wire from left hand terminal
of ECO switch or turn gas OFF at the LP tank.
Use with LP gas only.
•
Shut off gas appliances when refueling.
•
Turn gas OFF at the LP tank when vehicle is in motion. This disables
•
all gas appliances. Gas appliances must never be operated while
vehicle is in motion. Unpredictable wind currents may be created
which could cause flame reversal in the burner tube, which could
result in fire damage. The thermal cut off fuse could also be
unnecessarily activated resulting in a complete shutdown of the
water heater requiring replacement of the thermal cut off. See
maintenance of electronic ignition water heaters for further
explanation of the thermal cut off.
( 3-G)
FIG
LP tanks must be filled by a qualified gas supplier only.
•
WARNING
HOW TO OPERATE YOUR WATER HEATER
Do not smoke or have any flame near an open faucet.
•
WARNING
EXPLOSION
If water heater has not been used for more than two weeks, hydrogen
gas may form in water line. Under these conditions to reduce the risk
of injury, open hot water faucet for several minutes at kitchen sink
before you use any electrical appliance connected to hot water system.
If hydrogen gas is present, you will probably hear sounds like air
escaping through the pipe as water begins to flow.
• Do not tamper with orifice or mixing valve.
• Do not operate without water in tank.
3
WARNING
EXPLOSION OR FIRE
CAUTION
FIRE
WARNING
SCALDING INJURY
CAUTION
PRODUCT FAILURE