Special Requirements For Ext Models; Servicing The Mixing Valve; Servicing The P/T Relief Valve - Dometic WH - 6GA Manuel D'installation Et D'utilisation

L .P . Gas Water Heater
With the tank drained, approximately two quarts of
water remain at the bottom of the tank. This water
contains most of the corrosive particles. To remove
these particles, use an "RV Water Heater Flushing
Tool." The wand of this flushing tool allows the water
jet to clean at different angles inside of the tank.
Cleaning at different angles inside of the tank will
suspend and flush the corrosive particles out of the
drain coupling.
3. Continue flushing the tank until the water being
flushed from the drain coupling is draining as clear
water.
4. Replace the drain plug.
6.4.4 Flushing to Remove Unpleasant
Odor
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.
1. Turn off the main water supply.
2. Remove the drain plug to drain the water heater tank.
3. Reinstall the drain plug.
4. Remove the P/T relief valve.
5. Mix a solution of four parts white vinegar to two parts
water.
6. With a funnel, carefully pour the solution into the
tank.
7. Cycle the Water Heater with the vinegar/water
solution, letting it run under normal operation four to
five times.
8. Remove the drain plug and thoroughly drain all of the
water from the tank.
9. Flush the Water Heater to remove any sediment.
You may flush the tank with air pressure or fresh
water. Pressure may be applied through either
the inlet or outlet valves on the rear of the tank or
through the P/T relief valve coupling located on the
front of the unit. If flushing through the P/T relief
valve, lift the handle and apply the air pressure.
EN
6.5 Special Requirements for EXT
Models
If you experience low flow from the hot water faucet or
notice the water is not as hot coming from the Water
Heater, the mixing valve may be faulty. Low flow or cold
water from the EXT water heater models is a result of
corrosion on the seats and/or debris blocking the inlet
screen (if equipped) of the mixing valve. Call a technician
for repair if this problem occurs.

6.6 Servicing the Mixing Valve


WARNING: SCALDING HAZARD. Failure to
obey these warnings could result in death or
serious injury.
• The mixing valve is not serviceable and must be
replaced if it is found to be faulty.
• The mixing valve must only be replaced by a certified
technician.
• Tampering with mixing valve will result in scalding
injury.
I Tampering with the mixing valve will void the
warranty.
I This valve is a safety component and must not be
removed for any reason other than replacement.
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 (54°C). It is also equipped with a
higher temperature thermostat, raising the storage water
temperature.

6.7 Servicing the P/T Relief Valve


WARNING: EXPLOSION OR SCALDING
HAZARD. Failure to obey the following
warnings could result in death or serious injury.
• Do not tamper with the P/T relief valve.
• Do not place a valve, plug or reducing coupling on
the outer part of the P/T relief valve.
I The P/T relief valve is a safety component and
must not be removed for any reason other than
replacement.
Maintenance And Care
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