Atwood Mobile Products Water Heater Water Heater Exchanger User Manual

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PRESSURE-TEMPERATURE RELIEF VALVE
Weeping or dripping of a pressure-temperature relief valve while the water heater is running DOES NOT mean it is
defective. This is normal expansion of water as it is heated in the closed water system of a recreation vehicle. The
Atwood water heater tank is designed with an internal air gap at the top of the tank to reduce the possibility of weeping
and dripping. In time, the expanding water will absorb this air. To replace the air follow these steps:
Step 1: Turn off water heater
Step 2: Turn off incoming water supply
Step 3: Open the closest hot water faucet in the coach
Step 4: Pull handle of pressure-temperature relief valve straight out and allow water to flow until it stops.
Step 5: Allow pressure-temperature relief valve to snap shut, turn on water supply and close faucet.
WATER HEATER TANK CORROSION
Pinhole leaks from galvanic corrosion may cause the water heater tank to fail.
Microscopic particles of metals (like iron and copper) suspended in water, set up a reaction inside the water heater that
is not unlike the principle on which an automotive battery operates. The aluminum tank is the anode and the metals in
the water serve as the cathode. Consequently, the aluminum gradually sacrifices itself and aluminum particles are carried
away with the water flow.
A white scaly material (aluminum oxide) often is formed around the points where the heaviest action is taking place and
heat accelerates the process. Severity of the problem varies considerably in different locales depending on the metal and
mineral content of the water. White deposits inside the water heater tank are usually from water impurities that have
settled out.
Periodic flushing of the water heater tank under pressure is recommended to slow down this process. For flushing
instructions see your owners manual or contact Atwood for a copy of our recommended procedure.
ATWOOD CLAD TANK
The Atwood water heater tank is constructed of a core of high strength aluminum. The interior of the tank consists of a
15% thickness of type 7072 aluminum (pure aluminum and zinc) that is fused to the core during the rolling process.
This material protects the tank from the affects of heavy metals and salts found in waters throughout the country. It is
anodic to these heavy metals and acts much like an anode in a steel glass lined tank except it will last much longer.
There is also no need to replace an anode on a yearly basis.
Flushing the tank on a regular basis has been found to be helpful in insuring the best performance of your water hater
and adding to the useful life of the tank. For flushing instructions see your owners manual or contact Atwood for a copy
of our recommended procedures.
Air Expansion Pocket
Relief Valve
125/150 psi
210°
Hot Water Outlet
Cold Water Inlet
1/2" N.P.T.
Drain Plug

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