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10
Maintenance
Storage Tank Maintenance
Anodes
The storage tank is equipped with two magnesium
anodes designed to extend the life of the storage
tank. Slowly consumed over time, the anode protects
the glass-lined tank from corrosion. It is strongly
recommended to inspect the anodes every two (2)
years. If more than half of the anodes has been
consumed, they should be replaced. Instructions on
how to change the anodes can be obtained from the
manufacturer.
The longevity of the storage tank can be reduced
when a water softener is introduced to fight hard
water. Sodium salts added by a softener can make the
water extremely conductive; therefore, the anodes
are consumed at a faster rate. In such conditions, the
anodes should be inspected on a yearly basis.
In certain conditions, the anodes may react with the
water, producing discolored or smelly water. The
most common complaint is hot water that smells like
rotten eggs. This is the result of the reaction between
the anode and hydrogen sulphide gas dissolved in the
water, which is common in well systems. This issue
can usually be eliminated or reduced by changing the
magnesium anodes to aluminum anodes and by
chlorinating the storage tank and plumbing system. If
the problem continues, special filtration equipment
may be required. Under no circumstances are the
anodes to be removed from the water heater on a
permanent basis.
Removal of the anodes will lead to premature failure
of the water heater and will void the warranty.
Storage Tank
Drain a pail of water through the drain valve at least
once a year. This will remove excess sediment from
the bottom of the tank. This sediment, if allowed to
accumulate, will reduce the efficiency and the life of
the tank.
46
Draining the Storage Tank
To completely drain the storage tank:
1. Turn the power "OFF" to the system by unplugging
power to the system. (The system will not be fully
shut down by simply pressing the power button on
the controller)
2. Close the cold water supply manual shut-off valve.
3. Connect one end of a garden hose to the storage
tank drain valve and put the other end next to a
free-flowing drain.
4. Open the drain valve by turning the knob counter
clockwise
5. Open a hot water faucet to allow air into the
system.
Rinnai Commercial Hybrid System Installation and Operation Manual
Cold Water
Supply Valve
Drain Valve
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