Bock Water heaters EZ 100-199, Инструкция по установке и эксплуатации

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Page 12 Atmospheric Gas
MAINTENANCE
Notice to the Owner: If you are having a mechanical problem with your water heater, con-
tact your service company or installer.
Lime and Sediment: A program of regular maintenance should be established to keep your
water heater operating at peak efficiency. Important: The tank can fail prematurely from
an accumulation of lime and sediment in the bottom, excessive pressure and/or
corrosion.
Prevention of these damaging factors will extend the life of your water heater
appreciably.
All Bock atmospheric gas water heaters have hand holes that permit the visual inspection of
the tank interior for lime. The hand hole is large enough to reach in and loosen such deposits
by brushing or scraping. A commercial lime dissolving chemical can also be employed. The
loosened residue can be flushed away through the hand hole or drain.
These accumulations can be controlled to an extent by softening the water or using other scale
reducing water treatment systems. The tank should be inspected every six months: Turn off
gas and electrical power, drain, remove the hand hole cover and make a visual check of the
tank interior. If lime (or sediment) has accumulated, remove with a commercial lime dissolv-
ing chemical or scrape loose the deposit and flush it away through the hand hole or drain.
Excessive pressure is controlled by the pressure relief valve. Water expands when heated and
the extra volume must have a place to go. If water cannot expand into the cold water line
because of a check valve or pressure regulator, pressure builds as the water heats. The pressure
relief valve opens and dumps the extra water. If the relief valve is faulty, or none has been
installed, the tank can fail due to excessive pressure. Open the relief valve at least once a
year to make sure the seat is not stuck.
CAUTION
Before opening the relief valve, be certain that the discharge line directs the flow of
water to the drain. Stand away from the outlet to avoid contact with the water.
Anode rods are installed in the head of the tank to help prevent corrosion. When inspecting
the tank interior for lime or sediment accumulations, also inspect the condition of the anode
rods. When the diameter of either rod has eroded to about
2
⁄
3
of its original diameter
(original=0.90”), it must be replaced.
Electrolysis can be reduced by installing dielectric connections on the cold water inlet and hot
water outlet.
The vent system should be checked at least once a year for damage and/or blockage. Also
check for correct draft and damper operation.
If the water heater is to be shut off during cold weather, the tank and water lines should be
drained to prevent freezing.
The water heater warranty will be invalid if the tank fails due to excessive pressure, the accu-
mulation of lime or sediment, corrosion, or freezing. The warranty explicitly documents
further causes of invalidation.
If necessary, the water heater flue may be cleaned with a brush or a flexible wire. Before pro-
ceeding:
•
Turn the gas valve to OFF.
• Wait at least 5 minutes for the combustion chamber and flue to cool.
• Use a brush or flexible wire to clean the flue. This can be done through the top of the flue.
It is not necessary to remove the burner or baffle.
• Slide the flexible wire or brush down the flue at the base of each row of fins. This should
knock any rust flakes into the combustion chamber for removal.
WARNING
If the flue is blocked with soot this indicates serious combustion problems related to the
building and/or installation. These must be addressed before placing the water heater back
in operation.
• Vacuum or sweep out any sediment collected in the combustion chamber before restarting
the heater. This can be done through the chamber inspection port.