John Wood FlowTHRU Storage Tanks - Manual (Page 7)

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1. Turn "OFF" the electrical supply to the tank.
2. Close the cold water supply valve.
3. Open a nearby hot water faucet served by the system.
4. Connect a hose to the drain valve and route it to an
adequate drain.
5. Open the drain valve and allow all the water to drain
from the tank.
6. Open the cold water supply valve and flush the tank as
needed to remove sediment and any other foreign mat-
ter that may have entered the system. Close the cold
water supply valve when clean water flows.
7. Perform any other servicing as required.
8. Close the drain valve, disconnect hose and refill the
tank (see “Filling” section). If the water heater is going
to be shut down for an extended period, the drain valve
should be left open.
9. Turn "ON" the electrical supply to the tank.
Water Odor/Sacrificial Anode
Your storage tank has been equipped with one magnesium
anode that will slowly deplete while protecting the glass-
lined tank thus prolonging its life. Certain water conditions
may cause a reaction between the anode and the water.
The most common complaint associated with the anode is
a “rotten egg smell” produced by the presence of sulfur. Do
not remove this anode permanently as it will void any
warranties, stated or implied. An aluminum anode may
reduce if not eliminate water odor problems. The water sup-
ply system may require special filtration equipment from a
water conditioning company to successfully eliminate all
water odor problems. Artificially softened water is exceed-
ingly corrosive because the process substitutes sodium ions
for magnesium and calcium ions. The use of a water sof-
tener may decrease the life of the water heater tank. The
anode should be inspected periodically. If the anode is more
than 50% depleted, the anode should be replaced.
Anode Maintenance
1. Turn "OFF" the electrical supply to the tank.
2. Close the cold water supply valve.
3. Open a nearby hot water faucet served by the system
to depressurize the system.
4. Connect a hose to the drain valve and drain 22 litres (6
gal.) as directed in the “Draining and Flushing” section.
5. Using an adjustable pipe wrench, remove the anode
and inspect it. The surface may be rough, full of pits and
crevices, but this is normal. If it is less than approxi-
mately 6mm (1/4 in.) in diameter, or the inner steel core
is exposed, the anode should be replaced.
6. Apply Teflon TM tape or sealing compounds approved for
use with potable water, to the threads of the anode and
install into the tank top.
7. Open the cold water supply valve and open a nearby
hot water faucet to purge air from the tank as directed
in the “Filling” section.
8. Check for leaks, repair as required, and re-test.
9. Turn "ON" the electrical supply to the tank.
CAUTION
Hydrogen gas can be produced in a hot water system
served by this storage tank that has not been used for a
long period of time (generally two (2) weeks or more).
Hydrogen gas is extremely flammable and can ignite
when exposed to a spark or flame. To reduce the risk of
injury under these conditions, it is recommended that the
hot water faucet be opened for several minutes at the
kitchen sink before using any electrical appliance con-
nected to the hot water system. Use caution in opening
faucets. If hydrogen is present, there will probably be an
unusual sound such as air escaping through the pipe as
the water begins to flow. There should be no smoking or
open flame near the faucet at the time it is open.