John Wood Envirosense Power Vent - Manual (Page 29)

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INSTALLED IN SUITABLE AREA: To insure sufficient ventilation
and combustion air supply, proper clearances from the water heater
must be maintained. See “Locating the New Water Heater” section.
Combustible materials such as clothing, cleaning materials, or
flammable liquids, etc. must not be placed against or adjacent to
the water heater which can cause a fire.
anode rod InspectIon
Each water heater contains at least one anode rod, which will slowly
deplete (due to electrolysis) prolonging the life of the water heater by
protecting the glass-lined tank from corrosion. Adverse water quality,
hotter water temperatures, high hot water usage, and water softening
methods can increase the rate of anode rod depletion. Once the anode rod
is depleted, the tank will start to corrode, eventually developing a leak.
Certain water conditions will cause a reaction between the anode rod
and the water. The most common complaint associated with the anode
rod is a “rotten egg smell” produced from the presence of hydrogen
sulfide gas dissolved in the water. IMPORTANT: Do not remove this
rod permanently as it will void any warranties. The parts list includes a
special anode rod that can be ordered if water odor or discoloration occurs.
NOTE: This rod may reduce but not eliminate water odor problems. The
water supply system may require special filtration equipment from a water
conditioning company to successfully eliminate all water odor problems.
Artificially softened water is exceedingly corrosive because the
process substitutes sodium ions for magnesium and calcium ions.
The use of a water softener may decrease the life of the water
heater tank.
The anode rod should be removed from the water heater tank every
3 years for inspection. NOTE: artificially softened water requires the
anode rod to be inspected annually.
The following are typical (but not all) signs of a depleted anode rod:
* The majority of the rods diameter is less than 3/8”.
* Significant sections of the support wire (approx. 1/3 or more of the
anode rod’s length) are visible.
If the anode rod show signs of either or both it should be replaced.
NOTE: Whether re-installing or replacing the anode rod, check for
any leaks and immediately correct if found.
In replacing the anode:
1. Turn off gas supply to the water heater.
2. Shut off the water supply and open a nearby hot water faucet to
depressurize the water tank.
3. Drain approximately 5 gallons of water from tank (Refer to “Draining
and Flushing” for proper procedures). Close drain valve.
4. Remove old anode rod.
5. Use Teflon® tape or approved pipe sealant on threads and install
new anode rod.
6. Turn on water supply and open nearby hot water faucet to purge air
from water system. Check for any leaks and immediately correct
any if found.
Restart the water heater as directed under “Operating Your Water
Heater.” See the Repair Parts Illustration for anode rod location.
fIGure a. anode rod depletIon.
teMperature-pressure relIef valve operatIon
The temperature-pressure relief valve must be manually operated
at least once a year.
fIGure 22.
When checking the temperature-pressure relief valve operation,
make sure that (1) no one is in front of or around the outlet of
the temperature-pressure relief valve discharge line, and (2) that
the water discharge will not cause any property damage, as the
water may be extremely hot, see Figure 22.
If after manually operating the valve, it fails to completely reset
and continues to release water, immediately close the cold water
inlet to the water heater, follow the draining instructions, and
replace the temperature-pressure relief valve with a new one.
If the temperature-pressure relief valve on the appliance weeps
or discharges periodically, this may be due to thermal expansion.
You may have a check valve installed in the water line or a water
meter with a check valve. Consult your local water supplier
or service agency for further information. Do not plug the
temperature-pressure relief valve.
draInInG and flushInG
It is recommended that the tank be drained and flushed every 6
months to remove sediment which may build up during operation.
the water heater should be drained if being shut down during freezing
temperatures. To drain the tank, perform the following steps:
1. Set the blower switch to the “OFF” position.
2. Open a nearby hot water faucet until the water is no longer hot.
3. Close the cold water inlet valve.
4. Connect a hose to drain valve and terminate to an adequate
drain or external to the building.
5. OPEN water heater drain valve and allow all of the water to drain
from tank. Flush tank with water as needed to remove sediment.
6. CLOSE the drain valve, refill the tank, and restart the heater as
directed in this manual.
7. If the water heater is going to be shut down for an extended
period, the drain valve should be left open.
8. IMPORTANT: Condensation may occur when refilling the tank
and should not be confused with a tank leak.