John Wood Atmospheric Gas (Standard) - Manual (Page 24)

24
The following are typical (but not all) signs of a depleted
anode rod:
•
The majority of the rod’s diameter is less than 3/8”
(9.5 mm).
• 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 (18.9 L) of water
from tank. (Refer to
“Draining and Flushing” for
proper procedures). Close
drain valve.
4. Remove the 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 a nearby hot water
faucet to purge air from water system.
7. Check for any leaks and immediately correct any if found.
8. Restart the water heater as directed in this manual. See
the Repair Parts Illustration for anode rod location.
TEFLON ® is a registered trademark of E.I. Du Pont De Nemours and Company.
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. Turn off the gas to the water heater at the manual gas
shut-off valve.
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 the drain valve and terminate it to
an adequate drain or external to the building.
5. Open the water heater drain valve and allow all of the
water to drain from the tank. Flush the tank with water
as needed to remove sediment.
6. Close the drain valve, refill the tank, and restart the
water heater as directed in this manual.
If the water heater is going to be shut down for an
extended period, the drain valve should be left open.
IMPORTANT: Condensation may occur when refilling the
tank and should not be confused with a tank leak.
Routine Preventive Maintenance
At least annually, a visual inspection should be made of
the venting and air supply system, piping systems, main
burner, pilot burner, and flame-arrestor. Check the water
heater for the following:
•
Obstructions, damage, or deterioration in the venting
system. Make sure the ventilation and combustion air
supplies are not obstructed.
• Clean any dust or debris from the base-ring filter.
• Soot and/or carbon on the main burner and pilot
burner. Contact a qualified technician.
• Leaking or damaged water and gas piping.
• Presence of flammable or corrosive materials in the
installation area.
• Presence of combustible materials near the water heater.
• After servicing this water heater, check to make sure
it is working properly. (See “Operating Your Water
Heater” section of this manual.)
IMPORTANT: If you lack the necessary skills required to
properly perform this visual inspection, you should not
proceed, but get help from a qualified technician.
Temperature and Pressure Relief Valve
Explosion Harzard
‡ 7HPSHUDWXUHSUHVVXUHUHOLHI
YDOYHPXVWFRPSO\ZLWK$16,
=&6$DQG$60(
FRGH
‡ 3URSHUO\VL]HGWHPSHUDWXUH-
SUHVVXUHUHOLHIYDOYHPXVWEH
LQVWDOOHGLQRSHQLQJSURYLGHG
‡ 'RQRWSOXJEORFNRUFDSWKH
GLVFKDUJHOLQH
‡ )DLOXUHWRIROORZWKLVZDUQLQJ
FDQUHVXOWLQH[FHVVLYHWDQN
SUHVVXUHVHULRXVLQMXU\RU
GHDWK
Manually operate the temperature and pressure relief
valve at least once a year to make sure that it is working
EXPOSED
SUPPORT
WIRE
PITTED
ANODE
ROD
EXPOSED
SUPPORT
WIRE
FIGURE 18.