American Water Heater GAS-FIRED COMMERCIAL WATER HEATER - Manual (Page 31)

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5. Annually remove the main burner rack assembly to clean orifices and
related parts of any dirt or other foreign material. Inspect the burner ports
for obstructions or debris and clean with a wire brush, vacuum, or use a
mild detergent solution to clean as needed. NOTE: It is imperative for
proper operation of the water heater that the main burner rack be
replaced in the original location.
7. At least once a year, check the combination temperature and pressure
relief valve to insure that the valve has not become encrusted with lime.
Lift the lever at the top of the valve several times until the valve seats
properly without leaking and operates freely.
8. Monthly drain off a gallon of water to remove silt and sediment.
9. If the combination temperature and pressure relief valve on the appliance
discharges periodically, this may be due to thermal expansion in a closed
water supply system. Contact the water supplier or local plumbing
inspector on how to correct this situation. Do not plug the combination
temperature and pressure relief valve outlet.
10. All models are equipped with a cleanout opening to aid in removal of hard
water deposits from the tank bottom. If this water heater operates under
hard water conditions, the following should be performed at least every 3
months: Drain the water heater. Remove the cleanout jacket cover and
tank cover. When cleaning the tank, care must be taken to avoid trying to
break deposits loose as this could damage the glass lining and shorten
the life of the water heater. After cleaning, replace the cleanout tank
cover and jacket cover, and refill with water.
11. A combination sacrificial anode rod/hot water outlet nipple has been
installed to extend tank life. The anode rod should be inspected
periodically (every 2 years) and replaced when necessary to prolong tank
life. Water conditions in your area will influence the time interval for
inspection and replacement of the anode rod. Contact the plumbing
professional who installed the water heater or the manufacturer listed on
the rating plate for anode replacement information. The use of a water
softener may increase the speed of anode consumption. More frequent
inspection of the anode is needed when using softened (or phosphate
treated) water.
WARNING
When lifting lever of the combination temperature and pressure relief
valve, hot water will be released under pressure. Be careful that any
released water does not result in bodily injury or property damage.
WARNING! THIS WATER MAY BE HOT.
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