Bradford White M-I-MH40T6FLX - Manual (Page 23)

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Maintenance continued-
5. Annually remove the inner door and main burner 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 as
needed. Wire brush and/or vacuum clean the combustion chamber as
needed to remove scale deposits and debris. Note: It is imperative for
proper operation of the water heater that the inner door be replaced in the
original location.
6. 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 lever at the top of the valve several times until the valve
seats properly without leaking and operates freely.
7. Monthly drain off a gallon of water to remove silt and sediment.
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.
8. 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.
9. 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.
10. The vent system must be inspected at least once a year to ensure against
leakage of exhaust products.
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