13
BLOWER MAINTENANCE
For safety and satisfactory operation it is recommended that the blower be
checked once a year by a competent service person.
1. MOTOR - The motor is factory oiled and sealed and requires no further
maintenance.
2. WHEEL - Wheel must be clean of soot, ash or any other coating which
inhibits either rotation or air flow. Remove all foreign material from
vent system.
3. The pressure switch is inside the blower control box and is connected
to the blower housing with a tube. This tubing should be soft and
pliable and show no sign of deterioration.
RELIEF VALVE
At least once a year the temperature and pressure relief valve should be
checked to ensure that it is in operating condition. (During manual operation
of this valve, avoid any contact with hot water and take preventive steps for
water damage). Lift the lever at the top of the valve several times until the
valve seats properly and operates freely.
WARNING
THE WATER PASSING OUT OF THE VALVE DURING THIS CHECKING
OPERATION MAY BE EXTREMELY HOT. AVOID CONTACT AND
DISCHARGE SAFELY TO PREVENT WATER DAMAGE.
If the temperature and pressure relief valve on the heater discharges
periodically or continuously, a problem exists. This may be due to unusually
high water temperatures or pressures in the system, or to a faulty relief
valve. Contact your dealer or a qualified service technician to find the
cause of the problem and to correct it. This may also 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 TEMPERATURE AND PRESSURE RELIEF VALVE.
WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT
OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE
APPLIANCE.
HOT WATER ODOR
On occasion, hot water may develop a strong odor. If this occurs drain the
heater completely, flush thoroughly, and refill. If the problem persists,
chlorination of the heater and replacement of the factory installed magnesium
anode with aluminum anode may correct the condition.
Occasionally water softener companies recommend removal of heater
anodes for odor reasons.
CAUTION
Unauthorized removal of heater anode will void the warranty. Replace the
anode as necessary to maintain corrosion protection. For further information
contact your dealer.
WINTER PROTECTION
In regions where freezing weather is encountered, all water must be
drained from unit and piping when out of service (water shut off). Drain
valve must be left open until unit is returned to service.
REPLACEMENT PARTS
Replacement parts may be ordered through A. O. Smith dealers, authorized
servicers or distributors. Refer to the Yellow Pages for where to call or
contact the A. O. Smith Water Products Company, 5621 West 115th Street,
Alsip, Illinois 60803, 1-800-433-2545. In Canada contact A.O. Smith
Enterprises Ltd., P.O. Box, 310-768 Erie Street, Stratford, Ontario N5A 6T3,
1-800-265-8520. When ordering parts, be sure to state the quantity, part
number and description of the item including the complete model and serial
number as it appears on the product. Refer to the parts list for more
information.
PREVENTIVE MAINTENANCE
RECOMMENDED PROCEDURE FOR PERIODIC REMOVAL
OF LIME DEPOSITS FROM TANK TYPE COMMERCIAL
WATER HEATERS
FIGURE 8
The amount of calcium carbonate (lime) released from water is in direct
proportion to water temperature and usage, see chart. The higher the
water temperature or water usage, the more lime deposits are dropped out
of the water. This is the lime scale which forms in pipes, heaters and on
cooking utensils.
Lime accumulation not only reduces the life of the equipment but also
reduces efficiency of the heater and increases fuel consumption.
The usage of water softening equipment greatly reduces the hardness of
the water. However, this equipment does not always remove all of the
hardness (lime). For this reason it is recommended that a regular schedule
for deliming be maintained.
The time between cleaning will vary from weeks to months depending upon
water conditions and usage.
Refer to A. O. Smith booklet, Form No. 4800, entitled “Why? When and
How” for detailed description on tank inspection and cleanout.
UN•LIME
®
and the booklet may be obtained through your A. O. Smith dealer
or distributor.
DELIMING SOLVENTS
A. O. Smith recommends the use of UN•LIME for deliming. UN•LIME is a
patented food grade acid which is safe to handle and does not create the
harmful fumes which are associated with other products.
UN•LIME may be obtained from your dealer, distributor or the A. O. Smith
Product Service Division. Order part no. 4763 (1 gal), packed 4 gallons
per case or part no. 4813 (5 gallon container).
Hydrochloric base acids are not recommended for use on glass-lined tanks.
CAUTION
Observe handling instructions on label of product being used.