State SBB75 76NE - Manual (Page 13)

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 from the manufacturer,
authorized service agencies or distributors. When ordering parts
be sure to have the complete water heater Model Number, Serial
Number and Series Number available. This information can be
found on the rating label affixed to the water heater. Refer to the
parts list included with the water heater from the factory for more
information or call the parts department or technical support phone
number listed on the back cover of this manual for further assistance.
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.
UN•LIME ® and the booklet may be obtained through your dealer
or distributor.
DELIMING SOLVENTS
UN•LIME is recommended 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 water heater
manufacturer. Order Part Number 9005416105, 1 gallon, packed 4
gallons per case or Part Number 9005417105, 5 gallon container.
NOTE: Un•Lime is not available for use in Canada. Hydrochloric base
acids are not recommended for use on glass-lined tanks.
CAUTION
Observe handling instructions on label of product being used.