A.O. Smith BTX-80 Operation Manual page 19

SERVICE SHOULD BE PERFORMED ONLY BY A QUALIFIED
SERVICE TECHNICIAN. READ THE GENERAL SAFETY
INFORMATION SECTION FIRST.
USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS
COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE
GAS CARRYING COMPONENTS OF THIS APPLIANCE SHOULD
BE INSPECTED FOR PROPER OPERATION PERIODICALLY
BY A QUALIFIED SERVICE TECHNICIAN.
MAIN BURNER
Check main burner every 12 months for proper flame
characteristics. This is done by removing the outer door on heater,
Fig. 1. The main burner should provide complete combustion of
gas; ignite rapidly; give reasonably quiet operation; cause no
excessive flame lifting from burner ports. Make sure that the flow
of combustion and ventilation air is not blocked.
If proper flame characteristics are not evident, check for
accumulation of lint or other foreign material that restricts or blocks
the air openings in the heater or burner. Also check AIR
REQUIREMENTS.
SOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES
CORRECTION BEFORE FURTHER USE. Consult with a qualified
service technician.
Should the main burner or burner air openings require cleaning,
turn the control switch to "OFF" position and allow the burner to
cool. Remove the burner and clean with a soft brush. Clean
main burner orifice with a suitable soft material.
HIGH TEMPERATURE LIMIT SWITCH
(Auto Reset Type Energy Cut-Off)
TO RESET AUTOMATIC GAS SHUTOFF
This water heater is equipped with an automatic reset type high
limit (Energy Cutoff) sensor. The high limit switch interrupts the
main burner gas flow should the water temperature reach 205°F
(96°C). The high limit will automatically reset when the water
temperature drops below 140°F (60°C). After cooling the tank
temperature, turn off the water heater for at least 10 seconds by
using the switch on top of the unit. Turn on the water heater. If this
fails to correct the problem, contact your plumber or service
representative.
POWER VENTER MAINTENANCE
The unit must be inspected quarterly. Points of inspection are:
1. MOTOR - Motor must rotate freely. This is a sealed motor
and no oiling is required.
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 before operating.
3. The pressure switch part inside the power venter must be
open and free from deposits of soot, carbon, etc.
For safety and satisfactory operation it is recommended that the
heater be checked once a year by a competent service person.
WARNING
T & P VALVE
At least once a year, the temperature and pressure relief valve
must be checked to ensure that it is in operating condition. Lift
the lever at the top of the valve several times until the valve seats
properly and operates freely.
THE WATER PASSING OUT OF THE VALVE DURING THIS
CHECKING OPERATION MAY BE EXTREMELY HOT. AVOID
CONTACT AND DISCHARGE SAFELY TO PREVENT WATER
DAMAGE.
Periodically open the drain valve and allow the water to run until
it flows clean. This will help prevent sediment build-up in the
tank.
It is normal for lime and scale deposits to form within the tank and
on the heat exchanger surfaces. Such deposits will not be
removed by periodic draining. It is necessary to chemically delime
the affected parts in water areas where such deposits are
encountered. Contact your dealer or plumber for deliming
information.
If the heater is to be shut off and exposed to freezing temperatures,
it must be drained. Water, if left in the tank and allowed to freeze,
will damage the heater.
• Turn off the gas and cold water inlet valve to the heater.
• Open a nearby hot water faucet and the heater drain valve.
• BE CAREFUL TO GRASP THE DRAIN VALVE HANDLE SO
THAT THE HAND IS NOT EXPOSED TO HOT WATER. IF
DESIRED, A HOSE MAY BE CONNECTED TO THE DRAIN
VALVE TO CARRY THE WATER AWAY.
WARNING: The water CAN BE HOT.
The drain valve must be left open during the shutdown period.
• To restart heater, refer to the instructions under OPERATION.
CONDENSATE INSIDE TANK ASSEMBLY
Water vapor can condense on the cooler surfaces of the tank
forming droplets, these drip into the fire or run out on the floor.
This is common at the time of startup after installation, during
periods of time when incoming water is very cold, or the heater
may be undersized for the requirements.
Droplets from the bottom of the flue may be due to corrosive
combustion products or improper vent. Check with your dealer
for more information.
CATHODIC PROTECTION-ANODE
The anode rod is used to protect the tank from corrosion. Most
hot water tanks are equipped with an anode rod. The submerged
rod sacrifices itself to protect the tank. Instead of corroding the
tank, water ions attack and eat away the anode rod. This does
not affect the water's taste or color. The rod must be maintained
to keep the tank in operating condition.
19
WARNING
DRAINING