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TNR-I&S-02
ANODE INSPECTION AND REPLACEMENT
This water heater is equipped with multiple sacrificial anodes. Anodes
protect the glass-lined tank from corrosion by sacrificing themselves through
electrolysis. When the anode material is consumed, there is no more
protection and corrosion of the tank accelerates.
Inspection of the anode every 6 months allows you to identify the rate of
anode degradation. The anode should be replaced when its diameter is
3/8
of an inch, or annually which ever is first. Aggressive, very hot and
softened water causes rapid consumption of the anode requiring frequent
inspections. The replacement anodes rods are available from your local
distributor.
To inspect or replace an anode:
The anodes on this water heater are easily accessible from the top of the
water heater making replacement simple and quick. Use the following
procedure to remove and inspect the anodes.
1. Drain the heater. Refer to DRAINING THE WATER HEATER instructions
in this section.
2. Flush the heater. Refer to FLUSHING THE WATER HEATER instructions
in this section.
3. Remove the combustion surround top by unlatching.
4. Remove the second pass access cover. (If equipped)
5. Remove the second pass insulation.
6. Remove the second pass collector cover.
7. Remove the anode using a socket of the appropriate size. Sometimes
a breaker bar will need to be used.
DO NOT
use an impact wrench.
8. Inspect and replace the anode as required. Use pipe tape or sealant
when reinstalling the anode.
9. Close the drain valve. Open a hot water fixture to allow air to escape.
Open the cold water supply to water heater and allow the tank to fill.
Follow the lighting instructions.
10. Check your anode and drain valve for leaks.
11. Replace second pass collector cover. Make sure to clean off any
sealant and reseal before fastening.
12. Replace second pass insulation.
13. Replace second pass access cover.
14. Replace combustion surround top and latch it securely in place.
DRAIN VALVE AND TANK ACCESS PANEL
The water heaters are equipped with a ¾ inch drain valve. An access panel
covers the cleanout opening in the tank which is sealed by a gasket and
cover.
RELIEF VALVE
At least twice a year, the temperature and pressure relief valve should be
checked to ensure that it is in operating condition. To check the relief
valve, lift the lever at the end of the valve several times. The valve should
seat properly and operate freely.
If water does not flow, remove and inspect for obstructions or corrosion.
Replace with a new valve of the recommended size as necessary. A thorough
inspection of the valve should be performed at least every three years by
removing the temperature and relief valve from the tank. Do not attempt
to repair the valve, as this could result in improper operation and a tank
explosion. In areas with poor water conditions, it may be necessary to
inspect the T&P valve more often than the recommended maintenance
schedule.
If the temperature and pressure relief valve on the water heater discharges
periodically or continuously, it may be due to thermal expansion of water
in a closed water supply system, or, it may be due to a faulty relief valve.
Thermal expansion is the normal response of water when it is heated. In a
closed system, thermal expansion will cause the system pressure to build
until the relief valve actuation pressure is equaled. Then, the relief valve
will open, allowing some water to escape, slightly lowering the pressure.
Contact your water supplier or local plumbing inspector on how to control
this situation.
VENT AND AIR INTAKE SYSTEM
Examine the vent and air intake system every 3 months. Points of inspection
are as follows:
1. Check for obstructions and/or deterioration of vent piping and vent
terminal. Replace immediately where needed.
2. Vent pipe and vent hood screen should be cleaned of any foreign
material. The screen is located inside the vent hood outlet and is
accessible from the outside of the hood.
DO NOT
reach inside the
vent hood when the water heater is in operation.
3. Check all vent system connections for leakage and reseal as required.
COMBUSTION SYSTEM INSPECTION
Inspect the operation of the combustion system monthly. Use the following
procedure to inspect the combustion system.
1. Turn off the main power switch of the water heater.
2. Adjust the thermostat to the Min. setting.
3. Remove the top of the combustion surround by unlatching it.
4. While observing the ignition module, turn on the main power switch.
5. Adjust thermostat to the Max. setting.
6. Watch the LED’s light as the controller goes through the S-OP as
previously described.
7. Upon ignition, observe the main burner flame.
8. Readjust thermostat to previous setting.
9. Replace combustion surround top and latch it securely in place.
CAUTION
Before manually operating the valve, make sure that a drain line has
been attached to the valve to direct the discharge to an open drain.
Failure to take this precaution could mean contact with extremely hot
water passing out the valve during this checking operation.
WARNING
Above all, do not plug the temperature and pressure relief valve. This
is not a solution and can create a hazardous situation.
