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RESIDENTIAL GAS, NON POWER VENTED, WATER HEATER
If there has been a flammable vapor ignition, a qualified service agent needs to inspect
the arrestor for cracks. The arrestor is not a replaceable part – the heater would need to
be replaced.
Possible service issues associated with the flame arrestor.
•
Poor combustion – yellow flame, sooting, possible carbon monoxide production.
•
Pilot outage due to lack of oxygen. Continued pilot outage or finding that the LDO
screen(s) is heavily blocked would warrant inspection of the flame arrestor.
•
Pilot outage due to increased combustion chamber temperatures below the main burner.
This may open the automatic reset, thermal cut off switch (TCO).
•
The flame arrestor having contained a flammable vapor ignition. The TCO will open and
the chamber and arrestor should be inspected by a qualified service agent.
COMBUSTION CHAMBER TEMPERATURE SENSOR
The C3 Technology water heaters will come equipped with a thermal cutoff (TCO)
device that is integral with the thermocouple. Temperature cutoff points range from
160°C to 200°C depending on model. The TCO is an automatic reset thermal switch.
When activated it will open the thermocouple circuit and shut off the main and pilot
burner gas flow. The pilot would have to be relit after the TCO has had sufficient time to
cool down (sensor is below 120 degrees F).
In addition to printing the temperature setting on the TCO, a label located near the gas
valve attachment end of the thermocouple notes the temperature setting of the TCO.
The TCO performs two primary functions:
•
In the event of flammable vapor ignition inside the combustion chamber, it
senses the corresponding increase in temperature and shuts off gas flow to the
main and pilot burners.
•
If excessive temperatures inside the combustion chamber indicate poor
combustion due to a clogged LDO screen or inadequate air for combustion, the
TCO will shut off gas flow to the main and pilot burners.
State Water Heater
© 2004
SERVICE HANDBOOK
18
Technical Training Department
Ashland city, TN
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