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RESIDENTIAL GAS, NON POWER VENTED, WATER HEATER
SERVICE HANDBOOK
State Water Heater Technical Training Department
© 2004 Ashland city, TN
16
IMPLEMENTATION
CATEGORY
ANTICIPATED
INTRODUCTION
CLASS OF PRODUCTS
INCLUDED IN THIS CATEGORY
Phase I
July 1, 2003
(July 1, 2004* Can.)
30, 40, and 50 gallon atmospheric vented.
(Manufactured housing models are excluded.)
Phase II January 1, 2005*
30, 40, and 50 gallon power-vented models.
(Manufactured housing models are excluded.)
Phase III July 1, 2005*
All other gas-fired models with inputs of 75,000 BTU
or less.
* Subject to change. This supplement addresses the July1, 2003 compliant products.
In addition to the standard water heater design discussed in the main service handbook, the C3
Technology design also includes:
A LDO (Lint Dust and Oil) screen over the combustion air intake
A Flame Arrestor
A combustion chamber Thermal Cut Off (TCO) limit
An additional tool for these products might be a vacuum cleaner with both blowing and
vacuuming capabilities. Also include the long, narrow crevice accessory.
LDO SCREEN (LINT, DUST, OIL) SCREEN(S)
An easy to clean screen designed to minimize lint, dust and oil based contaminants from being
drawn into the “Flame Arrestor” along with make up – combustion - air. There may be one or
two of these screens. The LDO screen must be installed with the arrows on the right and left
side facing up to function properly. (The arrows are located on two mounting tabs on each side
of the screen).
Service:
Inspect the LDO screen(s) regularly. Clean or wash as necessary.
Pulling the tab located in the middle of the screen will remove the screen. Reinstall the clean
screen by inserting the end tabs into the jack with the arrows pointing up.
Possible Service issues associated with a blocked screen:
Poor combustion – yellow flame, possible sooting
Pilot outage resulting from a lack of oxygen
Pilot outage resulting from to increased combustion chamber temperature below the
main burner. This may open the automatic reset, thermal cut off switch (TCO).