Introduction: Service Handbook Introduction - A.O. Smith 12 40GPC T 100 Service Handbook

Your safety and the safety of others is extremely important in the servicing of this water heater. Many
safety-related messages and instructions have been provided in this handbook and on the water heater
to warn you and others of a potential hazard. Read and obey all safety messages and instructions
throughout this handbook. It is very important that the meaning of each safety message is understood
by you and others who service this water heater.
The information contained in this handbook is designed to answer commonly faced situations encoun-
tered in the operation of the standard Residential Gas product line and is not meant to be all-inclusive.
If you are experiencing a problem not covered in this handbook, please contact the Technical Informa-
tion Center listed on the back of this handbook for further assistance. Additional information is also
available on the web site listed on the back of this handbook. This handbook is intended for use by
licensed plumbing professionals and reference should be made to the Installation Instructions and Use
& Care Guide accompanying the product. This handbook contains supplemental information to the
Installation Instructions and Use & Care Guide.
When servicing residential water heaters, it is essential that you return the unit to a safe condition
before you leave the site. All original components must be re-installed and all safety measures must be
implemented. In addition, the recommended water temperature setting is 120° F.
IMPORTANT: It is recommend that on every service call an inspection & cleaning of the air
intake chamber screen and combustion chamber and air diverter assembly be performed. See
page 24.
Tools Required (for servicing gas models):
• phillips head screw driver
• 3/8, 7/16, & 3/4 inch open end wrenches
• 3/16 inch Allen wrench
• 1-1/16 inch – 6 point – socket – for anode removal
• 5/16" nut driver
• pliers
• electrical multimeter (with alligator leads)
• digital or analog manometer
• gas pressure gauge
• Teflon ® tape
• hose – to drain tank
SERVICE HANDBOOK
Teflon is a registered trademark of E.I. Du Pont De Numours and Company.
®
Digital manometer shown.
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