Requirements; Instruction Manual; Tools Required; Tools Optional - A.O. Smith SERIES 120 Service Handbook

REQUIREMENTS

INSTRUCTION MANUAL

Have a copy of the instruction manual that came with the water heater on hand for the
model being serviced. Instruction manuals can be obtained at the A. O. Smith web site
(www.hotwater.com) or by calling technical support at 800 527-1953.
Installation information given in this service manual is not a complete installation instruction.
Installation information covered in this service manual has a limited focus as it applies
to servicing the water heater. This Service Manual does not replace or supersede the
instruction manual that came with the water heater. Always refer to the instruction manual
that came with the water heater for complete installation instructions.

TOOLS REQUIRED

• Phillips head screwdriver
• standard screwdrivers
• 3/8 and 7/16 inch open end wrench
• set of marked drill bits
• electrical multimeter tester capable of measuring continuity, AC voltage, and DC voltage
• gas pressure gauge or manometer (gauge - AOS pt. no. 9005033105)
• water pressure gauge (AOS pt. no. 9004792105)
• thermometer (AOS pt no. 9005423105 - range 0 - 220 degrees F)
• 1/2 inch socket with extension for removal of the clean out cover
• 1-1/16 inch socket with extension for anode removal

TOOLS OPTIONAL

• Two digital manometers range -20.00 to +20.00" W.C., resolution 0.01" W.C.
Recommend UEI model EM200, TPI model 620 or equivalent.
REQUIREMENTS
Servicing should only be performed by a Qualifi ed Service Agent
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