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VF BOILER SERVICE MANUAL
AOS WPC - Tech Training 2 of 72 Ashland City, TN © 2007
Servicing should only be performed by a Qualified Service Agent
INTRODUCTION
This Service Manual is designed to aid in servicing and troubleshooting A. O. Smith VF
boilers. Models VW/VB 500 - 1000 - series 100/101 boilers are covered in this manual.
The instructions and illustrations contained in this service manual will provide you with
troubleshooting procedures to verify proper operation and diagnose and repair common
service problems.
Important Service Reminder
When performing any troubleshooting step outlined in this service manual always consider
the wiring and connectors between components. Perform a close visual inspection of all
wiring and connectors to and from a given component before replacement. Ensure wires
were stripped before being crimped in a wire connector, ensure wires are crimped tightly in
their connectors, ensure connection pins in sockets and plugs are not damaged or worn,
ensure plugs and sockets are mating properly and providing good contact.
Failure to perform this critical step or failing to perform this step thoroughly often results in
needless down time, unnecessary parts replacement, and customer dissatisfaction.
Instruction Manual
Have a copy of the Instruction Manual that came with the boiler on hand for the model and
series number before servicing.
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 boiler. This Service Manual does not replace or supersede the Instruction
Manual that came with the boiler. Always refer to the Instruction Manual that came with the
boiler for complete installation instructions.
Qualifications
Service of A. O. Smith VF boilers requires ability equivalent to that of a Qualified Service
Agent (defined by ANSI below) in the field involved. Installation skills such as plumbing, air
supply, venting, gas supply, electrical supply are required in addition to electrical testing
skills. Start up and servicing of VF boilers requires combustion analysis test equipment.
ANSI Z223.1 2006 Sec. 3.3.83: “Qualified Agency” - “Any individual, firm, corporation or
company that either in person or through a representative is engaged in and is responsible
for (a) the installation, testing or replacement of gas piping or (b) the connection, installation,
testing, repair or servicing of appliances and equipment; that is experienced in such work;
that is familiar with all precautions required; and that has complied with all the requirements
of the authority having jurisdiction.”
Service Warning
If you are not licensed or certified to perform a given task do not attempt to perform any of
the service or installation procedures outlined in this manual. If you do not understand the
instructions given in this manual or do not feel confident in your abilities to perform a given
task do not attempt to perform any procedures outlined in this manual.