Weil-McLain SVF 725 Application Manual

Common Venting methods and requirements for SVF Boilers (SVF 725/850)
The SVF boiler can be common vented when the following requirements are met.
• Common venting of the SVF boiler can only be done in a Category II vent system. All requirements for
the SVF boiler to be vented in a Category II configuration must be met as stated in the SVF Boiler Manual
or all subsequent addenda.
• SVF boilers can only be common vented with other SVF Boilers.
• The maximum number of SVF boilers to be common vented together is four.
• The Vent system for a Category II SVF boiler is considered a Designed / Engineered vent system and
should be designed by a professional using accepted engineering practices.
• Vertical Vent only.
• Combustion air must come from the boiler room. See Direct Exhaust – Room Air Openings requirements
in the SVF Boiler Manual.
• Must increase venting to 8" using a 6" to 8" bell reducer at boiler vent adapter for Category II Vent Connection.
Hazard Definitions
The following defined terms are used throughout these Instructions to bring attention to the presence of
hazards of various risk levels or to important information concerning the life of the product.
WARNING
!
Warning indicates the presence of hazards that can result in severe personal injury, death, or
substantial property damage.
IMPORTANT
Important indicates additional information that is important, but is not related to personal injury or property damage.
Application Guide
Common Venting SVF Boilers
Commercial Condensing
Gas-Fired Water Boilers
for
Models 725/850
(continued on the next page)
Manual Part Number 550-100-296/0123