Troubleshooting guide

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34-55 08/14
WARNING: Do not combine appliances utilizing Category I or Category II venting into the same vent system
with appliances utilizing Category III or Category IV venting. This could cause unsafe operation and the
potential for poisonous carbon monoxide to enter occupied areas. Such improper installation can cause
property damage, personal injury, exposure to hazardous materials or death.
Conventional Venting Through the Wall Venting
7.3 CATEGORY III or IV VENTING
When properly installed with a UL, ULC, ETL or CSA listed, stainless steel, Category III or Category IV vent, the
appliance operates with a positive vent static pressure and with a vent gas temperature that avoids excessive
condensate production in the vent. Although the appliance can be installed to operate and require Category III
vent materials, Category IV vent materials can be substituted, but are not required.
The listed Category III or Category IV, stainless steel gas vent connected to this appliance may terminate either
above the roof surface or through the side wall. It must comply with the latest edition of the National Fuel Gas Code,
ANSI Z223.1 / NFPA 54 or, in Canada, CAN/CSA B149.1-10 Installation Codes, and the applicable provisions of the
local building codes.
• IMPORTANT: Do not use plastic venting of any type.
• Remove the vent increaser (if equipped) from the boiler vent connection. The Category III or IV venting systems
must connect directly to the 5-7/8 inch boiler vent connection and must not use the vent increaser as part of the
vent system.
• Obtain the correct adapter for attaching and sealing to the VT3 5-7/8 inch vent connection outlet from the
manufacturer of the listed Category III or IV venting system being installed. Attach this adapter to the VT3 vent
connection outlet following the instruction provided by the adapter’s manufacturer.
• Follow the Category III or Category IV vent manufacturers’ instruction for installation, sealing and support of their
vent system.
• For proper vent operation and to protect the gas vent from wind and weather, use ONLY the listed vent terminal
specified by the Category III or Category IV vent system manufacturer.
• IMPORTANT: Do not use a barometric damper when applying Category III or Category IV venting.
• This product uses the positive pressure generated by the burner system blower to push combustion products out
of the vent. The vent system must be a stainless steel and UL, ULC, ETL, or CSA certified for use with an
appliance requiring a Category III or Category IV, pressurized vent system. Seal all joints and support horizontal
lengths of vent and follow all installation instructions required by the vent manufacturer.
WARNING: Use only stainless steel venting listed by a nationally recognized testing laboratory for Category
III or Category IV, positive pressure, gas appliance venting. Use of plastic pipe of any type or use of venting
material other than specified in these instructions can result in failure of the venting system and/or exposure
to carbon monoxide, which can result in property damage, personal injury or death.
WARNING: When using Category III or Category IV venting, do not connect this appliance to an existing or
traditional gas vent or chimney or combine the vent with any other appliance, except as provided in Section
8.3.3 “Combining Category III or Category IV Vents.” Such venting could result in failure of the venting
system and/or exposure to carbon monoxide which can result in property damage, personal injury or death.