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SlimFit
Series 2
®
Venting/combustion air — options (Category II)
Improper Installation of a Category II vent system resulting in positive pressure in the vent sys-
tem can result in flue gas spillage and carbon monoxide emissions, causing severe personal
injury or death.
Weil-McLain recommends the use of a Variable Speed Chimney Fan / Power venter to ensure
that the appropriate negative pressure range is kept for Category II venting. The reason this
may be needed is due to the higher efficiency of the SlimFit boiler. The exhaust gas tempera-
tures are lower which result in less draft when using a chimney fan/power venter. A flow prov-
ing switch should be wired into the LCI circuit on the boiler. The use of this device should be
considered in any engineered vent system in accordance to local authority having jurisdiction.
Weil-McLain recommends the use of a Double Acting Barometric Damper or Modulating
Damper to ensure the appropriate negative pressure range is kept for Category II venting. The
use of this device should be considered in any engineered vent system in accordance to local
authority having jurisdiction.
When using a damper of any kind, it is recommended to use a thermal spill switch to detect
any exhaust flow into the boiler room. Verify the temperature range on the thermal spill switch
is adequate for the Flue gas temperature from the SlimFit boiler. The use and set-point of this
shall be determined by the system designer in accordance to local authority having jurisdiction.
Code Compliance
Venting / Combustion air piping – Installations must provide provisions for combustion and
ventilation air in accordance with the section "Venting of Equipment", of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, or "Venting Systems and Air Supply for appliances" of the
Natural Gas and Propane Installation Code, CAN/CSA B149.1, or applicable provisions of the
local building codes.
28
commercial condensing gas
— Boiler Manual
-
fired water boiler
Part number 550-100-561/0224
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