CT SERIES BOILERS - Columbia Heating

may be used in straight sections with a barometric draft regulator. Tees, however, shouldnot be used for a ninety-degree turn. Each joint should be securely fastened with sheetmetal screws. The flue pipe must not be inserted beyond the inside wall of the chimney.Columbia Boiler approves the use of galvanized “B” type vent that is suitable for 550°Fstack temperature as proper and safe for this application, but any and all codes take precedence.BOILERPROPER FLUEPIPE SIZECT-6 6"CT-10 6"CT-15 8"CT-20 8"CT-25 10"CT-35 12"CT-50 12"GAS SUPPLY PIPINGContact your local gas company to ensure that adequate gas service is available, and toreview applicable installation codes for your area.The minimum gas supply pressure required by the burner is five inches water column forthe CT-6 and CT-10, and seven inches water column for the CT-15, CT-20, CT-25, CT-35and CT-50. The maximum gas supply pressure to the burner is fourteen inches water column.Gas pressure greater than fourteen inches water column will require an additionalgas regulator to prevent damage to the primary gas regulator. Gas pressure below the minimumwill cause combustion efficiency problems and should be avoided if possible. Lowgas pressure may also prevent the boiler from obtaining the desired input rate, which willcause the boiler to be unable to produce the desired output. Consult the factory if your gassupply pressure is not in the recommended range.Use the following tables to determine the size of the main gas line required for the boilerthat is being installed. First determine the required input volume of gas needed at the gasmanifold, then determine the correct pipe size for the length of run needed.FM-148 COLUMBIA BOILER COMPANY, REV 6-06- 5 -