Raypak XFyre 300A Installation & Operating Instructions Manual

TerminationThe vent terminal should be vertical and should termi-nate outside the building at least 2 ft above the highestpoint of the roof that is within 10 ft. The vent capshould have a minimum clearance of 4 ft horizontallyfrom and in no case above or below (unless a 4 ft hori-zontal distance is maintained) electric meters, gasmeters, regulators and relief equipment.The distance of the vent terminal from adjacent publicwalkways, adjacent buildings, open windows andbuilding openings must be consistent with the NFGC(U.S.) or B149 (Canada). Vents supported only byflashing and extending above the roof more than 5 ftshould be securely guyed or braced to withstand snowand wind loads.Common VentingThe NFGC does not address sizing guidelines for thecommon venting of multiple Category IV heaters. Thisis covered in the NFGC under “Engineered Vent Sys-tems”. Table N provides volumes of flue products at fullfire for the calculation of appropriate vent and extrac-tor sizing for common venting.NOTE: A vent adapter (field-supplied) may be re-quired to connect the Category IV vent to the boiler.WARNING: Vent connectors serving any otherappliances shall not be connected into any portion ofmechanical draft systems operating under a positivepressure. If an XFyre boiler is installed to replace anexisting boiler, the vent system MUST be verified tobe of the correct size and of Category IV AL29-4Cvent material, approved PVC/CPVC construction, orCentrotherm™ polypropylene (in Canada, ULC-S636 approved plastic materials must be used). If itis NOT, it MUST be replaced.NOTE: For extractor sizing, typical CO2 levels are8.5% for natural gas and 9.5% for propane gas andflue temperatures of less than 220°F.NOTE: Data for 100% firing rate.Table N: Volume of Flue Products DataCAUTION: A listed vent cap terminal suitable forconnection to the Cat IV vent materials, adequatelysized, must be used to evacuate the flue productsfrom the boilers.Model No. Vent Size(inches)Volume of FlueProducts (CFM)300A490400A 120500A 150700A 6 210850A 250At the time of removal of an existing boiler, the follow-ing steps shall be followed with each applianceremaining connected to the common venting systemplaced in operation, while the other appliances remain-ing connected to the common venting system are notin operation:(a) Seal any unused openings in the common ventingsystem.(b) Visually inspect the venting system for proper sizeand horizontal pitch and make sure there is noblockage or restriction, leakage, corrosion andother deficiencies which could cause an unsafecondition.(c) Place in operation the appliance being inspected.Follow the lighting instructions. Adjust thermostatso appliance will operate continuously.NOTE: Vent and intake piping must be supported sothat the weight of the venting is not transfered to theunit. Horizontal runs of vent and intake piping mustbe supported to prevent sagging.NOTE: When using PVC “T” vent as termination,insert the round stainless mesh screens providedwith the unit into the tee ends.The minimum flue pipe diameter for conventional vent-ing is: 4 in. (102mm) for Models 300A, 400A and 500A,and 6 in. (152mm) for Models 700A and 850A.The connection from the appliance vent to the stackmust be as direct as possible and shall be the same di-ameter as the vent outlet. The horizontal breaching ofa vent must have an upward slope of not less than 1/4inch per linear foot from the heater to the vent termi-nal. The horizontal portions of the vent shall also besupported for the design and weight of the materialemployed to maintain clearances and to prevent physi-cal damage or separation of joints.NOTE: When using Centrotherm™Polypropylene “T” vent termination, insert twoCentrotherm™ termination screens into the teeends.29