Raypak 300, 850 Common Venting, Model No, Vent Size, Volume of, Flue Products, inches

NOTE: When using PVC vent termination, insert the round stainless mesh screens provided with the unit into the tee and terminals.

CAUTION: A listed vent cap terminal suitable for connection to the Cat IV vent materials, adequately sized, must be used to evacuate the flue products from the boilers.

Common Venting

The NFGC does not address sizing guidelines for the common venting of multiple Category IV heaters. This is covered in the NFGC under “Engineered Vent Sys- tems”. Table M provides volumes of flue products at full fire for the calculation of appropriate vent and extractor sizing for common venting.

WARNING: Vent connectors serving any other appliances shall not be connected into any portion of mechanical draft systems operating under a positive pressure. If an XFyre boiler is installed to replace an existing boiler, the vent system MUST be verified to be of the correct size and of Category IV AL29-4C vent material or approved PVC/CPVC construction (in Canada, ULC-S636 approved plastic materials must be used). If it is NOT, it MUST be replaced.

NOTE: For extractor sizing, typical CO2 levels are 8.5% for natural gas and 9.5% for propane gas and flue temperatures of approximately 150°F.

At the time of removal of an existing boiler, the follow- ing steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remain- ing connected to the common venting system are not in operation:

(a)Seal any unused openings in the common venting system.

(b)Visually inspect the venting system for proper size and horizontal pitch and make sure there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

(c)As much as possible, close all building doors and windows and all doors between the space in which the appliances remaining connected to the com-

mon venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will oper- ate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

(d)Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.

(e)After it has been determined that each appliance remaining connected to the common venting sys- tem properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas burning appliance to their previous conditions of use.

(f)Any improper operation of the common venting system should be corrected so that the installation conforms with the latest edition of the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CSA B149. When re-sizing any portion of the common venting system, the common venting system should be re-sized to approach the minimum size as determined using the appropriate tables in Part 11 of the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CSA B149.

Model No.	Vent Size	Volume of
		Flue Products
	(inches)	(CFM)
300	4	80
500		130
850	6	220

NOTE: Data for 100% firing rate.

Table M: Volume of Flue Products Data

NOTE: Vent and intake piping must be supported so that the weight of the venting is not transfered to the unit. Horizontal runs of vent and intake piping must be supported to prevent sagging.

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