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At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.
1.Seal any unused openings in the common venting system.
2.Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
3.Insofar as it is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common 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 operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
4.Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.
5.Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar or pipe.
6.After it has been determined that each appliance remaining connected to the common venting system 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.
7.Any improper operation of the common venting system should be corrected so that the installation conforms to the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Installation Codes. When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size
as determined using the appropriate tables and guidelines in the National Fuel Gas Code, ANSI Z223.1 NFPA 54 and/or CSA B149.1, Installation Codes.
Section 3
GAS SUPPLY AND PIPING
3.1Gas Supply and Piping
Gas piping should be supported by suitable
hangers or floor stands, not the appliance. Review the following instructions before
proceeding with the installation.
1.Verify that the appliance is fitted for the proper type of gas by checking the rating plate. Appliances are normally equipped to operate at elevations up to 2000 feet (610m). However, the appliance will function properly without the use of high altitude modification at elevations up to 10,000 feet (3050 m).
2.The maximum inlet gas pressure must not exceed 13" W.C. (3.2kPa). The minimum inlet natural gas pressure is 4" W.C. (1.0kPa) and minimum inlet propane gas pressure is 6" (1.5kPa).
3.Refer to Table 6, size supply.
4.Run gas supply line in accordance with all applicable codes.
Note: If you have a boiler/water heater with a normally open vent valve, install a vent line from the vent valve to an outside location as required by your installation code or IRI requirement. Do not remove 3/4 inch pipe plug from the vent valve if venting from the normally open vent valve is not required by your installation code.
5.Locate and install manual shutoff valves in accordance with state and local requirements.
6.A sediment trap must be provided upstream of the gas controls.
Size and |
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| Distance from Gas Meter or Last Stage Regulator |
|
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Gas Type | ||||||||
1200 natural | 2" | 5.1cm | 6.4cm | 6.4cm | 3" | 7.6cm | ||
1200 propane | 3.8cm | 2" | 5.1cm | 2" | 5.1cm | 6.4cm | ||
1600 natural | 6.4cm | 6.4cm | 3" | 7.6cm | 3" | 7.6cm | ||
1600 propane | 2" | 5.1cm | 2" | 5.1cm | 6.4cm | 6.4cm | ||
2000 natural | 3" | 7.6cm | 3" | 7.6cm | 3" | 7.6cm | 8.9cm | |
2000 propane | 6.4cm | 6.4cm | 6.4cm | 3" | 7.6cm | |||
2400 natural | 6.4cm | 3" | 7.6cm | 3" | 7.6cm | 8.9cm | ||
2400 propane | 2" | 5.1cm | 6.4cm | 6.4cm | 3" | 7.6cm | ||
Notes: 1. These figures are based on 1/2" 0.12kPa water column pressure drop.
2. Check supply pressure and local code requirements before proceeding with work.
3. Pipe fittings must be considered when determining gas pipe sizing.
Table 6. Gas Piping Sizes.