Bradford-White Corp BWCV, BWCH warranty Common Vent Test Boilers, Vent Terminals for Outdoor Units

Page 12 BRADFORD WHITE CORP.

2.3.3 Vertical Vent Terminal

When the unit is vented through the roof, the vent must extend at least 3 feet (0.9m) above the point at which it penetrates the roof. It must extend at least 2 feet (0.6m) higher than any portion of a building within a horizontal distance of 10 feet (3.0m), and high enough above the roof line to prevent blockage from snow. When the combustion air is taken from the roof, the combustion air must terminate at least 12" (30cm) below the vent terminal (see Figure 2).

2.3.4Vertical Combustion Air Terminal

When combustion air is taken from the roof, a

field-supplied rain cap or an elbow arrangement must be used to prevent entry of rain water (see Figure 2). The opening on the end of the terminal must be at least 12" (30cm) above the point at which it penetrates the roof, and high enough above the roof line to prevent blockage from snow. When the vent terminates on the roof, the combustion air must terminate at least 12" (30cm) below the vent terminal.

2.4Common Vent Test — Boilers

When an existing boiler is removed from a

common venting system, the common venting system is likely to be too large for proper venting of the appliances remaining connected to it.

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 in Part II of the National Fuel Gas Code, ANSI Z223.1/ NFPA 54 and/or CSA B149.1, Installation Codes.

2.5Vent Terminals for Outdoor Units

For outdoor applications, the vent and

combustion air openings must be covered with proper terminals to prevent rain, snow and other objects from falling into the Copper Brute II.

If local codes allow, outdoor installations may use 1' of appropriately sized galvanized single wall or B-Vent and a rain cap for exhaust vent termination in the default configuration (venting out of the top). An appropriately sized galvanized 90° ell, positioned with the opening facing down, may be used on the combustion air inlet in the default configuration on the back of the unit. Note that some local codes may require a higher vertical vent height, extending above any perimeter fencing, etc. In installations where the appearance of the vent is objectionable, the low profile vent terminals in Table 6 may be used.

Part numbers for the low profile terminals to cover the vent and combustion air openings are shown in Table 6.

	OUTDOOR	OUTDOOR
SIZE	VENT	COMBUSTION
	TERMINAL	AIR TERMINAL
500	20254703	D2007900
750	20254705	D2007900
1000	20254705	D2008000
1250	D2007700	D2008000
1500	D2007700	D2008000
1750	D2007800	D2008000
2000	D2007800	D2008200

Table 6. Vent Terminals for Outdoor Units.