Internet Version for Reference Only
Page 8 | Bradford White |
|
|
|
|
2.2 Venting
2.2.1 Vent Categories
Depending upon desired Copper Brute II venting, it may be considered a Category I or a Category III appliance. In general, a vertical vent system will
be a Category I system. However, in rare instances, a Copper Brute II vertical vent system may be considered Category III. In the U.S., the National Fuel Gas Code (ANSI
I vent system, and includes rules and tables to size these vent systems. If the Copper Brute II vertical vent system does not satisfy the criteria for Category I venting, it must be vented as a Category III system.
All Copper Brute II vent systems which discharge horizontally (without the use of a power venter) are considered Category III vent systems.
2.2.2 Category I Vent
When vented as a category I appliance, the vent system must conform to the National Fuel Gas Code (ANSI
If chimney height is greater than 25 feet, or if multiple units are vented into the same vertical vent, a barometric damper must be installed on each appliance, such that the flue draft does not exceed (negative) 0.1" w.c.
If using a power venter for any type of Category I venting, the draft should be set between (negative) 0.01 and 0.10" w.c.
2.2.3Common Venting Systems
Copper Brute II heaters are Category I fan-
assisted when vented vertically and adhering to all applicable codes. Copper Brute II heaters are not allowed to be vented into a common horizontal vent system, unless a properly sized vent fan is used, and the common vent system is properly designed by the vent fan manufacturer or a qualified engineer. When common venting Copper Brute II
If the appliances are allowed to operate in this condition, serious injury or death may occur.
WARNING
Operation of appliances with a blocked common vent may lead to serious injury or death. Safety devices must be implemented to prevent blocked common vent operation. If safe operation of all appliances connected to a common vent cannot be assured, including prevention of spillage of flue gasses into living spaces, common venting should not be applied, and appliances should each be vented separately.
It is for this reason that, in addition to following proper vent sizing, construction and safety requirements from the National Fuel Gas Code, ANSI Z223.1 or in Canada, from CSA B149.1 as well as all applicable local codes, it is required that installers provide some means to prevent operation with a blocked common vent. It is suggested that a blocked vent safety system be employed such that if the switch from one appliance trips due to excessive stack spill or back pressure indicating a blocked vent condition, that all appliances attached to the vent be locked out and prevented from operating. Note that the Copper Brute II is equipped with a blocked vent safety (pressure) switch, as shipped. However, this safety switch has only been designed and tested to be effective in installations where the Copper Brute II is vented separately and NOT common vented with other appliances. As an additional precaution, it is recommended that a Carbon Monoxide (CO) alarm be installed in all enclosed spaces containing combustion appliances. If assistance is required in determining how a blocked vent safety system should be connected to a Bradford White product, please call the Bradford White Service Department at (800)
2.2.4 Category III Vent
When the Copper Brute II is vented with horizontal discharge, it must be installed per this installation manual and the venting system manufacturer’s installation instructions. The vent system must be sealed stainless steel, per Table 5.
Route the vent pipe to the heater as directly as possible. Seal all joints and provide adequate hangers as required in the venting system manufacturer’s Installation Instructions. Horizontal portions of the venting system must be supported to prevent sagging and may not have any low sections that could trap condensate. The unit must not support the weight of
