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the vent pipe. Horizontal runs must slope downwards not less than 1⁄4 inch per foot (2 cm/m) from the unit to the vent terminal. Reference Table 1 for the size of the Category III vent system. Up to three elbows can be used with 50 linear feet (15.2m) of pipe. Subtract 10 allowable linear feet (3.0m) for every additional elbow used.
Term | Description |
Pipe | Must comply with UL Standard 1738 |
| such as Type |
| (either insulated or |
Joint | Follow vent manufacturer’s instructions |
Sealing |
|
Table 5. Required Horizontal Venting Material.
WARNING
The outdoor vent terminal gets hot. Unit must be installed in such a way as to reduce the risk of burns from contact with the vent terminal.
2.3Locating Vent & Combustion Air Terminals
2.3.1 Side Wall Vent Terminal
The appropriate Bradford White side wall vent hood must be used, and is listed in the installation and operation manual. The terminal provides a means of installing the vent piping through the building wall, and must be located in accordance with ANSI Z223.1/ NFPA 54 and applicable local codes. In Canada, the installation must be in accordance with CSA B149.1 or
.2 and local applicable codes. Consider the following when installing the terminal:
1.Figure 3 shows the requirements for mechanical vent terminal clearances for the U.S. and Canada.
2.Vent terminals for condensing appliances or appliances with condensing vents are not permitted to terminate above a public walkway, or over an area where condensate or vapor could create a nuisance or hazard.
3.Locate the vent terminal so that vent gases cannot be drawn into air conditioning system inlets.
4.Locate the vent terminal so that vent gases cannot enter the building through doors, windows, gravity inlets or other openings. Whenever possible, locations under windows or near doors should be avoided.
5.Locate the vent terminal so that it cannot be blocked by snow. The installer may determine that a vent terminal must be higher than the minimum shown in codes, depending upon local conditions.
6.Locate the terminal so the vent exhaust does not settle on building surfaces or other nearby objects. Vent products may damage such surfaces or objects.
7.If the water heater uses ducted combustion air from an intake terminal located on the same wall, locate the vent terminal at least 3 feet (0.9m) horizontally from the combustion air terminal, and locate the vent terminal at least 1 foot (0.3m) above the combustion air terminal.
Important Note:
Massachusetts Code Requirement.
For Sidewall Vented Appliances with Vent Ter- minals Located Less Than 7 Feet above grade:
1.Massachusetts Code requires that a CO Detector and Alarm, listed by an approved third party inspection agency to ANSI/UL 2034 and complying with NFPA720 (2005 Edition) be installed on each floor level in which there are bedroom(s), if there is not one already present. The location shall be in the living space outside the bedroom(s).
2.An additional CO Detector and Alarm, as indicated above, shall be located in the room that houses the appliance and shall be powered by the same electrical supply as the appliance such that one service switch serves both the appliance and the CO detector. The CO detector shall have a battery backup.
3.The vent terminal, and if applicable the air intake terminal, shall be the approved Laars terminals. A copy of this manual shall remain with the appliance at the completion of the installation.
4.A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than
For Sidewall Vented Appliances with Vent Ter- minal Located More Than 7 Feet above grade:
Items 1, 2 and 3 above shall apply. Follow the Installation Instructions provided with the CO Detectors when installing them. For issues with the CO Detectors, contact the installing contractor.
2.3.2Side Wall Combustion Air Terminal
The Bradford White side wall combustion air
terminal (listed in Table 1) must be used when the unit takes its combustion air through a duct from a side wall. Consider the following when installing the terminal:
1.Do not locate the air inlet terminal near a source of corrosive chemical fumes (e.g., cleaning fluid, chlorinated compounds, etc.)
