15
3.4
– Removal of Existing Appliance (If Applicable)
When an existing appliance 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 appliance, the following steps must
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 that there is no blockage,
restriction, leakage, corrosion or other deficiency, which
could cause an unsafe condition.
3. Insofar as 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. If applicable turn on
the clothes dryers and any appliances 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 that appliance
operates continuously.
5. If provided, test for spillage at the draft control device relief
opening after 5 minutes of main burner operation. Use a cold
mirror, or the flame of a match or candle.
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 condition 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 the
Natural Gas and Propane Installation Code, CSA B149.1-15
and CSA B149.2-15 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 Chapter 13 of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 and /or the
Natural Gas and Propane Installation Code, CSA B149.1-15
and CSA B149.2-15 Installation Codes.
3.5
– Outdoor Venting
The VTech windproof cabinet protects the unit from weather,
meaning it is suitable for outdoor installation (By using special
kit).
1. Periodically check to ensure that air intake and vent cap are
not obstructed.
2. Locate appliance at least 3 feet away from any overhang.
3. Locate appliance at least ten feet from building air intake.
4. Avoid installation in areas where runoff from adjacent building
can spill onto appliance.
For outdoor installations, always consider the use of a shelter
such as a garden shed in lieu of direct exposure of the appliance
to the elements. The additional protection afforded by the shelter
will help to minimize nuisance problems with electrical
connections and will allow easier servicing of the appliance under
severe weather conditions.