GBT A2-035, Installation & Operating Instructions Manual

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Removal of Existing Appliance: If 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, 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.
(a) Seal any unused openings in the common venting system.
(b) 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.
(c) 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. 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. Don not operate a summer exhaust fan. Close fireplace dampers.
(d) Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so
appliance will operate continuously.
(e) 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.
(f) 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.
(g) Any improper operation of the common venting system should be corrected so the installation conforms
with the National fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and
Propane Installation Code. 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 11 of the
National fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1,
Natural Gas and Propane Installation Code.