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2 Replacement procedures
•
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 the 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.
(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 the
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 the maximum speed.
Do not operate a summer exhaust fan. Close fire place dampers.
3 Dimensional information required for connection of the boiler
GT 408 A to GT 410 A
10"
Ø A
21/09/06 - 94863449 - 82294154E
5
"
1/8
Ø A
39
"
7/8
GT 411 A to GT 414 A
12"
GT 400 A
(d)Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so appliance will operate
continuously,
(e)Test for leakage at the draft hood relief opening after 5 minutes of
main burner operation.
(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 and/or CAN/CGA B149 Installation Codes. When
resizing any 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 and/or CAN/CGA B149, Installation Codes.
(h)The minimum distance from adjacent public walkways, adjacent
buildings, openable windows and building openings shall not be less
than those values specified in the National Fuel Gas Code ANSI
Z223.1 and/or CAN/CGA B149, Installation Codes.
The boiler must be connected to a venting system
that safely discharges all flue gases to the outside in
an effective manner.
The sizing of the boiler breeching and chimney
venting must follow local and national code
requirements.
35
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