Manual
Pre-Installation Items
2
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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 remaining appli-
ances. At the time of removal of an existing boiler, the
following steps shall be followed with each appliance
that remains connected to the common venting system.
Place each appliance in operation, while the other appli-
ances remaining connected to the common venting sys-
tem 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 there is no
blockage or restriction, leakage, corrosion and other
deficiencies 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. 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 maxi-
mum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
DANGER
4
. Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat so
a
ppliance will operate continuously.
5. 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
o
r pipe.
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 previ-
ous condition of use.
7. Any improper operation of the common venting sys-
tem should be corrected so the installation conforms
with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CAN/CGA B149, Installation
Codes. When resizing any portion of the common
venting system, the common venting system should
be resized to approach the minimum size as deter-
mined using the appropriate tables in Part 11 of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or CAN/CGA B149, Installation Codes.
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DANGER