Crown Boiler BWC151 - Manual (Page 24)

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D. Removing an Existing Boiler From a Common Chimney
Read this only if the BWC boiler is replacing an existing boiler that is being removed from a common chimney. This
section does not apply to the installation of a BWC boiler.
In some cases, when an existing boiler is removed from a common chimney, the common venting system may be too
large for the remaining appliances. At the time of removal of an 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.
Seal any unused openings in the common venting system. (a)
Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or (b)
restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
Insofar as practical, close all building doors and windows and all doors between the space in which all the (c)
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. Do not operate a summer exhaust fan.
Close fireplace dampers.
Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so the appliance (d)
will operate continuously.
Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match (e)
or candle, or smoke from a cigarette, cigar, or pipe.
After it has been determined that each appliance remaining connected to the common venting system properly vents (f)
when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning
appliances to their previous condition of use.
Any improper operation of the common venting system should be corrected so the installation conforms with the (g)
National Fuel Gas Code, ANSI Z223.1. When re-sizing any portion of the common venting system, the common
venting system should be re sized to approach the minimum size as determined using the appropriate tables in Part
11 of the National Fuel Gas Code, ANSI Z223.1.
WARNING
NEVER COMMON VENT A BWC BOILER WITH OTHER APPLIANCES.