Removing An Existing Boiler - Harsco Industrial SC-1500 Owner's Manual

3.5 Removing an Existing Boiler

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 an existing boiler, while the other appliances remaining connected to the common
venting system are not in operation, the following steps should be followed with each appliance remaining
connected to the common venting system placed 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 or 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 appliance remaining connected to the common venting system are located and other spaces of
the building. Turn on 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 the appliance being inspected in operation. Follow
the lighting instructions. Adjust the thermostat so that the
appliance 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 or 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 previous conditions of use.
Any improper operation of the common venting system should be
corrected so the installation conforms to the National Fuel Gas Code,
ANSI Z223.1 and CSA B149 Installation Code. When resizing any
portion of the common venting system, the common vent 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.
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All threaded connections must
be made using a pipe
compound that is resistant to
the action of liquefied
petroleum gases. Do not use
Teflon tape on gas line threads!
N !
OTICE
See Pipe Capacity for Natural Gas
chart on the following page for
required pipe size, based on overall
length of pipe from the meter plus
equivalent length of all fittings.
Approximate sizing may be based
on 1 cubic foot of natural gas per
1,000 Btu per hour input, i.e.,
3,000,000 Btu/hr requires about
3,000 cubic feet per hour.
(See Section 4.4 Typical Boiler
Operating Conditions
information.)
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