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IF REPLACEMENT PARTS ARE NEEDED
When parts are needed, refer to boiler model and serial number
shown on the boiler name/rating plate.Whenever possible refer
to the original order by number and date.
Control identification and replacement should not be attempted
by unskilled personnel. Only simple, easily-identified controls
"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."
(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
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could cause an unsafe condition.
(c) Insofar as is practical, close all building doors and win-
dows and all doors between the space in which the appli-
ances remaining connected to the common venting
system are located and other spaces of the building. Turn
on clothes dryer 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 oper-
ate at maximum speed. DO 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.
It is strongly recommended to prevent or reduce condensation in the flue passages for fossil fuel cast-iron boilers.
Removal of Existing Boiler from Common Vent System
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Prevention or Reduction of Condensation in Flue Passages
This can be accomplished by:
• the use of a manual bypass between the boilers
• the use of Primary/Secondary piping
• the use of other effective arrangments or devices
and parts maybe obtained locally. All other controls and parts
should be identified by and ordered from Slant/Fin. Relief/Safe-
ty valves must be ASME rated for the pressure and gross output
of the boiler.
For replacement parts, heating contractors should contact their
Slant/Fin boiler distributor.
APPENDIX A
(e) Test for spillage at the draft hood relief opening after 5 min-
utes of main burner operation. Use the flame of a match or
candle, or smoke from a cigarette, cigar or pipe.
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(f) After it has been determined that each appliance remain-
ing connected to the common venting system properly
vents when tested as outlined above, return doors, win-
dows, exhaust fans, fireplace dampers and any other gas-
burning appliance to their previous conditions 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 Z2231 latest edition or CSA
B 149.1 latest edition for natural gas and propane. 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 Appendix G in the National Fuel Gas Code, ANSI
Z2231 latest edition or CSA B 149.1 latest edition for
natural gas and propane.
APPENDIX B
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