Boyertown Regal Oil Furnace Nrg Max - Manual (Page 14)

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number of elbows and to avoid sharp turns or other construction features that would create excessive
resistance to the flow of flue gasses. Tees may be used in a straight section in conjunction with a
barometric draft regulator; however, they must not be used for a 90° turn. No device that will obstruct
the free flow of flue gasses shall be installed in the chimney connector. This does not exclude the use
of devices specifically designed for the use in chimney connectors such as automatic dampers. The
vent pipe should be joined with metal screws and supported by straps. A thimble should be used to
connect the vent connector pipe to the chimney so the pipe may be readily removed in case of
inspection or replacement.
No chimney connector shall pass through any floor or ceiling. The vent connector pipe must not pass
through a combustible wall or partition unless they are guarded at the point of passage by a ventilated
metal thimble not less than 12 inches larger in diameter than the connector, on metal or fireclay
thimbles adequate protection is provided at the passageway. An acceptable passageway could be
either an approved, ventilated metal thimble which is at least 12 inches larger in diameter than the
vent connector pipe, or brick work which is at least 8 inches thick constructed into the wall and
surrounding the vent connector
Clearances from combustible materials or materials shall be in accordance with the clearances given
in Tables 1 or 2. The vent connector pipe should extend only to (and not beyond) the inside wall of
the chimney. A thimble should be used to connect the vent connector pipe to the chimney so that the
vent connector pipe may be readily removed in case of inspection or replacement.
Connection to the chimney must be made above the bottom of the chimney to avoid blockage. Vent
piping should extend just into the chimney far enough to expel flue gasses. Inserting the vent piping
too far into the chimney will cause undue obstruction. Use a thimble or a slip joint where vent pipe
enters the chimney to allow easy removal for cleaning.
A draft regulator, which is shipped in the blower compartment, must be installed in the vent piping. It
should be located at least 24 inches from the furnace if possible in either a horizontal or vertical
section of the vent pipe. The draft regulator must be installed in the same room as the furnace and in
such a manner that there is no difference in pressure between the air in the vicinity to the regulator and
the combustion air supply. Ensure that the barometric damper is accessible for adjustment.
With the burner operating, use a draft gauge to adjust the regulator to the proper setting (see
instructions enclosed with draft gauge to adjust the regulator to the proper setting). When the burner
air supply and draft are properly adjusted, the over-fire draft should be a negative .02" W.C.
Two or more oil burning appliances each equipped with a safety control may be permitted to be
connected to one common chimney if sufficient draft is available for the safe simultaneous removal of
all products of combustion.
If two or more openings are provided into one chimney, they shall be at different levels on the same
story of the building, with the smaller appliance entering at the highest possible level consistent with
clearances to combustible materials.
Two or more connectors shall not be joined together unless the common connector, manifold and
chimney are properly sized. Adequate draft must be available to safely remove all products of
combustion simultaneously without leakage, or back flow.
Power Venting
The furnace may be power vented through a side wall by using a listed power side wall Venter. The
vent device must be able to produce a draft of -.02”W.C. over the fire and be equipped with a post
purge timer set to a minimum time of 5 minutes. The power vent must be installed in accordance with
the recommendations of the manufacturer, all applicable building code requirements, and NFPA-31.