Oil Furnace Installation Manual

506793-02B Page 7 of 16Issue 1810
1. Local building codes may have more stringent
installation requirements and should be consulted
before installation of the unit.
2. The ue pipe should be as short as possible to do the
job.
3. The internal diameter of the ue pipe or vent connector
shall equal the outlet diameter of the ue opening of
the appliance. If the ue vent collar is larger or smaller
than the ue pipe, a gradual transition piece shall be
used and the system shall be tested to ensure that
adequate draft is provided.
4. Single wall ue pipe should not run outside or through
any unconditioned space.
5. Chimney ue shall extend at least 3’ above the highest
point at which the chimney comes in contact with the
roof and not less than 2’ above the highest roof surface
or structure within 10’ of the chimney on a horizontal
plane perpendicular to the chimney. Not more than
4” of chimney ue above the chimney cap shall be
considered in computing this height.
6. The ue pipe must not pass through a oor or ceiling.
Clearances to single wall ue pipe should be no less
than specied in the Clearances section.
7. The ue pipe may pass through a wall where provisions
have been made for a thimble as specied in the
Standards of the National Board of Fire Underwriters
(see Figure 5).
Figure 5. Wall Thimble
8. The ue pipe should slope upward toward the chimney
on a horizontal run of at least 1/4” per foot and should
be supported by something other than the furnace
(see Figure 6 and Figure 7).
9. Extend the ue pipe into the chimney so that it is ush
with the inside of the ue liner. Seal the joint between
the pipe and the liner.
10. The furnace shall be connected to a factory-built
chimney or vent complying with a recognized standard,
or a masonry or concrete chimney lined with a lining
material acceptable to the authority having jurisdiction.
Figure 6. Factory-Built Chimney
Front Flue
Rear Flue
* Barometric control may be installed in either the vertical or
horizontal section of the ue pipe within 18” of the ue outlet of
the furnace.
11. When two or more appliances vent into a common
ue, the area of the common ue should not be less
than the area of the largest ue or vent connection
plus 50% of the areas of the additional vents or ue
connections. The chimney must be able to sufciently
vent all appliances operating at the same time.
12. The ue pipe shall not be connected to a
chimney ue serving a solid fuel appliance or any
mechanical draft system.
13. All unused chimney openings should be closed.
14. All vent pipe run through unconditioned areas or
outside shall be constructed of factory-built chimney
sections (see Figure 6).
15. Where condensation of ue gases is apparent, the vent
shall be constructed to prevent the condensation from
entering the ue transition box opening. Provisions
shall be made to drain off the condensate (see Figure
6).