Lennox International Inc O23V4-105, O23V5-140, O23V5-154, O23V-70 Wall Thimble, Masonry Chimney

A, WARNING I

AWARNING

CAUTION

NOTE - Oil burning equipment may be vented into an ap- proved masonry chimney or type L vent. (Type L vent is similar in construction to type B gas vent. Type L vent car- ties a higher temperature rating and is constructed with an inner liner of stainless steel, rather than aluminum.)

Prior to installation of unit, make a thorough inspection of the chimney to determine whether repairs are necessary. Make sure the chimney is properly constructed and sized according to the requirements of the National Fire Protec- tion Association. The smallest dimensions of the chimney should be at least equal to the diameter of the furnace vent connector. Make sure the chimney will produce a steady draft sufficient to remove all the products of combustion from the furnace. A draft of at least .04" w.c. (9.9 Pa) is re- quired during burner operation.

1.Local building codes may have more stringent installa-

tion requirements and should be consulted before installation of unit.

2.The vent connector should be as short as possible to do the job.

3.The vent connector should not be smaller than the out- let diameter of the vent outlet of the furnace.

4.Pipe should be at least 24 gauge galvanized.

5.Single wall vent pipe should not run outside or through any unconditioned space.

6.Chimney should extend 3 feet (0.9 m) above highest point where the vent passes through the roof, and 2 feet (0.6 m) higher than any portion of a building within a horizontal distance of 10 feet (3 m).

7.The vent must not pass through a floor or ceiling. Clearances to single wall vent pipe should be no less than 6" (152 mm); more if local codes require it.

8.The vent may pass through a wall where provisions have been made for a thimble as specified in the Stan- dards of the National Board of Fire Underwriters. See figure 6.

Wall Thimble

COMBUSTIBLE	VENT PIPE
WALL

Figure 6

9.The vent pipe should slope upward toward the chim- ney on horizontal run at least 1/4 inch (6 mm) to the foot (0.3 m) and should be supported by something other than the furnace, such as isolation hangers. See figure 7.

Masonry Chimney

BAROMETRIC

CONTROL*LINER

(

LOCATION)

CLEAN OUT

MASONRY

CHIMNEY

CLEAN OUT

*Barometric control may be installed in either vertical or horizontal section of flue pipe within 18" of flue outlet of furnace.

Figure 7

10.Extend the vent pipe into the chimney so that it is flush with the inside of the vent liner. Seal the joint between the pipe and the liner.

11.The furnace shall be connected to a factory built chim- ney or vent complying with a recognized standard, or

masonry or concrete chimney lined with a lining mate- rial acceptable to the authority having jurisdiction.

12.When two or more appliances vent into a common vent, the area of the common vent should not be less than the area of the largest vent or vent connection plus 50% of the area of the additional vent or vent con- nection. Chimney must be able to sufficiently vent all appliances operating at the same time.

13.The vent pipe shall not be connected to a chimney vent serving a solid fuel appliance or any mechanical draft system.

14.All unused chimney openings should be closed.

15.All vent pipe run through unconditioned areas or out- side shall be constructed of factory built chimney sec- tions. See figure 8.

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505082M 10/05