Vent System, Burner Orifice | Louisville Tin and Stove 90N75A

VENT SYSTEM

After the floor furnace has been burning for five minutes, hold a match or candle under the draft hood at the air intake area. If the vent system is working properly, the flame will be pulled into the air inlet of the draft hood. If the vent system is not working properly, turn the floor furnace off immediately and refer to the installation instructions or local code for proper installation procedure.

PILOT FLAME ADJUSTMENT Pilot flame should envelop 3/8 to 1/2 inch of the tip of the generator.

3/8 to 1/2”

FIGURE 17

ADJUSTING THE PILOT FLAME

Refer to Figure 17 for the correct size pilot flame. If adjustment is necessary, refer to Figure 12 for the location of the pilot adjustment screw. Using a standard screwdriver, remove the pilot adjustment screw cover. Insert a

small screwdriver into the pilot adjustment screw and turn clockwise to

decrease the flame or counterclockwise to increase the flame. If the flame is too low, the safety pilot may cause all of the gas to be cut off. NOTE: The gas supply to the pilot is unregulated. When line pressure exceeds 7” Natural Gas, or 11” L.P. Gas, a pilot adjustment must be made.

BURNER ORIFICE

This appliance is orificed at the factory for elevations up to 2,000 feet. If installed above 2,000 feet, the BTU input must be reduced 4% per 1,000 feet. See the following orifice chart for the proper orifice for a specific elevation.

NATURAL GAS

SPECIFICELEVATIONS

Model No.	0 to	2,000 -	4,000 -	6,000 -	8,000 –
	2,000’ 4,000’		6,000’	8,000’	10,000’
90N30A	38	41	42	43	44
90N50A	30	31	31	32	35
90N65A	26	28	29	30	30
ORDER KIT #49800 44-1 HIGH ALTITUDE KIT
90N75A	33	36	37	38	41

ORDER KIT #49850 2287-2 HIGH ALTITUDE KIT

L.P. GAS

SPECIFICELEVATIONS

Model No.	0 to	2,000 -	4,000 -	6,000 -	8,000–
	2,000’	4,000’	6,000’	8,000’	10,000’
90P30A	1/16	53	53	54	54
90P50A	47	49	49	50	51
90P65A	43	44	45	47	48
ORDER KIT #49800 44-1 HIGH ALTITUDE KIT
90P75A	51	52	52	53	54

ORDER KIT #49850 2287-2 HIGH ALTITUDE KIT

ADJUSTING THE BURNER

After the floor furnace has been burning 15 minutes, remove the bottom pan from the outer casing exposing the complete burner assembly. Loosen the screw at the bottom side of the sliding air shutter. Slide the air shutter closed until yellow tips start to appear at the top of the flame. See Figure 19. (75,000 BTU floor furnace has two burners, both of which may need adjustment). Now open the shutter slightly beyond the point that the yellow disappears and the flame burns blue. (See Figure 20). Airborne dust particles may cause flashes or streaks of yellow flame as they are drawn into the flame but will have no effect on the efficiency of the floor furnace. If you are satisfied that the burner is properly adjusted, tighten the set screw to lock the shutter in position. Replace the bottom pan. Check air shutter setting at least twice each season to assure that changing conditions are not causing yellow tipping.

Sliding Air Shutter

BURNER

Set Screw

Manifold Tube

YELLOW

IMPROPER FLAME ADJUSTMENT

BLUE

CORRECT FLAME ADJUSTMENT

FIGURE 18

FIGURE 19

FIGURE 20

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90N50A, 90N30A, 90N65A, 90N75A specifications

Louisville Tin and Stove has established a reputation for quality and innovation in the heating and cooling industry with its line of products, particularly the 90N65A, 90N50A, 90N75A, and 90N30A models. Each of these units boasts distinctive features, technologies, and characteristics that cater to a variety of residential and commercial needs.

The 90N65A model stands out for its impressive energy efficiency, designed to operate at an efficiency rating of up to 95%. This model employs advanced condensing technology, which allows it to extract more heat from the combustion process, significantly reducing energy costs for users. Moreover, its variable speed blower promotes quiet operation while optimizing airflow, ensuring that spaces are comfortably heated or cooled without excessive noise.

In contrast, the 90N50A model is engineered for versatility and compactness. This makes it an ideal choice for smaller homes or tight spaces where every inch counts. Despite its size, the 90N50A does not compromise on performance, delivering robust heating capabilities with an efficiency rating also reaching up to 94%. Its straightforward installation process, along with its user-friendly interface, allows for quick setup and ease of operation, appealing to both homeowners and technicians.

The 90N75A model is tailored for larger environments, with a higher BTU output designed to keep extensive areas warm even during the coldest months. It features dual heat exchangers that enhance durability and thermal efficiency, ensuring a longer lifespan. Furthermore, the integrated smart technology allows homeowners to monitor and adjust settings remotely, providing ultimate convenience and control over indoor climates.

Finally, the 90N30A serves as a budget-friendly option without sacrificing quality or efficiency. It incorporates a simplified design that ensures reliability while still achieving a commendable efficiency rating. Ideal for those seeking an economical heating solution, the 90N30A supports both natural gas and propane fuel options, making it adaptable to various energy sources.

All models highlight Louisville Tin and Stove's commitment to sustainability and reducing environmental impact. By incorporating innovative technologies such as modulating burners and advanced heat exchangers, these units not only comply with modern regulatory standards but also contribute to a greener planet. In summary, the Louisville Tin and Stove series—90N65A, 90N50A, 90N75A, and 90N30A—offers a robust selection of heating solutions that cater to diverse needs, emphasizing efficiency, performance, and adaptability.