- COZY/ Louisville Tin and Stove Co. Inc. INSTALLATION AND OPERATING INSTRUCTIONS Gas-Fired Vented FLOOR FURNACE 90N30A, 90N50A, 90N65A, 90N75A

ManualsBrandsLouisville Tin and Stove ManualsFurnace90N30A

FRESH AIR FOR COMBUSTION AND VENTING

Adequate air for combustion and venting must be provided. Any reduction in the necessary amount of fresh air

can result in an oxygen starved flame that emits Carbon Monoxide (C.O.) an odorless, colorless gas

that can cause serious injury or death. A ventilated crawl space will usually provide enough fresh air. However, you

must check to see that there is 1 square inch of free area of ventilation opening for each 1,000 BTU’s input of your floor furnace.

EXAMPLE: 50,000 BTU floor furnace  1,000 = 50 square inches. If another gas burning appliance such as a water heater is

installed within the same crawl space or basement, add the B.T.U.’s of the other appliance to those of the floor furnace before

calculating the total ventilation needed. EXAMPLE: 50,000 B.T.U. floor furnace plus 40,000 B.T.U. water heater equals 90,000

B.T.U.  1,000 = 90 square inches. To compensate for the loss of square inches of ventilation due to the use of louvers, grills,

or screens add approximately 50% to the square inches calculated. Screen all openings with mesh not less than ¼ inch to

prevent animals or insects from entering the crawl space.

All type “B” vents shall extend in a generally vertical direction with offsets not exceeding 45 degrees, except that a vent system

having not more than one 60 degree offset may be allowed.

Any angle greater than 45 degrees from the vertical is considered horizontal. The total horizontal run of a vent plus the

horizontal vent connector shall be not greater than 75 percent of the vertical height of the vent.

Any offsets used should be as far above the drafthood as possible to allow a venting action to begin before any restriction is

encountered.

FLOOR FURNACE LOCATION

Choose a central location such as a hallway but where occupant traffic is minimal and where there is at least 18 inches of

room from two adjoining sides of the grill to the nearest wall so that occupants may pass without stepping on the grill. See

Figure Number 1.

After selecting a location in the home, go beneath the floor and check

the position of the floor furnace in relation to joists, supporting

columns, electric wires, water pipes and walls. There must be a minimum

of 6 inches clearance between the top of the draft hood and floor

joists. There must also be at least 6 inches clearance between the

bottom of the floor furnace and the ground. See Figure 3.

In order to find the location beneath the floor it may be necessary to

drill a 1/16 inch hole through the floor approximately in the center of

the selected floor furnace location to use as a reference point when

measuring under the floor.

WALL

8” Minimum

FIGURE 2

FLOOR

JOIST

FLOOR

FURNACE

6” Minimum

Ground

Level

Draft

Hood

Vent Pipe

FIGURE 3

Page 4

Give consideration to available air for combustion, location in relation to chimney or vent system, thermostat location,

clearance under floor, clearance to combustibles, and heat circulation. Any open foundation is unacceptable as wind can

cause pilot outage and reduced efficiency. Keep furniture, drapes, doors, and other combustible materials at least 12 inches

from the edge of the grill. Never locate the floor furnace closer than 8 inches to a wall and never in a corner. See Figure 2.

Two adjoining sides of the floor furnace must have a minimum clearance of 18”. See Figure 1.

FIGURE 1

Bedroom

Bath

Kitchen

Vent Pipe

Thermostat

18” Minimum

Living Room