COZY C255H Manual Del Propietário página 9

WARNING: Danger of property damage, bodily injury or loss
of life. Even when a house meets requirements for unconfined
space with adequate air infiltration, it is recommended that
a fresh air intake be installed to lessen the possible dangers
from any future changes on the home.
LOUVERS / GRILLES AND SCREENS COVERING FREE AREA
OPENINGS
If a screen is used to cover the opening(s), it must not be smaller than
1/4-inch mesh. Use the free area of a louver or grille to determine the
size opening required to provide the free area specified. If the free area
is not known, assume a 20% free area for wood and a 60% free area
for metal louvers or grilles.
INFILTRATION AIR
If your furnace is in an open area (unconfined space), the air that
leaks through the cracks around doors and windows may be enough
for combustion and ventilation air. The doors should not fit tightly. The
cracks around windows should not be caulked or weather stripped.
Spillage means air starvation. A fresh air duct or air intake opening
must be installed to provide air directly to the furnace or other gas
appliances.
If spillage exists or when the furnace is in a building of tight
construction where the windows and doors are weather stripped, air
for combustion and ventilation must be obtained from outdoors or
space open to the outdoors.
To determine if infiltration air is adequate, perform the following
checks:
1. Close all doors and windows. If you have a fireplace, start
a fire and wait until flames are burning vigorously.
2. Turn on all exhausting devices, i.e., kitchen and bathroom
exhaust fans; water heaters (gas and electric).
3. Turn on all vented gas appliances, i.e., heating equipment
(includes any room heaters), water heaters.
4. Wait ten (10) minutes for drafts to settle.
5. Check for draft hood spillage at each appliance. Hold a lit
match two-inches from the draft opening. (Figure 2).
A. No Spillage
If the match flame pulls toward draft hood, this indicates sufficient
infiltration air. Return exhausting devices and appliances to the
condition you found them.
B. Draft Hood Spills If there is spillage at a draft hood (match goes
out or flame wavers away from draft hood), check for plugged flue
connectors and chimneys. Repair blockage and test again.
FIGURE 2 – DRAFT HOOD SPILLAGE
VENT PIPE
DRAFT HOOD
OPENING
(match or
smoke pen)
TYPICAL WATER
HEATER
INSTALLING YOUR FURNACE
VENT PIPE
DRAFT HOOD
OPENING
(match or
smoke pen)
WALL
FURNACE
If you have a fireplace, open a window or door near the fireplace
and then check for spillage. If spillage stops, do not use the fireplace
without a nearby window or door open until you can supply fresh air
by a permanent duct.
If you have kitchen and bathroom exhaust fans, turn them off and
check for spillage. If spillage stops, do not use exhaust fans (circuit
breakers for fans should be turned off) until you can supply fresh air
by a permanent duct.
Provide opening(s) having a total free area of one-square-inch per
4,000 BTU/hr. of the total combined input ratings for all appliances
in the area. The required free area is shown in Figure 3. This fresh
air opening or duct must terminate at a point not more than one-foot
above the floor. It must have at least one-square inch of free area for
each 4,000 BTU/hr. of input of all appliances in area.
FIGURE 3 – FREE AREA
Free Area in Square Inches.
Each opening is based on one square inch per 4,000 BTU/hr
Square inches
BTU/hr input of opening
30,000
7.5
35,000
8.75
40,000
10.00
45,000 11.25
50,000 12.50
60,000 15.00
HOLE PLACEMENT - EXAMPLE
AIR GRILLS TO STUD SPACE
HOLES FROM VENTILATED
CRAWL SPACE INTO STUD SPACE
HOLES IN BOTTOM ON BACK OF FURNACE INTO OPEN STUD
SPACE OR CRAWL SPACE
COZY TOP VENT GRAVITY GAS WALL HEATER
Required number of holes
sill or header plates
1 - 1/2" 2" 3"
7 4 2
8 5 2
9 5 3
10 6 3
11 8 3
13 8 4
HOLES FROM VENTILATED
ATTIC INTO STUD SPACE
12" MAX FROM FLOOR
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