COZY W255G Instructions D'installation Et D'utilisation page 9

FIG. 2
USING ADJACENT
STUD SPACE FOR ALL
COMBUSTION AIR FROM OUTSIDE
Holes Connecting to Ventilated Attic
Holes Connecting to Ventilated Crawl Space
Based on 4,000 BTU of total input
rating of all gas appliances, the heater
only requires a minimum free area of:
BTU Square In. Hole Size
25,000 06.25
33/35,000 08.75
50,000 12.50
1017754-A
Ceiling
Plate
Air
Grille
Floor
Plate
Square In.
1" 0.785
1.5" 1.760
2" 3.140
VENTING
This appliance must be properly connected to a venting system.
Consult local ordinances governing venting. Install only UL listed type
BW 4" oval gas vent. When the vent enters the attic, a listed type B-1
round flue pipe may be used. See Figure 7-A (on page 10).
Vent pipe must connect to the wall furnace header plate with a "B"
vent base plate and terminate with a cap at a point at least 12 foot
above the bottom of the wall furnace, two feet above any obstacle
within a 10 foot radius, and at least 3 foot above the roof.
PROVISIONS MUST BE MADE FOR ADEQUATE COMBUSTION
AND VENTILATION AIR.
This appliance is equipped with a manual reset blocked flue switch
designed to protect against a blocked flue condition, which would
cause combustion products to spill back into the living quarters.
NOTE: A partially blocked, inadequate, or disconnected vent
system may not activate the switch.
Discoloration of the grille is an indication of a bad vent. If this
occurs, the vent can be checked by a qualified serviceman using a
draft gauge. After 15 minutes the gauge should read between -.02
up to -.04 inches w.c. Vent must be checked at the beginning of
each heating season.
The switch when activated will break the thermostat circuit turning
off the main burner flame. Before the burner will relight, the switch
must be manually reset. See Figure 4-A (on page 9) for location
of the manual reset blocked flue switch. To reset the switch, insert
a slender rigid object (i.e. screwdriver) through the front panel
louvers and push the reset button down. See Figure 4-B (on page
9). However, you may have to remove the front panel, then reset
the switch and re-install the front panel before turning the burner
on. If homeowner experiences this problem, the vent system must
be checked and corrected.
NOTE: A preexisting vent that has worked for years may not
be adequate for todays design because of higher efficiency
requirements that result in lower stack temperatures. See
"Possible Causes and Corrective Action" on pages 25-27.
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.
Page 8
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