Vent System; Adjusting The Burner - COZY 90N30A Installation And Operating Instructions Manual

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, tum the floor furnace off immediately and refer to the installation instructions or local code for proper installation
procedure.
Refer to Figure 13 for the correct size pilot flame.
If adjustment is necessary, refer to Figure 11 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
tum clockwise to decrease the flame or counterclockwise
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" Propane Gas, a pilot adjustment must be made.
This appliance equipped only for altitudes 0- 2,000 feet. If installed above
2,000 feet, the BTU input must be reduced 4% per 1,000 feet. Orifice change
must be completed by a qualified installer or service technician. See the
following orifice chart for the proper orifice for a specific elevation.
NATURAL GAS - (SPECIFIC ELEVATIONS)
Model 0 to 2,000 -
No. 2,000' 4,000'
90N30A 38 41
90N50A 30 31
90N65A 26 28
Order Kit #49800 44-1 High Altitude Kit
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 15).
Now open the shutter slightly beyond the point that the yellow disappears and the flame bums blue (See Figure 16). 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.
FIG. 14
Sliding Air Shutter
BURNER
Set Screw
ADJUSTING THE PILOT FLAME
BURNER ORIFICE
4,000 - 6,000 - 8,000 -
6,000' 8,000' 10,000'
42 43 44
31 32 35
29 30 30
ADJUSTING THE BURNER
FIG. 15
Manifold
Tube

VENT SYSTEM

to
PROPANE GAS - (SPECIFIC ELEVATIONS)
Model 0 to
No. 2,000'
90P30A 1/16
90P50A 47
90P65A 43
Order Kit #49800 44-1 High Altitude Kit
Improper Flame Adjustment
YELLOW
Page 13
FIG. 13: Pilot Flame Adjustment
Pilot flame should envelop 3/8 to 1/2 inch of the
powerpile or thermocouple.
2,000 - 4,000 - 6,000 -
4,000' 6,000' 8,000'
53 53 54
49 49 50
44 45 47
FIG. 16
Correct Flame Adjustment
BLUE
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3/8 to 1/2 Inch
8,000 -
10,000'
54
51
48
1017826-A