GAS FIRED VENTED FLOOR FURNACES
15
ADJUSTING THE BURNER
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,
tum the floor furnace off immediately and refer to
the installation instructions or local code for proper
installation procedure.
ADJUSTING THE PILOT FLAME
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
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
"
Propane Gas, a
pilot adjustment must be made.
BURNER ORIFICE
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 NO. 0 - 2,000’
2,001 -
4,000’
4,001 -
6,000
6,001 -
8,000
8,001 -
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
PROPANE GAS (SPECIFIC ELEVATIONS)
MODEL NO. 0 - 2,000’
2,001 -
4,000’
4,001 -
6,000
6,001 -
8,000
8,001 -
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
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.
Figure 15
Now open the shutter slightly beyond the point that the
yellow disappears and the flame bums blue.
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.
SLIDING AIR SHUTTER
MANIFOLD TUBE
SET SCREW
BURNER
FIGURE 14
FIGURE 15
YELLOW
IMPROPER FLAME ADJUSTMENT
FIGURE 16
CORRECT FLAME ADJUSTMENT
BLUE
If difficulty in adjusting the burner is experienced, it may
be the result of incorrect gas supply pressure or manifold
pressure. Pressure can only be checked and adjusted by a
trained service technician using instruments designed for
that purpose.
