1017952-A
Page 12
BURNER
NATURAL GAS - (SPECIFIC ELEVATIONS)
HEDV253A
HEDV403A
HEDV254A
HEDV404A
51
45
58
55
52
47
60
55
52
48
62
56
53
49
63
56
54
50
64
57
0 to
2,000’
0 to
2,000’
Model No.
Model No.
4,000 -
6,000’
4,000 -
6,000’
2,000 -
4,000’
2,000 -
4,000’
6,000 -
8,000’
6,000 -
8,000’
8,000 -
10,000’
8,000 -
10,000’
PROPANE GAS - (SPECIFIC ELEVATIONS)
The burner flame may be observed by raising the sight glass
cover. A proper flame will have a dark blue inner mantle,
with a lighter blue outer mantle that extends from the burner
into the heat exchanger tube,
(see Figure 11).
There is no primary air adjustment on the burner, and
proper flame is assured since the correct manifold pressure
and orificing have been done at the factory.
TO REMOVE MAIN BURNER
FOR INSPECTION AND CLEANING
1. Turn off all electrical supply to heater.
2. Turn off gas supply.
3. Remove front panel.
4. Unplug wire to direct spark ignitor and sensor.
See Figure 12.
5. Disconnect vacuum hose from burner box.
6. Remove screws holding burner box top to burner box.
See Figure 12.
7. Remove burner plate and burner box top. Take care not
to contact, or strain ignitor in any way as it is extremely
fragile.
See Figure 12.
8. Remove 2 nuts holding burner bracket.
See Figure 12.
9. Slide burners toward heat exchanger and lift up from
rear and back.
See Figure 12.
10. Clean or replace as needed.
11. Reinstall by reversing Steps 9–1.
FIG. 11
Primary Flame
Secondary Flame
Heat Exchanger Tube
Burner
FIG. 12
NOTE: The furnace and all components must be
inspected at least annually by a qualified service
technician.
This should include the burner, heat
exchanger, and vent system. Be sure that the flow
of combustion and ventilation air are not obstructed
and that all hoses are undamaged, and all clamps
are securely tightented.
PROPER BURNER FLAME
This appliance equipped only for altitudes 0 - 2,000 ft.
Appliance input ratings are based on sea level operation
and need not be changed for operation up to 2,000 feet
(609.9 m) elevation. For operation at elevations above
2,000 feet (609.9 m).
The BTU input must be reduced 4% per 1,000 ft. Orifice
change must be completed by a qualified installer or service
technician. See the following orifice chart for the proper
orifice drill size for a specific elevation.
BURNER ORIFICE
Direct
Spark Ignitor
Burner
Bracket
Burner
Burner
Box Top
Manifold
Maxitrol
Gas
Valve
