COZY HEDV254A Installation And Operating Instructions Manual page 11

PROPER BURNER FLAME
The burner flame may be obse_wed 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 tlle heat exchanger tube, (see Figure 10).
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 Fig. 11.)
5. Disconnect vacuum hose from burner box.
6. Remove screws holding burner box top to burner
box. (See Figure 11.)
7. Remove burner plate and burner box top. Take
care not to contact, or strata _gmtor m any way
as it is extremely fragile. (See Figure 11.)
8. Remove 2 nuts holding burner bracket. (See
Figure 11).
9. Slide burners toward heat exchanger and lift up
from rear and back. (See Figure 11).
10. Clean or replace as needed.
11. Reinstall by reversing Steps 9 - 1.
BURNER ORIFICE
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. See the
following orifice chart for the proper orifice drill size for a
specific elevation.
SPECIFIC ELEVATIONS
MODEL 0 to 2.000' 4,000' 6,000' 8,000' -
NO. 2.000' 4.000' 6.000' 8.000' 10.000'
NATURAL GAS
HEDV253A 51 52 52 53 54
HEDV403A 45 47 48 49 50
L.P. GAS
HEDV254A 58 60 62 63 64
HEDV404A 55 55 56 56 57
/Primary Flame
FIGURE 10
NOTE: THE FURNACE AND ALL COMPO-
NENTS MUST BE INSPECTED AT LEAST
ANNUALLY BY A QUALIFIED SERVIC E PER-
SON. 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.
MaxitroI
Gas \Mve
Burner
Box Top
Burner
Bracket
Direct Spark Ignitor
Manifold
FIGURE 11
Page 11