Form I-UDA, P/N 195673 Rev 13, Page 31
Inspect and Clean the
Burner
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7. Remove Secondary Air Baffles (Sizes 60-400 only)
- Vertical along the right side
of the burner, locate the flat plate(s) identified as the secondary air baffle(s). The
quantity of baffles could be one to four depending on heater size. Each baffle is
held in place by one screw.
For re-assembly, on the secondary air shield, mark
the location (top and bottom) of each baffle.
Remove all baffles.
8. Remove Burner Assembly
a) Locate the burner body supports. Depending on the size, the burner will have
two or more supports. At each support, remove the one screw that attaches it to
the secondary air shield
b) Holding the venturi tube, slide the entire burner assembly slightly to the right to
disengage the burner from the supports on the left. Then rotate the open end
of the venturi tube inward toward the heater. Carefully pull the burner assembly
out of the cabinet.
With the burner assembly removed, shine a flashlight on the burner ribbons. Look for
carbon buildup, scale, dust, lint, and/or anything that might restrict flow through the
spaces between the burner ribbons. Holding the burner assembly so that any foreign
material will fall away from the burner, use a stiff bristle brush to loosen and remove
any foreign material(s). If the burner is excessively dirty, remove one of the burner end
caps. Remove the four screws that hold the end cap to the burner housing. Lightly tap
the end cap to remove it.
Clean all foreign material from the burner and venturi. After the burner is thoroughly
clean, replace the end cap making certain that it is tight against the burner housing.
NOTE:
If any of the burner components are damaged or deteriorated, replace the
burner assembly.
Inspect the Lower Portion of the Heat Exchanger (with burner assembly
removed)
At the burner flame entrance of each tube, shine a bright light into each heat exchanger
section. With the light shining into the heat exchanger, observe the outside for visible
light. Repeat this procedure with each heat exchanger section. If any light is observed,
replace the heat exchanger.
FIGURE 19 - Burner
Removal (UDAP
illustrated; same
process for both
UDAP and UDAS)
Re-Install the Burner
Instructions to Re-Install the Burner (Refer to FIGURE 19)
1. Attach the Burner Assembly -
Holding the venturi tube, slide the entire burner
assembly into position. Align the supports on the left side with the slots in the
