c. Remove secondary air baffle(s):
(1) Locate flat plate(s) identified as secondary air baffle(s)—vertical along right side of burner. Quantity of
baffles could be one to four depending on heater size. Each baffle is held in place by one screw.
(2) For correct re-assembly on secondary air shield, mark location (top and bottom) of each baffle.
(3) Remove screw(s) and remove baffle(s) (all).
d. Locate burner body supports—depending on size, burner will have two or more supports. At each support,
remove one screw that secures support to secondary air shield.
e. While holding venturi tube, slide entire burner assembly slightly to right to disengage burner from supports on left.
f. Rotate open end of venturi tube inward toward heater and carefully pull burner assembly out of cabinet.
3. Inspect and clean burner:
NOTE: If, upon inspection, any of the burner components are damaged or deteriorated, replace
the burner assembly.
a. With burner assembly removed, shine flashlight on burner ribbons. Look for carbon buildup, scale, dust, lint,
and/or anything that might restrict flow through spaces between burner ribbons.
b. While holding burner assembly so that any foreign material will fall away from burner, use stiff bristle brush to
loosen and remove any foreign material(s).
c. If burner is excessively dirty, remove one burner end cap:
(1) Remove four screws that secure end cap to burner housing.
(2) Lightly tap end cap to remove it.
d. Clean all foreign material from burner and venturi.
e. When burner is thoroughly clean, replace end cap, ensuring that it is tight against burner housing.
4. Inspect lower part of heat exchanger:
a. With burner assembly removed, shine bright light into each heat exchanger section at burner flame entrance
of each tube.
b. With light shining into heat exchanger, observe outside for visible light. Repeat for each heat exchanger section.
c. If any light is observed, replace heat exchanger.
5. Re-install burner assembly (see Figure 29):
a. Attach burner assembly:
(1) While holding venturi tube, slide entire burner assembly into position.
(2) Align supports on left side with slots in burner shield and slide supports into slots.
(3) On right, install screw that secures each burner body support to secondary air shield.
b. Re-install secondary air baffles—install screw that secures each baffle(s)—baffles may be different sizes and
each must be installed in correct location as marked.
c. Attach control assembly:
(1) Carefully slide control assembly into position and secure using same screws.
(2) Check to ensure that all wire connections are secure.
d. Attach gas train:
(1) Slide gas train into position so that orifice adapter is slid through bracket on burner.
(2) Secure gas train to bracket using locking nut.
(3) Install gas orifice and reconnect wires to gas valve.
e. Install access panel.
f. Reconnect gas supply at union outside of cabinet.
g. Leak test connection using leak detecting solution. If leak is detected, tighten connection. If leak cannot be
stopped by tightening connection, replace part(s).
6. Turn ON electric and gas.
7. Check for proper operation.
49
I-UEZ (04-21) 1034347-0
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