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UBX-UBZ-UDX-UDZ-IOM (07-23) 1034344-K
Figure 15. Typical Burner Assembly
1. Remove gas and electric supply:
a. Shut OFF gas supply ahead of union at manual shutoff valve outside cabinet.
b. Turn OFF electric supply.
c. Disconnect gas supply at union outside of cabinet.
⚠ CAUTION ⚠
Take care not to damage the ignitor while removing or cleaning the burner assembly.
2. Remove burner assembly (see Figure 15):
a. Remove access panel.
b. Disconnect gas train:
(1) Mark and disconnect wires at combination gas valve.
(2) Carefully remove burner orifice and orifice adapter locking nut.
(3) Slide orifice adapter out through bracket on venturi tube while pushing gas train to right. This will move
gas train out of way.
c. Detach control assembly:
(1) Remove two screws that secure control assembly bracket.
(2) Being careful not to disconnect any wires, slide control assembly to right.
d. Remove secondary air baffle(s) (unit sizes 060–400 only):
(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).
MAINTENANCE—CONTINUED
Maintenance Procedures—Continued
Burner Maintenance—Continued
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