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Form I-UDA, P/N 195673 R24, Page 30
10.2 Maintenance
Procedures
10.2.1 Heat
Exchanger
Maintenance
This heater has a TCORE
2
®
heat exchanger.
Remove any external dirt or dust accumulation. Visually check the heat exchanger for
cracks and holes. If a crack or hole is observed, replace the heat exchanger.
NOTE: Inspection of the lower portion of the heat exchanger is done with the burner
removed. See the Burner Service section below for information on inspecting the lower
portion of the heat exchanger.
10.2.2 Burner
Maintenance
If there is an accumulation of dirt, dust, and/or lint, clean the compartment and follow
the instructions below to remove and clean the burner.
CAUTION: Use of eye protection is recommended.
Burner Removal
Instructions (Refer to
FIGURE 19.)
1. Outside the cabinet, shut the gas supply off at the manual valve ahead of the
union.
2. Turn off electric supply.
3. Disconnect the gas supply at the union outside of the cabinet.
4. Remove the access panel.
5. Disconnect and Move the Gas Train - At the gas valve, mark and disconnect the
wires. Carefully remove the burner orice and orice adapter locking nut. Slide the
orice adapter out through the bracket on the burner pushing the gas train to the
right. This will move the gas train out of the way.
6. Move the Control Assembly - Remove the two screws holding the control
assembly bracket. Being careful not to disconnect any wires, slide the control
assembly to the right.
7. Remove Secondary Air Bafes (Sizes 60-400 only) - Vertical along the right side
of the burner, locate the at plate(s) identied as the secondary air bafe(s). The
quantity of bafes could be one to four depending on heater size. Each bafe is
held in place by one screw. For re-assembly, on the secondary air shield, mark
the location (top and bottom) of each bafe. Remove all bafes.
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.
FIGURE 19 - Burner
Removal (UDAP
illustrated; same
process for both
UDAP and UDAS)
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