Thomas & Betts LDAP 1200 warranty Burner Maintenance cont’d, Burner Removal Instructions cont’d

30.Burner Maintenance (cont’d)

Burner Removal Instructions (cont’d)

6.Remove Burner Assembly

a)Locate the three upper burner body supports. At each support, remove the one screw that attaches it to the burner shield.

b)Holding the venturi tube, slide the entire burner assembly slightly upward to disengage the burner from the supports on the bottom. Then rotate the open end of the venturi tube outward toward the access door opening. Carefully pull the burner assembly out of the cabinet.

FIGURE 23 - Burner Removal

•Size 400 has 1 burner.

•Size 800 has 2 burners.

•Size 1200 has 3 burners.

Disconnect union(s). (On Size 400 or the most downstream heat section in a Size 800 or 1200, there will be one union to disconnect. The first heat section in Sizes 800 and 1200 and the second heat section in Size 1200 will have two unions to disconnect.)

Gas Valve - Mark and disconnect the wires.

Remove orifice adapter locking nut.

Burner Shield

Burner Body Support - Remove the three screws attaching the burner assembly to the burner shield.

Burner	To remove burner assembly,
Assembly	lift and rotate outward.

Remove the burner orifice and slide out through the bracket.

Venturi Tube (part of the burner assembly)

Inspect and Clean the Burner

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)

Re-Install the Burner

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.

At the burner flame entrance of each tube, shine a bright light into each heat ex- changer 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.

Instructions to Re-Install the Burner (Refer to FIGURE 23.)

1.Attach the Burner Assembly - Holding the venturi tube, slide the entire burner assembly into position. Align the supports on the bottom with the slots in the burner shield; sliding the supports into the slots. On the top, re-attach each burner body support to the burner shield.

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 34