Reznor OH Unit Installation Manual - Manual (Page 22)

Form I-OH, PN 120390 R5, Page 22
FIGURE 25 - Combustion Chamber
and Heat Exchanger Passages
3/8” Nut to match Rod
3/8” Nut to match Rod
Rake
3/8” Threaded Rod
FIGURE 26 - Attach threaded rod to metal
piece provided to make a heat exchanger
cleaning "rake"
9.2.2 Removing Burner and Cleaning End Cone
Burner Removal
1) Remove three nuts attaching
burner mounting plate.
2) Slide burner tube out and rotate.
3) Use service tray to support burner.
Burner Mounting Plate (Replace
gasket if deteriorated.)
FIGURE 27 - Burner
End of Heater and
Burner Removal
Instructions
9. Maintenance and Service (cont'd)
9.2 Maintenance
Procedures
(cont'd)
WARNING: Turn off
the electric power
before burner
is removed for
service.
To gain access to the end cone, the burner must be removed.
1) Locate the two yellow wires that go from the burner to the ignition controller. Dis-
connect these wires at the terminals on the ignition controller.
2) Remove the three nuts that retain the burner to the heater. See FIGURE 27. Slide
the burner off the bolts and rotate.
3) With the burner on the service tray, you can remove the screws that hold the end
cone to the burner tube. Clean the end cone using a stiff wire brush. Check the
end cone for deterioration and replace if deterioration exists.
4. Remove the nuts that hold the large inner cover. Pull the cover directly forward
off the welded studs, exposing the combustion chamber and heat exchanger pas-
sages. Remove the woven gasket material. See FIGURE 25.
5. Scrape the soot from the combustion chamber walls and the passages of the heat
exchanger. Use a furnace brush and/or fabricate a "rake" from the 3/4" x 6" plate
furnished with the heater by attaching a 3/8" diameter threaded rod. Refer to FIG-
URE 26 for details on assembling "rake". A shop vacuum may be used to aid in the
cleaning process.
6. To clean the flue pipe, remove the cleanout cap from the tee. Tap the pipe gently
to cause any loose soot that may be out of reach to fall out. Scrape the flue pipe
walls that are accessible.
7. After the cleaning operation is completed, replace all covers being careful that gas-
kets are in place. If gaskets are damaged or deteriorated, they must be replaced.