Bock Water heaters OT300-A Installation And Operation Instruction Manual page 41

SECTION VI: MAINTENANCE (cont.)
INSPECT THE VENTING SYSTEM AND BURNER (cont.)
With the blower disassembled from the burner assembly, lift the burner straight up and
through the burner assembly mounting flange. Carefully set aside all gaskets when
disassembling the burner assembly. The gaskets must be used when reassembling.
Inspect the inside of the burner for blockage. The burner is comprised of a perforated stainless
steel tube with a woven metal wrapped around the outside. Do not attempt to stick objects
into the woven metal for cleaning purposes. This may damage the burner and reduce
performance. If blockage cannot easily be removed from inside the burner, compressed air
may be used to blow out any buildup.
Reassemble the burner, carefully placing all gaskets back to their original locations. Remount
the blower assembly to the mounting flange with the nuts and lock washers. Reconnect the
gas control to the flange with the four screws and reattach the air intake piping to the blower.
Finally, reinstall the ignitor and flame rod. Connect the wiring harnesses to the blower.
Restore power to the water heater and visually inspect the burner ignition through the sight
glass at the front of the mounting flange. When the system is working properly, ignition
should be smooth with an even flame distribution along the surface of the burner. The flames
should be short and blue with some yellow at the tips.
Figure 31: Removing the blower for burner inspection
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