Form I-RA/D 350/500, P/N 131090R12, Page 29
Inspecting Model
RA/RAD 500
Model RA/RAD 500 - To determine need for cleaning, inspect the heat
exchanger tubes through the smaller access door on the end of the heater
opposite the burner (the turning box end).
• Turn the four outer door latches 1/4 turn.
• Remove the door panel by lifting upward and outward on the
door handle
• Using a 1/2” wrench, remove the nuts and washers from the left
turning box door. Swing open the door.
• Shine a ashlight into the heat exchanger. As little as 1/16” ash
build-up on the internal tube surfaces can dramatically decrease
the thermal efciency of this heater. If the ash build-up is over
1/16”, proceed with the cleaning.
NOTE: You cannot adequately make this determination through the ame
observation door. The majority of the settlement of ash accumulates in
the heat exchanger tubes.
Inspect Heat
Exchanger
Tubes
Combustion Chamber
View with Both
Hinged Turning
Box Doors Open
View with Outer Doors Removed
Remove smaller
access panel
to inspect heat
exchanger tubes.
Maintenance
Continued
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