Global Power Technologies
SERVICE AND MAINTENANCE
05585 rev11 | Model 8550-SD
Page 28 of 53
5.4.3
CHANGING THE FUEL ORIFICE
To change the fuel orifice:
1.
Remove the fuel line and orifice assembly by
turning the orifice mounting base.
2.
Remove the orifice body from the assembly, see
3.
Check the orifice hole. It should be free and clean
of debris.
4.
Replace the orifice body if needed.
5.
Reassemble and check for leaks.
WARNING!
Check for leaks after performing any
fuel system service.
5.5
BURNER SYSTEM
The Burner System should be disassembled only if a problem with burner operation is suspected.
The Burner System consists of the following components:
The burner venturi and air shutter assembly which mixes combustion air and fuel.
The burner plate assembly where combustion takes place.
The exhaust stack assembly which collects and exhausts the exhaust gases.
Before disassembling the Burner System, remove the fuel orifice as per Section 6.4
and allow the
burner to cool. Once the burner has cooled down, identify and locate the components from Figure 15
proceed with disassembly as follows:
1.
Remove the venturi and air shutter assembly from the burner plate by turning the venturi, which
is threaded into the burner plate assembly,
counterclockwise
.
2.
Remove the air shutter from the venturi by closing the air shutter completely and removing the
four screws located in the openings on the air shutter plate.
3.
Remove the burner plate assembly by removing the four Burner Plate mounting screws then
pulling the burner plate assembly down, out of the Power Unit.
Perform the following checks once the Burner System has been disassembled:
1.
Check the air shutter assembly and venturi for corrosion or obstructions.
2.
Check the flame holder screen, located in the venturi mounting fitting on the burner plate
assembly, and the burner mantle for corrosion or obstructions.
If these parts are obstructed, clean them with a stiff wire brush.
If they are corroded, the burner must be repaired or replaced.
Figure 14 – Orifice Assembly Removal