Power and Logic Wiring Harnesses (continued)
Remove Top Cover (ref. 5.1.1)
Remove Top Shell (ref. 5.1.2)
Remove Bottom Shell (ref. 5.1.3)
Remove Vent Fan Assembly (ref. 5.2.1)
Remove Combustor Assembly (ref. 5.3.1)
Using a 7/16" open ended wrench, remove the Exhaust Sensor from the Exhaust Port.
Detach Logic Wiring Harness connector (J5) from the Vent Sensor.
Note: The Vent Sensor connector has a self locking tab, that needs to be lifted to
allow the two halves of the connector to come apart.
Using pliers, release the 1" metal spring clamp at the Secondary Air Duct from the Heat Exchanger end. Slide
the spring clamp over the hose and release onto the Top Housing end so that the Secondary Air Duct and two
spring damps are attached to Top Housing. Be careful that the spring clamp does NOT damage the Secondary
DO NOT set the Top Housing on the Secondary Air Duct Hoses. Place the Top
Housing on its side with the fuel inlet fitting facing upwards:
Using a #2 cross-tip screwdriver, remove the four (4) screws which hold the Top Housing to the Heat Exchanger
Lift the Top Housing away from the Heat Exchanger.
Remove Power Wiring Harness connectors from the Fuel Injector (J5), (rotate the Injector upwards to release
the connector), the Fuel Pump (J4), and the Burner Fan Driver Board (J3).
Using a #1 cross-tip screwdriver, unscrew the two (2) screws which hold the MS Power connector (J2) to the
Top Housing. Using a screwdriver, remove the bolt holding down the Inductor (L1) clamp to the Burner Fan
Plate. Using a screwdriver, loosen the bolt found on the side of the Main Capacitor (C2) clamp. Free the
Capacitor and push the MS Power connector to the inside of the Top Housing.
Remove Logic Harness connectors from the Diagnostic Display (J2) and the Fuel Pressure Sensor (J4).
With the Top Housing on its side, use a #2 cross-tip screwdriver to remove the screws holding the Power and
Logic P-clips attached to the underside of the Top Housing.
Using a #1 cross-tip screwdriver, remove two (2) screws (on the inside face of the Top Housing) holding Resistor
(R1) to the underside of the Top Housing.
Remove the Fuel Pump (ref. 5.5.3) to allow access to Wiring Harness Plate.
Using a #2 cross-Up screwdriver, remove the four (4) self tapping screws from the Wiring Harness feed-thru
plate by which it is fastened to the Top Housing. Remove the Plate.
Remove Wiring Harnesses from Wiring Harness Plate by sliding grommets out of keyed slot in Wiring Harness
Remove Wiring Harnesses by sliding them up through the Top Housing.