Combustion Air Blower; 13-51. Standpipe And Preheat Resistor; Igniter; Combustion Air Motor - Piper TWIN COMANCHE PA-30 Service Manual

PIPER TWIN COMANCHE SERVICE MANUAL
13-50. COMBUSTION AIR BLOWER.
a.
Loosen the clamp (55) which attaches the combustion air elbow (56) and
thermal fuse (57). Disconnect wires from the thermal fuse (if used) and then
work the two parts off the blower outlet and heat exchanger inlet. Separate parts
after removal.
b.
Remove the cover (59) of the combustion air blower, by removing the nine
screws (60) and speed nuts (61). It is not necessary to remove the bracket (62),
or screws (63) unless replacement is required.
c.
Loosen the set screw in thehubof the blower wheel(64) and slide the wheel
off the motor shaft.
13-51. STANDPIPE AND PREHEAT RESISTOR.
a.
Remove the two screws (68) from the fuel line flange(65) and tapping plate
(66). Remove the two plates and the gasket (67).
b. Disconnect preheater connector strip from the igniter (79) and loosen the
large hex nut (70) on the bottom of the standpipe (69), one or two turns. Remove
the standpipe by backing off the smaller hex, which is welded to the pipe. When
the threads are clear, the standpipe (69) and preheat resistor (73) can be lifted
out through the opening in the heater housing.
c.
Remove the preheat resistor
(73) from the standpipe and pull out the knit
cable (72). Discard the cable and the "O" ring (71). These parts must be re-
placed at each overhaul.
13-52. IGNITER.
a. Remove the nut (74) and lockwasher (75) from the ground stud inside the
heater housing, to free the igniter ground strap (76), then remove the screw (77)
and lockwasher (78) to free the igniter ground wire.
b. Remove the igniter (79), using a 13/16 inch deep socket, and remove and
discard the igniter gasket (81).
13-53.
COMBUSTION AIR MOTOR.
a. To remove the combustion air motor, it is necessary to first remove the
combustion air elbows, the blower housing cover, the blower wheel, the stand-
pipe, and the preheat resistor.
b. After removing the parts noted above, remove the three mounting screws
(83) and remove the motor (82) from inside the housing. This will also free the
blower housing.
HEATING AND VENTILATING
Issued: 12/29/72
4B14