Reassembly (45,000 Btu); (45,000 Btu) 2L5; General Information - Piper SENECA II Service Manual

PIPER SENECA II SERVICE MANUAL
r. Center the fuel fitting in jacket opening. Position the fuel fitting shroud gasket (29), washer (41)
and shroud (9); then install the nut (38) finger tight. Insert a 3/4 inch open-end wrench inside the jacket
and hold the fuel-tube fitting while tightening the nut (38) with a 3/4 inch deep socket. Install the fuel
solenoid elbow (34) and solenoid (22). Avoid twisting or damaging lead. Install wires through grommet in
lower shroud (9). ·
s. Rotate the combustion
air
switch (26) onto the threaded fitting on the combustion air tube and
tighten it firmly.
t. Install grommet (47} over pressure switch line. Connect the tube to the elbow fitting (33) on the
combustion air pressure switch (26).
u. Install the wiring harness and connect all wire leads to their respective terminals. (Refer to the
wiring diagram, Figure 13-7.) Place the grommet (45, Figure 13-19) in position in the jacket (5); locate the
ventilating air blower ( 11) at the end of the jacket. Thread the quick-disconnect on the motor leads through
the grommet and connect it to the mating connector on the wiring harness.
v. Place the blower housing in position on the jacket assembly (5) and secure it by installing the
four screws (20), if removed at disassembly. This operation is easier if the screws (20) are started into their
threads and the blower housing rotated into place allowing the screws to enter the notched openings in edge
of blower housing. Tighten all screws securely.
w. Install the elbow adapter (23) with the screw.
x. After heater is installed in the aircraft and the fuel line is connected, install the upper fuel shroud
box ( 10) with the screws. Ascertain that the grommet ( 40) is installed.
13-68. REASSEMBLY OF COMBUSTION AIR BLOWER ASSEMBLY (45,000 BTU). (Refer to Figure
13-21.)
a. Place the spacer (15) over the end of the motor shaft and attach the motor assembly (5) to the
inner housing (8) with the two self-locking nuts ( 17), flat washers ( 16) and lock washers (00).
b. Slide the blower wheel (7) on the motor shaft and tighten the set screw (6) lightly against the flat
portion of the motor shaft.
c. Place the outer blower housing (3) in position on the inner housing (8) and install screws ( 18).
d. Attach the radio-noise filter ( 10) at the point shown with the screw. The motor ground lead
terminal can be grounded to the motor support bracket ( 13).
e. Loosen the Allen-head set screw in the blower wheel (7) and shift the wheel on the motor shaft
until it is near the inlet in the blower housing. Tighten the set screw securely. The blower wheel should just
clear the inlet flange when rotated at full RPM. Spin the blower wheel by hand for clearance check; then
apply proper voltage to run motor and recheck for proper clearance.
f. Attach the blower inlet adapter (2) to blower housing (3) with screw ( 18).
13-69. TEST PROCEDURE.
13-70. GENERAL INFORMATION. A test of all components should have been made after overhaul to
insure proper operation. Some shops may not have complete testing facilities for measuring airflows,
pressure drops, and other factors which would be accomplished in a laboratory-type test. If such a test
cannot be made, install the heater and check operation on the ground and in the
air
to determine if
operation is normal. In shops where complete test equipment is available and a complete functional test can
be performed, the test routine described in subsequent paragraphs should be made.
Reissued: 10/11/79
HEATING AND VENTILATING SYSTEM
2L5