Cabin Vent System; Overhead Vent Blower; Removal Of Blower Assembly - Piper PA-44-180 SEMINOLE Maintenance Manual

CHART 2101. TROUBLESHOOTING (JANITROL HEATER) (cont)
Trouble
Heater starts then goes out,
(cont)
Heater fails to shut off.
DISTRIBUTION.

CABIN VENT SYSTEM.

OVERHEAD VENT BLOWER.

The blower is mounted in the aft section of the fuselage and is connected to the overhead vent system. The
blower draws air in from the dorsal fin or through the inlet located on the left side of the aft fuselage, depending
on serial number, and forces it through the ducting, whenever desired. The three position blower switch on the
instrument panel controls the two speed blower.

REMOVAL OF BLOWER ASSEMBLY.

1. Remove the access door from the aft wall of the baggage area.
2. With the master switch off, disconnect the plug assemblies at the blower assembly.
3. Remove the inlet and outlet hoses from the blower assembly by removing the clamps.
4. Remove the screws, washers and nuts that secure the blower assembly to the hanger braces.
5. Remove the screws and washers which secure the blower assembly to the retainer and hangers.
6. Remove the blower assembly from the aircraft.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Inoperative or chattering
combustion air pressure switch.
Inoperative overheat switch.
Inoperative cycling switch.
Low voltage.
Fuel solenoid valve in heater
stuck open.
Inoperative duct and cycling
switch.
Defective heater switch.
1E20
Remedy
Adjust or replace switch.
Replace switch.
Adjust or replace the switch.
Attach external power.
Remove and replace solenoid
assembly.
Check and repair.
Replace the heater switch.
Revised: May 15, 1989
2 1 - 2 1 - 0 2
Page 21-05