Evacuation Hookup Diagram - Piper PA-44-180 SEMINOLE Maintenance Manual

988 COMPOUND GAUGE PULL 26 TO 28
VACUUM PUMP
OUT
NOTE
OPEN BOTH SERVICE VALVES
(COUNTERCLOCKWISE) ONE TURN
For each 1,000 feet of elevation above sea level, the compound gauge reading will be
about one inch lower, numerically.
1. Remove access panel at the rear of the cabin to gain access to the Schrader service valves.
DETERMINE THAT ALL SYSTEM PRESSURE IS RELEASED BEFORE
ATTEMPTING TO EVACUATE THE SYSTEM.
2. Connect the manifold gauge set to the airplane service valves. (Refer to Figure 21-28.)
3. The high and low manifold hand valves should be in the closed position.
(Refer to Figure 21-25 and 21-26.)
4. Connect the center manifold hose to the inlet of the vacuum pump.
Make sure the exhaust port on the vacuum pump is open to avoid damage to the
vacuum pump.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
INCHES VACUUM
PRESSURE GAUGE
OPEN
HIGH
LOW
OPEN
MANIFOLD GAUGE
SET
Figure 21-28. Evacuation Hookup
— Note —
— CAUTION —
— Note —
SCHRADER VALVE
HIGH
EVAPORATOR
ASSEMBLY
1H6
SCHRADER VALVE
LOW
2 1 - 5 2 - 0 7
Page 21-63
Revised: May 15, 1989