Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 354 / 1956

PAGE 36
Feb 28/07
2F4
21-50-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
M. Receiver - Dehydrator
The receiver-dehydrator is located beneath the floor on the left hand side. It is aft of the left
evaporator module. The receiver-dehydrator is mounted to the aft side of the frame at F.S. 241.50.
The receiver-dehydrator should be replaced if the air conditioning system has been operating with a
leak that would have allowed air to enter the system if the receiver-dehydrator is left open to the
atmosphere, it should be replaced due to the loss of effectiveness of the drying compound it
contains.
(1) Removal
(a) Discharge the system into an appropriate, environmentally-approved, refrigerant recovery
station.
(b) Remove the two refrigerant lines that connect to the top of the receiver-dehydrator. Cap
the lines.
(c) In S/N’s 4636187 and up, disconnect wiring to receiver-dehydrator mounted pressure
switches.
(d) Loosen the two clamps that secure the receiver-dehydrator and lift the receiver-dehydrator
from its mount.
(2) Installation
(a) Place the receiver-dehydrator in its mount.
(b) Connect the two refrigerant lines to the top of the receiver-dehydrator.
(c) Secure the receiver-dehydrator to its mount by tightening the two clamps around the
receiver-hydrator body.
(d) In S/N’s 4636187 and up, connect wiring to receiver-dehydrator mounted pressure
switches.
(e) Service the air conditioning system.
N. Manifold Assembly
The manifold assembly is located behind the receiver-dehydrator and is mounted to the forward
face of the frame at F.S. 249.60.
The manifold assembly has the high pressure switch screwed into the high pressure port that goes
through the manifold body and the low pressure switch screwed into the low pressure port that
passes through the manifold body.
Two service valves are located on the top side of the manifold body. These service valves, and not
the compressor mounted service valve, should be used for any hook ups when servicing the
system. See Service Valves, above.
(1) Removal
(a) Discharge the air conditioning system into an appropriate, environmentally-approved,
refrigerant recovery station.
(b) Disconnect the four refrigerant lines that go to the manifold assembly.
(c) In S/N’s 4636001 thru 4636186 only, disconnect wiring to manifold-mounted pressure
switches.
(d) Remove the two screws that secure the manifold to its mounting bracket and remove the
manifold assembly.