Expansion Valve Removal; Expansion Valve Installation - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
2612
TO EVAPORATOR
VALVE ASS'Y
CAPILLARY COIL
FROM RECEIVER
DEHYDRATOR
Figure 14-41. Expansion Valve (Typical)
14-119. EXPANSION VALVE.
14-120. EXPANSION
VALVE REMOVAL. (Refer to Figure 14-41.) This air conditioning system is
equipped with two evaporator units: each unit has an expansion valve mounted on the inboard side of the
module. The evaporator units are located in the cabin area aft of the divider panel beneath the second and
third seats.
a. Remove the seat(s) from the airplane.
b. Remove the appropriate cabin divider panel.
c. Remove the seat tracks and carpet from the floorboard panel.
d. Remove the screws securing the floorboard panel over the unit and remove the panel.
e. Discharge the system (Refer to paragraph 14-101) prior to loosening any fittings.
f. Remove the tape covering the pressure line, capillary tube and clamp. Remove the clamp. (Do
not kink the capillary tube.)
g. Loosen and separate related tube fittings (heat fittings to approximately 400 degrees to loosen).
Cap all tube ends to prevent contamination of the system.
NOTE
This part is not serviceable.
14-121. EXPANSION VALVE INSTALLATION. (Refer to Figure 14-41.)
a.
Install the expansion valve to the evaporator core, seal all tube connections with Loctite
refrigerant sealant (applied to tube flanges only). Couple the fitting and torque in accordance with Table
XIV-X.
b. Secure the capillary tube to the evaporator outlet line (with the clamp provided). Cover capillary
tube, clamp and outlet line with Presstite insulating tape (or equivalent).
Reissued:
9/23/80
4 H14
ACCESSORIES AND UTILITIES