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

Page: 338 / 1956

PAGE 20
Feb 28/07
2E12
21-50-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(4) Charging the System
NOTE: The following assumes the charging stand is already connected to the airplane as
described in Evacuating the System, above.
NOTE: A Post Charging Operational Check is required immediately upon completion of
charging. Accordingly, choose a location where engine run-up is allowed and set up
the airplane and the charging stand with the airplane headed into the wind.
(a) Using a Kent Moore J23500 or similar charging stand (see Figures 4 and 5).
Ensure aircraft power is OFF before beginning.
1 Open the valve at the base of the charging cylinder and fill the charging cylinder with
sufficient refrigerant to charge the system. If refrigerant stops filling the cylinder, open
the bleed valve at the top of the charging cylinder to relieve head pressure and allow
refrigerant to continue filling the charging cylinder.
2 Close the bleed valve and the valve at the base of the charging cylinder.
3 Turn the charging cylinder sight glass to match the pressure reading on the charging
cylinder pressure gauge. Keep the sight glass in this position during the remainder of
the charging operation.
4 Connect the heating element plug to a 110 volt power outlet.
5 With the low pressure control valve (3) closed, open the refrigerant control valve (11)
and the high pressure control valve (10).
6 Allow the correct amount of refrigerant to enter the high side of the system.
7 Close the high pressure control valve (10) and the refrigerant control valve (11).
8 Perform Post Charging Operational Check, below.
(b) Using a Robinair 34700 charging station or equivalent (See Figures 3 and 6.)
CAUTION: THE FOLLOWING PROCEDURE APPLIES TO ROBINAIR 34700 OR
SIMILAR CHARGING STATION. SEE OPERATOR'S MANUAL OF
CHARGING STATION BEING USED, FOR DETAILED INSTRUCTIONS FOR
CHARGING SYSTEM.
1 Check that main power switch is OFF.
CAUTION: DO NOT PLACE ANY WEIGHT, INCLUDING HANDS AND/OR FEET,
ON REFRIGERANT TANK OR SCALE DURING CHARGING
PROCESS. ANY WEIGHT DISTURBANCE WILL CAUSE AN
INDIRECT TRANSFER OF REFRIGERANT.
2 Check that the LBS/KG selector switch on back of unit is in desired measurement
mode.
NOTE: You may enter the amount of refrigerant to be charged when the unit is
turned ON. The unit will store the amount in memory until it is turned off.
3 Open the low side (blue) valve on the unit's control panel.
4 If the messages PROGRAM and CHARGE do not display, press the CHG key to
enter the PROGRAM mode.
CAUTION: ADD REFRIGERANT THROUGH THE LOW PRESSURE SIDE ONLY.
NOTE: The amount of refrigerant required must be determined for each airplane. It
is the amount that will result in bubble-free operation at the system sight
gauge. 1.5 lbs. is the nominal amount of refrigerant for the PA-46-350P.
5 Enter amount of refrigerant required to charge the system by pressing the
appropriate number keys and ENTER on keypad.