THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 28
Jun 1/03
2D16
21-50-00
(e) With the engine operating at 1,000 to 1,500 rpm, the gauges should indicate as shown in
Chart 6.
(f) Once the charge is properly established, stop the engine, close the refrigerant container
service valve. Remove the manifold set and replace all protective caps and covers.
CHART 6
AMBIENT TEMPERATURE INDICATION
(6) Adding Partial Charge to System
The system can be topped off with refrigerant by the following method:
(a) Remove the closeout panel at the rear of the cabin.
(b) Connect a charging hose to a refrigerant cylinder and also to the low pressure Schrader
valve fitting on the manifold assembly.
(c) Purge the charging hose by allowing a small amount of refrigerant gas to escape at the
Schrader valve fitting.
CAUTION: ASCERTAIN THAT THE AREA AROUND THE AIRPLANE IS CLEAR AND
THAT A QUALIFIED PERSON IS AT THE CONTROLS OF THE AIRPLANE.
NOTE: Head the airplane into the wind during this procedure.
(d) Start the engine, operate at 1000 rpm and turn the air conditioner on maximum cool.
(e) Remove the plastic plug (if installed) from the sight glass in top of the receiver-dehydrator.
(f) With a low refrigerant charge in the system, bubbles will be seen passing through the
sight glass when the system is operating.
(g) Open the valve on the refrigerant cylinder.
(h) Allow refrigerant to flow into the system until the bubbles disappear from the sight glass.
(i) Close the refrigerant valve and check to see that the sight glass remains clear during
system operation.
(j) When the sight glass stays clear of bubbles, add an additional pound of refrigerant to the
system. (Engine should be operating at 1,000 rpm.)
NO
TE: This is done with OAT at 70°F, or higher, with the air conditioner operating.
(k) Shut off the air conditioner and engine. Remove the charging hose from the Schrader
valve with care due to refrigerant remaining in the line.
(l) Reinstall closeout panel.
AMBIENT GAUGE
GAUGE TEMPERATURE INDICATION
Low Pressure All 10 to 35 psig
High Pressure Up thru 75°F 125 psig min to 175 psig max
High Pressure Over 75°F 150 psig min to 275 psig max
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