Piper Cherokee Six - Page 686

PIPER CHEROKEE
SIX SERVICE
MANUAL
13-11. LEAK
CHECK -
METHOD II.
a. Remove
the access panel
at the rear of the
cabin to gain access
to the service valves.
b. Remove
the protective
cap on the high pressure
Schrader valve
fitting and connect
a
charging
hose with a
shut-off valve arrangement
to the fitting.
The charging hose
must have
a Schrader fitting
or adapter to
fit the valve.
c.
Connect the other
end of the charging
hose to a small
cylinder of refrigerant
and
purge the hose
by allowing a slight amount of refrigerant
gas to escape from the Schrader
valve fitting.
d. The cylinder of refrigerant should
be placed upright in a container
of warm (125
°
F
max.) water
on a small
scale.
e. Allow
approximately 1/2
pound of refrigerant
to enter the
system by opening
the
valve on the charging hose and observing the weight change on the scale.
f.
Using an electronic
leak detector,
check all joints
and repair
any leaks.
g.
After completion of repair of any leaks,
proceed to check the system in
accordance
with one of the
methods outlined for
any other leaks.
h. If no further repair
is required on the system, it is now
ready to evacuate in
accordance with paragraph 13-13.
13-12. DISCHARGING.
(Required only
if system contains
refrigerant.)
NOTE
Applies to Kent
Moore J23500 or similar
charging station.
Refer to Figure 13-7.
a. Close all valves on charging station.
b. Connect red
high pressure charging
line to high
pressure Schrader
valve at the
evaporator fitting.
c. Open
valve (high
pressure control)
on charging
station one turn.
d.
Hold end of blue
low pressure charging
line in a shop
rag and slowly open
valve (low\
pressure
control)
on charging
station allowing
refrigerant
to exhaust
from system
into shop
rag.
CAUTION
Refrigerant
can cause
freezing
of skin. Be
particularly careful
not to allow contact
with the
eyes.
Do not
allow refrigerant to escape
too rapidly, as excessive
oil may
be carried
out of system.
When hissing
stops, system
is empty
and valve should be closed
if no further work
is
planned.
ACCESSORIES
AND UTILITIES
Revised:
8/3/81
3G20