Subaru 1600 Service Manual page 567

HEATING, VENTILATING AND AIR-CONDITIONING SYSTEM
CAUTION:
Protect fingers with cloth against
frostbite by refrigerant when connect-
ing the charging hose to the service
valve or disconnecting it therefrom.
Evacuating system
1) Connect high- and low-pressure
charging hoses of manifold gauge to
their respective service valves of sys-
tem and discharge refrigerant from
system. Refer to "Discharge System".
2) When refrigerant has been dis-
charged to a pressure approaching at-
mospheric pressure, connect center
charging hose to a vacuum pump.
3) Close both valves of manifold
gauge fully. Then start vacuum pump.
4) Open low-pressure valve and suck
old refrigerant from system.
5) When low-pressure gauge reading
has reached to approximately 66.7 kPa
(500 mmHg, 19.69 inHg), slowly open
high-pressure valve.
6) When pressure inside system has
dropped to 94.6 kPa (710 mmHg,
27.95 inHg) , fully close both of valves
of manifold gauge and stop vacuum
pump. Let stand it for 5 to 10 minutes
in this state and confirm that the
reading does not rise.
Evacuating system - First step
Fig. 13-55
NOTE:
a. The low-pressure gauge reads lower
by
3.3
kPa
(25
mmHg,
0.98
inHg)
per a
300
m
(1,000
ft) elevation.
Perform evacuation according to
the following table.
Elevation Vacuum of system
m (ft) kPa (mm Hg, in Hg)
0
(0)
94.6 (710, 27 .95)
300 (1,000) 91.3 (685, 26.97)
600 (2,000) 88.0 (660, 25.98)
900 (3,000) 84.6 (635,25.00)
NOTE:
Values show readings of the low-
pressure gauge.
b. The rate of ascension of the low-
pressure gauge should
be
less than
3.3
kPa
(25
mmHg,
0.98
inHg) in
five minutes.
If the pressure rises or the specified
negative pressure can not be obtained,
there is a leak in the system. In this
case, immediately charge system with
from vacuum pump.
(2) Connect center hose to can tap
in place of vacuum pump. Attach
refrigerant can to can tap and pass
refrigerant to manifold gauge.
(3) Loosen the connection of center
fitting of manifold gauge to purge air
from center hose.
(4) Open low-pressure valve of mani-
fold gauge and charge refrigerant into
system. After one can [about 0.4 kg
(0.9Ib)] of refrigerant has been
charged into system, close low-pres-
sure valve.
(5) Check for refrigerant leakage with
a leak detector. Repair any leakages
found. Refer to "Checking for Leaks"
and "Refrigerant Leaks".
(6) Confirm that both valves of
manifold gauge are fully closed and
then change center charging hose from
can tap to vacuum pump.
(7) Open high- and low-pressure
valves and operate vacuum pump to
such refrigerant from system. When
the pressure in system has dropped to
94.6 kPa (710 mmHg, 27.95 inHg),
fully close both valves of manifold
refrigerant and repair the leak de- gauge.
scribed in the followings. 7) The above operation completes
(1)
Confirm that both valves of evacuation of system. Next, charge
manifold gauge are fully closed and refrigerant. Refer to "Charging Refrig-
then disconnect center charging hose erant".
Evacuating system - Second step
A26'()33 A26·034
Fig. 13-56
13-22
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